1 Release 1.12.8 (2012-11-24 Chris Wilson <chris@chris-wilson.co.uk>)
2 ===================================================================
3 Another couple of weeks and a few more bugs have been found and fixed,
4 it is time to push the next point release. Many thanks to everyone who
5 reported their issues and helped us track down the bugs and helped
11 Expand the sanity checking for broken combinations of XSendEvent and
14 Notice that "The X.Org Foundation" sometimes also identifies itself
15 as "The Xorg Foundation".
17 Handle various ages of libXext and its Shm headers.
19 Fix the invalid clipping of the source drawable when using SHM
20 transport to upload images.
21 https://bugs.freedesktop.org/show_bug.cgi?id=56547
23 Handle all Type1 postscript operators for better font compatibility.
24 https://bugs.freedesktop.org/show_bug.cgi?id=56265
26 Fix a couple of memory leaks in Type1 font subsetting
27 https://bugs.freedesktop.org/show_bug.cgi?id=56566
29 Tighten the evaluation of the start/stop pen vertices, and catch a few
30 instances where we would use a fan instead of a bevel.
31 https://bugs.freedesktop.org/show_bug.cgi?id=56432
33 Fix assumption that geometric clipping always succeeds with the
35 https://bugs.freedesktop.org/show_bug.cgi?id=56574
37 Fix call to spline intersection when evaluating whether a stoke is
40 Remember to copy inferior sources when using SHM to readback the
41 surface for use as a source.
43 Release 1.12.6 (2012-10-22 Chris Wilson <chris@chris-wilson.co.uk>)
44 ===================================================================
45 Thanks to everyone who download cairo-1.12.4 and gave us their feedback.
46 It truly was invaluable and has helped us to fix many portability issues
47 that crept in with some of the new features. This release aims to fix
48 those stability issues and run on a wider range of systems.
53 Fix the recording surface to actually snapshot the source and so fix
56 Calling XSendEvent with an XShmCompletionEvent is incompatabile with
59 Reorder CloseDisplay chain so that XShm is not reinstantiated after
60 shutdown, causing a potential crash if the Display was immediately
61 recreated using the same memory address.
63 Make sure that the Xserver has attached to the SHM segment before
64 deleting it from the global namespace on systems that do not support
67 Type1 subsetting support for PDF (and PS) was once again improved to
68 work with a larger number of PDF readers.
70 GLESv2 build fixes and improved support for embedded GPUs.
72 Tweak the invisible pen detection for applications that are currently
73 using too large values for geometric tolerance.
75 A build fix for older freetype libraries.
78 Release 1.12.4 (2012-10-05 Chris Wilson <chris@chris-wilson.co.uk>)
79 ===================================================================
80 More bugs, and more importantly, more fixes. On the cairo-gl side, we
81 have refinements to the MSAA compositor which enables hardware
82 acceleration of comparitively low-quality antialiasing - which is useful
83 in animations and on very high density screens. For cairo-xlib, we have
84 finally enabled SHM transport for image transfers to and from the X
85 server. A long standing required feature, SHM transport offers a notable
86 reduction in rendering latency by reducing the number of copies
87 required to upload image data - given hardware and driver support,
88 cairo-xlib can now perform zero copy uploads onto the GPU. And as usual
89 Adrian Johnson has been very busy fixing many different corner cases in
90 cairo-pdf, impoving opacity groups and font subsetting. Last, but not
91 least, for cairo-image Søren Sandmann Pedersen added support for
92 rendering glyphs to pixman and using that from within cairo. The new
93 glyph rendering facility reduces the overhead for setting up the
94 compositing operation, improving glyph thoughput for the image backend
95 by a factor of about 4. And before he did so, he also fixed up a few
96 bugs in the existing glyph rendering code. So many thanks to Andrea
97 Canciani, Adrian Johnson, Chuanbo Weng, Dongyeon Kim, Henry Song, Martin
98 Robinson, Søren Sandmann Pedersen and Uli Schlachter for their
99 contributions, finding and fixing bugs.
104 Interior boxes were being dropped when amalgamating regions during
106 https://bugs.freedesktop.org/show_bug.cgi?id=49446
108 Allow building without gtk-doc installed
110 Invalid edge generation whilst reducing complex polygons.
111 https://bugs.freedesktop.org/show_bug.cgi?id=50852
113 Stroking around tight cusps
115 Use locale correct formats for reading font subsetting and valid
117 https://bugs.freedesktop.org/show_bug.cgi?id=51443
119 Ensure that the type1 subset includes all the glyph encodings
120 https://bugs.freedesktop.org/show_bug.cgi?id=53040
122 Upload the whole source for a repeating pattern.
123 https://bugs.freedesktop.org/show_bug.cgi?id=51910
125 Fix damage tracking to handle continuation chunks corectly and so
126 prevent crashes on win32.
127 https://bugs.freedesktop.org/show_bug.cgi?id=53384
129 Avoid emitting miter joins for degenerate line segments
130 https://bugzilla.mozilla.org/show_bug.cgi?id=407107
132 Convert the relative path semgents into the backend coordinates
133 and then back again to user coordinates (cairo_copy_path,
135 https://bugs.freedesktop.org/show_bug.cgi?id=54732
137 Fix extents computations for a degenerate path consisting only of a
139 https://bugs.freedesktop.org/show_bug.cgi?id=54549
141 Prevent crashing on a degenerate project edge after polygon
143 https://bugs.freedesktop.org/show_bug.cgi?id=54822
147 Release 1.12.2 (2012-04-29 Chris Wilson <chris@chris-wilson.co.uk>)
148 ===================================================================
149 After such a long gestation period for the release of Cairo 1.12, we
150 inevitably accumulated a few bugs that were flushed out by broadening the
151 test base. Thanks to everybody who tried the release, apologies to any one
152 unfortunate enough to encounter a bug and many thanks for reporting it. As
153 a result Adrian Johnson, Alexandros Frantzis, Andrea Canciani, Kalev
154 Lember, Maarten Bosman, Marcus Meissner, Nis Martensen and Uli Schlachter
155 have squashed many more bugs and improved the documentation. I would
156 strongly recommend everyone to upgrade to cairo-1.12.2.
162 Allow applications to create 0x0 xlib surfaces, such as used by LibreOffice.
163 https://bugs.freedesktop.org/show_bug.cgi?id=49118
165 Trim composite extents for SOURCE/CLEAR operators to the mask.
167 Use fallback fonts in PDF for unhandled computed glyph widths
168 https://bugs.freedesktop.org/show_bug.cgi?id=48349
170 Handle snapshots of recording surfaces for analysing pattern extents.
171 Fixes a regression of reporting the PDF bounding box as being the page size.
173 Fix allocation size for PDF pattern ids.
174 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49089
176 Fix emission of rectilinear dashed segments, with and without scaling, and
177 application of degenerate line joins.
179 Clamp unbounded fixup polygons to the clip extents.
181 Prevent infinite loop due to rounding errors whilst incrementing along dashes.
183 Prevent overflow for inline a8 span filling.
185 Miscellaneous build fixes for Cygwin on Windows and Solaris.
187 Release 1.12.0 (2012-03-23 Chris Wilson <chris@chris-wilson.co.uk>)
188 ===================================================================
189 It's taken over 18 months, but the wait is finally over. A new cairo release!
190 We are pleased to annouce a new stable release of Cairo that brings many
191 new features and performance improvements, all whilst maintaining
192 compatibility with cairo-1.0 and all releases since. We recommend anyone
193 using a previous release of Cairo to upgrade to 1.12.0.
195 The major feature of this release is the introduction of a new procedural
196 pattern; the mesh gradient. This, albeit complex, gradient is constructed
197 from a set of cubic Bezier patches and is a superset of all other gradient
198 surfaces which allows for the construction of incredibily detailed patterns.
199 In PDF parlance, the mesh gradient corresponds with type 7 patterns. Many
200 thanks to Andrea Canciani for bringing this to Cairo, and for his work on
201 making gradient handling robust.
203 Not content with just adding another procedural pattern, Cairo 1.12 also
204 adds new API to create a callback pattern,
205 cairo_pattern_create_raster_source, that allows the application to
206 provide the pixel data for the region of interest at the time of
207 rendering. This can be used for instance, by an application to decode
208 compressed images on demand and to keep a cache of those decompressed
209 images, independently of Cairo. When combined with the recording
210 surface, it should form a useful basis for a deferred renderer.
212 With the release of cairo-1.12, we also introduce a new supported
213 backend for interoperating with X using XCB. Uli Schlachter, also
214 maintainer of awesome and contributor to libxcb, has volunteered to
215 maintain cairo-xcb for us. Thanks Uli!
217 For cairo-1.12, we have also added some common API to address any
218 surface as an image and so allow direct modification of the raster data.
219 Previously, only the Quartz and Win32 backends supported a very narrow
220 interface to allow for efficient pixel upload. Now with
221 cairo_surface_create_similar_image, cairo_surface_map_to_image, and
222 cairo_surface_unmap_image, Cairo exports a consistent method for
223 treating those surfaces as an image and so allow modification inplace.
224 These are the same routines used internally, and should support
225 efficient transfer or direct mapping of the target surfaces as
228 Another focus over the past year has been to address many performance
229 issues, without sacrificing the composition model. To accomplish the
230 goal, once again the rasterisation pipeline was overhauled and made
231 explicit, giving the backends the freedom to implement their own
232 specific pipeline whilst also providing a library of common routines
233 from which to build the pipeline. For instance, this allows the image
234 backend and the gl backend to composite scan line primitives inplace,
235 and to then implement custom fallbacks to catch the corner cases that do
236 not map onto their fastest paths. Similarly, this allows for the Xlib
237 backend to implement trapezoidation without compromising the other
238 backends, yet still allow for the pipeline to be used elsewhere for
239 testing and fallbacks. Clipping was once again overhauled, so that the
240 common cases for the raster pipelines could be captured and processed
241 with fast paths with the emphasis on performing geometric clipping to
242 reduce the frequency of using multi-pass clipmasks. Stroking was made
243 faster, both by providing specialised fast-paths for simple, yet frequent,
244 cases (such as stroking around a rectangle) and by reducing the number
245 of edges generated by the general stroker.
247 As part of the focus on performance, Cairo 1.12 introduces some
248 antialias hints (NONE,FAST, GOOD, BEST) that are interpolated by the
249 raserisers to fine tune their performance versus quality. Cairo 1.12
250 also introduces a new observation architecture,
251 cairo_surface_observer_t, which can be used to analyse the amount of
252 time consumed by drawing commands and help identify inefficiencies in
253 both Cairo and the application.
255 Last, but by no means least, the OpenGL backend has seen significant
256 work including the port to GLESv2 and the exploitation of advanced
257 hardware features. Interesting times.
259 As always, I would like to thank everyone who contributed to Cairo,
260 not only through writing code, but also submitting documentation, bug
261 reports, suggestions and generally having fun with Cairo! In particular
262 though this release could not have happened without the efforts of
263 Adrian Johnson, Alexandros Frantiz, Andrea Canicani, Martin Robinson,
264 Nis Martensen, and Uli Schlachter. Thanks.
267 Snapshot 1.11.4 (2012-13-12)
268 ============================
269 The cairo community is pleased to finally announce the long aniticpated
270 release candidate for 1.12, 1.11.4, of the cairo graphics library. This
271 is the first major update to cairo in over a year and brings a large
272 number of new features; undoubtably a few bugs as well.
274 While many people have contributed and have helped to test the release,
275 providing feedback on 1.10 and suggesting improvements, this release
276 is the result of a few persevering souls who deserve recognition for their
277 outstanding contributions: Andrea Canciani (all round bug fixing,
278 performance tuning and master of the gradients), Adrian Johnson (PDF
279 supremo) and Uli Schlachter (who stepped forward as maintainer for the
282 Major additions since 1.11.2:
284 * cairo_surface_map_to_image API for pixel level access to any surface
286 * New antialias hints to control the trade-off between speed and quality
288 * A callback pattern, cairo_pattern_create_raster_source, for lazy
289 decoding of image data.
291 * cairo_surface_observer_t, a new type of surface to gather performance
294 * XCB as a supported backend
296 * A rewritten compositor pipeline for performance improvements for, but not
297 limited to, the xlib and image backends.
298 From ION and PineView through to SandyBridge, every machine I have shows
299 across the board performance improvement on the cairo-traces:
301 i5-2520m gnome-system-monitor: 5.97x speedup
302 pnv gnome-system-monitor: 4.86x speedup
303 i5-2520m firefox-asteroids: 4.66x speedup
304 pnv firefox-asteroids: 4.43x speedup
305 image firefox-canvas: 3.82x speedup
306 i5-2520m firefox-canvas-alpha: 3.49x speedup
307 image firefox-asteroids: 2.87x speedup
308 pnv firefox-talos-svg: 2.83x speedup
309 ion grads-heat-map: 2.75x speedup
310 pnv firefox-canvas-alpha: 2.66x speedup
311 image gnome-system-monitor: 2.66x speedup
312 image swfdec-giant-steps: 2.46x speedup
313 image firefox-canvas-alpha: 2.14x speedup
314 i5-2520m firefox-talos-svg: 2.03x speedup
315 image grads-heat-map: 2.02x speedup
316 ion gnome-system-monitor: 2.00x speedup
317 pnv firefox-particles: 1.99x speedup
318 i5-2520m grads-heat-map: 1.96x speedup
319 pnv firefox-canvas: 1.92x speedup
320 ion firefox-particles: 1.80x speedup
321 image poppler-reseau: 1.77x speedup
322 pnv xfce4-terminal-a1: 1.72x speedup
323 image firefox-talos-svg: 1.65x speedup
324 pnv grads-heat-map: 1.63x speedup
325 i5-2520m firefox-canvas: 1.63x speedup
326 pnv swfdec-youtube: 1.62x speedup
327 image ocitysmap: 1.59x speedup
328 i5-2520m firefox-fishbowl: 1.56x speedup
329 i5-2520m poppler-reseau: 1.50x speedup
330 i5-2520m evolution: 1.50x speedup
331 i5-2520m midori-zoomed: 1.43x speedup
332 pnv firefox-planet-gnome: 1.42x speedup
333 i5-2520m firefox-talos-gfx: 1.41x speedup
334 i5-2520m gvim: 1.41x speedup
335 pnv ocitysmap: 1.37x speedup
336 image poppler: 1.31x speedup
337 ion firefox-canvas-alpha: 1.35x speedup
338 ion firefox-talos-svg: 1.34x speedup
339 i5-2520m ocitysmap: 1.32x speedup
340 pnv poppler-reseau: 1.31x speedup
341 i5-2520m firefox-planet-gnome: 1.31x speedup
342 pnv firefox-fishbowl: 1.30x speedup
343 pnv evolution: 1.28x speedup
344 image gvim: 1.27x speedup
345 i5-2520m swfdec-youtube: 1.25x speedup
346 pnv gnome-terminal-vim: 1.27x speedup
347 pnv gvim: 1.25x speedup
348 image firefox-planet-gnome: 1.25x speedup
349 image swfdec-youtube: 1.25x speedup
352 And a plethora of minor improvements everywhere!
355 Snapshot 1.11.2 (2011-01-23)
356 ===========================
358 In this first snapshot along the way to cairo-1.12.0, we are very excited
359 to announce the introduction of Bezier surface gradients, known as type
360 6/7 gradients in PS/PDF parlance. This is the culmination of much work by
361 the dynamic duo: Adrian Johnson and Andrea Canciani. Thanks guys!
363 Also, I want to warmly welcome Uli Schlachter who recently joined the
364 Cairo community on a mission. That mission is to make cairo-xcb a
365 supported backend for 1.12. And for this snapshot he has made great
366 strides in fixing all the bugs I had left behind. Thanks Uli!
368 And we have also seen a new contributor, Alexandros Frantzis, who has
369 begun bringing up cairo-gl for GLESv2 devices. Thanks Alex!
371 And lastly, I must also thank Adrian and Andrea for the vast numbers of
372 bugs that they have tackled between them, fixing all those little corner
373 cases that lie hidden until too late.
377 The ability to construct piece-wise Bezier surface gradients:
379 cairo_pattern_create_mesh
381 constructs a pattern of type CAIRO_PATTERN_TYPE_MESH using
383 cairo_pattern_mesh_begin_patch
384 cairo_pattern_mesh_end_patch
385 cairo_pattern_mesh_curve_to
386 cairo_pattern_mesh_line_to
387 cairo_pattern_mesh_move_to
388 cairo_pattern_mesh_set_control_point
389 cairo_pattern_mesh_set_corner_color_rgb
390 cairo_pattern_mesh_set_corner_color_rgba
391 cairo_pattern_mesh_get_patch_count
392 cairo_pattern_mesh_get_path
393 cairo_pattern_mesh_get_corner_color_rgba
394 cairo_pattern_mesh_get_control_point
396 The introduction of a unique ID accessible via the mime data type:
397 CAIRO_MIME_TYPE_UNIQUE_ID
403 Release 1.10.2 (2010-12-25 Chris Wilson <chris@chris-wilson.co.uk>)
404 ===================================================================
405 The cairo community is pleased to announce the 1.10.2 release of the
406 cairo graphics library. This is the first update to cairo's stable 1.10
407 series and contains a large number of bug fixes.
409 While many people have contributed and have help to test the release,
410 2 people deserve special recognition for their efforts in tracking down
411 and fixing bugs, Andrea Canciani and Adrian Johnson. Thanks to their
412 tremendous efforts, and of all cairo contributors, it is much
415 We recommend everyone upgrade to cairo 1.10.2 and hope that everyone
416 will continue to have lots of fun with cairo!
423 Fix embedding of grayscale jpegs in PS.
424 https://bugs.freedesktop.org/show_bug.cgi?id=31632
426 Fix the reported path of extents containing a curve.
428 Fix the compositing of unaligned boxes.
430 Reset the clipper in PDF upon finish.
432 Fix degenerates arcs to become a degenerate line.
434 Build support for autoconf 2.67
436 Fix painting of transformed patterns in PS
438 Fix the EPS bounding box for PS
439 https://bugs.freedesktop.org/show_bug.cgi?id=24688
441 Fix the missing content for EPS
442 https://bugs.freedesktop.org/show_bug.cgi?id=24688
444 Fix regression upon changing page size in PS/PDF
445 https://bugs.freedesktop.org/show_bug.cgi?id=24691
447 Only use ActualText with PDF-1.5 documents
449 Fix the bbox for type1 fallbacks.
451 Reset the color after ending the context in PDF
452 https://bugs.freedesktop.org/show_bug.cgi?id=31140
454 Fix the advance of subsetted type1 fonts
455 https://bugs.freedesktop.org/show_bug.cgi?id=31062
457 Fix handling of EXTEND_NONE gradients for PDF
459 Restrict in-place optimisation for a8 image masks with SOURCE
462 Release 1.10.0 (2010-09-06 Chris Wilson <chris@chris-wilson.co.uk>)
463 ===================================================================
464 The cairo community is astounded (and flabbergast) to finally announce
465 the 1.10.0 release of the cairo graphics library. This is a major update
466 to cairo, with new features and enhanced functionality which maintains
467 compatibility for applications written using any previous major cairo
468 release, (1.8, 1.6, 1.4, 1.2, or 1.0). We recommend that anybody using
469 a previous version of cairo upgrade to cairo 1.10.0.
471 One of the more interesting departures for cairo for this release is the
472 inclusion of a tracing utility, cairo-trace. cairo-trace generates a
473 human-readable, replayable, compact representation of the sequences of
474 drawing commands made by an application. This can be used to inspecting
475 applications to understand issues and as a means for profiling
476 real-world usage of cairo.
478 The traces generated by cairo-trace have been collected in
480 git://git.cairographics.org/git/cairo-traces
482 and have driven the performance tuning of cairo over the last couple of
483 years. In particular, the image backend is much faster with a new
484 polygon rasterisation and a complete overhaul of the tessellator. Not
485 only is this faster, but also eliminates visual artifacts from
486 self-intersecting strokes. Not only has cairo-trace been driving
487 performance improvements within cairo, but as a repeatable means of
488 driving complex graphics it has been used to tune OpenGL, DDX, and
491 Cairo's API has been extended to better support printing, notably
492 through the ability to include a single compressed representation of an
493 image for patterns used throughout a document, leading to dramatic file
494 size reductions. Also the meta-surface used to record the vector
495 commands compromising a drawing sequence is now exposed as a
496 CAIRO_SURFACE_TYPE_RECORDING, along with a new surface that is a child of a
497 larger surface, CAIRO_SURFACE_TYPE_SUBSURFACE. One typical usage of a
498 subsurface would be as a source glyph in a texture atlas, or as a
499 restricted subwindow within a canvas.
501 Cairo's API has also resurrected the RGB16 format from the past as
502 the prevalence of 16-bit framebuffers has not diminished and is a
503 fore-taste of the extended format support we anticipate in the future.
504 Increasing cairo's utility, we introduce the cairo_region_t for handling
505 sets of pixel aligned rectangles commonly used in graphics applications.
506 This is a merger of the GdkRegion and the pixman_region_t, hopefully
507 providing the utility of the former with the speed of the latter.
509 Furthermore cairo has been reworked to interoperate more closely with
510 various acceleration architectures, gaining the ability to share
511 those hardware resources through the new cairo_device_t. For instance,
512 with the new OpenGL backend that supersedes the Glitz backend, hardware
513 and rendering operations can be shared between a classic OpenGL
514 application mixing libVA for the hardware assisted video decode with
515 cairo for high quality overlays all within the same OpenGL canvas.
517 Many thanks for the hard work of Adrian Johnson, Andrea Canciani, Behdad
518 Esfahbod, Benjamin Otte, Carl Worth, Carlos Garcia Campos, Chris Wilson,
519 Eric Anholt, Jeff Muizelaar, Karl Tomlinson, M Joonas Pihlaja, Søren
520 Sandmann Pedersen and many others that have contributed over the last
521 couple of years to cairo. Thank you all!
523 Snapshot 1.9.14 (2010-07-26)
524 ============================
526 A quiet couple of weeks, hopefully Cairo is seeing widescale deployment and
527 we are being to see the results of the stabilisation effort. Clipping bugs
528 seems to have been the order of the last couple of weeks, with a couple
529 reported and duly fixed. Thank you Igor Nikitin and Karl Tomlinsion for
530 finding those regressions. At this point all that seems to remain to do is
531 to fix the outstanding regressions in the PDF backend...
536 Clip doesn't work for text on the image backend
537 https://bugs.freedesktop.org/show_bug.cgi?id=29008
539 Add explicit dependency for cxx
540 https://bugs.freedesktop.org/show_bug.cgi?id=29114
542 Fix regressions in reporting clip extents
543 https://bugs.freedesktop.org/show_bug.cgi?id=29120
544 https://bugs.freedesktop.org/show_bug.cgi?id=29121
545 https://bugs.freedesktop.org/show_bug.cgi?id=29122
546 https://bugs.freedesktop.org/show_bug.cgi?id=29124
547 https://bugs.freedesktop.org/show_bug.cgi?id=29125
550 Snapshot 1.9.12 (2010-07-12)
551 ============================
553 A couple of weeks spent fixing those annoying bugs and cleaning up the build
554 system; the list of outstanding tasks to complete for the stable release is
555 finally shrinking. The chief bug fixer has been Benjamin Otte who not only
556 made sure that the public API is consistent and being tested for its
557 consistency, but also ensured that the documentation was up-to-date and
558 spent time clarifying cases where even the Cairo developers have come
559 unstuck in the past. Many thanks, Benjamin. However, he was not alone,
560 as Andrea Canciani continued his fine work in isolating broken corner cases
561 and proceeding to fix them, and tidying up the quartz backend. And last, but
562 definitely not least, M Joonas Pihlaja tried building Cairo across a
563 perverse range of systems and fixed up all the loose bits of code that came
564 unravelled. Thanks everybody!
569 cairo_surface_set_mime_data, cairo_surface_get_mime_data:
571 The length parameter is now an unsigned long (as opposed to an unsigned
572 int). The parameter is intended to be an equivalent to a size_t without
573 requiring POSIX types and be large enough to store the size of the
574 largest possible allocation.
576 cairo_gl_surface_create_for_texture:
578 This a new surface constructor for cairo-gl that explicitly enables
579 render-to-texture for foreign, i.e. application, textures.
581 cairo_region_xor, cairo_region_xor_rectangle
583 A couple of utility routines add to the region handling interface for
584 the purpose of replacing existing GdkRegion functionality.
589 https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/600622
591 Inkscape was caught in the act of attempting to modify a finished surface.
592 Unfortunately, we had the ordering of our guards and assertions wrong and
593 so an ordinary application error was triggering an assert in Cairo. This
594 lead Benjamin to add a test case to ensure that the entire public API
595 could handle erroneous input and then proceeded to fix a whole slew of
599 https://bugs.freedesktop.org/show_bug.cgi?id=28888
601 A regression introduced by the special casing of uploading images to an
602 xlib surface in-place which was ignoring the translation applied to the
606 Snapshot 1.9.10 (2010-06-26)
607 ============================
609 The first "quick" snapshot in the run up to the stable release. The
610 last snapshot was picked up by the bleeding edge distributions and so the
611 bug reports have to started to roll in. The most frequent of these are the
612 introduction of rendering errors by applications that modify a surface
613 without subsequently calling cairo_surface_mark_dirty(). Make sure the
614 application developers are aware of increased reliance on strict use of the
615 Cairo API before 1.10 is released!
617 The usual slew of bugs reported and we would like to thank Zoxc for
618 contributing the WGL interface for cairo-gl, and finding more build
619 failures on win32. And it just wouldn't be a 1.9 snapshot unless
620 Benjamin Otte improved the error handling within cairo-gl, as well as
621 isolating and fixing some more errors in the test suite. The biggest bug of
622 the snapshot turned out to be a major sign extension issue that had lain
623 hidden for many years and was suddenly exposed by incorrectly rounding
624 rectangles when performing non-antialiased rendering. Also to the relief
625 of many we have included the downstream patch to honour the user's LCD
626 filtering preferences for subpixel rendering of fonts. The interface
627 remains private for the time being, whilst the proposed public API is
634 Snapshot 1.9.8 (2010-06-12)
635 ===========================
637 One major API changes since the last snapshot, and a whole slew of bugs
638 fixed and inconsistencies eliminated. Far too many bugs fixed to
639 individually identify. We need to thank Benjamin Otte for his fantastic
640 work on the cairo-gl backend making it faster and more robust, Andrea
641 Canciani for finding so many bugs and developing test cases for them, as
642 well fixing them. And last but not least we must all thank Adrian Johnson for
643 continuing to eliminate bugs and improving the PostScript and PDF backends.
645 This snapshot represents almost 4 months of bug fixing, bringing Cairo to
646 a point where we consider it almost ready to be a candidate for release.
647 There are a few known bugs left to be fixed, being tracked in
648 https://bugs.freedesktop.org/show_bug.cgi?id=24384, so please give Cairo a
649 whirl and report any regressions. The plan is to release a new snapshot
650 every other week leading to a 1.10 release with a target date of
655 CAIRO_FORMAT_RGB16_565
657 16 bit devices still remain popular, and so with great demand,
658 CAIRO_FORMAT_RGB16_565 has been restored enabling applications to create
659 and use 16 bit images as sources and render targets.
661 cairo_surface_create_for_rectangle()
663 It is common practice to cut an image up into many smaller pieces and use
664 each of those as a source - a technique called texture atlasing.
665 cairo_surface_create_for_rectangle() extends Cairo to directly support use
666 of these subregions of another cairo_surface_t both as a source and as a
669 cairo_region_create()
670 cairo_region_create_rectangle()
671 cairo_region_create_rectangles()
673 cairo_region_reference()
674 cairo_region_destroy()
676 cairo_region_status()
677 cairo_region_get_extents()
678 cairo_region_num_rectangles()
679 cairo_region_get_rectangle()
680 cairo_region_is_empty()
681 cairo_region_contains_rectangle()
682 cairo_region_contains_point()
683 cairo_region_translate()
684 cairo_region_subtract()
685 cairo_region_subtract_rectangle()
686 cairo_region_intersect()
687 cairo_region_intersect_rectangle()
689 cairo_region_union_rectangle()
691 The Cairo region API was actually added a couple of snapshots ago, but we
692 forgot to mention it at the time. A simple API for the handling of
693 rectangular pixel-aligned regions by Soeren Sandmann.
696 Backend-specific improvements
697 -----------------------------
700 Benjamin Otte made more than 200 commits in which he refactored the cairo-gl
701 backend, reducing a lot of code duplication and enabled him to begin working
702 on improving performance by reducing state changes and associated overhead.
706 Access to the underlying connection to the Display is now thread-safe
707 enabling cairo-xlib to be used in a multi-threaded application without fear
708 of random corruption. Thanks Benjamin Otte!
710 cairo-xlib will now attempt to use PolyModeImprecise when compositing
711 trapezoids (i.e. a fill or a stroke operation with a non-trivial path) which
712 should allow hardware drivers more scope for accelerating the operation at
713 the cost of potentially incurring minute rendering errors. The mode can be
714 forced back to PolyModePrecise by setting the antialias parameter to
715 CAIRO_ANTIALIAS_SUBPIXEL.
719 A notable improvement was contributed by Alexander Shulgin to enable SVG to
720 reference external image through the use an extended MIME data type.
722 Snapshot 1.9.6 (2010-02-19)
723 ===========================
728 The device is a generic method for accessing the underlying interface
729 with the native graphics subsystem, typically the X connection or
730 perhaps the GL context. By exposing a cairo_device_t on a surface and
731 its various methods we enable finer control over interoperability with
732 external interactions of the device by applications. The use case in
733 mind is, for example, a multi-threaded gstreamer which needs to serialise
734 its own direct access to the device along with Cairo's across many
737 Secondly, the cairo_device_t is a unifying API for the mismash of
738 backend specific methods for controlling creation of surfaces with
739 explicit devices and a convenient hook for debugging and introspection.
741 The principal components of the API are the memory management of:
743 cairo_device_reference(),
744 cairo_device_finish() and
745 cairo_device_destroy();
747 along with a pair of routines for serialising interaction:
749 cairo_device_acquire() and
750 cairo_device_release()
752 and a method to flush any outstanding accesses:
754 cairo_device_flush().
756 The device for a particular surface may be retrieved using:
758 cairo_surface_get_device().
760 The device returned is owned by the surface.
762 API changes (to API new in the cairo 1.9.x series)
763 --------------------------------------------------
764 cairo_recording_surface_create()
765 cairo_recording_surface_ink_extents()
767 These are the replacement names for the functions previously named
768 cairo_meta_surface_create and cairo_meta_surface_ink_extents.
770 cairo_surface_set_mime_data
772 This interface is now changed such that the MIME data will be
773 detached if the surface is modified at all. This guarantees that
774 the MIME data will not become out of synch due to surface
775 modifications, and also means that for the MIME data to be useful,
776 it must be set after all modifications to the surface are
779 API removal (of experiment API)
780 -------------------------------
781 The cairo-glitz backend is removed entirely, (in favor of the new
782 cairo-gl backend). See below for more on cairo-gl.
787 Many improvements for drawing of dashed strokes
789 Fix incorrect handling of negative offset
790 Faster computation of first dash (avoids near-infinite looping)
791 Approximate extremely fine dash patterns with appropriate alpha value
793 Optimize spans-based renderers for repeated rows, (such as in a rounded rectangle)
795 Backend-specific improvements
796 -----------------------------
799 This is a new, direct-rendering backend that supports Intel graphics
800 chipsets in the i915 and i965 families. It's still experimental and
801 will likely remain that way for a while. It's already got extremely
802 good performance on the hardware it supports, so if nothing else
803 provides a working proof and performance target for the cairo-gl
804 work for Intel graphics.
808 Start using GLSL to accelerate many operations. Many thanks to Eric
809 Anholt and T. Zachary Laine for this work. For the first time, we
810 have what looks like what will be a very compelling OpenGL-based
811 backend for cairo (in terms of both quality and performance).
813 See this writeup from Eric for more details on recent progress of
814 cairo-gl (which he presented at FOSDEM 2010):
816 http://anholt.livejournal.com/42146.html
820 The image backend is made dramatically faster (3-5 times faster for
821 benchmarks consisting primarily of glyph rendering).
825 Many fixes from Robert O'Callahan and Andrea Canciani including:
827 Fixed gradient pattern painting
828 Improved A8 image handling
829 Fixes for "unbounded" and other compositing operators
833 Improvements to embedding of JPEG and JPEG2000 data.
837 Fix printing of rotated user fonts.
839 Snapshot 1.9.4 (2009-10-15)
840 ===========================
843 cairo_meta_surface_create()
844 cairo_meta_surface_ink_extents()
846 Finally exporting the internal meta-surface so that applications
847 have a method to record and replay a sequence of drawing commands.
851 Determines whether a given point is inside the current clip.
852 ??? Should this be called cairo_in_paint() instead? in-clip is the test
853 that is performed, but in-paint would be similar to in-fill and in-stroke.
859 A companion to cairo-perf-trace, this utility replays a trace against
860 multiple targets in parallel and looks for differences in the output,
861 and then records any drawing commands that cause a failure.
863 Further minimisation of the fail trace using "delta debugging".
864 More control over test/reference targets.
866 Backend improvements:
870 Server-side gradients. The theory is that we can offload computation
871 of gradients to the GPU and avoid pushing large images over the
872 connection. Even if the driver has to fallback and use pixman to render
873 a temporary source, it should be able to do so in a more efficient manner
874 than Cairo itself. However, cairo-perf suggests otherwise:
876 On tiny, Celeron/i915:
878 before: firefox-20090601 211.585
879 after: firefox-20090601 270.939
881 and on tiger, CoreDuo/nvidia:
883 before: firefox-20090601 70.143
884 after: firefox-20090601 87.326
886 In particular, looking at tiny:
888 xlib-rgba paint-with-alpha_linear-rgba_over-512 47.11 (47.16 0.05%) -> 123.42 (123.72 0.13%): 2.62x slowdown
890 xlib-rgba paint-with-alpha_linear3-rgba_over-512 47.27 (47.32 0.04%) -> 123.78 (124.04 0.13%): 2.62x slowdown
894 New experimental backends:
898 OpenVG - The initial work was done by Øyvind Kolås, and made ready for
899 inclusion by Pierre Tardy.
901 OpenGL - An advanced OpenGL compositor. The aim is to write a integrate
902 directed rendering using OpenGL at a high-level into Cairo. In
903 contrast to the previous attempt using Glitz which tried to
904 implement the RENDER protocol on top of OpenGL, using the
905 high-level interface should permit greater flexibility and
906 more offloading onto the GPU.
907 The initial work on the backend was performed by Eric Anholt.
909 Long standing bugs fixed:
911 Self-intersecting strokes.
913 A long standing bug where the coverage from overlapping semi-opaque
914 strokes (including neighbouring edges) was simply summed in lieu of
915 a costly global calculation has been fixed (by performing the costly
916 global calculation!) In order to mitigate the extra cost, the
917 tessellator has been overhauled and tune, which handles the fallback
918 for when we are unable to use the new span rasteriser on the stroke
919 (e.g. when using the current RENDER protocol). The large number of
920 pixel artefacts that implementing self-intersection elimination
921 removes is ample justification for the potential performance
922 regression. If you unfortunately do suffer a substantial performance
923 regression in your application, please consider obtaining a
924 cairo-trace and submitting it to us for analysis and inclusion into
925 our performance suite.
929 To the AuroraUX team for providing access to one of their OpenSolaris
930 machines for cairo and pixman development. http://www.auroraux.org/
932 Snapshot 1.9.2 (2009-06-12)
933 ===========================
936 cairo_surface_set_mime_data()
937 cairo_surface_get_mime_data()
939 Should this take unsigned int, unsigned long or size_t for the length
940 parameter? (Some datasets may be >4GiB in size.)
942 Associate an alternate, compressed, representation for a surface.
944 "image/jp2" (JPEG2000) is understood by PDF >= 1.5
945 "image/jpeg" is understood by PDF,PS,SVG,win32-printing.
946 "image/png" is understood by SVG.
949 cairo_pdf_surface_restrict_to_version()
950 cairo_pdf_get_versions()
951 cairo_pdf_version_to_string()
953 Similar to restrict to version and level found in SVG and PS,
954 these limit the features used in the output to comply with the PDF
955 specification for that version.
957 CAIRO_STATUS_INVALID_SIZE
958 Indicates that the request surface size is not supported by the
959 backend. This generally indicates that the request is too large.
961 CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED
962 Indicates that a required callback for a user-font was not implemented.
964 CAIRO_STATUS_LAST_STATUS
965 This is a special value to indicate the number of status values enumerated
966 at compile time. (This may differ to the number known at run-time.)
968 The built-in twin font is now called "@cairo:" and supports a limited set
969 of options like "@cairo:mono". Where are these specified?
971 cairo_in_fill() now uses HTML Canvas semantics, all edges are inside.
973 New experimental backends:
979 cairo-trace and cairo-perf-trace
981 cairo-trace generates a human-readable, replayable, compact(-ish!)
982 representation of the sequences of drawing commands made by an
985 Under the util/cairo-script directory is a library to replay traces.
987 perf/cairo-perf-trace replays traces against multiple backends
988 and makes useful benchmark reports. This is integrated with
989 'make perf'. You may collect your own traces or take advantage
990 of traces collected by the community:
992 git://git.cairographics.org/git/cairo-traces
994 (Put this into perf/cairo-traces to run these as part of "make perf".)
996 There is additional WIP in building a debugging tool for cairo applications
997 based on CairoScript (currently very preliminary, mostly serves to show
998 that GtkSourceView is too slow) :
1000 people.freedesktop.org:~ickle/sphinx
1002 Test suite overhaul:
1004 The test suite is undergoing an overhaul, primarily to improve its speed
1005 and utility. (Expect more changes in the near future to improve XFAIL
1009 polygon rasterisation! Joonas implemented the Tor polygon scan converter,
1010 on typical geometry is about 30% faster for the image backend.
1012 Bovine Polaroids! For those not in on the joke, this is the long
1013 awaited "copy-on-write snapshot" or "COW snapshot" support. The
1014 user-visible feature is that including the same image multiple times
1015 into a PDF file should result in only a single instance of that
1016 image in the final output. This is unlike previous versions of cairo
1017 which would generate very large PDF files with multiple copies of
1018 the same image. Adrian says that the PDF is not quite working as
1019 well as it should yet, so we hope for futher improvements before
1026 Better handling of large scale-factors on image patterns.
1028 Emit /Interpolate for PS,PDF images.
1030 Global glyph cache - cap on the total number of inactive glyphs,
1031 should prove fairer for fonts with larger glyph sets.
1033 Compilation without fontconfig
1035 Improved handling of low-bitdepth sources (e.g. copying the contents
1036 of 16-bit xserver windows)
1040 cairo_traps_extract_region >10x slower. Fix pending.
1044 Region tracking API (ssp) for damage tracking, hit testing etc
1047 An expiremental OpenGL backend?
1049 Tweaks to tessellator, allocations of patterns, delayed
1050 initialisation of the xlib backend (reduce the cairo overhead of
1051 render_bench by ~80%).
1054 Release 1.8.8 (2009-06-16 Chris Wilson <chris@chris-wilson.co.uk>)
1055 ==================================================================
1056 The cairo community is pleased to announce the 1.8.8 release of the
1057 cairo graphics library. This is the fourth update to cairo's stable
1058 1.8 series and contains a small number of bug fixes (in particular a
1059 few corrections to the documentation and a few fixes in the FreeType font
1060 backend). This is being released just over six months after cairo 1.8.6.
1062 We recommend that everyone using cairo upgrade to 1.8.8.
1068 There were reports of incompatibilities with the autotools bundled in with
1069 the 1.8.6 tarball. This release has been built with automake-1.10.2 and
1072 The configure check for FreeType has been improved:
1074 typo in check for version of freetype in configure script
1075 https://bugs.freedesktop.org/show_bug.cgi?id=19283
1077 Compilation on 64-bit MacOS/X fixes:
1079 Cannot build cairo_quartz_font_face_create_for_atsu_font_id on 64-bit Mac OS X
1080 https://bugs.freedesktop.org/show_bug.cgi?id=15702
1084 Uninitialised status return within _cairo_clip_intersect_mask(). This caused
1085 random crashes and general mayhem as an error could be generated causing all
1086 rendering to the context to stop.
1088 Avoid transforming nearly-degenerate matrices into degenerate matrices:
1090 Painting stops in this case, using -moz-transform: scale, rotate and video
1091 https://bugzilla.mozilla.org/show_bug.cgi?id=467423
1093 A few FreeType font handling bugs were fixed:
1095 Rendering with PANGO_GRAVITY_EAST leads to different results with image and pdf
1096 https://bugs.freedesktop.org/show_bug.cgi?id=21985
1098 Don't call FT_Done_Face() on faces we did not create
1100 zombie ft_font_face / ft_unscaled_font mutual referencing problems
1101 http://bugs.freedesktop.org/show_bug.cgi?id=21706
1103 Ensure win32 font backend sets the return value to -1 (indicating the absent
1104 glyph) if the font index lookup for the unicode character fails. And
1105 similarly fix a bug where a fatal error was raised for an invalid glyph.
1107 cairo_scaled_font_glyph_extents breaks with invalid glyph id
1108 http://bugs.freedesktop.org/show_bug.cgi?id=20255
1110 Various improvements to the documentation, reported by Truc Troung:
1112 https://bugs.freedesktop.org/show_bug.cgi?id=20095
1113 https://bugs.freedesktop.org/show_bug.cgi?id=20154
1114 https://bugs.freedesktop.org/show_bug.cgi?id=20180
1115 https://bugs.freedesktop.org/show_bug.cgi?id=20183
1116 https://bugs.freedesktop.org/show_bug.cgi?id=20182
1117 https://bugs.freedesktop.org/show_bug.cgi?id=20441
1120 Release 1.8.6 (2008-12-13 Chris Wilson <chris@chris-wilson.co.uk>)
1121 ==================================================================
1122 The cairo community is pleased to announce the 1.8.6 release of the
1123 cairo graphics library. This is the third update to cairo's stable
1124 1.8 series and contains a small number of bug fixes (in particular a
1125 few fixes for failures of cairo 1.8.4 on Quartz and PDF, and build fixes for
1126 a couple of backends). This is being released just under a month after
1129 We recommend that everyone using cairo upgrade to 1.8.6.
1135 Fix build of DirectFB backend with debugging enabled:
1137 Bug in _cairo_directfb_surface_release_source_image function
1138 http://bugs.freedesktop.org/show_bug.cgi?id=18322
1144 Workaround a mis-compilation of cairo_matrix_invert() that generated invalid
1145 matrices and triggered assertion failures later. The issue was reported by
1148 Invalid computation of the modulus:
1150 https://bugzilla.mozilla.org/show_bug.cgi?id=466258
1152 Invalid referencing of patterns in the Quartz backend:
1154 Failed assertion `CAIRO_REFERENCE_COUNT_HAS_REFERENCE
1155 (&pattern->ref_count)' when using cairo quartz backend
1156 http://bugs.freedesktop.org/show_bug.cgi?id=18632
1158 Invalid references to glyphs after early culling, causing segmentation faults
1161 http://lists.cairographics.org/archives/cairo/2008-December/015976.html
1163 Check for XRender in the XCB backend, or else we may attempt an invalid memory
1166 XCB backend fails with missing render.
1167 https://bugs.freedesktop.org/show_bug.cgi?id=18588
1169 Release 1.8.4 (2008-11-14 Carl Worth <cworth@cworth.org>)
1170 =========================================================
1171 The cairo community is pleased to announce the 1.8.4 release of the
1172 cairo graphics library. This is the second update to cairo's stable
1173 1.8 series and contains a small number of bug fixes, (in particular a
1174 few fixes for build failures of cairo 1.8.2 on various systems). This
1175 is being released just over two weeks after cairo 1.8.2.
1177 We recommend that everyone using cairo upgrade to 1.8.4.
1183 Fix build with older XRender that doesn't define RepeatNone:
1185 Build of xlib backend fails against old XRender (RepeatNone undeclared)
1186 https://bugs.freedesktop.org/show_bug.cgi?id=18385
1188 Fix build with bash version <= 3.0:
1190 doltlibtool broken on linux with bash 3.00.0
1191 https://bugs.freedesktop.org/show_bug.cgi?id=18363
1195 Avoid triggering a bug in X.org server 6.9 resulting in a hung machine
1198 https://bugs.freedesktop.org/show_bug.cgi?id=15628#c2
1200 Fix display of user fonts as exercised by proposed support for type3
1201 fonts in poppler (unsigned promotion fixes):
1203 Use cairo user-font for Type 3 fonts
1204 http://lists.freedesktop.org/archives/poppler/2008-October/004181.html
1206 Avoid miscomputing size of fallback images required when rendering
1207 with CLEAR, IN, or SOURCE operator to vector surfaces, (PS, PDF, SVG,
1210 Be more tolerant of broken fonts when subsetting type1 fonts:
1212 Error handling in cairo_type1_font_subset_get_glyph_names_and_widths
1213 http://lists.cairographics.org/archives/cairo/2008-October/015569.html
1215 Fix cairo_fill_extents, cairo_stroke_extents, cairo_path_extents, to
1216 correctly allow NULL parameters as documented.
1218 Fix potential crash on emitting a type3 glyph after having drawn text
1219 paths from the same font, (for example with cairo_text_path).
1221 Release 1.8.2 (2008-10-29 Carl Worth <cworth@cworth.org>)
1222 =========================================================
1223 The cairo community is pleased to announce the 1.8.2 release of the
1224 cairo graphics library. This is the first update to cairo's stable 1.8
1225 series and contains a large number of bug fixes. It is being released
1226 just over one month since cairo 1.8.0.
1228 This release consists primarily of bug fixes, but there is one notable
1229 new feature, (the ability to build cairo without an external font
1230 backend), and there are a few optimizations as well. See below for
1231 details on these changes and the most important bug fixes.
1233 While many people have contributed to this release, Chris Wilson
1234 deserves particular mention. He has contributed well over twice as
1235 many changes to cairo since 1.8.0 than everyone else combined. We
1236 greatly appreciate the tremendous efforts of Chris and all cairo
1239 We recommend everyone upgrade to cairo 1.8.2 and hope that everyone
1240 will have lots of fun with cairo!
1246 It is now possible to build cairo without any font backend, (such as
1247 freetype, win32 or quartz). This is most useful when the application
1248 provides custom font rendering through the user-font API. But in the
1249 case where no external font backend is available, and no user-font is
1250 provided, cairo will render with a failsafe font, (a stroked font
1251 covering visible ASCII character). (Behdad Esfahbod)
1255 Dramatically speed up compilation with dolt (removes much of the
1256 libtool overhead) (Behdad Esfahbod with thanks to Josh Triplett).
1258 Several minor optimizations to tessellator (special-cased comparisons,
1259 faster insert for skiplist, etc.) (Chris Wilson).
1261 Optimize away fractional translation component when doing
1262 EXTEND_NEAREST filtering, (for better performance).
1266 Allow cloning sub-regions of similar surfaces to fix this bug
1269 Crafted gif file will crash firefox
1270 [XError: 'BadAlloc (insufficient resources for operation)']
1271 https://bugzilla.mozilla.org/show_bug.cgi?id=424333
1273 Fix some matrix confusion to fix this regression (Chris Wilson):
1275 Translucent star exports in a wrong way to PDF
1276 https://bugs.launchpad.net/inkscape/+bug/234546
1278 Fix some long-standing bugs with respect to properly computing the
1279 extents of transformed, filtered surfaces (Owen Taylor, Carl Worth,
1282 Bad clipping with EXTEND_NONE
1283 http://bugs.freedesktop.org/show_bug.cgi?id=15349
1285 Improve filtering handling in cairo-pattern.c
1286 http://bugs.freedesktop.org/show_bug.cgi?id=15367
1288 Many thanks to Chris Wilson for digging out and cleaning up
1291 Fix compilation on Solaris 10 (Chris Wilson):
1293 Cairo requires -DREENTRANT (along with -D_POSIX_THREAD_SEMANTICS)
1294 to compile on Solaris 10 with pthreads
1295 https://bugs.freedesktop.org/show_bug.cgi?id=18010
1297 Fix very old bug causing dashes to be rendered at the wrong length in
1298 fallback images (Adrian Johnson)
1300 Dashed strokes too long in fallback images
1301 https://bugs.freedesktop.org/show_bug.cgi?id=9189
1303 Fix broken dashing when a dashed path starts outside the clip region
1306 Avoid range overflow when computing large patterns (Benjamin Otte and
1309 Avoid crashing due to an invalid font with an incorrect entry in its
1310 CMAP table (Adrian Johnson).
1312 Fix bugs in computing maximum size of text requests that can be sent
1313 with the Render extension, (avoiding potential crashes when rendering
1314 large amounts of text) (Behdad Esfahbod and Chris Wilson).
1316 Fix rendering of operators unbounded by the mask (Chris Wilson).
1318 Fix compilation on systems without compiler support for a native
1319 64-bit type (Chris Wilson).
1321 Fix several cases of missing error-status propagation. (Chris Wilson,
1322 doing the work he seems to never tire of).
1324 Fix several locking issues found with the lockdep valgrind skin (Chris
1327 Backend-specific bug fixes
1328 --------------------------
1329 xlib: Avoid crash due to attempting XRender calls on pixmaps with
1330 formats not supported by the Render extension (Chris Wilson):
1332 XRender crashes due to NULL pointer from Cairo on SGI O2
1333 https://bugs.freedesktop.org/show_bug.cgi?id=11734
1335 xlib: Add support for XImages with depth of 4, 20, 24, or 28 bits
1338 cairo doesn't support 24 bits per pixel mode on X11
1339 https://bugs.freedesktop.org/show_bug.cgi?id=9102
1341 xlib: Avoid mistakenly considering two surfaces as similar just
1342 because their depths match (while their Render formats do not) (Karl
1345 ps: Fix slight mis-scaling of bitmapped fonts (Adrian Johnson)
1347 svg: Correctly emit comp-op for paint, mask, and show_glyphs
1348 operations (Emmanuel Pacaud).
1350 svg: Use finer-grained fallbacks for SVG 1.2 (as PS and PDF backends
1351 have been doing since 1.6.0) (Chris Wilson).
1353 win32: Fallback to DIB if DDB create fails for
1354 cairo_surface_create_similar (Vladimir Vukicevic).
1356 win32: Fix compatibility with Windows Mobile (Vladimir Vukicevic).
1358 win32: Fix static builds to not do __declspec(dllimport) on public
1359 functions. This requires the user to set a CAIRO_WIN32_STATIC_BUILD
1360 environment variable when compiling (Behdad Esfahbod).
1362 Release 1.8.0 (2008-09-25 Carl Worth <cworth@cworth.org>)
1363 =========================================================
1364 The cairo community is happy (and relieved) to announce the 1.8.0
1365 release of the cairo graphics library. This is a major update to
1366 cairo, with new features and enhanced functionality which maintains
1367 compatibility for applications written using any previous major cairo
1368 release, (1.6, 1.4, 1.2, or 1.0). We recommend that anybody using a
1369 previous version of cairo upgrade to cairo 1.8.0.
1371 The dominant theme of this release is improvements to cairo's ability
1372 to handle text. The highlights include a new "user fonts" feature as
1373 well as a new cairo_show_text_glyphs API which allows glyphs to be
1374 embedded in PDF output along with their original text, (for searching,
1375 selection, and copy-and-paste). Another major feature is a revamp of
1376 cairo's build system making it much easier to build cairo on various
1379 See below for more details.
1383 This new API allows the user of cairo API to provide drawings for
1384 glyphs in a font. A common use for this is implementing fonts in
1385 non-standard formats, like SVG fonts and Flash fonts. This API can
1386 also be used by applications to provide custom glyph shapes for fonts
1387 while still getting access to cairo's glyph caches. See
1388 test/user-font.c and test/user-font-proxy.c for usage examples. This
1389 is based on early work by Kristian Høgsberg. Thanks Kristian!
1391 This new API consists of the following functions (and corresponding
1394 cairo_user_font_face_create
1396 cairo_user_font_face_set_init_func
1397 cairo_user_font_face_set_render_glyph_func
1398 cairo_user_font_face_set_text_to_glyphs_func
1399 cairo_user_font_face_set_unicode_to_glyph_func
1401 An additional, new API is
1403 cairo_scaled_font_text_to_glyphs
1405 We were previously reluctant to provide this function as
1406 text-to-glyphs support in cairo was limited to "toy" font
1407 functionality, not really interesting for real-world text
1408 processing. However, with user fonts landing, this API is needed to
1409 expose full access to how user fonts convert text to glyphs. This is
1410 expected to be used by text toolkits like Pango, as well as "proxy"
1411 user-font implementations.
1413 cairo_show_text_glyphs
1414 ----------------------
1415 This new API allows the caller of cairo to provide text data
1416 corresponding to glyphs being drawn. The PDF backend implements this
1417 new API so that complex text can be copied out of cairo's PDF output
1418 correctly and reliably, (assuming the user of cairo calls
1419 cairo_show_text_glyphs). The cairo_show_text_glyphs API is definitely
1420 the most daunting API to debut in cairo. It is anticipated that pango
1421 (and similar high-level text libraries) will be the primary users of
1422 this API. In fact, pango 1.22 already uses cairo_show_text_glyphs.
1423 Behdad was the architect and implementor of this effort. Thanks,
1426 The cairo_show_text_glyphs API includes the following new functions:
1428 cairo_show_text_glyphs
1430 cairo_glyph_allocate
1433 cairo_text_cluster_allocate
1434 cairo_text_cluster_free
1436 cairo_surface_has_show_text_glyphs
1440 The primary goal of the revamp is to make the build system less
1441 fragile, (particularly for non-Linux platforms). For example, now
1442 people building on win32 will no longer need to maintain a
1443 platform-specific list of files to be built. See the new README.win32
1444 for details. Also, the .so file will now be installed with a different
1445 naming scheme, (for example, 1.7.6 will install with a .10800
1446 suffix). Many thanks to Behdad and his small army of helpers!
1448 Assorted API additions
1449 ----------------------
1450 For API completeness, several missing "getter" functions were added:
1452 cairo_scaled_font_get_scale_matrix
1454 cairo_surface_get_fallback_resolution
1456 cairo_toy_font_face_create
1457 cairo_toy_font_face_get_family
1458 cairo_toy_font_face_get_slant
1459 cairo_toy_font_face_get_weight
1461 The new cairo_toy_font_face functions provide access to functionality
1462 and settings provided by cairo_select_font_face(). Thanks Behdad!
1464 cairo-ps/cairo-pdf: More efficient output
1465 -----------------------------------------
1466 Adrian Johnson has been busy fixing all kinds of bugs in PS and PDF
1467 backends, as well making them generate much more compact output by
1468 avoiding things like re-emitting the color or linestyle on every
1469 drawing operation. Thanks Adrian!
1471 cairo-xlib: dithering
1472 ---------------------
1473 Dithering: Cairo now does simple dithering when rendering to legacy X
1474 servers. This is most visible with 8-bit visuals. Thanks Behdad!
1476 cairo-xlib: Avoid rendering glyphs out of surface bounds
1477 --------------------------------------------------------
1478 This seemingly harmless optimization exposed a bug in OpenOffice.org 3
1479 versions where OO.o was passing bogus surface extents to cairo,
1480 resulting in no text rendered in OO.o. Please contact your
1481 distribution's OO.o maintainers if you see this bug and point them to
1484 https://bugs.freedesktop.org/show_bug.cgi?id=16209
1486 cairo-xlib: Improved performance with X server without Render
1487 -------------------------------------------------------------
1488 Cairo now performs better on remote X servers that lack the Render
1489 extension by being smarter about using X core protocol facilities
1490 instead of falling back to doing all rendering on the client side.
1492 cairo-ft: respecting FC_FT_FACE
1493 -------------------------------
1494 Previously it was impossible to instruct cairo to do emboldening on a
1495 font face object created from an FT_Face. Cairo now respects and uses
1496 the FC_FT_FACE fontconfig pattern element, so emboldening can be
1497 achieved by using cairo_ft_font_face_create_for_pattern() and a
1498 carefully crafted pattern using FC_FT_FACE and FC_EMBOLDEN. Thanks
1501 cairo-directfb: backend improvements
1502 ------------------------------------
1503 The directfb backend, though still unsupported, has seen a good deal
1504 of improvements. Thanks Vlad!
1506 Bug fixing and optimizations
1507 ----------------------------
1508 xlib: Faster bookkeeping (Karl Tomlinson)
1509 https://bugzilla.mozilla.org/show_bug.cgi?id=453199#c5
1511 PS: Fix gradients with non-constant alpha (Chris Wilson)
1513 Fix deadlock in user-font code (Richard Hughes and Behdad Esfahbod)
1514 http://bugs.freedesktop.org/show_bug.cgi?id=16819
1516 Countless other bugs have been fixed and optimizations made, many of
1517 them thanks to Chris Wilson. Thanks Chris and others!
1519 Note also that the code that had been in cairo 1.7.x calling into
1520 freetype's optional lcd_filter function was removed from cairo before
1521 the 1.8.0 release. We do expect this code to come back in some form in
1524 Snapshot 1.7.6 (2008-09-17 Carl Worth <cworth@cworth.org>)
1525 ==========================================================
1526 The cairo community is happy to announce the 1.7.6 snapshot of the
1527 cairo graphics library. This is a "release candidate" for the upcoming
1528 1.8.0 release, so we will greatly appreciate any reports of problems
1529 in this release, and no major changes are currently planned before
1532 Notable changes in 1.7.6
1533 ------------------------
1534 The largest number of changes since 1.7.4 did not change the
1535 implementation of cairo itself, but instead revamped cairo's build
1536 system. The primary goal of the revamp is to make the build system
1537 less fragile, (particularly for non-Linux platforms). For example, now
1538 people building on win32 will no longer need to maintain a
1539 platform-specific list of files to be built. Also, the .so file will
1540 now be installed with a different naming scheme, (for example, 1.7.6
1541 will install with a .10706 suffix). Much thanks, Behdad!
1543 And, as usual, Chris Wilson has made another large round of robustness
1544 improvements, (eliminating dead code, fixing propagation of error
1545 status values, test suite improvements, etc. etc.). Thanks as always,
1548 API changes since 1.7.4
1549 -----------------------
1550 There have been a few changes of API that was new during the 1.7
1553 * Remove cairo_font_options_set_lcd_filter
1554 and cairo_font_options_get_lcd_filter
1556 Motivation: At the Cairo Summit, this API was determined to be too
1557 specific to the freetype font backend to be in the general
1558 API. A similar API with a cairo_ft prefix might be introduced
1559 in the future. Note that cairo will still respect the
1560 corresponding fontconfig settings for these options.
1562 * Replace cairo_has_show_glyphs
1563 with cairo_surface_has_show_glyphs
1565 Motivation: This really is a surface-specific interface, and the
1566 convenience function on the cairo_t is not obviously
1567 necessary. An application can easily call:
1569 cairo_surface_has_show_glyphs (cairo_get_target (cr));
1573 * Add cairo_text_cluster_flags_t
1574 to cairo_show_text_glyphs
1575 cairo_scaled_font_text_to_glyphs
1576 cairo_user_scaled_font_text_to_glyphs_func_t
1578 Motivation: This flag, (and specifically the
1579 CAIRO_TEXT_CLUSTER_FLAG_BACKWARD value), replaces the
1580 cairo_bool_t backward argument in each of the above
1581 interfaces. This leads to more readable user code, and also
1582 allows future extensibility.
1584 As always, there are no changes to any API from any major cairo
1585 release, (1.0.x, 1.2.x, 1.4.x, 1.6.x). Cairo maintains the same
1586 compatibility promise it always has.
1588 Bug fixes since 1.7.4
1589 ---------------------
1590 xlib: Faster bookkeeping (Karl Tomlinson)
1591 https://bugzilla.mozilla.org/show_bug.cgi?id=453199#c5
1593 PS: Fix gradients with non-constant alpha (Chris Wilson)
1595 Fix deadlock in user-font code (Richard Hughes and Behdad Esfahbod)
1596 http://bugs.freedesktop.org/show_bug.cgi?id=16819
1598 Several other minor fixes.
1600 Snapshot 1.7.4 (2008-08-11 Behdad Esfahbod <behdad@behdad.org>)
1601 ===============================================================
1602 The cairo community is embarrassed to announce availability of the 1.7.4
1603 snapshot of the cairo graphics library. This is a followup release to the
1604 1.7.2 snapshot to ship a tarball that can actually be built. The only
1605 change since 1.7.4 is including the missing header file
1606 cairo-user-font-private.h in the distribution.
1608 Snapshot 1.7.2 (2008-08-11 Behdad Esfahbod <behdad@behdad.org>)
1609 ===============================================================
1610 The cairo community is finally ready to announce availability of the 1.7.2
1611 snapshot of the cairo graphics library. This is embarrassingly the first
1612 snapshot in the 1.7 unstable series of cairo, leading to the eventual release
1613 of cairo 1.8, currently planned for late September.
1615 This snapshot comes four months after the 1.6.4 release. We have done a
1616 really bad job on getting development snapshots out this cycle, but
1617 hopefully all the API changes for 1.8 are now finished and the remaining
1618 weeks will be spent on bug-fixing. There is more than 400 commits worth
1619 of changes in this snapshot, and those can use some testing. Read on!
1621 Text, text, and more text!
1622 --------------------------
1623 The dominant theme of this release, and 1.8 in general, is improvements
1624 around cairo text API. Here is a high-level list of changes with text
1629 This is new API allowing the user of cairo API to provide drawings for glyphs
1630 in a font. This is most useful in implementing fonts in non-standard formats,
1631 like SVG fonts and Flash fonts, but can also be used by games and other
1632 applications to draw "funky" fonts. See test/user-font.c and
1633 test/user-font-proxy.c for usage examples. This is based on early work by
1634 Kristian Høgsberg. Thanks Kristian!
1638 This new API allows the caller of cairo to mark text glyphs with their
1639 original text. The PDF backend implements this new API and latest Pango
1640 master uses it. The result is (when bugs are fixed) that complex text can be
1641 copied out of pangocairo's PDF output correctly and reliably. There are bugs
1642 to fix though. A few poppler bugs, and some more in cairo and pango.
1644 To test show_text_glyph, just grab pango master and this cairo snapshot and
1645 print text in gedit. Open in acroread or evince, select all, copy, paste
1646 in gedit and compare. The Arabic text with diacritic marks is particularly
1647 showing bad. Try with pango/pango-view/HELLO.txt if you are brave
1648 enough. The Indic text is showing improvements, but is still coming out
1651 LCD subpixel filtering using FreeType
1652 -------------------------------------
1653 FreeType 2.3.5 added support for various LCD subpixel filtering, and
1654 fontconfig 2.6.0 added support for configuring LCD filter on a font by font
1655 basis. Cairo now relies on FreeType and fontconfig for subpixel filtering.
1656 This work is based on David Turner's original patch to cairo, maintained
1657 and tested by Sylvain Pasche and others. Thanks all!
1659 Toy font face constructor and getter
1660 ------------------------------------
1661 Mostly for API completion, but also useful for higher level (like Pango) to
1662 hook into what the user has set using cairo_select_font_face(), making that
1663 toy API a bit more useful.
1665 FreeType: respecting FC_FT_FACE
1666 -------------------------------
1667 Previously it was impossible to instruct cairo to do emboldening on a font
1668 face object created from an FT_Face. Cairo now respects and uses the
1669 FC_FT_FACE fontconfig pattern element, so emboldening can be achieved by
1670 using cairo_ft_font_face_create_for_pattern() and a carefully crafted pattern
1671 using FC_FT_FACE and FC_EMBOLDEN.
1674 PS/PDF: More efficient output
1675 -----------------------------
1676 Adrian Johnson has been busy fixing all kinds of bugs in PS and PDF
1677 backends, as well making them generate much more compact output by avoiding
1678 things like re-emitting the color or linestyle on every drawing operation.
1684 Cairo now does simple dithering when rendering to legacy X servers. This is
1685 mostly visible with 8-bit visuals.
1687 Xlib: Avoid rendering glyphs out of surface bounds
1688 --------------------------------------------------
1689 This seemingly harmless change manifested a bug with OpenOffice.org 3 versions
1690 where OO.o was passing bogus surface extents to cairo, resulting in no text
1691 rendered in OO.o. Please contact your distro's OO.o maintainers if you see
1692 this bug and point them to the following URL:
1694 https://bugs.freedesktop.org/show_bug.cgi?id=16209
1696 Xlib: Improved performance with Xrender-less X servers
1697 ------------------------------------------------------
1698 Cairo now performs better on remote, Xrender-less X servers by being smarter
1699 about using X core protocol facilities instead of falling back to doing all
1700 rendering on the client side.
1703 Directfb: backend improvements
1704 ------------------------------
1705 The directfb backend, though still unsupported, has seen a good deal of
1706 improvements. Thanks Vlad!
1709 Bug fixing and optimizations
1710 ----------------------------
1711 Countless bugs have been fixed and optimizations made, many of them thanks to
1712 Chris Wilson. Thanks Chris!
1718 cairo_show_text_glyphs
1720 This is a new text rendering API. Being a more advanced version of
1721 cairo_show_glyphs(), it is aimed for use by higher-level text toolkits like
1722 Pango, and enables better text extraction from output generated by backends
1723 like PDF and SVG. The PDF backend already implements it, and the upcoming
1724 Pango release will use it.
1726 To make that API work, a bunch of other additions were made:
1728 cairo_glyph_allocate
1730 cairo_text_cluster_t
1731 cairo_text_cluster_allocate
1732 cairo_text_cluster_free
1733 cairo_surface_has_show_text_glyphs
1736 cairo_user_font_face_create
1738 This is the "user" font face constructor, accompanied by a variety of method
1739 signatures, getters, and setters for a callback-based font backend:
1741 CAIRO_FONT_TYPE_USER
1742 cairo_user_scaled_font_init_func_t
1743 cairo_user_scaled_font_render_glyph_func_t
1744 cairo_user_scaled_font_text_to_glyphs_func_t
1745 cairo_user_scaled_font_unicode_to_glyph_func_t
1746 cairo_user_font_face_set_init_func
1747 cairo_user_font_face_set_render_glyph_func
1748 cairo_user_font_face_set_text_to_glyphs_func
1749 cairo_user_font_face_set_unicode_to_glyph_func
1750 cairo_user_font_face_get_init_func
1751 cairo_user_font_face_get_render_glyph_func
1752 cairo_user_font_face_get_text_to_glyphs_func
1753 cairo_user_font_face_get_unicode_to_glyph_func
1756 cairo_scaled_font_text_to_glyphs
1758 We were previously reluctant to provide this function as text-to-glyphs
1759 support in cairo was limited to "toy" font functionality, not really
1760 interesting for real-world text processing. However, with user-fonts
1761 landing, this API is needed to expose full access to how user-fonts
1762 convert text to glyphs. This is expected to be used by text toolkits like
1763 Pango, as well as "proxy" user-font implementations.
1767 cairo_font_options_set_lcd_filter
1768 cairo_font_options_get_lcd_filter
1770 These add the possibility to choose between various available LCD subpixel
1771 filters. The available filter values are modeled after what FreeType
1775 cairo_toy_font_face_create
1776 cairo_toy_font_face_get_family
1777 cairo_toy_font_face_get_slant
1778 cairo_toy_font_face_get_weight
1780 These provide access to functionality and settings provided by
1781 cairo_select_font_face().
1784 cairo_scaled_font_get_scale_matrix
1785 cairo_surface_get_fallback_resolution
1787 For API completeness.
1790 Various new values for cairo_status_t enum
1795 - Type3 fonts generated by cairo's PDF backend may show up in poppler/Evince
1796 in a different color than expected. This is fixed in poppler master branch.
1797 This mostly affects cairo user fonts. The test case test/user-font.c
1800 - User fonts using other fonts in their rendering are currently embedded in
1801 PDF as fallback bitmap glyphs. This will be (hopefully) fixed before 1.8.
1802 The test case test/user-font-proxy.c demonstrates this.
1805 Release 1.6.4 (2008-04-11 Carl Worth <cworth@cworth.org>)
1806 =========================================================
1807 The cairo community is wildly embarrassed to announce the 1.6.4
1808 release of the cairo graphics library. This release reverts the xlib
1809 locking change introduced in 1.6.4, (and the application crashes that
1810 it caused). The community would be glad to sack its current release
1811 manager and is accepting applications for someone who could do the job
1812 with more discipline.
1814 Revert 'add missing locking in cairo-xlib'
1815 ------------------------------------------
1816 This change was introduced in cairo 1.6.2, but also introduced a bug
1817 which causes many cairo-xlib applications to crash, (with a
1818 segmentation fault inside of XSetClipMask). Instead of attempting
1819 another fix for the broken fix, the change in 1.6.2 has been
1820 reverted. The original bug which the change was addressing has been
1821 present since at least cairo 1.4, so it is not expected that leaving
1822 this bug unfixed will cause any new problems for applications moving
1823 from cairo 1.4 to cairo 1.6.
1825 At this point, the code of cairo 1.6.4 differs from cairo 1.6.0 only
1826 in the fix for the PostScript-printer crashes.
1828 Tweak build to avoid linking with g++
1829 -------------------------------------
1830 Cairo 1.6.4 avoids a quirk in automake that was causing the cairo
1831 library to be linked with g++ and linked against libstdc++ even when
1832 only C source files were compiled for the library.
1834 Release 1.6.2 (2008-04-11 Carl Worth <cworth@cworth.org>)
1835 =========================================================
1836 The cairo community is pleased (but somewhat sheepish) to announce the
1837 1.6.2 release of the cairo graphics library. This is an update to
1838 yesterday's 1.6.0 release with an important fix to prevent cairo's
1839 PostScript output from crashing some printers. This release also
1840 includes a locking fix for cairo's xlib backend to improve thread
1841 safety. There are no changes beyond these two fixes.
1843 Fix for PostScript printer crash
1844 --------------------------------
1845 Adrian Johnson discovered that cairo 1.6.0 was being a bit hard on
1846 PostScript printers, by changing the font matrix very frequently. This
1847 causes some PostScript interpreters to allocate new font objects every
1848 few glyphs, eventually exhausting available resources. The fix
1849 involves leaving translational components of the font matrix as zero,
1850 so that the PostScript interpreter sees an identical font matrix
1851 repeatedly, and can more easily share internal font object resources.
1853 This fix has been tested to resolve the bugs posted here, (for both
1854 Xerox and Dell printers):
1856 Printing some PDFs from evince is crashing our Xerox printer
1857 http://bugs.freedesktop.org/show_bug.cgi?id=15348
1859 Cairo-generated postscript blocks Dell 5100cn
1860 http://bugs.freedesktop.org/show_bug.cgi?id=15445
1862 Add missing locking in cairo-xlib
1863 ---------------------------------
1864 Chris Wilson noticed that cairo 1.6.0 was manipulating an internal
1865 cache of GC object within cairo's Xlib backend without proper
1866 locking. The missing locking could cause failures for multi-threaded
1867 applications. He fixed this in 1.6.2 by adding the missing locks.
1869 Release 1.6.0 (2008-04-10 Carl Worth <cworth@cworth.org>)
1870 =========================================================
1871 The cairo community is quite pleased to announce the 1.6.0 release of
1872 the cairo graphics library. This is a major update to cairo, with new
1873 features and enhanced functionality which maintains compatibility for
1874 applications written using cairo 1.4, 1.2, or 1.0. We recommend that
1875 anybody using a previous version of cairo upgrade to cairo 1.6.0.
1877 The most significant new features in this release are dramatically
1878 improved PDF and PostScript[*] output, support for arbitrary X server
1879 visuals (including PseudoColor), a new Quartz backend, and and a new
1880 "win32 printing" backend. See below for more details on these and
1883 New dependency on external pixman library (Thanks, Søren!)
1884 ----------------------------------------------------------
1885 As of cairo 1.6, cairo now depends on the pixman library, for which
1886 the latest release can be obtained alongside cairo:
1888 http://cairographics.org/releases/pixman-0.10.0.tar.gz
1890 This library provides all software rendering for cairo, (the
1891 implementation of the image backend as well as any image fallbacks
1892 required for other backends). This is the same code that was
1893 previously included as part of cairo itself, but is now an external
1894 library so that it can be shared by both cairo and by the X server,
1895 (which is where the code originated).
1897 Improved PDF, PostScript, and SVG output (Thanks, Adrian!)
1898 ----------------------------------------------------------
1899 Users of the cairo-pdf, cairo-ps, and cairo-svg should see a dramatic
1900 improvement from cairo 1.2/1.4 to 1.6. With this release there are now
1901 almost no operations that will result in unnecessary rasterization in
1902 the PDF and PostScript. Rasterized "image fallbacks" are restricted
1903 only to minimal portions of the document where something is being
1904 drawn with cairo that is beyond the native capabilities of the
1905 document, (this is rare for PDF or SVG, but occurs when blending
1906 translucent objects for PostScript).
1908 This means that the final output will be of higher quality, and will
1909 also be much smaller, and therefore will print more quickly. The
1910 machinery for doing analysis and minimal fallbacks also benefits the
1911 win32-printing surface described below.
1913 In addition to doing less rasterization, the PostScript and PDF output
1914 also has several other improvements to make the output more efficient
1915 and more compatible with specifications.
1917 [*] Note: Just before this release, a bug has been reported that the
1918 PostScript output from cairo can crash some printers, (so far the
1919 following models have been reported as problematic Xerox Workcentre
1920 7228 or 7328 and Dell 5100cn). We will implement a workaround as soon
1921 as we can learn exactly what in cairo's output these printers object
1922 to, (and we could use help from users that have access to misbehaving
1923 printers). This bug is being tracked here:
1925 Printing some PDFs from evince is crashing our Xerox printer
1926 http://bugs.freedesktop.org/show_bug.cgi?id=15348
1928 New support for arbitrary X server visuals (Thanks, Keith and Behdad!)
1929 ----------------------------------------------------------------------
1930 As of cairo 1.6, cairo should now work with an arbitrary TrueColor or
1931 8-bit PseudoColor X server visual. Previous versions of cairo did not
1932 support these X servers and refused to draw anything. We're pleased to
1933 announce that this limitation has been lifted and people stuck with
1934 ancient display systems need no longer be stuck with ancient software
1935 just because of cairo.
1937 New, supported Quartz backend for Mac OS X (Thanks, Brian and Vladimir!)
1938 ------------------------------------------------------------------------
1939 As of cairo 1.6, the cairo-quartz backend is now marked as "supported"
1940 rather than "experimental" as in previous cairo releases. Its API now
1941 has guarantees of API stability into future cairo releases, and its
1942 output quality is comparable to other backends. There have been
1943 significant improvements to cairo-quartz since 1.4. It now uses many
1944 fewer image fallbacks, (meaning better performance), and has greatly
1945 improved text rendering.
1947 New, "win32 printing" backend (Thanks, Adrian and Vladimir!)
1948 ------------------------------------------------------------
1949 A new win32-printing surface has been added with an interface very
1950 similar to the original win32 surface, (both accept an HDC
1951 parameter). But this new surface should only be called with a printing
1952 DC, and will result in all drawing commands being stored into a
1953 meta-surface and emitted after each page is complete. This allows
1954 cairo to analyze the contents, (as it does with PDF, PostScript, and
1955 SVG backends), and to do minimal image-based fallbacks as
1956 necessary. The analysis keeps things as efficient as possible, while
1957 the presence of fallbacks, (when necessary), ensure the consistent,
1958 high-quality output expected from cairo.
1960 Robustness fixes (Thanks, Chris!)
1961 ---------------------------------
1962 There has been a tremendous number of improvements to cairo's
1963 robustness. Areas that have been improved include:
1965 * Proper reporting of errors
1967 * Responding correctly to invalid input
1969 * Avoiding integer overflows
1971 * Avoiding memory leaks on error-recovery paths
1973 * Making reference counting thread safe
1975 * Exhaustive testing of memory allocation points
1977 Other fixes (Thanks, everybody!)
1978 --------------------------------
1979 Cairo's internal fixed-point representation has been changed from
1980 16.16 to 24.8. This has a direct impact on applications as it allows
1981 much larger objects to be drawn before internal limits in cairo make
1982 the drawing not work.
1984 The CAIRO_EXTEND_PAD mode is now fully supported by surface
1985 patterns. This mode allows applications to use cairo_rectangle and
1986 cairo_fill to draw scaled images with high-quality bilinear filtering
1987 for the internal of the image, but without any objectionably blurry
1988 edges, (as would happen with the default EXTEND_NONE and cairo_paint).
1990 Rendering with CAIRO_ANTIALIAS_NONE has been fixed to be more
1991 predictable, (previously image rendering and geometry rendering would
1992 be slightly misaligned with respect to each other).
1994 The reference manual at http://cairographics.org/manual now documents
1995 100% of the functions and types in cairo's public API.
1999 Several small features have been added to cairo with new API functions:
2001 cairo_format_stride_for_width
2003 Must be called to compute a properly aligned stride value before
2004 calling cairo_image_surface_create_for_data.
2006 cairo_has_current_point
2008 Allows querying if there is a current point defined for the
2013 Allows querying for path extents, (independent of any fill or
2016 cairo_surface_copy_page
2017 cairo_surface_show_page
2019 Allow beginning a new document page without requiring a cairo_t
2022 cairo_ps_surface_restrict_to_level
2024 cairo_ps_level_to_string
2025 cairo_ps_surface_set_eps
2027 Allow controlling the Post PostScript level, (2 or 3), to
2028 target, as well as to generate Encapsulated PostScript (EPS).
2030 cairo_quartz_font_face_create_for_cgfont
2032 Create a quartz-specific cairo_font_face_t from a CGFontRef.
2034 cairo_win32_font_face_create_for_logfontw_hfont
2036 Create a win32-specific cairo_font_face from a LOGFONTW and an
2041 I've accounted for 32 distinct people with attributed code added to
2042 cairo between 1.4.14 and 1.6.0, (their names are below). That's an
2043 impressive number, but there are certainly dozens more that
2044 contributed with testing, suggestions, clarifying questions, and
2045 encouragement. I'm grateful for the friendships that have developed as
2046 we have worked on cairo together. Thanks to everyone for making this
2049 Adrian Johnson, Alp Toker, Antoine Azar, Behdad Esfahbod,
2050 Benjamin Otte, Bernardo Innocenti, Bertram Felgenhauer,
2051 Boying Lu, Brian Ewins, Carl Worth, Chris Heath, Chris Wilson,
2052 Claudio Ciccani, Emmanuel Pacaud, Jeff Muizelaar, Jeremy Huddleston,
2053 Jim Meyering, Jinghua Luo, Jody Goldberg, Jonathan Gramain,
2054 Keith Packard, Ken Herron, Kouhei Sutou, Kristian Høgsberg,
2055 Larry Ewing, Martin Ejdestig, Nis Martensen, Peter Weilbacher,
2056 Richard Hult, Shailendra Jain, Søren Sandmann Pedersen,
2059 Snapshot 1.5.20 (2008-04-04 Carl Worth <cworth@cworth.org>)
2060 ===========================================================
2061 This is the tenth snapshot in cairo's unstable 1.5 series. It comes
2062 just two days (and only one working day) after the 1.5.18
2063 snapshot. The quick snapshot is due to two embarrassing bugs (both
2064 affecting cairo-xlib) that had been introduced in the 1.5.18
2065 snapshot. The fixes for these are described below along with a few
2066 other fixes, (which hopefully aren't introducing new bugs this time).
2070 Revert fix from 1.5.18 to allow pattern expansion based on the filter
2071 mode. This fix seemed so boring, (the use case it addresses is almost
2072 never used in practice), that it didn't even get mentioned in the
2073 1.5.18 release notes. However, the "fix" happened to break rendering
2074 that is always used resulting in corrupt image rendering in mozilla,
2075 evolution, and probably everything else that uses cairo.
2077 Fix to avoid BadMatch errors in cairo_surface_create_similar. These
2078 were introduced, (inadvertently, of course), as part of the fix in
2079 1.5.18 for creating similar surfaces without the Render
2080 extension. Again, thanks to mozilla, (and Vladimir Vukicevic in
2081 particular), for noticing our mistake.
2085 Correctly handle an in-error surface in
2086 cairo_surface_write_to_png. Previously this function would cause an
2087 assertion failure if you gave it a finished surface. Now it cleanly
2088 returns a CAIRO_STATUS_SURFACE_FINISHED result instead.
2090 Avoid potentially infinite wandering through memory inside
2091 _cairo_hull_prev_valid. Thanks to Jonathan Watt for noticing this
2094 https://bugzilla.mozilla.org/show_bug.cgi?id=306649#c21
2098 Fix generation of "soft" masks made by drawing to a similar surface
2099 and then calling cairo_mask_surface() with it.
2103 Fix for code that uses cairo_mask() on an intermediate surface which
2104 is later passed to cairo_mask_surface().
2106 Snapshot 1.5.18 (2008-04-05 Carl Worth <cworth@cworth.org>)
2107 ===========================================================
2108 This is the ninth snapshot in cairo's unstable 1.5 series. It comes
2109 just 4 days after the 1.5.16 snapshot. We had hoped to not need
2110 another snapshot before the final 1.6.0 release, but several critical
2111 bugs were found and fixed in the last few days, so we thought it
2112 important to let people test the fixes with this snapshot. See below
2117 The README now lists necessary dependencies.
2119 Various graphics state defaults are now documented, (source pattern is
2120 opaque black, line width is 2.0, line join is miter, line cap is butt,
2121 miter limit is 10.0, etc.).
2125 Several cleanups have been made along many error-path returns,
2126 (carefully propagating up the original error status values, cleaning
2127 up memory leaks during error recovery, etc.). This is yet another in
2128 Chris "ickle" Wilson's long series of error-handling cleanups during
2131 Avoid undesired clipping when drawing scaled surface patterns with
2136 Fix emission of 1-bit alpha masks in PDF output.
2138 Fix a bug that would cause glyphs to be misplaced along the Y axis:
2140 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%23474136
2142 Originally, an issue about a crash, but later leading to the
2143 misplaced glyphs issue being discovered.
2147 Fix misplaced glyphs in cairo's PostScript output.
2149 This issue occurs when consecutive glyphs are placed far
2150 apart. This case is exercised by the new ft-show-glyphs-table test
2151 case, which was originally inspired by the Debian bug #23474136
2154 Fix more misplaced glyphs in cairo's PostScript output:
2156 The issue here showed up under very particular circumstance, (when
2157 converting a PDF file with a CFF font with CID Identity-H encoding
2158 and using glyph 0, (defined by the CFF specification as .notdef)
2159 as a space instead). More concretely, this problem appeared when
2160 converting the UbuntuDesktop.pdf file mentioned in this bug
2163 https://bugs.freedesktop.org/show_bug.cgi?id=15348#c3
2165 As usual with arcane font-encoding-specific bugs like this, many
2166 thanks to Adrian Johnson for his magical ability to dive into
2167 specifications and emerge almost instantaneously with fixes. And
2168 thanks to Sebastien Bacher for bringing the bug to our attention.
2172 Fix serious failure on X servers without the Render extension.
2174 Since the 1.5.14 snapshot (with support for PseudoColor visuals),
2175 any application attempting to create a "similar" xlib surface would
2176 fail on an X server without the Render extension. Thanks to
2177 Frederic Crozat for pointing out that cairo's test suite was
2178 entirely failing when run against Xvfb.
2180 Avoid crashing cairo-xlib applications for too-large glyphs
2182 Naively sending glyphs of any size to the X server will eventually
2183 violate the X limit on maximum request sizes. We now properly
2184 detect when a glyph would be too large and use existing fallbacks
2185 to render the glyph rather than trying to send it to the X server.
2187 Enable the buggy_repeat workaround for Xorg servers < 1.4
2189 We have determined that Xorg 1.3.0 (as packaged in Fedora 8 at
2190 least) has a bug that can result in an X server crash when cairo
2191 uses certain X Render repeat operations, (as exercised by cairo's
2192 extend-reflect test). We avoid this crash by using fallbacks
2193 whenever a repeating surface is needed for any Xorg server with a
2194 version less than 1.4. This is slower, but should prevent the
2197 (Meanwhile, there appears to be a separate bug where some X
2198 servers or specific X-server drivers will use random pixmap data
2199 when asked to draw a repeating surface. The buggy_repeat
2200 workaround would also avoid those problems, but we have not yet
2201 characterized whether the new "version < 1.4" is a good
2202 characterization of those problems or not.)
2206 Implement cairo_font_extents for this backend.
2208 The cairo-quartz-font implementation added in the 1.5.14 snapshot was
2209 entirely missing support for the cairo_font_extents function. Thanks to
2210 Richard Hult for pointing out this obvious shortcoming, (and obvious
2211 lack of coverage in our test suite):
2213 CGFont backend returns 0 font extents
2214 https://bugs.freedesktop.org/show_bug.cgi?id=15319
2216 Snapshot 1.5.16 (2008-04-01 Carl Worth <cworth@cworth.org>)
2217 ===========================================================
2218 This is the eighth snapshot in cairo's unstable 1.5 series. It comes
2219 less than two weeks after the 1.5.14 snapshot and it really is a
2220 legitimate snapshot, (in spite of sharing this date with that of many
2221 bogus announcements). The major change in this snapshot is that the
2222 cairo-quartz backend is now officially "supported", including new API
2223 to construct a font face from a CGFontRef . Also several bug fixes
2224 have been fixed in many backends. See below for details.
2228 Cairo now depends on pixman 0.10.0 which was recently released. The
2229 latest pixman release can always be found alongside cairo releases at:
2231 http://cairographics.org/releases
2233 Increase the precision of color stops for gradients. This fixes a
2234 regression in gradient rendering that had been present since the
2237 paginated (all of ps, pdf, svg, and win32-printing)
2238 ---------------------------------------------------
2239 Fix assertion failure when some drawing elements are outside the page
2240 boundaries, (this bug was noticed when using Inkscape to print a
2241 drawing with landscape orientation to a portrait-oriented piece of
2246 Fix of bug causing incorrect glyph positioning.
2248 Fix handling of CAIRO_OPERATOR_SOURCE.
2252 More reduction of unnecessary digits of precision in PDF output.
2254 Fix handling of CAIRO_OPERATOR_SOURCE.
2258 Fix bug in usage of libpng that was preventing cairo_mask from working
2259 with the svg backend.
2261 Fix transformation of source pattern for cairo_stroke().
2263 cairo-win32-printing
2264 --------------------
2265 Fix fallback resolution, (thanks again to inkscape users/developers
2266 for helping us find this one).
2270 Mark the cairo-quartz backend as "supported" rather than
2271 "experimental". This means the following:
2273 * The backend will now be built by default (if possible).
2275 * We are committing that the backend-specific API (as published in
2276 cairo-quartz.h) are stable and will be supported in all future
2279 * We are committing that the output quality of this backend
2280 compares favorably with other cairo backends, (and that quality
2281 is ensured by good results from the cairo test suite).
2283 * We recommend that distributions build and distribute this
2284 backend when possible.
2286 Note that the cairo_quartz_image API (in cairo-quartz-image.h) is
2287 still experimental, will not build by default, (pass
2288 --enable-quartz-image to configure to build it), and may see API
2289 changes before it is marked as "supported" in a future release.
2291 Put the CAIRO_FONT_TYPE_ATSUI name back into
2292 cairo-deprecated.h. Without this, the cairo 1.5.14 snapshot broke all
2293 builds for applications using the C++ cairomm bindings (and perhaps
2294 others) which have the CAIRO_FONT_TYPE_ATSUI name in their header
2295 files. This breakage happened even for applications not using
2296 cairo-quartz at all.
2298 Note: Even though the CAIRO_FONT_TYPE_ATSUI name is provided to
2299 avoid this build breakage, we still recommend that bindings and
2300 applications move to the new, and more accurate,
2301 CAIRO_FONT_TYPE_QUARTZ name.
2303 Replace the implementation of cairo-quartz-font to use CFFont instead
2304 of ATSUI. The CGFont API is a better fit than ATSUI, and this new
2305 implementation is also more correct than the old one as well.
2307 This also adds the following new API call:
2309 cairo_public cairo_font_face_t *
2310 cairo_quartz_font_face_create_for_cgfont (CGFontRef font);
2312 The previous cairo_quartz_font_face_create_for_atsu_font_id function
2313 continues to exist and is part of the supported API going
2314 forward. (However, the old name of that same function, which was
2315 cairo_atsui_font_face_create_for_atsu_font_id is officially
2316 deprecated. Any source code using the old name should be updated to
2319 Fix transformation of source pattern for cairo_stroke().
2323 Avoid crash in create_similar is cairo_win32_surface_create fails.
2325 Snapshot 1.5.14 (2008-03-20 Carl Worth <cworth@cworth.org>)
2326 ===========================================================
2327 This is the seventh snapshot in cairo's unstable 1.5 series. It comes
2328 3 weeks after the 1.5.12 snapshot. This snapshot includes support for
2329 arbitrary X server visuals, (including PseudoColor), which was the
2330 final remaining cairo-specific item on the cairo 1.6 roadmap. It also
2331 includes a huge number of improvements to the cairo-quartz backend. So
2332 this is effectively a cairo 1.6 release candidate. We expect very few
2333 changes from now until 1.6 and only for specific bug fixes.
2337 Rename ATSUI font backend to Quartz font backend. This affects the
2340 --enable-atsui -> --enable-quartz-font
2341 CAIRO_HAS_ATSUI_FONT -> CAIRO_HAS_QUARTZ_FONT
2342 CAIRO_FONT_TYPE_ATSUI -> CAIRO_FONT_TYPE_QUARTZ
2344 cairo_atsui_font_face_create_for_atsu_font_id ->
2345 cairo_quartz_font_font_create_for_atsu_font_id
2347 This API change is justified by the cairo-quartz backend still be
2348 marked as "experimental" rather than "supported", (though this is one
2349 step toward making the change to "supported" before 1.6). Cairo will
2350 still provide ABI compatibility with the old symbol name, however.
2352 paginated (all of ps, pdf, svg, and win32-printing)
2353 ---------------------------------------------------
2354 Optimize by not analyzing an image surface for transparency more than
2355 once, (previously all images were analyzed twice).
2357 cairo-ps and cairo-pdf
2358 ----------------------
2359 Avoiding emitting a matrix into the stroke output when unnecessary,
2360 (making output size more efficient).
2362 Reduce rounding error of path shapes by factoring large scale factors
2363 out of the path matrix, (ensuring that a fixed-number of printed
2364 digits for path coordinates contains as much information as possible).
2366 Reduce excess digits for text position coordinates. This makes the
2367 output file size much smaller without making the result any less
2372 Eliminate bug causing extraneous text repetition on Linux PostScript
2373 output in some cases.
2375 See: Mozilla Bug 419917 – Printed page contents are reflected
2376 inside bordered tables (Linux-only)
2378 https://bugzilla.mozilla.org/show_bug.cgi?id=419917
2380 Optimize output when EXTEND_PAD is used.
2384 Fix to not use fill-stroke operator with transparent fill, (else PDF
2385 output doesn't match the cairo-defined correct result). See:
2387 https://bugs.launchpad.net/inkscape/+bug/202096
2391 Fix stroke of path with a non-solid-color source pattern:
2393 http://bugs.freedesktop.org/show_bug.cgi?id=14556
2397 Fix text rendering with gradient or image source pattern.
2399 Handling antialiasing correctly for cairo_stroke(), cairo_clip(), and
2400 cairo_show_text()/cairo_show_glyphs().
2402 Correctly handle gradients with non-identity transformations:
2404 Fixes http://bugs.freedesktop.org/show_bug.cgi?id=14248
2406 Add native implementation of REPEAT and REFLECT extend modes for
2409 Fix implementation for the "unbounded" operators, (CAIRO_OPERATOR_OUT,
2410 _IN, _DEST_IN, and _DEST_ATOP).
2412 Correctly handle endiannees in multi-architecture compiles on Mac OS
2415 Avoid behavior which would cause Core Graphics to print warnings to
2416 the console in some cases.
2420 Fix handling of miter limit.
2422 cairo-win32-printing
2423 --------------------
2424 Fix to not use a 1bpp temporary surface in some cases while printing,
2425 (so grayscale data is preserved rather than just becoming black and
2430 Add support for rendering to arbitrary TrueColor X server
2431 visuals. This fixes at least the following bugs:
2433 cairo doesn't support 8-bit truecolor visuals
2434 https://bugs.freedesktop.org/show_bug.cgi?id=7735
2436 cairo doesn't support 655 xlib format
2437 https://bugs.freedesktop.org/show_bug.cgi?id=9719
2439 Add support for rendering to 8-bit PseudoColor X server visuals. This
2440 fixes the following bug:
2442 Cairo doesn't support 8-bit pseudocolor visuals
2443 https://bugs.freedesktop.org/show_bug.cgi?id=4945
2445 Snapshot 1.5.12 (2008-02-28 Carl Worth <cworth@cworth.org>)
2446 ===========================================================
2447 This is the sixth snapshot in cairo's unstable 1.5 series. It comes 1
2448 week after the 1.5.10 snapshot. This snapshot includes the
2449 long-awaited change from 16.16 to 24.8 fixed-point values, (see below
2450 for why you should care). It also includes several backend-specific
2453 24.8 fixed-point format
2454 -----------------------
2455 Cairo has always converted path coordinates to a fixed-point
2456 representation very early in its processing. Historically, this has
2457 been a 32-bit representation with 16 bits of integer for the
2458 device-pixel grid and 16 bits of sub-pixel positioning. The choice of
2459 16 bits for the integer coordinate space was based on the 16-bit limit
2460 for X Window drawables.
2462 This 16-bit limit has proven problematic for many applications. It's
2463 an especially vexing problem when targeting non-X backends that don't
2464 have any 16-bit restriction. But even when targeting cairo-xlib, it's
2465 often desirable to draw a large shape, (say a background rectangle),
2466 that extends beyond the surface bounds and expect it to fill the
2467 surface completely, (rather than overflowing and triggering random
2470 Meanwhile, nobody has ever really needed 16 bits of sub-pixel
2473 With this snapshot, the fixed-point system is still in place and is
2474 still using a 32-bit representation, (future versions of cairo might
2475 move entirely to floating-point when targeting PDF output for
2476 example). But the representation now provides 24 bits of pixel
2477 addressing and only 8 bits of sub-pixel positioning. This should give
2478 a much less stifling space to many applications.
2480 However, the underlying pixman library still has 16-bit limitations in
2481 many places, (it has its roots in the X server as well). Until those
2482 are also fixed, applications targeting cairo image surfaces, or
2483 hitting software fallbacks when targeting other surfaces will still
2484 encounter problems with device-space values needing more than 16
2489 Add a few tests to the test suite to increase coverage.
2491 Cleanup a few error-handling paths, (propagate error correctly).
2495 Fix handling of font sizes smaller than 1 device pixel.
2499 Fix to properly save/restore clip when analyzing meta-surface
2500 patterns, (fixing a couple of test-suite failures).
2502 Implement native support for CAIRO_OPERATOR_SOURCE when the source
2505 Emit rectangles as PDF rectangles ("re" operator) rather than as
2510 Fix to work properly with the 16.16->24.8 change.
2514 Fix CAIRO_EXTEND_REFLECT by using an image fallback, (there's no
2515 direct SVG support for reflected patterns).
2517 Fix the use of alpha-only masks, (such as CAIRO_FORMAT_A8).
2521 Add new API for efficiently using image data as a source:
2524 cairo_quartz_image_surface_create (cairo_surface_t *image_surface);
2527 cairo_quartz_image_surface_get_image (cairo_surface_t *surface);
2529 For full documentation, see:
2531 http://cairographics.org/manual/cairo-Quartz-Surfaces.html#cairo-quartz-image-surface-create
2533 Several fixes for cairo_mask().
2537 Change default from from Monaco to Helvetica to be more consistent
2538 with other font backends.
2540 Snapshot 1.5.10 (2008-02-20 Carl Worth <cworth@cworth.org>)
2541 ===========================================================
2542 This is the fifth snapshot in cairo's unstable 1.5 series. It comes 3
2543 weeks after the 1.5.8 snapshot. This snapshot adds one new API
2544 function, (cairo_has_current_point), and the usual mix of
2545 improvements, (more efficient PostScript/PDF output, optimized
2546 stroking), and fixes (more robust error-handling, etc.). See below for
2551 Add a new function to query if there is a current point:
2554 cairo_has_current_point (cairo_t *cr);
2556 There is no current point immediately after cairo_create(), nor after
2557 cairo_new_path() or cairo_new_sub_path(). There is a current point
2558 after any of the path-creation functions, (cairo_move_to,
2559 cairo_line_to, cairo_curve_to, etc.).
2561 With this new function, we also revert the change of the return type
2562 of cairo_get_current_point from cairo 1.5.8, (it's now a void function
2567 Optimize stroking code to avoid repeated calculation of redundant
2568 values, (particularly significant for very large, offscreen paths).
2572 Patch a few more potential buffer overruns, (due to integer
2575 Many fixes and improvements to cairo's error-handling, (ensure that
2576 correct error values are returned, clean up memory leaks on
2577 error-handling paths, etc.).
2579 Fix a potential infinite loop when stroking a spline with a pen that
2580 has been transformed to a line segment.
2582 Remove treating NULL as a synonym for a valid cairo_font_options_t*
2583 with default values, (a change that had been introduced as of cairo
2586 Remove the altered handling of tolerance and fallback-resolution that
2587 had been introduced as of cairo 1.5.4.
2591 Pass the original Drawable, (as opposed to the root window), to
2592 XCreatePixmap when creating a similar surface. This gives the X server
2593 more information so that it can be clever and efficient.
2597 Fix the rendering of repeating and reflecting patterns.
2599 Ensure miter limit is always >= 1, (smaller limits are not meaningful,
2600 but they can cause some PDF viewers to fail to display pages).
2602 Generate more efficient output when the same path is used for both
2607 Start sharing much of the cairo-pdf code rather than implementing very
2608 similar code in cairo-ps.
2610 Implement native support for repeating and reflecting linear
2613 Implement reflected surface patterns.
2615 Ensure miter limit is always >= 1, (smaller limits are not meaningful,
2616 but they can cause some PostScript viewers to crash).
2618 Generate PostScript that will perform more efficiently and use less
2619 memory on printers, (use currentfile instead of a giant string array
2620 for image data, and avoid using PostScript patterns for paint() and
2621 fill() when possible).
2625 Avoid unnecessary rasterization when copying a "similar" surface to
2626 another svg surface, (allow the SOURCE operator to be implemented with
2627 all-vector operations if there are no underlying objects).
2631 Eliminate infinite loop when attempting to render an empty string.
2633 Snapshot 1.5.8 (2008-01-30 Carl Worth <cworth@cworth.org>)
2634 ==========================================================
2635 This is the fourth snapshot in cairo's unstable 1.5 series. It comes 2
2636 weeks after the 1.5.6 snapshot. It adds a few new API functions. Most
2637 notably all callers of cairo_image_surface_create_for_data should now
2638 be calling cairo_format_stride_for_width to compute a legal stride
2639 value. See below for more details.
2641 New API in cairo 1.5.8
2642 ----------------------
2643 We've added a new function that should be called to compute a legal
2644 stride value before allocating data to be used with
2645 cairo_image_surface_create_for_data:
2648 cairo_format_stride_for_width (cairo_format_t format,
2651 We've also added a new cairo_path_extents function that can be used to
2652 compute a bounding box for geometry such as a single line segment,
2653 (contrast with cairo_path_extents and cairo_stroke_extents):
2656 cairo_path_extents (cairo_t *cr,
2657 double *x1, double *y1,
2658 double *x2, double *y2);
2660 And finally, we've added a function to allow for querying the
2661 XRenderPictFormat of a cairo-xlib surface:
2664 cairo_xlib_surface_get_xrender_format (cairo_surface_t *surface);
2668 Fix return types of cairo_surface_show_page and
2669 cairo_surface_copy_page. This is an API change to functions that are
2670 new in the 1.5 series, so not an API break compared to any stable
2671 cairo release, (1.0.x, 1.2.x, 1.4.x).
2673 Change the return type of cairo_get_current_point() from void to
2674 cairo_status_t. This allows the caller to receive a
2675 CAIRO_STATUS_NO_CURRENT_POINT value to distinguish the a current point
2676 at the origin from no current point existing.
2678 Performance improvement
2679 -----------------------
2680 Improve performance of clipping by using an optimized code path
2681 internally, (with the ADD operator instead of IN).
2685 Fix various cairo_*_extents functions to initialize the return-value
2686 variables even in the case of a cairo_t in error.
2688 Treat NULL as a legitimate value for cairo_font_options_t*. [NOTE:
2689 On discussion afterwards, we decided against this change so it has
2690 been removed as of cairo 1.5.10.]
2692 Fix rendering with CAIRO_ANTIALIAS_NONE to be more predictable, (that
2693 is, to avoid seams appearing when geometry and imagery share an
2694 identical edge). Portions of this fix are in the pixman library and
2695 will appear in a future release of that library.
2697 Avoid triggering an error for a font size of 0.
2699 Miscellaneous changes
2700 ---------------------
2701 Require pixman >= 0.9.6.
2703 There has been a tremendous amount improvement to cairo's
2704 documentation. We're delighted that 100% of the public API has at
2705 least some documentation in the API reference manual. Many thanks to
2706 Behdad Esfahbod and Nis Martensen for leading this effort.
2708 cairo-pdf and cairo-ps
2709 ----------------------
2710 Eliminate failure when a Type 1 font is embedded with an explicit
2715 Implement a more correct and more efficient approach for patterns with
2716 an extend mode of CAIRO_EXTEND_REFLECT.
2720 Fix image masks to properly pack and pad mask bits.
2724 Take care to only use DrawTiledImage for integer-aligned images, (and
2725 use slower paths to get the correct result in other cases).
2729 Fix for older versions of mingw.
2731 Improve the handling of the clipping with the win32 and win32-printing
2734 Fix rendering of non black/white text.
2736 Snapshot 1.5.6 (2008-01-15 Carl Worth <cworth@cworth.org>)
2737 ==========================================================
2738 This is the third snapshot in cairo's unstable 1.5 series. It comes
2739 about 6 weeks after the 1.5.4 snapshot. The only API addition compared
2740 to 1.5.4 is very minor, (a new value CAIRO_STATUS_TEMP_FILE_ERROR).
2741 The remainder of the changes are the usual accumulation of bug fixes
2742 and improvements. See below for details.
2746 Fix handling of fonts that contain a mixture of outline and bitmapped
2747 glyphs. There was a change in this handling in 1.5.4 that improved
2748 some cases and also regressed other cases. Now, all cases should be
2751 Fix alignment issues that were causing SIGBUS failures on SPARC.
2753 Fix a regression (which first appeared in 1.5.2) where stroking under
2754 a large scale would sometimes incorrectly replace a miter join with a
2755 bevel join. (Thanks to Keith Packard.)
2757 Fix reporting of zero-sized extents to be {0,0} rather than
2758 {INT_MAX,INT_MIN}. This avoids several integer overflow and
2759 allocations of massive regions in some cases.
2761 Fix failures of gradients with no stops, (quartz, ps, and pdf).
2763 Fix handling of Type 1 fonts on Windows platforms.
2765 Fix handling of Type 1 fonts with no specific family name in the font
2766 itself, (generate a CairoFont-x-y name).
2768 Handle NULL string values in cairo_show_text, cairo_show_glyphs, and
2771 Many robustness improvements along error-handling paths, (thanks as
2772 always, to Chris "ickle" Wilson).
2774 Various other minor fixes.
2776 Paginated backends (PDF/PostScript/win32-printing)
2777 --------------------------------------------------
2778 Avoid unnecessary rasterization when using a paginated surface as a
2779 source, (such as drawing from one pdf surface to another).
2781 Fix replaying of paginated surface with more than one level of push/pop
2786 Fix xlib backend to not consider recent X server release as having a
2787 buggy repeat implementation in the Render extension.
2791 Fix PDF output to avoid triggering very slow rendering in PDF viewers,
2792 (avoid starting and stopping the content stream for each pattern
2795 Support CAIRO_OPERATOR_SOURCE in cases where there is nothing below
2796 the object being drawn.
2798 Fix to avoid seams appearing between multiple fallback regions.
2800 cairo-ps (PostScript)
2801 ---------------------
2802 Use correct bounding box in Type 3 fonts.
2804 Fix several bugs in cairo's PostScript output. These include making
2805 the PostScript output more compatible with recent versions of
2806 ghostscript that are more strict about Type 3 fonts, for
2809 Fix for win32 to not attempt to create temporary files in the root
2810 directory, (where the user may not have write permission).
2812 Avoid generating Level 3 PostScript if Level 2 is sufficient. Also,
2813 add code in output documents to alert the user if Level 3 PostScript
2814 is handed to a device that cannot handle PostScript beyond Level
2819 Various performance optimizations.
2821 Fixed support for small surfaces (less than 8x8).
2823 Provide support for environment variables CAIRO_DIRECTFB_NO_ACCEL to
2824 disable acceleration and CAIRO_DIRECTFB_ARGB_FONT to enable ARGB fonts
2829 Allow OS/2 APIs instead of C library allocation functions.
2831 Snapshot 1.5.4 (2007-12-05 Carl Worth <cworth@cworth.org>)
2832 ==========================================================
2833 This is the second snapshot in cairo's unstable 1.5 series. It comes
2834 just over 1 month after the 1.5.2 snapshot. There are no API changes
2835 or additions in 1.5.4 compared to 1.5.2, but there are several bug
2836 fixes, and some optimizations. Most of these apply to particular
2837 backends. See below for details.
2839 General improvements
2840 --------------------
2841 Use less memory for spline approximation calculations.
2843 Change how the tolerance value is interpreted with regard to
2844 fallback-resolution. [Note: On further discussion, we decided against
2845 this change for now. It is removed as of cairo 1.5.10.]
2847 Fix precision of floating-point values in vector-output backends to
2848 avoid rounding errors with very small numbers.
2852 Fix bug in glyph rendering with xlib, (due to everything being clipped
2853 out). This was a regression in the 1.5.2 snapshot that was visible in
2854 the GIMP, for example. See:
2856 cairo 1.5.2 causes font problems in GIMP 2.4 status bar and evolution 2.12.1
2857 https://bugs.freedesktop.org/show_bug.cgi?id=13084
2859 PostScript improvements
2860 -----------------------
2861 Fix bug leading to invalid PostScript files when rendering
2862 text, (need "0 0 xyshow" instead of "0 xyshow").
2864 Fix many issues with Type 3 fonts, including making the resulting text
2869 Fix font metrics height value for ATSUI, (helps webkit on GTK+ OS X
2874 Fix EXTEND_NONE mode for patterns.
2876 Fix cairo_quartz_surface_create to properly clear the new surface
2877 in cairo_quartz_surface_create.
2879 Fix to correctly handle 0x0 sized surfaces.
2881 Optimize drawing of EXTEND_REPEAT patterns for OS X 10.5.
2883 Snapshot 1.5.2 (2007-10-30 Carl Worth <cworth@cworth.org>)
2884 ==========================================================
2885 This is the first snapshot in cairo's unstable 1.5 series. It comes 4
2886 months after the 1.4.10 release. This snapshot includes significant
2887 improvements to PDF and PostScript output, which is one of the things
2888 in which we're most interested in getting feedback. There are a couple
2889 of minor API additions, and several optimizations, (primarily in the
2890 "print/vector" backends). And there are dozens of bug fixes and
2891 robustness improvements.
2893 New dependency on external pixman library
2894 -----------------------------------------
2895 A significant change in this snapshot compared to all previous cairo
2896 releases is that cairo now depends on an external "pixman" library for
2897 its software rendering. Previously this same code was compiled
2898 internally as part of cairo, but now the code is separate so that both
2899 cairo and the X server can now share common code, (thanks very much to
2900 Søren Sandmann for his work on separating pixman and maintaining it).
2902 So users will need to acquire and build pixman before being able to
2903 build cairo. The current release is 0.9.6 and can be obtained from
2906 http://cairographics.org/releases/pixman-0.9.6.tar.gz
2908 which can be verified with:
2910 http://cairographics.org/releases/pixman-0.9.6.tar.gz.sha1
2911 66f01a682c64403a3d7a855ba5aa609ed93bcb9e pixman-0.9.6.tar.gz
2913 http://cairographics.org/releases/pixman-0.9.6.tar.gz.sha1.asc
2914 (signed by Carl Worth)
2916 Major PDF/PostScript improvements
2917 ---------------------------------
2918 Adrian Johnson has done some long-awaited work to make cairo's PDF and
2919 PostScript output more interesting than ever before. First, many
2920 operations that previously triggered image fallbacks will now be
2921 rendered as native vectors. These operations include:
2923 PDF: cairo_push_group, cairo_surface_create_similar,
2924 cairo_mask, A8/A1 surface sources, repeating/reflecting linear
2927 PostScript: cairo_push_group, cairo_surface_create_similar,
2928 gradients, bilevel alpha masks, (for example, all values either 0 or
2929 255 for an A8 mask).
2931 Not only that, but when an image fallback is required, it will now be
2932 limited to only the necessary region. For example, a tiny translucent
2933 image overlaying a small portion of text would previously caused an
2934 entire PostScript page to be rendered as a giant image. Now, the
2935 majority of that page will be nice text, and there will only be a tiny
2936 image in the output.
2938 Additionally, the PostScript output now carefully encodes text so that
2939 if it is subsequently converted to PDF, the text will be
2942 This is very exciting progress, and we're hoping to hear from users
2943 during the 1.5 series about how things have improved, (for example,
2944 inkscape users doing cairo-based PDF export: please let us know how
2945 things look). And feel free to pass your thanks along to Adrian for his excellent work.
2947 NOTE: This much improved PDF output makes more sophisticated use of
2948 functionality in the PDF specification. This means that cairo's output
2949 will sometimes expose bugs in some free software PDF viewers, (evince,
2950 poppler, and xpdf, for example), that are not yet ready for such PDF
2951 files. We're working with the poppler maintainers to get these bugs
2952 fixed as quickly as possible. In the meantime, please double-check
2953 with other PDF viewers if cairo-generated PDF files are not being
2954 rendered correctly. It may be due to a bug in the viewer rather than
2955 in the PDF file that cairo has created.
2957 Robustness improvements
2958 -----------------------
2959 Chris Wilson has made the largest contribution by far to cairo 1.5.2,
2960 (in number of commits). His more than 150 commits include a huge
2961 number of fixes to increase cairo's robustness. These fixes make cairo
2962 more robust against invalid and degenerate input, (NaN, empty path,
2963 etc.), against size-0 malloc calls, against memory leaks on
2964 error-recovery paths, and against other failures during error
2965 handling. He also implemented atomic operations to cairo, and used
2966 them to fix cairo's previously non-thread-safe reference counting,
2967 again improving robustness.
2969 Chris has put a tremendous amount of time and effort into writing
2970 analysis tools for this work, and in running those tools and fixing
2971 the problems they report. We're very grateful for this work, and hope
2972 that all cairo users appreciate the more robust implementation that
2975 This work is largely thankless, so it might make sense to notice
2976 sometime that cairo has been running quite smoothly for you, and when
2977 you do, send a quick "thank you" off to Chris Wilson, since it
2978 is all definitely running smoother thanks to his work.
2982 There are no major additions to cairo's core API. The only new,
2983 generic functions are:
2986 cairo_surface_copy_page (cairo_surface_t *surface);
2989 cairo_surface_show_page (cairo_surface_t *surface);
2991 which can now be used much more conveniently than the existing
2992 cairo_copy_page and cairo_show_page functions in some
2993 situations. These functions act identically, but require only a
2994 cairo_surface_t* and not a cairo_t*.
2996 All other API additions are specific to particular backends.
2998 New cairo-win32 API (new font face function and "win32 printing" surface)
2999 -------------------------------------------------------------------------
3000 There is a new function for creating a win32 font face for both a
3001 logfontw and an hfont together. This complements the existing
3002 functions for creating a font face from one or the other:
3005 cairo_win32_font_face_create_for_logfontw_hfont (LOGFONTW *logfont,
3008 There is also a new "win32 printing" surface:
3011 cairo_win32_printing_surface_create (HDC hdc);
3013 This interface looks identical to the original
3014 cairo_win32_surface_create, (both accept and HDC), but the behavior of
3015 this new surface is very different. It should only be called with a
3016 printing DC, and will result in all drawing commands being stored into
3017 a meta-surface and emitted after each page is complete, with analysis
3018 to do as minimal image-based fallbacks as necessary. The behavior and
3019 implementation shares much with the PDF and PostScript backends.
3021 New cairo-ps API (EPS and PostScript level control)
3022 ---------------------------------------------------
3023 An often requested feature has been the ability to generate
3024 Encapsulated PostScript (EPS) with cairo. We have that now with the
3025 following very simple API. Just do cairo_ps_surface_create as usual
3026 then call this function with a true value:
3029 cairo_ps_surface_set_eps (cairo_surface_t *surface,
3032 [NOTE: As always with snapshots, it's possible---though not very
3033 likely---that the API could still be modified before a final
3034 release. For example, this is the first public cairo function that
3035 accepts a Boolean parameter. I'm generally opposed to Boolean
3036 parameters, but this is probably the one case where I'm willing to
3037 accept one, (namely a "set" function that accepts a single Boolean).]
3039 Also, it is now possible to control what PostScript level to target,
3040 (either level 2 or level 3), with the following new API:
3042 typedef enum _cairo_ps_level {
3048 cairo_ps_surface_restrict_to_level (cairo_surface_t *surface,
3049 cairo_ps_level_t level);
3052 cairo_ps_get_levels (cairo_ps_level_t const **levels,
3056 cairo_ps_level_to_string (cairo_ps_level_t level);
3058 Improvement for cairo-quartz
3059 ----------------------------
3060 Brian Ewins had contributed several improvements to cairo-quartz. These
3061 include an implementation of EXTEND_NONE for linear and radial
3062 gradients, (so this extend mode will no longer trigger image fallbacks
3063 for these gradients), as well as native surface-mask clipping, (only
3064 on OS X 10.4+ where the CGContextClipToMask function is available).
3066 He also fixed a semantic mismatch between cairo and quartz for dashing
3067 with an odd number of entries in the dash array.
3069 We're grateful for Brian since not many quartz-specific improvements
3070 to cairo would be happening without him.
3074 Optimize SVG output for when the same path is both filled and stroked,
3075 and avoid unnecessary identity matrix in SVG output. (Emmanuel Pacaud).
3077 Optimize PS output to take less space (Ken Herron).
3079 Make PS output more compliant with DSC recommendations (avoid initclip
3080 and copy_page) (Adrian Johnson).
3082 Make PDF output more compact (Adrian Johnson).
3084 Release glyph surfaces after uploading them to the X server, (should
3085 save some memory for many xlib-using cairo application). (Behdad
3088 Optimize cairo-win32 to use fewer GDI objects (Vladimir Vukicevic).
3090 win32-printing: Avoid falling back to images when alpha == 255
3091 everywhere. (Adrian Johnson).
3093 win32-printing: Avoid falling back for cairo_push_group and
3094 cairo_surface_create_similar. (Adrian Johnson)
3098 Avoid potential integer overflows when allocating large buffers
3099 (Vladimir Vukicevic).
3101 Preparations to allow the 16.16 fixed-point format to change to
3102 24.8 (Vladimir Vukicevic).
3104 Fix bugs for unsupported X server visuals (rgb565, rgb555, bgr888, and
3105 abgr8888). (Carl Worth and Vladimir Vukicevic)
3107 Fix bugs in PDF gradients (Adrian Johnson).
3109 Fix cairo-xlib to build without requiring Xrender header
3110 files (Behdad Esfahbod).
3112 Make cairo more resilient in the case of glyphs not being available in
3113 the current font. (Behdad Esfahbod)
3115 Prevent crashes when both atsui and ft font backends are compiled in
3118 Make font subsetting code more robust against fonts that don't include
3119 optional tables (Adrian Johnson).
3121 Fix CFF subsetting bug, (which manifested by generating PDF files that
3122 Apple's Preview viewer could not read) (Adrian Johnson).
3124 Fixed error handling for quartz and ATSUI backends (Brian Ewins).
3126 Avoid rounding problems by pre-transforming to avoid integer-only
3127 restrictions on transformation in GDI (Adrian Johnson).
3129 Fixed an obscure bug (#7245) computing extents for some stroked
3132 Fix crashes due to extreme transformation of the pen, (seems to show
3133 up in many .swf files for some reason) (Carl Worth).
3135 Release 1.4.10 (2007-06-27 Carl Worth <cworth@cworth.org>)
3136 ==========================================================
3137 This is the fifth update in cairo's stable 1.4 series. It comes
3138 roughly three weeks after the 1.4.8 release. The most significant
3139 change in this release is a fix to avoid an X error in certain cases,
3140 (that were causing OpenOffice.org to crash in Fedora). There is also a
3141 semantic change to include child window contents when using an xlib
3142 surface as a source, an optimization when drawing many rectangles, and
3143 several minor fixes.
3145 Eliminate X errors that were killing OO.o (Chris Wilson)
3146 --------------------------------------------------------
3147 Cairo is fixed to avoid the X errors propagated when cleaning up
3148 Render Pictures after the application had already destroyed the
3149 Drawable they reference. (It would be nice if the X server wouldn't
3150 complain that some cleanup work is already done, but there you have
3151 it.) This fixes the bug causing OpenOffice.org to crash as described
3154 XError on right click menus in OOo.
3155 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=243811
3157 Use IncludeInferiors when using xlib surface as a source (Ryan Lortie)
3158 ----------------------------------------------------------------------
3159 When an xlib surface is used as the source of a draw operation the
3160 contents of child windows are now included in the source data. The
3161 semantics of drawing to xlib surfaces are unchanged (ie: draws are
3162 still clipped by child windows overlapping the destination window).
3164 Optimize drawing of many rectangles (Vladimir Vukicevic)
3165 --------------------------------------------------------
3166 Avoid O(N*N) loop when filling many axis-aligned rectangles, (either
3167 many rectangles as separate sub-paths or due to dashing).
3171 Fix cairo-perf on Solaris by linking to librt. (Behdad Esfahbod)
3173 Fix make check for systems that require executable files to have a
3174 particular extension. (Behdad Esfahbod)
3176 Eliminate some warnings in cairo-quartz. (Brian Ewins)
3178 Fix build-breaking typo for cairo-directfb. (Chris Wilson)
3180 Release 1.4.8 (2007-06-07 Carl Worth <cworth@cworth.org>)
3181 =========================================================
3182 This is the fourth update in cairo's stable 1.4 series. It comes just
3183 over five weeks after the 1.4.6 release. This release includes a
3184 thread-safe surface-cache for solid patterns which significantly
3185 improves text rendering with the xlib backend. Also, dozens of error
3186 paths in cairo have been fixed thanks to extensive fault-injection
3187 testing by Chris Wilson.
3189 Surface cache for solid patterns
3190 --------------------------------
3191 Originally written by Jorn Baayen, the introduction of a small cache
3192 for surfaces created for solid patterns improves performance
3193 dramatically. For example, this reduces the volume of X requests
3194 during text rendering to the same level as Xft.
3196 This cache first made its appearance in a 1.3.x snapshot, but was
3197 removed before appearing in any previous major release due to
3198 complications with multi-threaded programs. For example, programs like
3199 evince that would carefully restrict usage of cairo-xlib to a single
3200 thread were unpleasantly surprised to find that using cairo-image in a
3201 separate thread could trigger X requests.
3203 Behdad Esfahbod designed a fix which was implemented by Chris
3204 Wilson. Now, the necessary X requests are queued up until the next
3205 time the application directly operates on an xlib surface.
3207 Improved error handling paths
3208 ------------------------------
3209 Chris Wilson continued the excellent work he started in cairo 1.4.4 to
3210 make cairo much more robust against out-of-memory and other errors. He
3211 applied his memory allocation fault injection cairo's main test suite,
3212 (previously he had applied it to cairo's performance suite).
3214 Chris's testing found dozens of bugs which he fixed. Many of these
3215 bugs had perhaps never been hit by any users. But at least one was
3216 hit by the gnome-about program which resulted in dozens of duplicated
3217 bug reports against that program:
3219 http://bugzilla.gnome.org/show_bug.cgi?id=431990
3221 We were very pleasantly surprised to see this bug get fixed as a
3222 side-effect of Chris's work. Well done, Chris!
3226 Cleanup of mutex declarations (Behdad Esfahbod)
3228 Remove unnecessary clip region from SVG output (Emmanuel Pacaud)
3230 Remove Xsun from the buggy_repeat blacklist (Elaine Xiong)
3232 ATSUI: Fix glyph measurement: faster and more correct (Brian Ewins)
3234 Quartz: fixed 'extend' behaviour for patterns, improved pattern performance,
3235 and a few smaller correctness fixes. (Brian Ewins, Vladimir Vukicevic)
3237 Release 1.4.6 (2007-05-01 Carl Worth <cworth@cworth.org>)
3238 =========================================================
3239 This is the third update in cairo's stable 1.4 series. It comes a
3240 little less than three weeks since the 1.4.4 release. This release
3241 fixes the broken mutex initialization that made cairo 1.4.4 unusable
3242 on win32, OS/2, and BeOS systems. This release also adds significant
3243 improvements to cairo's PDF backend, (native gradients!), and a couple
3244 of performance optimizations, (one of which is very significant for
3245 users of the xlib backend). See below for more details.
3247 Repaired mutex initialization
3248 -----------------------------
3249 We apologize that cairo 1.4.4 did little more than crash on many
3250 platforms which are less-frequently used by the most regular cairo
3251 maintainers, (win32, OS/2, and BeOS). The mutex initialization
3252 problems that caused those crashes should be fixed now. And to avoid
3253 similar problems in the future, we've now started posting pre-release
3254 snapshots to get better testing, (subscribe to cairo@cairographics.org
3255 if you're interested in getting notified of those and testing them).
3259 Thanks to Adrian Johnson, (cairo PDF hacker extraordinaire), we have
3260 several improvements to cairo's PDF backend to announce:
3264 As of cairo 1.4.6, cairo will now generate native PDF gradients in
3265 many cases, (previously, the presence of a gradient on any page
3266 would force rasterized output for that page). Currently, only
3267 gradients with extend types of PAD (the default) or NONE will
3268 generate native PDF gradients---others will still trigger
3269 rasterization, (but look for support for other extend modes in a
3270 future release). Many thanks to Miklós Erdélyi as well, who did the
3271 initial work for this support.
3273 Better compatibility with PDF viewers:
3275 The PDF output from cairo should now be displayed correctly by a
3276 wider range of PDF viewers. Adrian tested cairo's PDF output against
3277 many PDF viewers, identified a common bug in many of those viewers
3278 (ignoring the CTM matrix in some cases), and modified cairo's output
3279 to avoid triggering that bugs (pre-transforming coordinates and
3280 using an identity matrix).
3282 Better OpenType/CFF subsetting:
3284 Cairo will now embed CFF and TrueType fonts as CID fonts.
3286 Performance optimizations
3287 -------------------------
3288 Faster cairo_paint_with_alpha:
3290 The cairo_paint_with_alpha call is used to apply a uniform alpha
3291 mask to a pattern. For example, it can be used to gradually fade an
3292 image out or in. Jeff Muizelaar fixed some missing/broken
3293 optimizations within the implementation of this function resulting
3294 in cairo_paint_with_alpha being up to 4 times faster when using
3295 cairo's image backend.
3297 Optimize rendering of "off-screen" geometry:
3299 Something that applications often do is to ask cairo to render
3300 things that are either partially or wholly outside the current clip
3301 region. Since 1.4.0 the image backend has been fixed to not waste
3302 too much time in this case. But other backends have still been
3305 In particular, the xlib backend has often performed quite badly in
3306 this situation. This is due to a bug in the implementation of
3307 trapezoid rasterization in many X servers.
3309 Now, in cairo 1.4.6 there is a higher-level fix for this
3310 situation. Cairo now eliminates or clips trapezoids that are wholly
3311 or partially outside the clip region before handing the trapezoids
3312 to the backend. This means that the X server's performance bug is
3313 avoided in almost all cases.
3315 The net result is that doing an extreme zoom-in of vector-based
3316 objects drawn with cairo might have previously brought the X server
3317 to its knees as it allocated buffers large enough to fit all of the
3318 geometry, (whether visible or not). But now the memory usage should
3319 be bounded and performance should be dramatically better.
3323 Behdad contributed an impressively long series of changes that
3324 organizes cairo's internals in several ways that will be very
3325 beneficial to cairo developers. Thanks, Behdad!
3327 Behdad has also provided a utility for generating malloc statistics,
3328 (which was used during the great malloc purges of 1.4.2 and
3329 1.4.4). This utility isn't specific to cairo so may be of benefit to
3330 others. It is found in cairo/util/malloc-stats.c and here are Behdad's
3335 make malloc-stats.so
3337 inside util/, and to use, run:
3339 LD_PRELOAD=malloc-stats.so some-program
3341 For binaries managed by libtool, eg, cairo-perf, do:
3343 ../libtool --mode=execute /bin/true ./cairo-perf
3344 LD_PRELOAD="../util/malloc-stats.so" .libs/lt-cairo-perf
3346 Finally, the cairo-perf-diff-files utility was enhanced to allow for
3347 generating performance reports from several runs of the same backend
3348 while some system variables were changed. For example, this is now
3349 being used to allow cairo-perf to measure the performance of various
3350 different acceleration architectures and configuration options of the
3353 Release 1.4.4 (2007-04-13 Carl Worth <cworth@cworth.org>)
3354 =========================================================
3355 This is the second update release in cairo's stable 1.4 series. It
3356 comes just less than a month after 1.4.2. The changes since 1.4.2
3357 consist primarily of bug fixes, but also include at least one
3358 optimization. See below for details.
3360 Of all the work that went into the 1.4.4 release
3362 There have been lots of individuals doing lots of great work on cairo,
3363 but two efforts during the 1.4.4 series deserve particular mention:
3365 Internal cleanup of error handling, (Chris Wilson)
3366 --------------------------------------------------
3367 Chris contributed a tremendous series of patches (74 patches!) to
3368 improve cairo's handling of out-of-memory and other errors. He began
3369 by adding gcc's warn_unused_attribute to as many functions as
3370 possible, and then launched into the ambitious efforts of adding
3371 correct code to quiet the dozens of resulting warnings.
3373 Chris also wrote a custom valgrind skin to systematically inject
3374 malloc failures into cairo, and did all the work necessary to verify
3375 that cairo's performance test suite runs to completion without
3378 The end result is a much more robust implementation. Previously, many
3379 error conditions would have gone unnoticed and would have led to
3380 assertion failures, segmentation faults, or other harder-to-diagnose
3381 problems. Now, more than ever, cairo should cleanly let the user know
3382 of problems through cairo_status and other similar status
3383 functions. Well done, Chris!
3385 More malloc reduction, (Mathias Hasselmann)
3386 -------------------------------------------
3387 After 1.4.0, Behdad launched an effort to chase down excessive calls
3388 to malloc within the implementation of cairo. He fixed a lot of
3389 malloc-happy objects for 1.4.2, but one of the worst offenders,
3390 (pixman regions), was left around. Mathias contributed an excellent
3391 series of 15 patches to finish off this effort.
3393 The end result is a cairo that calls malloc much less often than it
3394 did before. Compared to 1.4.2, 55% of the calls to malloc have been
3395 eliminate, (and 60% have been eliminated compared to 1.4.0). Well
3398 Other improvements since 1.4.2
3399 ------------------------------
3400 • Centralize mutex declarations (will reduce future build breaks),
3401 (Mathias Hasselmann)
3403 • Reduce malloc by caching recently freed pattern objects (Chris
3406 • Fix some broken composite operations (David Reveman)
3407 https://bugs.freedesktop.org/show_bug.cgi?id=5777
3409 Backend-specific fixes
3410 ----------------------
3412 • Use TJ operator for more compact representation of glyphs (Adrian
3415 • Fix glyph positioning bug when glyphs are not horizontal
3416 http://lists.freedesktop.org/archives/cairo/2007-April/010337.html
3419 • Fix crash when rendering with bitmap fonts (Carl Worth)
3420 https://bugzilla.mozilla.org/show_bug.cgi?id=376498
3423 • Turn metrics-hinting on by default (Behdad Esfahbod)
3425 • Fix edge-effect problem with transformed images drawn to xlib
3427 https://bugs.freedesktop.org/show_bug.cgi?id=10508
3429 • Avoid dereferencing a NULL screen. (Chris Wilson)
3430 https://bugs.freedesktop.org/show_bug.cgi?id=10517
3433 • Fix scaling of glyph surfaces
3435 https://bugs.freedesktop.org/show_bug.cgi?id=9568
3437 • Fix compilation failure when both xlib and quartz enabled
3440 • Fix rounding bug leading to incorrectly positioned glyphs
3442 https://bugs.freedesktop.org/show_bug.cgi?id=10531
3444 Release 1.4.2 (2007-03-19 Carl Worth <cworth@cworth.org>)
3445 =========================================================
3446 This is the first update release in cairo's stable 1.4 series. It
3447 comes just less than 2 weeks after 1.4.0. We hadn't anticipated an
3448 update this early, but we've managed to collect some important fixes
3449 that we wanted to get out to cairo users as soon as possible, (6 fixes
3450 for crashes, 1 case where graphical elements would not be drawn at
3451 all, a handful of backend-specific bugs, and several important build
3454 There's almost nothing but bug fixes in this release, (see below one
3455 optimization that Behdad did sneak in), so we recommend that everyone
3456 upgrade to this release when possible.
3458 Thanks to the many people that worked to fix these bugs, and those
3459 that did the work to report them and to test the fixes, (wherever
3460 possible both names are credited below).
3464 • Fix a crash due to a LOCK vs. UNLOCK typo (M. Drochner fixing Carl
3465 Worth's embarrassing typo).
3467 http://bugs.freedesktop.org/show_bug.cgi?id=10235
3469 • Fix potential buffer overflow, which on some systems with a checking
3470 variant of snprintf would lead to a crash (Adrian Johnson, Stanislav
3473 https://bugs.freedesktop.org/show_bug.cgi?id=10267
3474 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=232576
3476 • Fix a crash in cairo_stroke_extents or cairo_in_stroke when line
3477 width is 0.0. (Carl Worth and Sebastien Bacher)
3479 https://bugs.freedesktop.org/show_bug.cgi?id=10231
3481 • Fix a crash on certain combinations of X server/video drivers (Carl
3482 Worth and Tomas Carnecky).
3484 https://bugs.freedesktop.org/show_bug.cgi?id=10250
3486 • Fix a crash due to mishandling of invalid user input (Carl Worth and
3487 Alexander Darovsky).
3489 https://bugs.freedesktop.org/show_bug.cgi?id=9844
3491 • xlib: Cleanup server-side glyph caches on XCloseDisplay. This
3492 eliminated a crash detected by the perf suite, (and that
3493 applications could have run into as well). (Chris Wilson)
3497 • Fix for some geometry which simply disappeared under some
3498 transformations---a stroked line with an extreme skew in X, for
3499 example (Carl Worth and Jonathan Watt).
3501 https://bugzilla.mozilla.org/show_bug.cgi?id=373632
3503 • SVG: Fix radial gradients for CAIRO_EXTEND_REFLECT and when r0 > r1
3506 • PDF: Set page group color space to DeviceRGB.
3508 This fixes incorrect (muddy) transparent colors when rendering cairo
3509 PDF output in some viewers. (Adrian Johnson, Adam Goode, and
3512 http://lists.freedesktop.org/archives/cairo/2006-November/008551.html
3514 • win32: Return correct metrics when hinting is off, and fix font
3515 descent computation (Behdad Esfahbod).
3517 • quartz: Fix glyph interfaces to correctly return user-space rather
3518 than device-space coordinates (Brian Ewins).
3520 https://bugs.freedesktop.org/show_bug.cgi?id=9568
3522 • xcb: Fix parameter-order confusion with xcb_create_pixmap, which now
3523 makes all tests that pass with xlib now pass with xcb (Carl Worth,
3526 • Fix some memory leaks in the perf suite (Chris Wilson).
3528 • Fix perf suite to consider changes in pixman/src (Mathias
3533 • Don't include pre-generated cairo-features.h file. This was causing
3534 build failures when building with the directfb backend enabled
3537 https://bugs.freedesktop.org/show_bug.cgi?id=10189
3539 • Eliminate use of maintainer mode from cairo's automake/configure
3540 script. This means that updates to files such as Makefile.am will
3541 take effect, (by rerunning automake and friends as necessary) when
3542 invoking make rather than being silently ignored. (Behdad Esfahbod)
3544 • Don't compile cairo-deflate-stream.c, which depends on zlib, unless
3545 building the pdf backend which requires it. (Carl Worth, Tor
3548 https://bugs.freedesktop.org/show_bug.cgi?id=10202
3550 • Don't make the ps backend link against zlib anymore, since it
3551 doesn't require it (Carl Worth).
3553 • Use "find !" rather than "find -not" for better portability (Thomas
3556 https://bugs.freedesktop.org/show_bug.cgi?id=10226
3558 • Don't use unsupported visibility attribute "hidden" on Solaris
3559 (Gilles Dauphin, Thomas Klausner).
3561 https://bugs.freedesktop.org/show_bug.cgi?id=10227
3565 • It was Behdad that suggested we focus strictly on bug fixes now that
3566 we shipped so many performance improvements in 1.4.0, but it was
3567 also Behdad that got distracted by the chance to remove a lot of
3568 mallocs from cairo. Paths, gstates, trapezoids, splines, polygons,
3569 and gradient color stops will now use small, stack-allocated buffers
3570 in the most common cases rather than calling malloc as
3571 often. (Behdad Esfahbod). And look for more from Mathias Hasselmann
3574 Release 1.4.0 (2007-03-06 Carl Worth <cworth@cworth.org>)
3575 =========================================================
3576 The many people[*] who have been working hard on cairo are very
3577 pleased to announce the long-awaited release of cairo 1.4. This
3578 release comes 4 months after the last stable update release (1.2.6)
3579 and 9 months since the initial release of 1.2.0.
3581 The release notes below are intended to capture the highlights of the
3582 changes that have occurred from the 1.2 series to the new 1.4.0
3585 Performance improvements
3586 ------------------------
3587 Within the cairo project, the last 6 months or so has seen an intense
3588 effort focusing on the performance of cairo itself. That effort has
3589 paid off considerably, as can be seen in the following highlights of
3590 some of the performance differences from cairo 1.2.6 to cairo 1.4.0.
3592 (Note: The performance results reported here were measured on an x86
3593 laptop. Many of the improvements in 1.4---particular those involving
3594 text rendering---are even more dramatic on embedded platforms without
3595 hardware floating-point units. Such devices played an important part
3596 of many of the optimizations that found their way into cairo over the
3599 • Dramatic improvement when drawing objects that are mostly off-screen
3600 with the image backend (with the xlib backend this case is still
3601 slow due to an X server bug):
3603 image-rgba long-lines-uncropped-100 479.64 -> 4.98: 96.24x speedup
3604 ███████████████████████████████████████████████▋
3606 • Dramatic improvement when copying a small fraction of an image
3607 surface to an xlib surface:
3609 xlib-rgba subimage_copy-512 3.93 -> 0.07: 54.52x speedup
3610 ██████████████████████████▊
3612 • Dramatic improvement to tessellation speed for complex objects:
3614 image-rgb tessellate-256-100 874.16 -> 34.79: 25.13x speedup
3616 xlib-rgba zrusin_another_fill-415 148.40 -> 13.85: 10.72x speedup
3618 xlib-rgb world_map-800 680.20 -> 345.54: 1.97x speedup
3621 • Dramatic improvement to the speed of stroking rectilinear shapes,
3622 (such as the outline of a rectangle or "box"):
3624 image-rgb box-outline-stroke-100 0.18 -> 0.01: 24.22x speedup
3626 xlib-rgb box-outline-stroke-100 0.46 -> 0.06: 8.05x speedup
3630 • Dramatic improvements to text rendering speeds:
3632 xlib-rgba text_image_rgba_over-256 63.12 -> 9.61: 6.57x speedup
3635 • 3x improvements to floating-point to fixed-point conversion speeds:
3637 image-rgba pattern_create_radial-16 9.29 -> 3.44: 2.70x speedup
3640 • 2x improvements to linear gradient computation:
3642 image-rgb paint_linear_rgb_source-512 26.22 -> 11.61: 2.26x speedup
3645 • 2x improvement to a case common in PDF rendering:
3647 image-rgb unaligned_clip-100 0.10 -> 0.06: 1.81x speedup
3650 • 1.3x improvement to rectangle filling speed (note: this improvement
3651 is new since 1.3.16---previously this test case was a 1.3x slowdown
3654 image-rgba rectangles-512 6.19 -> 4.37: 1.42x speedup
3656 xlib-rgba rectangles-512 7.48 -> 5.58: 1.34x speedup
3659 NOTE: In spite of our best efforts, there are some measurable
3660 performance regressions in 1.4 compared to 1.2. It appears that the
3661 primary problem is the increased overhead of the new tessellator when
3662 drawing many, very simple shapes. The following test cases capture
3663 some of that slowdown:
3665 image-rgba mosaic_tessellate_lines-800 11.03 -> 14.29: 1.30x slowdown
3667 image-rgba box-outline-fill-100 0.01 -> 0.01: 1.26x slowdown
3669 image-rgba fill_solid_rgb_over-64 0.20 -> 0.22: 1.12x slowdown
3671 image-rgba fill_image_rgba_over-64 0.23 -> 0.25: 1.10x slowdown
3673 xlib-rgb paint_image_rgba_source-256 3.24 -> 3.47: 1.07x slowdown
3675 We did put some special effort into eliminating this slowdown for the
3676 very common case of drawing axis-aligned rectangles with an identity
3677 matrix (see the box-outline-stroke and rectangles speedup numbers
3678 above). Eliminating the rest of this slowdown will be a worthwhile
3679 project going forward.
3681 Also note that the "box-outline-fill" case is a slowdown while
3682 "box-outline-stroke" is a (huge) speedup. These two test cases
3683 resulted from the fact that some GTK+ theme authors were filling
3684 between two rectangles to avoid slow performance from the more natural
3685 means of achieving the same shape by stroking a single rectangle. With
3686 1.4 that workaround should definitely be eliminated as it will now
3687 cause things to perform more slowly.
3689 Greatly improved PDF output
3690 ---------------------------
3691 We are very happy to be able to announce that cairo-generated PDF
3692 output will now have text that can be selected, cut-and-pasted, and
3693 searched with most capable PDF viewer applications. This is something
3694 that was not ever possible with cairo 1.2.
3696 Also, the PDF output now has much more compact encoding of text than
3697 before. Cairo is now much more careful to not embed multiple copies of
3698 the same font at different sizes. It also compresses text and font
3699 streams within the PDF output.
3703 There are several new functions available in 1.4 that were not
3704 available in 1.2. Curiously, almost all of the new functions simply
3705 allow the user to query state that has been set in cairo (many new
3706 "get" functions) rather than providing any fundamentally new
3707 operations. The new functionality is:
3709 • Getting information about the current clip region
3712 cairo_copy_clip_rectangle_list
3713 cairo_rectangle_list_destroy
3715 • Getting information about the current dash setting
3717 cairo_get_dash_count
3720 • Getting information from a pattern
3722 cairo_pattern_get_rgba
3723 cairo_pattern_get_surface
3724 cairo_pattern_get_color_stop_rgba
3725 cairo_pattern_get_color_stop_count
3726 cairo_pattern_get_linear_points
3727 cairo_pattern_get_radial_circles
3729 • Getting the current scaled font
3731 cairo_get_scaled_font
3733 • Getting reference counts
3735 cairo_get_reference_count
3736 cairo_surface_get_reference_count
3737 cairo_pattern_get_reference_count
3738 cairo_font_face_get_reference_count
3739 cairo_scaled_font_get_reference_count
3741 • Setting/getting user data on objects
3745 cairo_pattern_set_user_data
3746 cairo_pattern_get_user_data
3747 cairo_scaled_font_set_user_data
3748 cairo_scaled_font_get_user_data
3750 • New cairo-win32 functions:
3752 cairo_win32_surface_create_with_ddb
3753 cairo_win32_surface_get_image
3754 cairo_win32_scaled_font_get_logical_to_device
3755 cairo_win32_scaled_font_get_device_to_logical
3759 The CAIRO_FORMAT_RGB16_565 enum value has been deprecated. It never
3760 worked as a format value for cairo_image_surface_create, and it wasn't
3761 necessary for supporting 16-bit 565 X server visuals.
3763 A sampling of bug fixes in cairo 1.4
3764 ------------------------------------
3765 • Fixed radial gradients
3766 • Fixed dashing (degenerate and "leaky" cases)
3767 • Fixed transformed images in PDF/PS output (eliminate bogus repeating)
3768 • Eliminate errors from CAIRO_EXTEND_REFLECT and CAIRO_EXTEND_PAD
3769 • cairo_show_page no longer needed for single-page output
3770 • SVG: Fix bug preventing text from appearing in many viewers
3771 • cairo-ft: Return correct metrics when hinting is off
3772 • Eliminate crash in cairo_create_similar if nil surface is returned
3773 • Eliminate crash after INVALID_RESTORE error
3774 • Fix many bugs related to multi-threaded use and locking
3775 • Fix for glyph spacing 32 times larger than desired (cairo-win32)
3776 • Fixed several problems in cairo-atsui (assertion failures)
3777 • Fix PDF output to avoid problems when printing from Acrobat Reader
3778 • Fix segfault on Mac OS X (measuring a zero-length string)
3779 • Fix text extents to not include the size of non-inked characters
3780 • Fix for glyph cache race condition in glitz backend (Jinghua Luo)
3781 • Fix make check to work on OPD platforms (IA64 or PPC64)
3782 • Fix compilation problems of cairo "wideint" code on some platforms
3783 • Many, many others...
3785 Experimental backends (quartz, XCB, OS/2, BeOS, directfb)
3786 ---------------------------------------------------------
3787 None of cairo's experimental backends are graduating to "supported"
3788 status with 1.4.0, but two of them in particular (quartz and xcb), are
3791 The quartz baceknd has been entirely rewritten and is now much more
3792 efficient. The XCB backend has been updated to track the latest XCB
3793 API (which recently had a 1.0 release).
3795 We hope to see these backends become supported in a future release,
3796 (once they are passing all the tests in cairo's test suite).
3798 The experimental OS/2 backend is new in cairo 1.4 compared to cairo
3801 Documentation improvements
3802 --------------------------
3803 We have added documentation for several functions and types that
3804 were previously undocumented, and improved documentation on other
3805 ones. As of this release, there remain only two undocumented
3806 symbols: cairo_filter_t and cairo_operator_t.
3808 [*]Thanks to everyone
3809 ---------------------
3810 I've accounted for 41 distinct people with attributed code added to
3811 cairo between 1.2.6 and 1.4.0, (their names are below). That's an
3812 impressive number, but there are certainly dozens more that
3813 contributed with testing, suggestions, clarifying questions, and
3814 encouragement. I'm grateful for the friendships that have developed as
3815 we have worked on cairo together. Thanks to everyone for making this
3818 Adrian Johnson, Alfred Peng, Alp Toker, Behdad Esfahbod,
3819 Benjamin Otte, Brian Ewins, Carl Worth, Christian Biesinger,
3820 Christopher (Monty) Montgomery, Daniel Amelang, Dan Williams,
3821 Dave Yeo, David Turner, Emmanuel Pacaud, Eugeniy Meshcheryakov,
3822 Frederic Crozat, Hans Breuer, Ian Osgood, Jamey Sharp, Jeff Muizelaar,
3823 Jeff Smith, Jinghua Luo, Jonathan Watt, Joonas Pihlaja, Jorn Baayen,
3824 Kalle Vahlman, Kjartan Maraas, Kristian Høgsberg, M Joonas Pihlaja,
3825 Mathias Hasselmann, Mathieu Lacage, Michael Emmel, Nicholas Miell,
3826 Pavel Roskin, Peter Weilbacher, Robert O'Callahan,
3827 Soren Sandmann Pedersen, Stuart Parmenter, T Rowley,
3830 Snapshot 1.3.16 (2007-03-02 Carl Worth <cworth@cworth.org>)
3831 ===========================================================
3834 A few new public functions have been added to the cairo API since the
3835 1.3.14 snapshot. These include a function to query the current scaled
3838 cairo_get_scaled_font
3840 New functions to query the reference count of all cairo objects:
3842 cairo_get_reference_count
3844 cairo_surface_get_reference_count
3845 cairo_pattern_get_reference_count
3847 cairo_font_face_get_reference_count
3848 cairo_scaled_font_get_reference_count
3850 And new functions to allow the use of user_data with any cairo object,
3851 (previously these were only available on cairo_surface_t and
3852 cairo_font_face_t objects):
3857 cairo_pattern_set_user_data
3858 cairo_pattern_get_user_data
3860 cairo_scaled_font_set_user_data
3861 cairo_scaled_font_get_user_data
3863 Usability improvement for PDF/PS/SVG generation
3864 -----------------------------------------------
3865 In previous versions of cairo, generating single-page output with the
3866 cairo-pdf, cairo-ps, or cairo-svg backends required a final call to
3867 cairo_show_page. This was often quite confusing as people would port
3868 functional code from a non-paginated backend and be totally mystified
3869 as to why the output was blank until they learned to add this call.
3871 Now that call to cairo_show_page is optional, (it will be generated
3872 implicitly if the user does not call it). So cairo_show_page is only
3873 needed to explicitly separate multiple pages.
3875 Greatly improved PDF output
3876 ---------------------------
3877 We are very happy to be able to announce that cairo-generated PDF
3878 output will now have text that can be selected, cut-and-paste, and
3879 searched with most capable PDF viewer applications. This is something
3880 that was not ever possible with cairo 1.2.
3882 Also, the PDF output now has much more compact encoding of text than
3883 before. Cairo is now much more careful to not embed multiple copies of
3884 the same font at different sizes. It also compresses text and font
3885 streams within the PDF output.
3889 • Fixed radial gradients
3891 The rendering of radial gradients has been greatly improved. In
3892 the cairo 1.2 series, there was a serious regression affecting
3893 radial gradients---results would be very incorrect unless one of
3894 the gradient circles had a radius of 0.0 and a center point within
3895 the other circle. These bugs have now been fixed.
3899 Several fixes have been made to the implementation of dashed
3900 stroking. Previously, some dashed, stroked rectangles would
3901 mis-render and fill half of the rectangle with a large triangular
3902 shape. This bug has now been fixed.
3904 • Fixed transformed images in PDF/PS output
3906 In previous versions of cairo, painting with an image-based source
3907 surface pattern to the PDF or PS backends would cause many kinds
3908 of incorrect results. One of the most common problems was that an
3909 image would be repeated many times even when the user had
3910 explicitly requested no repetition with CAIRO_EXTEND_NONE. These
3911 bugs have now been fixed.
3913 • Eliminate errors from CAIRO_EXTEND_REFLECT and CAIRO_EXTEND_PAD
3915 In the 1.2 version of cairo any use of CAIRO_EXTEND_REFLECT or
3916 CAIRO_EXTEND_PAD with a surface-based pattern resulted in an
3917 error, (cairo would stop rendering). This bug has now been
3920 Now, CAIRO_EXTEND_REFLECT should work properly with surface
3923 CAIRO_EXTEND_PAD is still not working correctly, but it will now
3924 simply behave as CAIRO_EXTEND_NONE rather than triggering the
3927 New rewrite of quartz backend (still experimental)
3928 --------------------------------------------------
3929 Cairo's quartz backend has been entirely rewritten and is now much
3930 more efficient. This backend is still marked as experimental, not
3931 supported, but it is now much closer to becoming an officially
3932 supported backend. (For people that used the experimental nquartz
3933 backend in previous snapshots, that implementation has now been
3934 renamed from "nquartz" to "quartz" and has replaced the old quartz
3937 Documentation improvements
3938 --------------------------
3939 We have added documentation for several functions and types that
3940 were previously undocumented, and improved documentation on other
3941 ones. As of this release, there remain only two undocumented
3942 symbols: cairo_filter_t and cairo_operator_t.
3946 • cairo-svg: Fix bug that was preventing text from appearing in many
3949 • cairo-ft: Return correct metrics when hinting is off
3951 • Cairo 1.3.14 deadlocks in cairo_scaled_font_glyph_extents or
3952 _cairo_ft_unscaled_font_lock_face
3954 https://bugs.freedesktop.org/show_bug.cgi?id=10035
3956 • cairo crashes in cairo_create_similar if nil surface returned by
3957 other->backend->create_similar
3959 https://bugs.freedesktop.org/show_bug.cgi?id=9844
3961 • evolution crash in _cairo_gstate_backend_to_user()
3962 https://bugs.freedesktop.org/show_bug.cgi?id=9906
3964 • Fix memory leak in rectilinear stroking code
3966 Things not in this release
3967 --------------------------
3968 • Solid-surface-pattern cache: This patch had been applied during
3969 the 1.3.x series, but it was reverted due to some inter-thread
3970 problems it caused. The patch is interesting since it made a big
3971 benefit for text rendering performance---so we'll work to bring a
3972 corrected version of this patch back as soon as possible.
3974 Snapshot 1.3.14 (2006-02-13 Carl Worth <cworth@cworth.org>)
3975 ===========================================================
3976 This is the seventh development snapshot in the 1.3 series, (and there
3977 likely won't be many more before the 1.4.0 release). It comes just
3978 over 3 weeks after the 1.3.12 snapshot.
3980 Since we're so close to the 1.4.0 release, there are not a lot of new
3981 features nor even a lot of new performance improvements in this
3982 snapshot. Instead, there are a great number of bug fixes. Some are
3983 long-standing bugs that we're glad to say goodbye to, and several are
3984 fixes for regressions that were introduced as part of the optimization
3985 efforts during the 1.3.x series.
3987 PDF text selection fixed
3988 ------------------------
3989 The inability to correctly select text in cairo-generated PDF has been
3990 a defect ever since the initial support for the PDF backend in the
3991 cairo 1.2.0 release. With the 1.3.14 snapshot, in most situations, and
3992 with most PDF viewer applications, the PDF generated by cairo will
3993 allow text to be correctly selected for copy-and-paste, (as well as
3996 We're very excited about this new functionality, (and very grateful to
3997 Adrian Johnson, Behdad Esfahbod, and others that have put a lot of
3998 work into this lately). Please test this new ability and give feedback
3999 on the cairo@cairographics.org list.
4001 Many thread-safety issues fixed
4002 -------------------------------
4003 We've discovered that no release of cairo has ever provided safe text
4004 rendering from a multi-threaded application. With the 1.3.14 snapshot
4005 a huge number of the bugs in this area have been fixed, and multiple
4006 application dvelopers have now reported success at writing
4007 multi-threaded applications with cairo.
4011 Fixed a bug that was causing glyph spacing to be 32 times larger than
4012 desired when using cairo-win32.
4014 Fixed a regression in the rendering of linear gradients that had been
4015 present since the 1.3.8 snapshot.
4017 Fixed several problems in cairo-atsui that were leading to assertion
4018 failures when rendering text.
4020 Fix corrupted results when rendering a transformed source image
4021 surface to an xlib surface. This was a regression that had been
4022 present since the 1.3.2 snapshot.
4024 Fixed PDF output to prevent problems printing from some versions of
4025 Acrobat Reader, (a single glyph was being substituted for every
4028 And many other fixes as well, (see the logs for details).
4030 Snapshot 1.3.12 (2007-01-20 Carl Worth <cworth@cworth.org>)
4031 ===========================================================
4032 The relentless march toward the cairo 1.4 release continues, (even if
4033 slightly late out of the starting blocks in 2007). This is the sixth
4034 development snapshot in the 1.3 series. It comes 4 weeks after the
4039 As usual, this snapshot has some fun performance improvements to show
4042 image-rgba long-lines-uncropped-100 470.08 -> 4.95: 94.91x speedup
4043 ███████████████████████████████████████████████
4044 image-rgb long-lines-uncropped-100 461.60 -> 4.96: 93.02x speedup
4045 ██████████████████████████████████████████████
4047 This 100x improvement, (and yes, that's 100x, not 100%), in the image
4048 backend occurs when drawing large shapes where only a fraction of the
4049 shape actually appears in the final result, (the rest being outside
4050 the bounds of the destination surface). Many applications should see
4051 speedups here, and the actual amount of speedup depends on the ratio
4052 of non-visible to visible portions of geometry.
4054 [Note: There remains a similar performance bug when drawing mostly
4055 non-visible objects with the xlib backend. This is due to a similar
4056 bug in the X server itself, but we hope a future cairo snapshot will
4057 workaround that bug to get a similar speedup with the xlib backend.]
4059 image-rgba unaligned_clip-100 0.09 -> 0.06: 1.67x speedup
4061 image-rgb unaligned_clip-100 0.09 -> 0.06: 1.66x speedup
4064 This speedup is due to further MMX optimization by Soeren Sandmann for
4065 a case commonly hit when rendering PDF files, (and thanks to Jeff
4066 Muizelaar for writing code to extract the test case for us).
4068 There's another MMX optimization in this snapshot (without a fancy
4069 speedup chart) by Dan Williams which improves compositing performance
4070 specifically for the OLPC machine.
4072 Thanks to Adrian Johnson, cairo's PDF output is now much more
4073 efficient in the way it encodes text output. By reducing redundant
4074 information and adding compression to text output streams, Adrian
4075 achieved a ~25x improvement in the efficiency of encoding text in PDF
4076 files, (was ~45 bytes per glyph and is now ~1.6 bytes per glyph).
4080 In addition to those performance improvements, this snapshot includes
4083 * A huge number of bug fixes for cairo-atsui text rendering, (for mac
4084 OS X). These bugs affect font selection, glyph positioning, glyph
4085 rendering, etc. One noteworthy bug fixes is that
4086 cairo_select_font_face will no longer arbitrarily select bold nor
4087 italic when not requested, (at least not when using a standard CSS2
4088 font family name such as "serif", "sans-serif", "monospace", etc.).
4089 All these fixes are thanks to Brian Ewins who continues to do a
4090 great job as the new cairo-atsui maintainer.
4092 * Fix PDF output so that images that are scaled down no longer
4093 mysteriously repeat (Carl Worth).
4095 * Fix segfault on Mac OS X dues to attempt to measure extents of a
4096 zero-length string (Behdad Esfahbod).
4098 * Fix text extents to not include the size of initial/trailing
4099 non-inked characters (Behdad Esfahbod).
4103 Three functions have had API changes to improve consistency. Note that
4104 the API functions being changed here are all functions that were
4105 introduced as new functions during these 1.3.x snapshots. As always,
4106 there will not be any API changes to functions included in a major
4107 release (1.2.x, 1.4.x, etc.) of cairo.
4109 The changes are as follows:
4111 * Rename of cairo_copy_clip_rectangles to cairo_copy_clip_rectangle_list.
4113 * Change cairo_get_dash_count to return an int rather than accepting a
4114 pointer to an int for the return value.
4116 * Change cairo_get_dash to have a void return type rather than
4117 returning cairo_status_t.
4119 It's possible there will be one more round of changes to these
4120 functions, (and perhaps cairo_get_color_stop as well), as we seek to
4121 establish a unifying convention for returning lists of values.
4123 Snapshot 1.3.10 (2006-12-23 Carl Worth <cworth@cworth.org>)
4124 ===========================================================
4125 Santa Claus is coming just a little bit early this year, and he's
4126 bringing a shiny new cairo snapshot for all the good little boys and
4129 This is the fifth development snapshot in the 1.3 series. It comes 9
4130 days after the 1.3.8 snapshot, and still well within our goal of
4131 having a new snapshot every week, (though don't expect one next
4132 week---we'll all be too stuffed with sugar plums).
4134 Speaking of sugar plums, there's a sweet treat waiting in this cairo
4135 snapshot---greatly improved performance for stroking rectilinear
4136 shapes, like the ever common rectangle:
4138 image-rgb box-outline-stroke-100 0.18 -> 0.01: 25.58x speedup
4139 ████████████████████████▋
4140 image-rgba box-outline-stroke-100 0.18 -> 0.01: 25.57x speedup
4141 ████████████████████████▋
4142 xlib-rgb box-outline-stroke-100 0.49 -> 0.06: 8.67x speedup
4144 xlib-rgba box-outline-stroke-100 0.22 -> 0.04: 5.39x speedup
4147 In past releases of cairo, some people had noticed that using
4148 cairo_stroke to draw rectilinear shapes could be awfully slow. Many
4149 people had worked around this by using cairo_fill with a more complex
4150 path and gotten a 5-15x performance benefit from that.
4152 If you're one of those people, please rip that workaround out, as now
4153 the more natural use of cairo_stroke should be 1.2-2x faster than the
4154 unnatural use of cairo_fill.
4156 And if you hadn't ever implemented that workaround, then you just
4157 might get to see your stroked rectangles now get drawn 5-25x faster.
4159 Beyond that performance fix, there are a handful of bug fixes in this
4162 * Fix for glyph cache race condition in glitz backend (Jinghua Luo)
4164 * Many fixes for ATSUI text rendering (Brian Ewins)
4166 * Un-break recent optimization-triggered regression in rendering text
4167 with a translation in the font matrix (Behdad Esfahbod)
4169 * Fix make check to work on OPD platforms (IA64 or PPC64)
4172 * Fix a couple of character spacing issues on Windows
4175 Have fun with that, everybody, and we'll be back for more in the new
4176 year, (with a plan to add the last of our performance improvements in
4177 this round, fix a few bad, lingering bugs, and then finish off a nice,
4178 stable 1.4 release before the end of January).
4182 Snapshot 1.3.8 (2006-12-14 Carl Worth <cworth@cworth.org>)
4183 ==========================================================
4184 This is the fourth development snapshot in the 1.3 series. It comes
4185 just slightly more than one week after the 1.3.6 snapshot.
4187 After the bug fixes in 1.3.6, we're back to our original program of
4188 weekly snapshots, each one faster than the one from the week
4189 before. Cairo 1.3.8 brings a 2x improvement in the speed of rendering
4190 linear gradients (thanks to David Turner), and a significant reduction
4191 in X traffic when rendering text (thanks to Xan Lopez and Behdad
4192 Esfahbod), making cairo behave very much like Xft does.
4194 A few other things in the 1.3.8 snapshot worth noting include a more
4195 forgiving image comparator in the test suite, (using the "perceptual
4196 diff" metric and GPL implementation by Hector Yee[*]), a bug fix for
4197 broken linking on x86_64 (thanks to M Joonas Pihlaja) and an even
4198 better implementation of _cairo_lround, (not faster, but supporting a
4199 more complete input range), from Daniel Amelang.
4201 [*] http://pdiff.sourceforge.net/
4203 Snapshot 1.3.6 (2006-12-06 Carl Worth <cworth@cworth.org>)
4204 ==========================================================
4205 This is the third development snapshot in the 1.3 series. It comes two
4206 weeks after the 1.3.4 snapshot.
4208 We don't have fancy performance charts this week as the primary
4209 changes in this snapshot are bug fixes. The performance work continues
4210 and the next snapshot (planned for one week from today) should include
4211 several improvements. The bug fixes in this snapshot include:
4213 * Fix undesirable rounding in glyph positioning (Dan Amelang)
4215 This bug was noticed by several users, most commonly by seeing
4216 improper text spacing or scrambled glyphs as drawn by nautilus. For
4219 Update to cairo-1.3.4 worsen font rendering
4220 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=217819
4222 * Fix reduced range of valid input coordinates to tessellator
4225 This bug was causing lots of assertion failures in mozilla as
4228 CAIRO_BO_GUARD_BITS and coordinate space?
4229 http://lists.freedesktop.org/archives/cairo/2006-December/008743.html
4231 * Fix several regressions in new tessellator (M Joonas Pihlaja)
4233 Joonas just had a good eye for detail here. I don't think any
4234 external cairo users had noticed any of these bugs yet.
4236 * Fix compilation problems of cairo "wideint" code on some platforms
4239 * Fix failed configure due to broken grep (Dan Amelang)
4241 This bug was reported here:
4243 AX_C_FLOAT_WORDS_BIGENDIAN doesn't work because grep doesn't
4244 work with binary file
4245 https://bugs.freedesktop.org/show_bug.cgi?id=9124
4247 * Remove the pkg-config minimum version requirement (Behdad Esfahbod)
4249 Some systems ship with pkg-config 0.15 and there was really no good
4250 reason for cairo to insist on having version 0.19 before it would
4253 There is also one new (but inert) feature in this snapshot. There's a
4254 new option that can be passed to cairo's configure script:
4256 --disable-some-floating-point
4258 Disable certain code paths that rely heavily on double precision
4259 floating-point calculation. This option can improve
4260 performance on systems without a double precision floating-point
4261 unit, but might degrade performance on those that do.
4263 As of this snapshot, this option does not make any change to cairo,
4264 but it is possible that future versions of cairo will respect this
4265 option and change the implementation of various functions as
4268 Snapshot 1.3.4 (2006-11-22 Carl Worth <cworth@cworth.org>)
4269 ==========================================================
4270 This is the second development snapshot in the 1.3 series. It comes
4271 one week after the 1.3.2 snapshot.
4273 This snapshot has a couple of significant performance improvements,
4274 and also adds new support for producing multi-page SVG output, (when
4275 targeting SVG 1.2)---thanks to Emmanuel Pacaud. The details of the
4276 performance improvements are as follows:
4278 1. The long-awaited "new tessellator".
4280 The credit for this being an improvement goes to Joonas Pihlaja. He
4281 took my really slow code and really put it through its paces to get
4282 the dramatic performance improvement seen below (up to 38x faster
4283 on realistic cases, and more than 10x faster for the zrusin_another
4286 His own writeup of the work he did is quite thorough, but more than
4287 can be quoted here. Please see his post for the interesting details:
4289 http://lists.freedesktop.org/archives/cairo/2006-November/008483.html
4291 (Though note that this snapshot also includes some additional,
4292 significant improvements that were only sketched out in that
4293 email---see "Generating fewer trapezoids").
4295 2. More floating-point improvements
4297 Daniel Amelang continues to work the magic he began in the 1.3.2
4298 snapshot. This time he short-circuits floating-point
4299 transformations by identity matrices and applies the earlier
4300 floating-to-fixed-point technique to the problem of rounding.
4302 The improvements here will primarily benefit text performance, and
4303 will benefit platforms without hardware floating-point more than
4304 those that have it, (some text tests show 20% improvement on an x86
4305 machine and closer to 80% improvement on arm).
4307 The performance chart comparing 1.3.2 to 1.3.4 really speaks for
4308 itself, (this is on an x86 laptop). This is quite a lot of progress
4311 xlib-rgb stroke_similar_rgba_over-256 74.99 1.45% -> 2.03 68.38%: 36.86x speedup
4312 ███████████████████████████████████▉
4313 xlib-rgb stroke_similar_rgba_source-256 78.23 1.43% -> 3.30 67.05%: 23.71x speedup
4314 ██████████████████████▊
4315 xlib-rgba tessellate-256-100 820.42 0.15% -> 35.06 2.84%: 23.40x speedup
4316 ██████████████████████▍
4317 image-rgba tessellate-256-100 819.55 0.32% -> 35.04 3.56%: 23.39x speedup
4318 ██████████████████████▍
4319 xlib-rgb stroke_image_rgba_over-256 78.10 1.43% -> 4.33 65.56%: 18.04x speedup
4321 xlib-rgb stroke_image_rgba_source-256 80.11 1.63% -> 5.75 63.99%: 13.94x speedup
4323 xlib-rgba zrusin_another_tessellate-415 89.22 0.35% -> 8.38 5.23%: 10.65x speedup
4325 image-rgba zrusin_another_tessellate-415 87.38 0.89% -> 8.37 5.22%: 10.44x speedup
4327 image-rgba zrusin_another_fill-415 117.67 1.34% -> 12.88 2.77%: 9.14x speedup
4329 xlib-rgba zrusin_another_fill-415 140.52 1.57% -> 15.79 2.88%: 8.90x speedup
4331 image-rgba tessellate-64-100 9.68 3.42% -> 1.42 0.60%: 6.82x speedup
4333 xlib-rgba tessellate-64-100 9.78 4.35% -> 1.45 0.83%: 6.72x speedup
4335 xlib-rgb stroke_linear_rgba_over-256 46.01 2.44% -> 7.74 54.51%: 5.94x speedup
4337 xlib-rgb stroke_linear_rgba_source-256 48.09 2.15% -> 9.14 53.00%: 5.26x speedup
4339 xlib-rgb stroke_radial_rgba_over-256 50.96 2.34% -> 12.46 47.99%: 4.09x speedup
4341 xlib-rgb stroke_radial_rgba_source-256 53.06 1.57% -> 13.96 46.57%: 3.80x speedup
4343 image-rgba paint_similar_rgba_source-256 0.12 1.57% -> 0.08 9.92%: 1.42x speedup
4345 image-rgba paint_image_rgba_source-256 0.12 2.49% -> 0.08 10.70%: 1.41x speedup
4347 image-rgba world_map-800 356.28 0.46% -> 275.72 1.15%: 1.29x speedup
4349 xlib-rgba world_map-800 456.81 0.39% -> 357.95 1.39%: 1.28x speedup
4351 image-rgb tessellate-16-100 0.09 0.57% -> 0.07 3.43%: 1.23x speedup
4353 image-rgba tessellate-16-100 0.09 0.06% -> 0.07 2.46%: 1.23x speedup
4355 image-rgba text_solid_rgb_over-256 5.39 4.01% -> 4.47 0.70%: 1.21x speedup
4357 image-rgba text_solid_rgba_over-256 5.37 0.82% -> 4.45 0.75%: 1.21x speedup
4359 image-rgba text_image_rgb_over-64 0.78 0.10% -> 0.65 0.74%: 1.20x speedup
4361 image-rgba text_image_rgba_over-64 0.78 0.29% -> 0.65 0.68%: 1.19x speedup
4363 image-rgb text_solid_rgb_over-64 0.76 2.45% -> 0.63 0.81%: 1.19x speedup
4365 image-rgba text_solid_rgba_over-64 0.76 0.33% -> 0.64 0.66%: 1.19x speedup
4367 image-rgba text_similar_rgba_over-256 5.99 4.72% -> 5.04 1.09%: 1.19x speedup
4370 We should point out that there is some potential for slowdown in this
4371 snapshot. The following are the worst slowdowns reported by the cairo
4372 performance suite when comparing 1.3.2 to 1.3.4:
4374 image-rgba subimage_copy-256 0.01 0.87% -> 0.01 3.61%: 1.45x slowdown
4376 xlib-rgb paint_solid_rgb_over-256 0.31 10.23% -> 0.38 0.33%: 1.26x slowdown
4378 image-rgba box-outline-fill-100 0.01 0.30% -> 0.01 2.52%: 1.21x slowdown
4380 image-rgba fill_solid_rgb_over-64 0.20 1.22% -> 0.22 1.59%: 1.12x slowdown
4382 image-rgb fill_similar_rgb_over-64 0.21 1.04% -> 0.24 1.06%: 1.11x slowdown
4384 image-rgba fill_image_rgb_over-64 0.21 1.19% -> 0.24 0.72%: 1.11x slowdown
4386 image-rgba fill_similar_rgb_over-64 0.21 0.18% -> 0.24 0.30%: 1.11x slowdown
4388 image-rgb fill_solid_rgba_over-64 0.22 1.66% -> 0.24 1.15%: 1.11x slowdown
4390 image-rgb fill_image_rgb_over-64 0.21 0.14% -> 0.24 0.80%: 1.11x slowdown
4392 image-rgba fill_image_rgba_over-64 0.22 1.34% -> 0.25 0.20%: 1.11x slowdown
4394 image-rgba fill_solid_rgba_over-64 0.22 1.48% -> 0.24 0.95%: 1.11x slowdown
4396 image-rgb fill_similar_rgba_over-64 0.22 1.13% -> 0.25 1.25%: 1.10x slowdown
4399 The 45% slowdown for subimage_copy is an extreme case. It's unlikely
4400 to hit many applications unless they often use cairo_rectangle;
4401 cairo_fill to copy a single pixel at a time. In any case, it shows a
4402 worst-case impact of the overhead of the new tessellator. The other
4403 slowdowns (~ 10%) are probably more realistic, and still very
4406 We will work to ensure that performance regressions like these are not
4407 present from one major release of cairo to the next, (for example,
4410 But we're putting this 1.3.4 snapshot out there now, even with this
4411 potential slowdown so that people can experiment with it. If you've
4412 got complex geometry, we hope you will see some benefit from the new
4413 tessellator. If you've got primarily simple geometry, we hope things
4414 won't slowdown too much, but please let us know what slowdown you see,
4415 if any, so we can calibrate our performance suite against real-world
4418 Thanks, and have fun with cairo!
4420 Snapshot 1.3.2 (2006-11-14 Carl Worth <cworth@cworth.org>)
4421 ==========================================================
4422 This is the first development snapshot since the 1.2 stable series
4423 branched off shortly after the 1.2.4 release in August 2006.
4425 This snapshot includes all the bug fixes from the 1.2.6 release,
4426 (since they originated here on the 1.3 branch first and were
4427 cherry-picked over to 1.2). But more importantly, it contains some new
4428 API in preparation for a future 1.4 release, and most importantly, it
4429 contains several performance improvements.
4431 The bug fixes will not be reviewed here, as most of them are already
4432 described in the 1.2.6 release notes. But details for the new API and
4433 some performance improvements are included here.
4435 As with all snapshots, this is experimental code, and the new API
4436 added here is still experimental and is not guaranteed to appear
4437 unchanged in any future release of cairo.
4441 Several new API additions are available in this release. There is a
4442 common theme among all the additions in that they allow cairo to
4443 advertise information about its state that it was refusing to
4444 volunteer earlier. So this isn't groundbreaking new functionality, but
4445 it is essential for easily achieving several tasks.
4447 The new functions can be divided into three categories:
4449 Getting information about the current clip region
4450 -------------------------------------------------
4452 cairo_copy_clip_rectangles
4453 cairo_rectangle_list_destroy
4455 Getting information about the current dash setting
4456 --------------------------------------------------
4457 cairo_get_dash_count
4460 Getting information from a pattern
4461 ----------------------------------
4462 cairo_pattern_get_rgba
4463 cairo_pattern_get_surface
4464 cairo_pattern_get_color_stop_rgba
4465 cairo_pattern_get_color_stop_count
4466 cairo_pattern_get_linear_points
4467 cairo_pattern_get_radial_circles
4469 In each of these areas, we have new API for providing a list of
4470 uniform values from cairo. The closest thing we had to this before was
4471 cairo_copy_path, (which is rather unique in providing a list of
4474 The copy_clip_rectangles/rectangle_list_destroy functions follow a
4475 style similar to that of cairo_copy_path. Meanwhile, the dash and
4476 pattern color stop functions introduce a new style in which there is a
4477 single call to return the number of elements available (get_dash_count
4478 and get_color_stop_count) and then a function to be called once to get
4479 each element (get_dash and get_color_stop_rgba).
4481 I'm interested in hearing feedback from users of these new API
4482 functions, particularly from people writing language bindings. One
4483 open question is whether the clip "getter" functionality should adopt
4484 a style similar to that of the new dash and color_stop interfaces.
4488 The CAIRO_FORMAT_RGB16_565 enum value has been deprecated. It never
4489 worked as a format value for cairo_image_surface_create, and it wasn't
4490 necessary for supporting 16-bit 565 X server visuals.
4494 The XCB backend has been updated to track the latest XCB API (which
4495 recently had a 1.0 release).
4499 Vladimir Vukicevic has written a new "native quartz" backend which
4500 will eventually replace the current "image-surface wrapping" quartz
4501 backend. For now, both backends are available, (the old one is
4502 "quartz" and the new one is "nquartz"). But it is anticipated that the
4503 new backend will replace the old one and take on the "quartz" name
4504 before this backend is marked as supported in a release of cairo.
4508 Doodle and Peter Weilbacher have contributed a new, experimental
4509 backend for using cairo on OS/2 systems.
4511 Performance improvements
4512 ------------------------
4513 Here are some highlights from cairo's performance suite showing
4514 improvements from cairo 1.2.6 to cairo 1.3.2. The command used to
4515 generate this data is:
4517 ./cairo-perf-diff 1.2.6 HEAD
4519 available in the perf/ directory of a recent checkout of cairo's
4520 source, (the cairo-perf-diff script does require a git checkout and
4521 will not work from a tar file---though ./cairo-perf can still be used
4522 to generate a single report there and ./cairo-perf-diff-files can be
4523 used to compare two reports).
4525 Results are described below both for an x86 laptop (with an old Radeon
4526 video card, recent X.org build, XAA, free software drivers), as well
4527 as for a Nokia 770. First the x86 results with comments on each, (all
4528 times are reported in milliseconds).
4530 Copying subsets of an image surface to an xlib surface (much faster)
4531 --------------------------------------------------------------------
4532 xlib-rgba subimage_copy-512 10.50 -> : 53.97x speedup
4533 █████████████████████████████████████████████████████
4535 Thanks to Christopher (Monty) Montgomery for this big performance
4536 improvement. Any application which has a large image surface and is
4537 copying small pieces of it at a time to an xlib surface, (imagine an
4538 application that loads a single image containing all the "sprites" for
4539 that application), will benefit from this fix. The larger the ratio of
4540 the image surface to the portion being copied, the larger the benefit.
4542 Floating-point conversion (3x faster)
4543 -------------------------------------
4544 xlib-rgba pattern_create_radial-16 27.75 -> 3.93 : 2.94x speedup
4546 image-rgb pattern_create_radial-16 26.06 -> 3.74 : 2.90x speedup
4549 Thanks to Daniel Amelang, (and others who had contributed the idea
4550 earlier), for this nice improvement in the speed of converting
4551 floating-point values to fixed-point.
4553 Text rendering (1.3 - 2x faster)
4554 ------------------------------
4555 xlib-rgba text_image_rgba_source-256 319.73 -> 62.40 : 2.13x speedup
4557 image-rgb text_solid_rgba_over-64 2.85 -> 0.88 : 1.35x speedup
4560 I don't think we've ever set out to improve text performance
4561 specifically, but we did it a bit anyway. I believe the extra
4562 improvement in the xlib backend is due to Monty's image copying fix
4563 above, and the rest is due to the floating-point conversion speedup.
4565 Thin stroke improvements (1.5x faster)
4566 ---------------------------------------------
4567 image-rgb world_map-800 1641.09 -> 414.77 : 1.65x speedup
4569 xlib-rgba world_map-800 1939.66 -> 529.94 : 1.52x speedup
4572 The most modest stuff to announce in this release is the 50%
4573 improvement I made in the world_map case. This is in improvement that
4574 should help basically anything that is doing strokes with many
4575 straight line segments, (and the thinner the better, since that makes
4576 tessellation dominate rasterization). The fixes here are to use a
4577 custom quadrilateral tessellator rather than the generic tessellator
4578 for straight line segments and the miter joins.
4580 Performance results from the Nokia 770
4581 --------------------------------------
4582 xlib-rgba subimage_copy-512 55.88 -> 2.04 : 27.34x speedup
4583 ██████████████████████████▍
4584 xlib-rgb text_image_rgb_over-256 1487.58 -> 294.43 : 5.05x speedup
4586 image-rgb pattern_create_radial-16 187.13 -> 91.86 : 2.04x speedup
4588 xlib-rgba world_map-800 21261.41 -> 15628.02 : 1.36x speedup
4591 Here we see that the subimage_copy improvement was only about half as
4592 large as the corresponding improvement on my laptop, (27x faster
4593 compared to 54x) and the floating-point conversion fix also was quite
4594 as significant, (2x compared to 3x). Oddly the improvement to text
4595 rendering performance was more than twice as good (5x compared to
4596 2x). I don't know what the reason for that is, but I don't think it's
4597 anything anybody should complain about.
4599 Release 1.2.6 (2006-11-02 Behdad Esfahbod <behdad@behdad.org>)
4600 ==============================================================
4601 This is the third bug fix release in the 1.2 series, coming less than
4602 two months after the 1.2.4 release made on August 18.
4604 The 1.2.4 release turned out to be a pretty solid one, except for a crasher
4605 bug when forwarding an X connection where the client and the server have
4606 varying byte orders, eg. from a PPC to an i686. Other than that, various
4607 other small bugs have been fixed.
4609 Various improvements have been made in the testing infrastructure to prevent
4610 false positives, and to make sure the generated cairo shared object behaves as
4611 expected in terms of exported symbols and relocations.
4613 There were a total of 89 changes since 1.2.4. The following list the most
4618 - Avoid unsigned loop control variable to eliminate infinite,
4619 memory-scribbling loop. (#7593)
4620 - Fix cairo_image_surface_create to report INVALID_FORMAT errors.
4621 Previously the detected error was being lost and a nil surface was
4622 returned that erroneously reported CAIRO_STATUS_NO_MEMORY.
4623 - Change _cairo_color_compute_shorts to not rely on any particular
4624 floating-point epsilon value. (#7497)
4625 - Fix infinite-join test case (bug #8379)
4626 - Pass correct surface to create_similar in _cairo_clip_init_deep_copy().
4630 - Fix Type 1 embedding in PDF.
4631 - Correct the value of /LastChar in the PDF Type 1 font dictionary.
4632 - Improve error checking in TrueType subsetting.
4633 - Compute right index when looking up left side bearing. (bug #8180)
4634 - Correct an unsigned to signed conversion problem in truetype subsetting
4636 - Type1 subsetting: Don't put .notdef in Encoding when there are 256 glyphs.
4637 - Add cairo version to PS header / PDF document info dictionary.
4638 - Set CTM before path construction.
4642 - Get correct unhinted outlines on win32. (bug 7603)
4643 - Make cairo as a win32 static library possible.
4644 - Use CAIRO_FORMAT_RGB24 for BITSPIXEL==32 surfaces too.
4648 - Define WINVER if it's not defined. (bug 6456)
4649 - Fix the AMD64 final link by removing SLIM from pixman.
4650 - Misc win32 compilation fixes.
4651 - Add Sun Pro C definition of pixman_private.
4652 - Use pixman_private consistently as prefix not suffix.
4653 - Added three tests check-plt.sh, check-def.sh, and check-header.sh that check
4654 that the shared object, the .def file, and the public headers agree about
4655 the exported symbols.
4656 - Require pkg-config 0.19. (#8686)
4659 Release 1.2.4 (2006-08-18 Carl Worth <cworth@cworth.org>)
4660 =========================================================
4661 This is the second bug fix release in the 1.2 series, coming less than
4662 two weeks after the 1.2.2 release made on August 8.
4664 The big motivation for a quick release was that there were a log of
4665 build system snags that people ran into with the 1.2.2 release. But,
4666 by the time we got those all done, we found that we had a bunch of
4667 fixes for cairo's rendering as well. So there's a lot of goodness in
4668 here for such a short time period.
4672 Fix image surfaces to not be clipped when used as a source (Vladimir Vukicevic)
4673 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=72e25648c4c4bc82ddd938aa4e05887a293f0d8b
4675 Fix a couple of corner cases in dashing degenerate paths (Jeff Muizelaar)
4676 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=fbb1758ba8384650157b2bbbc93d161b0c2a05f0
4678 Fix support for type1 fonts on win32 (Adrian Johnson)
4679 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=da1019c9138695cb838a54f8b871bbfd0e8996d7
4681 Fix assertion failure when rotating bitmap fonts (Carl Worth)
4682 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=0bfa6d4f33b8ddb5dc55bbe419c15df4af856ff9
4684 Fix assertion failure when calling cairo_text_path with bitmap fonts (Carl Worth)
4685 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=9878a033531e6b96b5f27e69e10e90dee7440cd9
4687 Fix mis-handling of cairo_close_path in some situations (Tim Rowley, Carl Worth)
4688 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=53f74e59faf1af78f2f0741ccf1f23aa5dad4efc
4690 Respect font_matrix translation in _cairo_gstate_glyph_path (Behdad Esfahbod)
4691 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=f183b835b111d23e838889178aa8106ec84663b3
4693 Fix vertical metrics adjustment to work with non-identity shapes (Behdad Esfahbod)
4694 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=b7bc263842a798d657a95e539e1693372448837f
4696 [PS] Set correct ImageMatrix in _cairo_ps_surface_emit_bitmap_glyph_data (Behdad Esfahbod)
4697 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=d47388ad759b0a1a0869655a87d9b5eb6ae2445d
4701 Fix xlib detection to prefer pkg-config to avoid false libXt dependency (Behdad Esfahbod)
4702 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=0e78e7144353703cbd28aae6a67cd9ca261f1d68
4704 Fix typos causing win32 build problem with PS,PDF, and SVG backends (Behdad Esfahbod)
4705 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=aea83b908d020e26732753830bb3056e6702a774
4707 Fix configure cache to not use stale results (Behdad Esfahbod)
4708 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=6d0e3260444a2d5b6fb0cb223ac79f1c0e7b3a6e
4710 Fix to not pass unsupported warning options to the compiler (Jens Granseuer)
4711 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=97524a8fdb899de1ae4a3e920fb7bda6d76c5571
4713 Fix to allow env. variables such as png_REQUIRES to override configure detection (Jens Granseuer)
4714 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=abd16e47d6331bd3811c908e524b4dcb6bd23bf0
4716 Fix test suite to not use an old system cairo when converting svg2png (Behdad Esfahbod)
4717 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=6122cc85c8f71b1ba2df3ab86907768edebe1781
4719 Fix test suite to not require signal.h to be present (Behdad Esfahbod)
4720 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=6f8cf53b1e1ccdbe1ab6a275656b19c6e5120e40
4724 Many useful warnings cleanups from sparse, valgrind, and careful eyes
4725 (Kjartan Maraas, Pavel Roskin)
4727 Release 1.2.2 (2006-08-08 Carl Worth <cworth@cworth.org>)
4728 =========================================================
4729 This is the first bug fix release in the 1.2 series since the original
4730 1.2.0 release made six weeks ago.
4732 There were some very serious bugs in the 1.2.0 release, (see below),
4733 so everybody is encouraged to upgrade from 1.2.0 to 1.2.2. The 1.2.2
4734 release maintains source and binary compatibility with 1.2.0 and does
4735 not make any API additions.
4737 Fix crashes with BGR X servers
4738 ------------------------------
4739 With cairo 1.2.0 many people reported problems with all cairo-using
4740 programs, (including all GTK+ programs with GTK+ >= 2.8) immediately
4741 crashing with a complaint about an unsupported image format. This bug
4742 affected X servers that do not provide the Render extension and that
4743 provide a visual with BGR rather than RGB channel order.
4745 report: https://bugs.freedesktop.org/show_bug.cgi?id=7294
4746 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=9ae66174e774b57f16ad791452ed44efc2770a59
4748 Fix the "disappearing text" bug
4749 -------------------------------
4750 With cairo 1.2.0 many people reported that text would disappear from
4751 applications, sometimes reappearing with mouse motion or
4752 selection. The text would disappear after the first space in a string
4753 of text. This bug was caused by an underlying bug in (very common) X
4754 servers, and only affected text rendered without antialiasing, (either
4755 a bitmap font or a vector font with antialiasing disabled). The bug
4756 was also exacerbated by a KDE migration bug that caused antialiasing
4757 to be disabled more than desired.
4759 report: https://bugs.freedesktop.org/show_bug.cgi?id=7494
4760 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=456cdb3058f3b416109a9600167cd8842300ae14
4762 Xorg: https://bugs.freedesktop.org/show_bug.cgi?id=7681
4763 KDE: http://qa.mandriva.com/show_bug.cgi?id=23990
4765 Fix broken image fallback scaling (aka. "broken printing")
4766 ----------------------------------------------------------
4767 The various "print" backends, (pdf, ps, and svg), sometimes fallback
4768 to using image-based rendering for some operations. In cairo 1.2.0
4769 these image fallbacks were scaled improperly. Applications using cairo
4770 can influence the resolution of the image fallbacks with
4771 cairo_surface_set_fallback_resolution. With the bug, any value other
4772 than 72.0 would lead to incorrect results, (larger values would lead
4773 to increasingly shrunken output).
4775 report: https://bugs.freedesktop.org/show_bug.cgi?id=7533
4776 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=1feb4291cf7813494355459bb547eec604c54ffb
4778 Fix inadvertent semantic change of font matrix translation (Behdad Esfahbod)
4779 ----------------------------------------------------------------------------
4780 The 1.2.0 release introduced an inadvertent change to how the
4781 translation components of a font matrix are interpreted. In the 1.0
4782 series, font matrix translation could be used to offset the glyph
4783 origin, (though glyph metrics were reported incorrectly in
4784 1.0). However in 1.2.0, the translation was applied to the advance
4785 values between each glyph. The 1.2.0 behavior is fairly useless in
4786 practice, and it was not intentional to introduce a semantic
4787 change. With 1.2.2 we return to the 1.0 semantics, with a much better
4788 implementation that provides correct glyph metrics.
4790 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=84840e6bba6e72aa88fad7a0ee929e8955ba9051
4792 Fix create_similar to preserve fallback resolution and font options (Behdad Esfahbod)
4793 -------------------------------------------------------------------------------------
4794 There has been a long-standing issue with cairo_surface_create_similar
4795 such that font options and other settings from the original
4796 destination surface would not be preserved to the intermediate
4797 "similar" surface. This could result in incorrect rendering
4798 (particularly with respect to text hinting/antialiasing) with
4799 fallbacks, for example.
4801 report: https://bugs.freedesktop.org/show_bug.cgi?id=4106
4802 fixes: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=9fcb3c32c1f16fe6ab913e27eb54d18b7d9a06b0
4803 http://gitweb.freedesktop.org/?p=cairo;a=commit;h=bdb4e1edadb78a2118ff70b28163f8bd4317f1ec
4805 xlib: Fix text performance regression from 1.0 to 1.2.0 (Vladimir Vukicevic)
4806 ----------------------------------------------------------------------------
4807 Several people noticed that upgrading from cairo 1.0 to cairo 1.2.0
4808 caused a significant performance regression when using the xlib
4809 backend. This performance regression was particularly noticeable when
4810 doing lots of text rendering and when using a high-latency connection
4811 to the X server, (such as a remote X server over an ssh
4812 connection). The slowdown was identified and fixed in 1.2.2.
4814 report: https://bugs.freedesktop.org/show_bug.cgi?id=7514
4815 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=b7191885c88068dad57d68ced69a752d1162b12c
4817 PDF: Eliminate dependency on FreeType library dependency (Adrian Johnson)
4818 -------------------------------------------------------------------------
4819 The cairo 1.2 series adds a supported pdf backend to cairo. In cairo
4820 1.2.0 this backend required the freetype library, which was an
4821 undesirable dependency on systems such as win32, (cairo is designed to
4822 always prefer the "native" font system). As of cairo 1.2.2 the
4823 freetype library is not required to use the pdf backend on the win32
4826 report: https://bugs.freedesktop.org/show_bug.cgi?id=7538
4827 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=a0989f427be87c60415963dd6822b3c5c3781691
4829 PDF: Fix broken output on amd64 (Adrian Johnson)
4830 ------------------------------------------------
4831 report: http://bugzilla.gnome.org/show_bug.cgi?id=349826
4832 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=f4b12e497b7ac282b2f6831b8fb68deebc412e60
4834 PS: Fix broken output for truetype fonts > 64k (Adrian Johnson)
4835 ---------------------------------------------------------------
4836 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=067d97eb1793a6b0d0dddfbd0b54117844511a94
4838 PDF: Fix so that dashing doesn't get stuck on (Kent Worsnop)
4839 ------------------------------------------------------------
4840 Kent notices that with the PDF backend in cairo 1.2.0 as soon as a
4841 stroke was performed with dashing, all subsequent strokes would also
4842 be dashed. There was no way to turn dashing off again.
4844 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=778c4730a86296bf0a71080cf7008d7291792256
4846 Fix memory leaks in failure paths in gradient creation (Alfred Peng)
4847 --------------------------------------------------------------------
4848 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=db06681b487873788b51a6766894fc619eb8d8f2
4850 Fix memory leak in _cairo_surface_show_glyphs (Chris Wilson)
4851 ------------------------------------------------------------
4852 report: https://bugs.freedesktop.org/show_bug.cgi?id=7766
4853 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=e2fddcccb43d06486d3680a19cfdd5a54963fcbd
4855 Solaris: Add definition of cairo_private for some Sun compilers (Alfred Peng)
4856 -----------------------------------------------------------------------------
4857 report: https://bugzilla.mozilla.org/show_bug.cgi?id=341874
4858 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=04757a3aa8deeff3265719ebe01b021638990ec6
4860 Solaris: Change version number of Sun's Xorg server with buggy repeat (Brian Cameron)
4861 -------------------------------------------------------------------------------------
4862 report: https://bugs.freedesktop.org/show_bug.cgi?id=7483
4863 fix: http://gitweb.freedesktop.org/?p=cairo;a=commit;h=e0ad1aa995bcec4246c0b8ab0d5a5a79871ce235
4865 Various memory leak fixes
4866 -------------------------
4867 Fix memory leak in _cairo_surface_show_glyphs (bug 7766)
4868 Fix file handle leak in failure path (bug 7616)
4869 Fix some memory leaks in the test cases.
4870 Fix some memory leaks in font subsetting code used in print backends.
4872 Documentation improvements (Behdad Esfahbod)
4873 --------------------------------------------
4874 Added new documentation for several functions (cairo_show_page,
4875 cairo_copy_page, cairo_in_stroke, cairo_in_fill).
4877 Fixed some syntax errors that were preventing some existing
4878 documentation from being published.
4880 Fixed several minor typographical errors.
4882 Added an index for new symbols in 1.2.
4884 Release 1.2.0 (2006-06-27 Carl Worth <cworth@cworth.org>)
4885 =========================================================
4886 This is the culmination of the work that has gone on within the 1.1
4889 There has been one API addition since the cairo 1.1.10 snapshot:
4891 cairo_xlib_surface_get_width
4892 cairo_xlib_surface_get_height
4894 There's also a new feature without any API change:
4896 Dots can now be drawn by using CAIRO_LINE_CAP_ROUND with
4897 degenerate sub-paths, (cairo_move_to() followed by either
4898 cairo_close_path() or a cairo_line_to() to the same location).
4900 And at least the following bugs have been fixed:
4902 6759 fontconfig option AntiAlias doesn't work in cairo 1.1.2
4903 6955 Some characters aren't displayed when using xlib (cache u...
4904 7268 positive device_offset values don't work as source
4905 * PDF emit_glyph function needs to support bitmapped glyphs
4906 * PS emit_glyph function needs to support bitmapped glyphs
4907 * SVG emit_glyph function needs to support bitmapped glyphs
4908 * PDF: minefield page one is falling back unnecessarily
4909 * PS/PDF: Fix broken placement for vertical glyphs
4910 * PS: Fix to not draw BUTT-capped zero-length dash segments
4911 * Do device offset before float->fixed conversion
4912 http://bugzilla.gnome.org/show_bug.cgi?id=332266
4913 * PS: Fix source surfaces with transformations
4914 * PS: Fix to not draw BUTT-capped degnerate sub-paths
4915 * PS: Don't walk off end of array when printing "~>"
4916 * Fix some memory leaks in the test suite rig
4917 * SVG: Fix memory leak when using cairo_mask
4918 * Fix EXTEND_REFLECT and EXTEND_PAD to not crash (though these are
4919 still not yet fully implemented for surface patterns).
4921 This has been a tremendous effort by everyone, and I'm proud to have
4922 been a part of it. Congratulations to all contributors to cairo!
4924 Snapshot 1.1.10 (2006-06-16 Carl Worth <cworth@cworth.org>)
4925 ===========================================================
4926 This is the fifth in a series of snapshots working toward the 1.2
4929 The primary motivation for this snapshot is to fix a long-standing bug
4930 that had long been silent, but as of the 1.1.8 snapshot started
4931 causing crashes when run against 16-bit depth X servers, (often Xvnc
4932 or Xnest). The fix for this adds a new CAIRO_FORMAT_RGB16_565 to the
4935 This snapshot also includes a rewrite of cairo's SVG backend to
4936 eliminate the dependency on libxml2. With this in place, cairo 1.2
4937 will not depend on any libraries that cairo 1.0 did not.
4939 As usual, there are also a few fixes for minor bugs.
4941 Snapshot 1.1.8 (2006-06-14 Carl Worth <cworth@cworth.org>)
4942 ==========================================================
4943 This is the fourth in a series of snapshots working toward the 1.2
4944 release of cairo. At this point, all major features of the 1.2 release
4945 are in place, leaving just a few bug fixes left.
4947 In particular, there well be no additional API changes between this
4948 1.1.8 snapshot and the 1.2 release.
4950 The announcement for 1.1.6 mentioned several API changes being
4951 considered. Only one of these changes was actually implemented
4952 (set_dpi -> fallback_resolution). This change does introduce one
4953 source-level incompatibility with respect to previous 1.1.x snapshots,
4954 so see below for details.
4956 Here is an abbreviated summary of changes since the 1.1.6 snapshot:
4960 According to the plan mentioned in the 1.1.6 notes, one source-level
4961 incompatible change has been implemented. The following three
4962 functions have been removed from cairo's API:
4964 cairo_pdf_surface_set_dpi
4965 cairo_ps_surface_set_dpi
4966 cairo_svg_surface_set_dpi
4968 and in their place the following function has been added:
4970 cairo_surface_set_fallback_resolution
4972 The signature and semantics of the function remains the same, so it is
4973 a simple matter of changing the name of the function when calling
4974 it. As a transition mechanism, this snapshot will (on many systems)
4975 build to include the old symbols so that code previously compiled will
4976 still run. However, all source code using the old names must be
4977 updated before it will compile. And the upcoming 1.2 release is not
4978 anticipated to include the old symbols.
4980 Finally, it should be pointed out that the old symbols never existed
4981 in the supported API of any stable release of cairo. (In the stable
4982 1.0 releases the PDF, PS, and SVG backends were advertised as
4983 experimental and unstable.)
4985 And, as always, cairo continues to maintain source and binary
4986 compatibility between major releases. So applications compiled against
4987 supported backends in a stable release of cairo (1.0.4 say) will
4988 continue to compile and run without modification against new major
4989 releases (1.2.0 say) without modification.
4993 The following new functions have been added to cairo's API:
4995 cairo_surface_get_content
4996 cairo_debug_reset_static_data
4997 cairo_image_surface_get_data
4998 cairo_image_surface_get_format
4999 cairo_image_surface_get_stride
5000 cairo_win32_font_face_create_for_hfont
5002 New, backend-specific pkg-config files
5003 --------------------------------------
5004 In addition to the original cairo.pc file, cairo will also now install
5005 a pkg-config files for each configured backend, (for example
5006 cairo-pdf.pc, cairo-svg.pc, cairo-xlib.pc, cairo-win32.pc, etc.) this
5007 also includes optional font backends (such as cairo-ft.pc) and the
5008 optional png functionality (cairo-png.pc).
5010 These new pkg-config files should be very convenient for allowing
5011 cairo-using code to easily check for the existing of optional
5012 functionality in cairo without having to write complex rules to grub
5013 through cairo header files or the compiled library looking for
5016 Printing backend (PS, PDF, and SVG)
5017 -----------------------------------
5018 Improving the quality of the "printing" backends has been a priority
5019 of the development between cairo 1.1.6 and cairo 1.1.8.
5021 The big improvement here is in the area of text output. Previously, at
5022 best, text was output as paths without taking advantage of any font
5023 support available in the output file format.
5025 Now, at the minimum text paths will be shared by using type3 fonts
5026 (for PS and PDF---and similarly, defs for SVG). Also, if possible,
5027 type3 and truetype fonts will be embedded in PostScript and PDF
5028 output. There are still some known bugs with this, (for example,
5029 selecting text in a cairo-generated PDF file with an embedded truetype
5030 font does not work). So there will be some more changes in this area
5031 before cairo 1.2, but do try test this feature out as it exists so
5034 Many thanks to Kristian Høgsberg for the truetype and type1 font
5039 Performance improvements by preferring GDI over pixman rendering when possible.
5040 Fixes for text rendering.
5044 Fix potentially big performance bug by making xlib's create_similar
5045 try harder to create a pixmap of a depth matching that of the screen.
5049 Among various other fixes, the following bugs listed in bugzilla have
5052 Bug 2488: Patch to fix pixman samping location bug (#2488).
5053 https://bugs.freedesktop.org/show_bug.cgi?id=2488
5055 Bug 4196: undef MIN an MAX before defining to avoid duplicate definition
5056 https://bugs.freedesktop.org/show_bug.cgi?id=4196
5058 Bug 4723: configure.in: Fix m4 quoting when examining pkg-config version
5059 https://bugs.freedesktop.org/show_bug.cgi?id=4723
5061 Bug 4882: Flag Sun's X server has having buggy_repeat.
5062 https://bugs.freedesktop.org/show_bug.cgi?id=4882
5064 Bug 5306: test/pdf2png: Add missing include of stdio.h
5065 https://bugs.freedesktop.org/show_bug.cgi?id=5306
5067 Bug 7075: Fix make clean to remove cairo.def
5068 https://bugs.freedesktop.org/show_bug.cgi?id=7075
5070 (Many thanks to Behdad Esfahbod for helping us track down and fix many
5073 Snapshot 1.1.6 (2006-05-04 Carl Worth <cworth@cworth.org>)
5074 ==========================================================
5075 This is the third in a series of snapshots working toward the imminent
5076 1.2 release of cairo. For a list of items still needing work on the
5077 cairo 1.2 roadmap, please see:
5079 http://cairographics.org/ROADMAP
5081 As can be seen in that list, there are no longer any API additions
5082 left on the roadmap. Instead, there is a feature (PDF type 3 fonts) a
5083 performance optimization (X server gradients) and a list of bug
5084 fixes. This gives us a fair amount of freedom to cut the 1.2 release
5085 at almost any point by deciding to defer remaining bug fixes to
5086 subsequent maintenance releases such as 1.2.2 and 1.2.4.
5088 Before we will do that, we must first be wiling to commit to all the
5089 new API additions. As a heads-up, there are a couple of potential API
5090 changes being considered. (Note that these are changes to new API
5091 introduced during 1.1 so these will not introduce API
5092 incompatibilities compared to the stable 1.0 series). The changes
5093 being considered are:
5095 cairo_get_group_target: may acquire x and y offset return
5096 parameters. May also be eliminated in favor of
5097 cairo_get_target assuming its role
5099 cairo_pdf_surface_set_dpi:
5100 cairo_ps_surface_set_dpi:
5101 cairo_svg_surface_set_dpi: These functions may be removed in favor
5102 of a new cairo_surface_set_fallback_resolution
5104 Additionally there is the possibility of a slight change in the
5105 semantics of cairo_set_line_width. We believe the current behavior of the sequence:
5107 cairo_set_line_width; ... change CTM ...; cairo_stroke;
5109 is buggy. It is currently behaving the same as:
5111 ... change CTM ...; cairo_set_line_width; cairo_stroke;
5113 We are considering fixing this bug before 1.2 with the hope that
5114 nobody is already relying on the buggy behavior described here. Do
5115 shout if you suspect you might be in that position.
5117 The items included in this snapshot (since the 1.1.4 snapshot) are
5122 The long-awaited group-rendering support is now available with the
5123 following function calls:
5126 cairo_push_group_with_content
5128 cairo_pop_group_to_source
5129 cairo_get_group_target
5131 This API provides a much more convenient mechanism for doing rendering
5132 to an intermediate surface without the need to manually create a
5133 temporary cairo_surface_t and a temporary cairo_t and clean them up
5136 Add the following missing get function to complement
5137 cairo_surface_set_device_offset:
5139 cairo_surface_get_device_offset
5141 PDF backend (API addition)
5142 --------------------------
5143 The PDF backend now provides for per-page size changes, (similar to
5144 what the PostScript backend got in the 1.1.4 snapshot). The new API
5147 cairo_pdf_surface_set_size
5149 Xlib backend (API additions)
5150 ----------------------------
5151 The following functions have been added to allow the extraction of
5154 cairo_xlib_surface_get_display
5155 cairo_xlib_surface_get_drawable
5156 cairo_xlib_surface_get_screen
5157 cairo_xlib_surface_get_visual
5158 cairo_xlib_surface_get_depth
5160 XCB backend (experimental)
5161 --------------------------
5162 Update backend so that it now compiles with the recent XCB 0.9 release.
5164 Bug fixes and memory leak cleanup
5165 ---------------------------------
5166 Various little things, nothing too significant though.
5168 Snapshot 1.1.4 (2006-05-03 Carl Worth <cworth@cworth.org>)
5169 ==========================================================
5170 This is the second in a series of snapshots working toward the
5171 upcoming 1.2 release of cairo. For a list of items still needing work
5172 on the cairo 1.2 roadmap, please see:
5174 http://cairographics.org/ROADMAP
5176 The items included in this snapshot (since the 1.1.2 snapshot) are
5179 PostScript backend: new printing-oriented API
5180 ---------------------------------------------
5181 We anticipate that with cairo 1.2, toolkits will begin to use cairo
5182 for printing on systems that use PostScript as the spool format. To
5183 support this use case, we have added 4 new function calls that are
5184 specific to the PostScript backend:
5186 cairo_ps_surface_set_size
5187 cairo_ps_surface_dsc_comment
5188 cairo_ps_surface_dsc_begin_setup
5189 cairo_ps_surface_dsc_begin_page_setup
5191 These functions allow variation of the page size/orientation from one
5192 page to the next in the PostScript output. They also allow the toolkit
5193 to provide per-document and per-page printer control options in a
5194 device-independent way, (for example, by using PPD options and
5195 emitting them as DSC comments into the PostScript output). This should
5196 allow toolkits to provide very fine-grained control of many options
5197 available in printers, (media size, media type, tray selection, etc.).
5199 SVG backend: builds by default, version control
5200 -----------------------------------------------
5201 The SVG backend continues to see major improvements. It is expected
5202 that the SVG backend will be a supported backend in the 1.2
5203 release. This backend will now be built by default if its dependencies
5204 (freetype and libxml2) are met.
5206 Additionally, the SVG backend now has flexibility with regard to what
5207 version of SVG it targets. It will target SVG 1.1 by default, which
5208 will require image fallbacks for some of the "fancier" cairo
5209 compositing operators. Or with the following new function calls:
5211 cairo_svg_surface_restrict_to_version
5212 cairo_svg_get_versions
5213 cairo_svg_version_to_string
5215 it can be made to target SVG 1.2 in which there is native support for
5216 these compositing operators.
5220 At least the following bugs have been fixed since the 1.1.2 snapshot:
5222 crash at XRenderAddGlyphs
5223 https://bugs.freedesktop.org/show_bug.cgi?id=4705
5225 Can't build cairo-1.1.2 on opensolaris due to " void function cannot return value"
5226 https://bugs.freedesktop.org/show_bug.cgi?id=6792
5228 Missing out-of-memory check at gfx/cairo/cairo/src/cairo-atsui-font.c:185
5229 https://bugzilla.mozilla.org/show_bug.cgi?id=336129
5231 A couple of memory leaks.
5233 Snapshot 1.1.2 (2006-04-25 Carl Worth <cworth@cworth.org>)
5234 ==========================================================
5235 This is the first in a series of snapshots working toward the upcoming
5236 1.2 release of cairo. (Subsequent snapshot will use successive even
5237 numbers for the third digit, 1.1.4, 1.1.6, etc.) This snapshot is
5238 backwards-compatible with the 1.0 series---it makes a few API
5239 additions but does not remove any API.
5241 PostScript and PDF backends are no longer "experimental"
5242 --------------------------------------------------------
5243 The major theme of the 1.2 release is improved PostScript and PDF
5244 backends for cairo. Unlike the 1.0 series, in the 1.2 series these
5245 backends will not be marked as experimental and will be enabled by
5246 default. We encourage people to test this snapshot and the PS/PDF
5247 backends in particular as much as possible.
5249 The PostScript and PDF output is not yet ideal.
5251 * One major problem with the PostScript output is that image
5252 fallbacks are used more often than strictly necessary, and the
5253 image fallbacks are at a lower resolution than desired, (the
5254 cairo_ps_surface_set_dpi call is ignored).
5256 * The major drawback of the current PDF backend implementation is
5257 its text support. Every glyph is represented by a filled path in
5258 the PDF file. The causes file sizes to be much larger and
5259 rendering to be much slower than desired.
5261 It is anticipated that both of these shortcomings will see some
5262 improvements before the final 1.2 release.
5264 In spite of those shortcomings, we hope that the PS and PDF backends
5265 will yield faithful results for pretty much any cairo operations you
5266 can throw at them. Please let us know if you are getting obviously
5267 "different" results from the PS/PDF backends than from the image or
5270 Other new experimental backends
5271 -------------------------------
5272 This snapshot includes three new backends that did not exist in the
5281 These are all currently marked "experimental" and are disabled by
5282 default. But the SVG backend in particular has seen a lot of recent
5283 development and is very close to passing the entire cairo test
5284 suite. It is possible that this backend will become a fully supported
5285 backend by the time of the cairo 1.2 release.
5287 Public API additions
5288 --------------------
5289 There have been a few new API functions added to cairo, including:
5291 New get_type functions for querying sub-types of object:
5293 cairo_surface_get_type
5294 cairo_pattern_get_type
5295 cairo_font_face_get_type
5296 cairo_scaled_font_get_type
5298 More convenience in working with cairo_scaled_font_t with new getter
5301 cairo_scaled_font_get_font_face
5302 cairo_scaled_font_get_font_matrix
5303 cairo_scaled_font_get_ctm
5304 cairo_scaled_font_get_font_options
5306 As well as a convenience function for setting a scaled font into a
5309 cairo_set_scaled_font
5311 and a function to allow text extents to be queried directly from a
5312 scaled font, (without requiring a cairo_surface_t or a cairo_t):
5314 cairo_scaled_font_text_extents
5316 These new scaled font functions were motivated by the needs of the
5319 Finally, a new path-construction function was added which clears the
5320 current point in preparation for a new sub path. This makes cairo_arc
5321 easier to use in some situations:
5325 Before the 1.2 release is final we do still plan a few more API
5326 additions specifically motivated by the needs of Mozilla/Firefox.
5328 Optimizations and bug fixes
5329 ---------------------------
5330 Shortly after the 1.0 maintenance series branched off the mainline
5331 there was a major rework of the cairo font internals. This should
5332 provide some good performance benefits, but it's also another area
5333 people should look at closely for potential regressions.
5335 There has not yet been any widespread, systematic optimization of
5336 cairo, but various performance improvements have been made, (and some
5337 of them are fairly significant). So if some things seem faster than
5338 1.0 then things are good. If there are any performance regressions
5339 compared to 1.0 then there is a real problem and we would like to hear
5342 There has been a huge number of bug fixes---too many to mention in
5343 detail. Again, things should be better, and never worse compared to
5344 1.0. Please let us know if your testing shows otherwise.
5346 Release 1.0.2 (2005-10-03 Carl Worth <cworth@cworth.org>)
5347 =========================================================
5348 For each bug number XXXX below, see:
5350 https://bugs.freedesktop.org/show_bug.cgi?id=XXXX
5356 * 4408 - Add support for dashing of stroked curves
5359 * 4409 - Fix dashing so that each dash is capped on both ends
5362 * 4414 - Prevent SIGILL failures (proper use of -mmmx and -msse flags)
5363 (Sebastien Bacher, Billy Biggs)
5365 * 4299 - Fix crashes with text display in multi-threaded program
5366 (Alexey Shabalin, Carl Worth)
5368 * 4401 - Do not use sincos function since it is buggy on some platforms)
5369 (Tim Mooney, Carl Worth)
5371 * 4245 - Fix several bugs in the test suite exposed by amd64 systems
5372 (Seemant Kulleen, Carl Worth)
5374 * 4321 - Add missing byteswapping on GetImage/PutImage
5375 (Sjoerd Simons, Owen Taylor)
5377 * 4220 - Make the check for rectangular trapezoids simpler and more accurate
5378 (Richard Stellingwerff, Owen Taylor)
5380 * 4260 - Add missing channel-order swapping for antialised fonts
5381 (Barbie LeVile, Owen Taylor)
5383 * 4283 - Fix compilation failure with aggressive inlining (gcc -O3)
5384 (Marco Manfredini, Owen Taylor)
5386 * 4208 - Fix some warnings from sparse
5387 (Kjartan Maraas, Billy Biggs)
5389 * 4269 - Fix to not crash when compiled with -fomit-frame-pointer
5390 (Ronald Wahl, Owen Taylor)
5392 * 4263 - Improve performance for vertical gradients
5393 (Richard Stellingwerff, Owen Taylor)
5396 * 4298 - Accomodate gentoo and Mandriva versions in X server vendor string check
5397 (Billy Biggs, Frederic Crozat, Owen Taylor)
5399 win32-specific fixes
5400 --------------------
5401 * 4599 - Fix "missing wedges" on some stroked paths (win32)
5402 (Tim Rowley, Jonathan Watt, Bertram Felgenhauer, Carl Worth, Keith Packard)
5404 * 4612 - Fix disappearing text if first character out of surface (win32)
5407 * 4602 - Fix shutdown of cairo from failing intermediate, size-0 bitmaps (win32)
5408 Aka. the "white rectangles" bug from mozilla-svg testing
5411 * Various portability improvements for win32
5412 (Hans Breuer, Owen Taylor, Carl Worth)
5414 * 4593 - Fix font sizes to match user expectations (win32)
5415 (Tor Lillqvist, Owen Taylor)
5417 * 3927 - Fix to report metrics of size 0 for glyph-not-available (win32)
5418 (Hans Breuer, Owen Taylor, Tor Lillqvist)
5420 * Add locking primitives for win32
5425 * Fix crash from size-0 pixmap due to empty clip region (xlib)
5426 (Radek Doulík, Carl Worth)
5428 Release 1.0.0 (2005-08-24 Carl Worth <cworth@cworth.org>)
5429 =========================================================
5430 Experimental backends
5431 ---------------------
5432 * The Glitz, PS, PDF, Quartz, and XCB backends have been declared
5433 experimental, and are not part of the API guarantees that accompany
5434 this release. They are not built by default, even when the required
5435 libraries are available, and must be enabled explicitly with
5436 --enable-ps, --enable-pdf, --enable-quartz or --enable-xcb.
5438 It is very painful for us to be pushing out a major release without
5439 these backends enabled. There has been a tremendous amount of work
5440 put into each one and all are quite functional to some
5441 extent. However, each also has some limitations. And none of these
5442 backends have been tested to the level of completeness and
5443 correctness that we expect from cairo backends.
5445 We do encourage people to experiment with these backends and report
5446 success, failure, or means of improving them.
5450 * Prior to 0.9.0 the SOURCE, CLEAR and a number of other operators
5451 behaved in an inconsistent and buggy fashion and could affect areas
5452 outside the clip mask. In 0.9.0, these six "unbounded" operators
5453 were fixed to consistently clear areas outside the shape but within
5454 the clip mask. This is useful behavior for an operator such as IN,
5455 but not what was expected for SOURCE and CLEAR. So, in this release
5456 the behavior of SOURCE and CLEAR has been changed again. They now
5457 affect areas only within both the source and shape. We can write
5458 the new operators as:
5460 SOURCE: dest' = (mask IN clip) ? source : dest
5461 CLEAR: dest' = (mask IN clip) ? 0 : dest
5463 Behavior and API changes
5464 ------------------------
5465 * Setting the filter on a gradient pattern would change the
5466 interpolation between color stops away from the normal linear
5467 interpolation. This dubious behavior has been removed.
5469 * The CAIRO_CONTENT_VALID() and CAIRO_FORMAT_VALID() macros --
5470 implementation details that leaked into cairo.h -- have been moved
5471 into an internal header.
5473 * The cairo_show_text function now advances the current point
5474 according to the total advance values of the string.
5478 * cairo_set_dash can now detect error and can set
5479 CAIRO_STATUS_INVALID_DASH.
5483 * When compiled against recent versions of fontconfig and FreeType,
5484 artificial bold fonts can now be turned on from fonts.conf using
5485 the FC_EMBOLDEN fontconfig key.
5489 * The compositing code from the 'xserver' code tree has now been
5490 completely merged into libpixman. This includes MMX optimization of
5493 * The image transformation code in libpixman has been improved and
5494 now performs significantly faster.
5498 * Several crashes related to corruption in the font caches have been
5501 * All test cases now match pixel-for-pixel on x86 and PPC; this
5502 required fixing bugs in the compositing, stroking, and pattern
5505 * Negative dash offsets have been fixed to work correctly.
5507 * The stroking of paths with mutiple subpaths has now been fixed to
5508 apply caps to all subpaths rather than just the last one.
5510 * Many build fixes for better portability on various systems.
5512 * Lots of other bug fixes, but we're too tired to describe them in
5515 Release 0.9.2 (2005-08-13 Carl Worth <cworth@cworth.org>)
5516 =========================================================
5519 * You will notice that this release jumped from 0.9.0 to 0.9.2. We've
5520 decided to use an odd micro version number (eg. 0.9.1) to indicate
5521 in-progress development between releases. As soon as 0.9.2 is
5522 tagged, the version will be incremented in CVS to 0.9.3 where it
5523 will stay until just before 0.9.4 is built, uploaded, and tagged.
5525 So, even-micro == a released version, odd-micro == something in-between.
5527 Libpixman dependency dropped
5528 ----------------------------
5529 * As of this release, the dependency on an external libpixman has
5530 been dropped. Instead, the code from libpixman needed for cairo has
5531 been incorporated into the cairo source tree. The motivation for
5532 this change is that while cairo's API is stable and ready to be
5533 maintained after the 1.0 release, libpixman's API is not, so we do
5534 not want to expose it at this time.
5536 Also, the incorporation of libpixman into cairo also renames all
5537 previously-public libpixman symbols in order to avoid any conflict
5538 with a future release of libpixman
5542 * Macros and functions have been added so that the version of cairo
5543 can be queried at either compile-time or at run-time. The version
5544 is made available as both a human-readable string and as a single
5547 CAIRO_VERSION_STRING eg. "0.9.2"
5548 CAIRO_VERSION eg. 000902
5551 cairo_version_string (void); /* eg. "0.9.2" */
5554 cairo_version (void); /* eg. 000902 */
5556 A macro is provided to convert a three-part component version into
5557 the encoded single-integer form:
5559 CAIRO_VERSION_ENCODE(X,Y,Z)
5561 For example, the CAIRO_VERSION value of 000902 is obtained as
5562 CAIRO_VERSION_ENCODE(0,9,2). The intent is to make version
5563 comparisons easy, either at compile-time:
5565 #if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(0,9,2)
5571 if (cairo_version() >= CAIRO_VERSION_ENCODE(0,9,2)) { /* ... */ }
5575 * This release adds pthread-based locking (when available) to make
5576 the caches used by cairo safe for threaded programs. Some may
5577 remember a failed experiment with this locking between the 0.5.1
5578 and 0.5.2 snapshots, (where even single-threaded programs that
5579 linked with -lpthread would deadlock). We believe that that problem
5580 has been fixed, so we are looking forward to testing and reports
5581 from users with threaded applications.
5585 * The XCB and Quartz backends failed to compiled in the 0.9.0 release
5586 due to minor syntax errors. These have now been fixed.
5588 * Various crashes in glitz and pixman due to size 0 glyphs have been
5591 Release 0.9.0 (2005-08-08 Carl Worth <cworth@cworth.org>)
5592 =========================================================
5595 * In all prior snapshots, the libtool library versioning was set to
5596 1:0:0. As this release is intended to mark the beginning of
5597 backwards-compatible releases, the versioning has been incremented
5598 to 2:0:0. You will notice that the numeric extension on the
5599 installed library filename will change similarly.
5601 This change will also require all cairo-using applications to be
5602 recompiled. We recognize that this may cause some frustration since
5603 this release is backwards-compatible with 0.6.0 and in that sense
5604 "shouldn't" require re-compilation. However, since all historical
5605 snapshots have used the same 1:0:0 version in spite of incompatible
5606 API changes between them, it was essential that the upcoming 1.0
5607 release series have distinct library versioning.
5609 All future releases will use the library versioning to properly
5610 indicate compatibility between releases. So, any application
5611 re-compiled now to work with the 0.9.0 will not need to be
5612 recompiled when a compatible 1.0 release of cairo is made in the
5617 * Add new function calls to set/get the current antialiasing mode in
5623 This call accepts the same modes recently added for font options
5624 (NONE or GRAY) but affects the rendering of geometry other than
5625 text. The intent of this call is to enable more precise control of
5626 which pixels are affected by each operation, for example to allow
5627 for full-scene antialiasing for seam-free rendering. It is not
5628 expected that non-antialiased rendering will perform better than
5629 anti-aliased rendering.
5631 * Three new functions were added to provide support for mixed cairo-
5632 and non-cairo drawing to the same surface:
5634 cairo_surface_mark_dirty
5635 cairo_surface_mark_dirty_rectangle
5638 * The return type of the several "reference" functions was change,
5639 (API compatibly), from void to the same type as the argument. The
5640 affected functions are:
5642 cairo_font_face_reference
5643 cairo_scaled_font_reference
5644 cairo_pattern_reference
5645 cairo_surface_reference
5648 This allows a convenient way to assign and reference in a single
5653 * The behavior of cairo_set_source with a pattern with a non-identity
5654 matrix was previously not well-defined. The new behavior is as
5657 The pattern's transformation matrix will be locked to the
5658 user space in effect at the time of cairo_set_source(). This means
5659 that further modifications of the CTM will not affect the source
5664 * Some portability improvements, (eg. workaround for missing stdint.h).
5668 * Updated to allow compilation with older versions of freetype.
5672 * Fix the unbounded operators to actually produce a correct result,
5673 (previously the results were artificially restricted to the
5674 bounding box of whatever shape was being drawn rather than
5675 extending out infinitely). The fixed operators are:
5677 CAIRO_OPERATOR_CLEAR
5678 CAIRO_OPERATOR_SOURCE
5681 CAIRO_OPERATOR_DEST_IN
5682 CAIRO_OPERATOR_DEST_ATOP
5684 * Fix cairo_mask and cairo_mask_surface to transform the mask by the
5685 current transformation matrix (CTM).
5687 * Fix cairo_set_source to lock the CTM used to transform the pattern.
5689 * Workaround for X server Render bug involving repeating patterns
5690 with a general transformation matrix.
5692 * cairo_get_font_face fixed to return a "nil" font face object rather
5695 * cairo_set_font_face fixed to not crash if given a NULL font face,
5696 (which is the documented interface for restoring the default font
5699 * Fix xlib glyphset caching to not try to free a NULL glyph.
5701 Snapshot 0.6.0 (2005-07-28 Carl Worth <cworth@cworth.org>)
5702 ==========================================================
5705 * The prototypes of the following functions have changed:
5707 cairo_xlib_surface_create_with_xrender_format
5708 cairo_xlib_surface_create_for_bitmap
5710 A Screen* parameter has been added to each. This allows the cairo
5711 xlib backend to work correctly with multi-head X servers.
5713 * The following function has been modified:
5715 cairo_scaled_font_create
5717 to accept a cairo_font_options_t*. See below fore more details.
5719 * All opaque, reference-counted cairo objects have now been moved to a
5720 standard error-handling scheme. The new objects to receive this
5721 treatment are cairo_font_face_t, cairo_scaled_font_t, and
5722 cairo_surface_t. (Previous snapshots already provided this scheme
5723 for cairo_t, cairo_path_t, and cairo_pattern_t.)
5725 This changes two functions to have a return type of void rather than
5728 cairo_scaled_font_extent
5729 cairo_surface_finish
5731 And significantly, none of the create functions for any of the
5732 objects listed above will return NULL. The pointer returned from any
5733 function will now always be a valid pointer and should always be
5734 passed to the corresponding destroy function when finished
5736 The simplest strategy for porting code is to switch from:
5738 object = cairo_<object>_create ();
5744 cairo_<object>_destroy (object);
5748 object = cairo_<object>_create ();
5749 if (cairo_<object>_status (object))
5754 cairo_<object>_destroy (object);
5756 But significantly, it is not required to check for an error status
5757 before the "act on object" portions of the code above. All
5758 operations on an object with an error status are, by definition,
5759 no-ops without side effect. So new code might be written in an
5760 easier-to-read style of:
5762 object = cairo_<object>_create ();
5766 cairo_<object>_destroy (object);
5768 with cairo_<object>_status checks placed only at strategic
5769 locations. For example, passing an error object to another object,
5770 (eg. cairo_set_source with an in-error pattern), will propagate the
5771 error to the subsequent object (eg. the cairo_t). This means that
5772 error checking can often be deferred even beyond the destruction of
5777 * New functions for checking the status of objects that have been
5778 switched to the common error-handling scheme:
5780 cairo_font_face_status
5781 cairo_scaled_font_status
5782 cairo_surface_status
5784 * The _cairo_error function which was added in 0.5.1 has now been made
5785 much more useful. In 0.5.1 only errors on cairo_t objects passed
5786 through _cairo_error. Now, an error on any object should pass
5787 through _cairo_error making it much more reliable as a debugging
5788 mechanism for finding when an error first occurs.
5790 * Added new font options support with a myriad of functions:
5792 cairo_font_options_create
5793 cairo_font_options_copy
5794 cairo_font_options_destroy
5796 cairo_font_options_status
5798 cairo_font_options_merge
5799 cairo_font_options_equal
5800 cairo_font_options_hash
5802 cairo_font_options_set_antialias
5803 cairo_font_options_get_antialias
5804 cairo_font_options_set_subpixel_order
5805 cairo_font_options_get_subpixel_order
5806 cairo_font_options_set_hint_style
5807 cairo_font_options_get_hint_style
5808 cairo_font_options_set_hint_metrics
5809 cairo_font_options_get_hint_metrics
5811 cairo_surface_get_font_options
5813 cairo_ft_font_options_substitute
5815 cairo_set_font_options
5816 cairo_get_font_options
5818 This new font options support allows the application to have much
5819 more fine-grained control over how fonts are rendered.
5820 Significantly, it also allows surface backends to have some
5821 influence over the process. For example, the xlib backend now
5822 queries existing Xft properties to set font option defaults.
5826 cairo_xlib_surface_set_drawable
5828 which allows the target drawable for an xlib cairo_surface_t to be
5829 changed to another with the same format, screen, and display. This
5830 is necessary in certain double-buffering techniques.
5834 * Sub-pixel text antialiasing is now supported.
5838 * Fixed assertion failure in cairo_surface_create_similar when
5839 application commits an error by passing a cairo_format_t rather than
5842 * Avoid division by zero in various places (cairo-ft).
5844 * Fix infinite loop when using non-default visuals (cairo-xlib).
5846 * Eliminate segfault in cairo_image_surface_create_from_png_stream.
5848 * Prevent errant sign-extension of masks on 64-bit architectures
5849 (cairo-xlib and cairo-xcb).
5851 * Other miscellaneous fixes.
5853 Snapshot 0.5.2 (2005-07-18 Carl Worth <cworth@cworth.org>)
5854 ==========================================================
5857 * New functions for creating patterns of a single color:
5859 cairo_pattern_create_rgb
5860 cairo_pattern_create_rgba
5862 * Change cairo_surface_create_similar to accept a new type of
5863 cairo_content_t rather than cairo_format_t:
5865 typedef enum _cairo_content {
5866 CAIRO_CONTENT_COLOR = 0x1000,
5867 CAIRO_CONTENT_ALPHA = 0x2000,
5868 CAIRO_CONTENT_COLOR_ALPHA = 0x3000
5871 * Add new CAIRO_FORMAT_VALID and CAIRO_CONTENT_VALID macros.
5873 * Remove unused status value:
5875 CAIRO_STATUS_NO_TARGET_SURFACE
5877 * Add new status values:
5879 CAIRO_STATUS_INVALID_STATUS
5881 * Require libpixman >= 0.1.5 (for necessary bug fixes)
5885 * Fix cairo_surface_write_to_png for RGB24 images.
5887 * Fix broken metrics and rendering for bitmap fonts. Add mostly
5888 useless bitmap glyph transformation.
5890 * Fix glyph caches to not eject entries that might be immediately
5891 needed, (fixing intermittent crashes when rendering text).
5893 * Fix all memory leaks found by running "make check-valgrind".
5895 ATSUI backend changes
5896 ---------------------
5897 * Allow building against < 10.3 SDK.
5899 * Prevent crash on empty strings.
5901 Glitz backend changes
5902 ---------------------
5903 * Require glitz >= 0.4.4.
5905 * Use frame buffer objects instead of pbuffers for accelerated
5908 * Minor improvement to gradient pattern creation.
5910 PostScript backend fixes
5911 ------------------------
5912 * Rewrite of the PS backend to generate more interesting output that
5913 the old big-image implementation.
5917 * Implement glyph path support.
5919 * Fix swap of blue and green values in the fill_rectangles path.
5923 * Add optimization to use XCopyArea rather than XRenderComposite when
5924 transforming only with an integer translation, and using SOURCE
5925 operator or OVER with a source pattern without alpha.
5927 Snapshot 0.5.1 (2005-06-20 Carl Worth <cworth@cworth.org>)
5928 ==========================================================
5931 * Removed cairo_status_string(cairo_t*) and add
5932 cairo_status_to_string(cairo_status_t) in its place. Code using
5933 cairo_status_string can be ported forward as follows:
5937 cairo_status_to_string (cairo_status (cr));
5939 * Removed the BAD_NESTING restriction which means that two different
5940 cairo_t objects can now interleave drawing to the same
5941 cairo_surface_t without causing an error.
5943 * The following functions which previously had a return type of
5944 cairo_status_t now have a return type of void:
5946 cairo_pattern_add_color_stop_rgba
5947 cairo_pattern_set_matrix
5948 cairo_pattern_get_matrix
5949 cairo_pattern_set_extend
5950 cairo_pattern_set_filter
5952 See discussion of cairo_pattern_status below for more details.
5956 * Improved error handling:
5959 cairo_pattern_status (cairo_pattern_t *pattern);
5961 This snapshot expands the status-based error handling scheme from
5962 cairo_t to cairo_path_t and cairo_pattern_t. It also expands the
5963 scheme so that object-creating functions, (cairo_create,
5964 cairo_pattern_create_*, cairo_copy_path_*), are now guaranteed to
5965 not return NULL. Instead, in the case of out-of-memory these
5966 functions will return a static object with
5967 status==CAIRO_STATUS_NO_MEMORY. The status can be checked with the
5968 functions cairo_status and cairo_pattern_status, or by direct
5969 inspection of the new status field in cairo_path_t.
5971 Please note that some objects, including cairo_surface_t and all of
5972 the font-related objects have not been converted to this
5973 error-handling scheme.
5975 * In addition to the above changes, a new private function has been added:
5979 This function can be used to set a breakpoint in a debugger to make
5980 it easier to find programming error in cairo-using code. (Currently,
5981 _cairo_error is called when any error is detected within a cairo_t
5982 context, but is not called for non-cairo_t errors such as for
5983 cairo_path_t and cairo_pattern_t).
5985 * Fixed cairo_path_data_t so that its enum is visible to C++ code, (as
5986 cairo_path_data_type_t).
5988 Performance improvements
5989 ------------------------
5990 * Made a minor performance improvement for clipping, (restrict clip
5991 surface to the new intersected bounds).
5993 * Optimize rendering of a solid source pattern with a pixel-aligned
5994 rectangular path to use backend clipping rather than rasterization
5995 and backend compositing.
5997 * Optimize cairo_paint_with_alpha to defer to cairo_paint when alpha
6002 * Fixed memory leak in cairo_copy_path.
6004 * A build fix for non-srcdir builds.
6008 * New support for path-based clipping.
6010 * Fix for text rotated to angles other than multiples of π/2.
6014 * Fix for text extents.
6018 * Implemented a complex workaround for X server bug[*] related to
6019 Render-based compositing with untransformed, repeating source
6020 pictures. The workaround uses core Xlib when possible for
6021 performance, (ie. with CAIRO_OPERATOR_SOURCE or CAIRO_OPERATOR_OVER
6022 with an opaque source surface), and falls back to the pixman
6023 image-based compositing otherwise.
6025 [*] https://bugs.freedesktop.org/show_bug.cgi?id=3566
6027 * Various bug fixes, particularly in the fallback paths.
6029 Snapshot 0.5.0 (2005-05-17 Carl Worth <cworth@cworth.org>)
6030 ==========================================================
6031 This is a pretty big, and fairly significant snapshot. It represents
6032 between 2 and 3 months of solid work from a lot of people on improving
6033 the API as much as possible. I'd like to express my appreciation and
6034 congratulations to everyone who has worked on the big API Shakeup,
6035 (whether in email battles over names, or fixing my silly bugs).
6037 This snapshot will require some effort on the part of users, since
6038 there are a _lot_ of API changes (ie. no cairo program ever written is
6039 safe --- they're all broken now in at least one way). But, in spite of
6040 that, we do encourage everyone to move their code to this snapshot as
6041 soon as possible. And we're doing everything we can think of to make
6042 the transition as smooth as possible.
6044 The idea behind 0.5 is that we've tried to make every good API change
6045 we could want now, and get them all done with. That is, between now
6046 and the 1.0 release of cairo, we expect very few new API changes,
6047 (though some will certainly sneak in). We will have some significant
6048 additions, but the pain of moving code from cairo 0.4 to cairo 0.5
6049 should be a one time experience, and things should be much smoother as
6050 we continue to move toward cairo 1.0.
6052 And with so many changes coming out for the first time in this 0.5
6053 release, we really do need a lot of people trying this out to make
6054 sure the ideas are solid before we freeze the API in preparation for
6057 OK, enough introduction. Here is a (not-quite-complete) description of
6058 the API removals, changes and additions in this snapshot, (compared to
6063 The following public functions have been removed:
6065 - cairo_set_target_*
6067 This is a big change. See the description of cairo_create in
6068 the API changes section for how to deal with this.
6072 Alpha blending hasn't gone away; there's just a much more
6073 unified rendering model now. Almost all uses of
6074 cairo_set_alpha will be trivially replaced with
6075 cairo_set_source_rgba and a few others will be replaced just
6076 as easily with cairo_paint_with_alpha.
6078 - cairo_show_surface
6080 Another useful function that we realized was muddling up the
6081 rendering model. The replacement is quite easy:
6082 cairo_set_source_surface and cairo_paint.
6084 - cairo_matrix_create
6085 - cairo_matrix_destroy
6087 - cairo_matrix_get_affine
6089 These functions supported an opaque cairo_matrix_t. We now
6090 have an exposed cairo_matrix_t structure, so these can be
6093 - cairo_surface_set_repeat
6094 - cairo_surface_set_matrix
6095 - cairo_surface_set_filter
6097 These properties don't belong on surfaces. If you were using
6098 them, you'll just want to instead use
6099 cairo_pattern_create_for_surface and then set these properties
6104 This was a confusing function and hopefully nobody will miss
6105 it. But if you really don't find cairo_save/restore adequate,
6106 let us know and we have another idea for a potential
6109 And while we're on the subject of removals, we carefully tightened up
6110 the cairo header files so they no longer gratuitously include header
6111 files that are not strictly necessary, (stdio.h, stdint.h, pixman.h,
6112 Xrender.h, etc. and their dependencies). This may lead to some
6113 surprising errors, so keep your eyes open for that.
6117 Here are some of the API changes that have occurred:
6119 ~ cairo_create(void) -> cairo_create(cairo_surface_t *)
6121 This is the big change that breaks every program. The ability
6122 to re-target a cairo_t was not particularly useful, but it did
6123 introduce a lot of muddy semantic questions. To eliminate
6124 that, cairo_create now requires its target surface to be
6125 passed in at creation time. This isn't too hard to cope with
6126 as the typical first operation after cairo_create was often
6127 cairo_set_target_foo. So the order of those two swap and the
6128 application instead has cairo_foo_surface_create, then
6131 ~ cairo_current_* -> cairo_get_*
6133 We had a strange mixture of cairo_get and cairo_current
6134 functions. They've all been standardized on cairo_get, (though
6135 note one is cairo_get_current_point).
6137 ~ CAIRO_OPERATOR_SRC -> CAIRO_OPERATOR_SOURCE
6138 ~ CAIRO_OPERATOR_OVER_REVERSE -> CAIRO_OPERATOR_DEST_OVER
6140 Many of the cairo_operator_t symbolic values were renamed to
6141 reduce the amount of abbreviation. The confusing "OP_REVERSE"
6142 naming was also changed to use "DEST_OP" instead which is
6143 easier to read and has wider acceptance in other
6144 libraries/languages.
6146 ~ cairo_set_pattern -> cairo_set_source
6147 ~ cairo_set_rgb_color -> cairo_set_source_rgb
6149 All of the various functions that changed the source
6150 color/pattern were unified to use cairo_set_source names to
6151 make the relation more clear.
6153 ~ cairo_transform_point -> cairo_user_to_device
6154 ~ cairo_transform_distance -> cairo_user_to_device_distance
6155 ~ cairo_inverse_transform_point -> cairo_device_to_user
6156 ~ cairo_inverse_transform_distance -> cairo_device_to_user_distance
6158 These names just seemed a lot more clear.
6160 ~ cairo_init_clip -> cairo_reset_clip
6161 ~ cairo_concat_matrix -> cairo_transform
6163 More abbreviation elimination
6165 ~ cairo_current_path -> cairo_copy_path
6166 ~ cairo_current_path_flat -> cairo_copy_path_flat
6168 The former mechanism for examining the current path was a
6169 function that required 3 or 4 callbacks. This was more
6170 complexity than warranted in most situations. The new
6171 cairo_copy_path function copies the current path into an
6172 exposed data structure, and the documentation provides a
6173 convenient idiom for navigating the path data.
6179 A generalized version of the painting operators cairo_stroke
6180 and cairo_fill. The cairo_paint call applies the source paint
6181 everywhere within the current clip region. Very useful for
6182 clearing a surface to a solid color, or painting an image,
6183 (see cairo_set_source_surface).
6185 + cairo_paint_with_alpha
6187 Like cairo_paint but applying some alpha to the source,
6188 (making the source paint translucent, eg. to blend an image on
6193 A more generalized version of cairo_paint_with_alpha which
6194 allows a pattern to specify the amount of translucence at each
6195 point rather than using a constant value everywhere.
6197 + cairo_mask_surface
6199 A convenience function on cairo_mask for when the mask pattern
6200 is already contained within a surface.
6202 + cairo_surface_set_user_data
6203 + cairo_surface_get_user_data
6204 + cairo_font_face_set_user_data
6205 + cairo_font_face_get_user_data
6207 Associate arbitrary data with a surface or font face for later
6208 retrieval. Get notified when a surface or font face object is
6211 + cairo_surface_finish
6213 Allows the user to instruct cairo to finish all of its
6214 operations for a given surface. This provides a safe point for
6215 doing things such as flushing and closing files that the
6216 surface may have had open for writing.
6218 + cairo_fill_preserve
6219 + cairo_stroke_preserve
6220 + cairo_clip_preserve
6222 One interesting change in cairo is that the path is no longer
6223 part of the graphics state managed by
6224 cairo_save/restore. This allows functions to construct paths
6225 without interfering with the graphics state. But it prevents
6226 the traditional idiom for fill-and-stroke:
6228 cairo_save; cairo_fill; cairo_restore; cairo_stroke
6230 Instead we know have alternate versions cairo cairo_fill,
6231 cairo_stroke, and cairo_clip that preserve the current path
6232 rather than consuming it. So the idiom now becomes simply:
6234 cairo_fill_preserve; cairo_stroke
6236 + cairo_surface_write_to_png
6237 + cairo_surface_write_to_png_stream
6239 In place of a single PNG backend, now a surface created
6240 through any backend (except PDF currently) can be written out
6243 + cairo_image_surface_create_from_png
6244 + cairo_image_surface_create_from_png_stream
6246 And its just as easy to load a PNG image into a surface as well.
6250 With the new, exposed path data structure, it's now possible
6251 to append bulk path data to the current path, (rather than
6252 issuing a long sequence of cairo_move_to/line_to/curve_to
6255 Xlib and XCB backends
6256 ---------------------
6258 Any cairo_format_t and Colormap arguments have been dropped from
6259 cairo_xlib_surface_create. There are also two new
6260 cairo_xlib|xcb_surface_create functions:
6262 cairo_xlib|xcb_surface_create_for_bitmap
6263 (Particular for creating A1 surfaces)
6264 cairo_xlib|xcb_surface_create_with_xrender_format
6265 (For any other surface types, not described by a Visual*)
6267 All of these surface create functions now accept width and height. In
6268 addition, there are new cairo_xlib|xcb_surface_set_size functions
6269 which must be called each time a window that is underlying a surface
6272 Print backends (PS and PDF)
6273 ---------------------------
6274 The old FILE* based interfaces have been eliminated. In their place we
6275 have two different functions. One accepts a simple const char
6276 *filename. The other is a more general function which accepts a
6277 callback write function and a void* closure. This should allow the
6278 flexibility needed to hook up with various stream object in many
6281 In addition, when specifying the surface size during construction, the
6282 units are now device-space units (ie. points) rather than inches. This
6283 provides consistency with all the other surface types and also makes
6284 it much easier to reason about the size of the surface when drawing to
6285 it with the default identity matrix.
6287 Finally, the DPI parameters, which are only needed to control the
6288 quality of fallbacks, have been made optional. Nothing is required
6289 during surface_create (300 DPI is assumed) and
6290 cairo_ps|pdf_surface_set_dpi can be used to set alternate values if
6295 Owen very graciously listened to feedback after the big font rework he
6296 had done for 0.4, and came up with way to improve it even more. In 0.4
6297 there was a cairo_font_t that was always pre-scaled. Now, there is an
6298 unscaled cairo_font_face_t which is easier to construct, (eg. no
6299 scaling matrix required) and work with, (it can be scaled and
6300 transformed after being set on the graphics state). And the font size
6301 manipulation functions are much easier. You can set an explicit size
6302 and read/modify/write the font matrix with:
6305 cairo_get_font_matrix
6306 cairo_set_font_matrix
6308 (Previously you could only multiply in a scale factor or a matrix.) A
6309 pleasant side effect is that we can (and do) now have a default font
6310 size that is reasonable, as opposed to the old default height of one
6311 device-space unit which was useless until scaled.
6313 Of course, the old pre-scaled font had allowed some performance
6314 benefits when getting many metrics for a font. Those benefits are
6315 still made available through the new cairo_scaled_font_t. And a
6316 cairo_font_face_t can be "promoted" to a cairo_scaled_font_t by
6317 suppling a font_matrix and the desired CTM.
6321 Tim Rowley put in the work to bring the Quartz backend back after it
6322 had been disabled in the 0.4.0 snapshot. He was not able to bring back
6323 the function that allows one to create a cairo_font_t from an ATSUI
6327 cairo_atsui_font_create (ATSUStyle style);
6329 because he didn't have a test case for it. If you care about this
6330 function, please provide a fairly minimal test and we'll try to bring
6331 it back in an upcoming snapshot.
6333 Snapshot 0.4.0 (2005-03-08 Carl Worth <cworth@cworth.org>)
6334 ==========================================================
6337 Owen Taylor has converted cairo's documentation system to gtk-doc and
6338 has begun some long-needed work on the documentation, which can now be
6341 http://cairographics.org/manual/
6345 This is the first snapshot to include a functional win32 backend,
6346 (thanks to Owen Taylor). The interface is as follows:
6348 #include <cairo-win32.h>
6351 cairo_set_target_win32 (cairo_t *cr,
6355 cairo_win32_surface_create (HDC hdc);
6358 cairo_win32_font_create_for_logfontw (LOGFONTW *logfont,
6359 cairo_matrix_t *scale);
6362 cairo_win32_font_select_font (cairo_font_t *font,
6366 cairo_win32_font_done_font (cairo_font_t *font);
6369 cairo_win32_font_get_scale_factor (cairo_font_t *font);
6371 And see also the documentation at:
6373 http://cairographics.org/manual/cairo-Microsoft-Windows-Backend.html
6375 Disabled backend: quartz
6376 ------------------------
6377 Unfortunately, the quartz backend code is currently out of date with
6378 respect to some recent backend interface changes. So, the quartz
6379 backend is disabled in this snapshot.
6381 If the quartz backend is brought up-to-date before the next snapshot,
6382 we would be glad to make a 0.4.1 snapshot that re-enables it, (we do
6383 not expect many more big backend interface changes).
6387 The font system has been revamped, (as Owen Taylor's work with
6388 integrating pango and cairo gave us the first serious usage of the
6391 One fundamental, user-visible change is that the cairo_font_t object
6392 now represents a font that is scaled to a particular device
6393 resolution. Further changes are described below.
6397 Removed cairo_font_set_transform and cairo_font_current_transform.
6399 Added cairo_font_extents and cairo_font_glyph_extents. See
6400 documentation for details:
6402 http://cairographics.org/manual/cairo-cairo-t.html#cairo-font-extents
6406 The cairo_ft_font API changed considerably. Please see the
6407 documentation for details:
6409 http://cairographics.org/manual/cairo-FreeType-Fonts.html
6413 Make the fast-path clipping (pixel-aligned rectangles) faster.
6415 Add optimization for applying a constant alpha to a pattern.
6417 Optimize gradients that are horizontal or vertical in device space.
6419 Xlib: When RENDER is not available, use image surfaces for
6420 intermediate surfaces rather than xlib surfaces.
6422 Backend-specific changes
6423 ------------------------
6426 Major update to glitz backend. The output quality should now be just
6427 as good as the image and xlib backends.
6429 Track changes to glitz 0.4.0.
6433 Various improvements to produce more conformant output.
6437 David Reveman contributed a large re-work of the cairo_pattern_t
6438 implementation, providing cleaner code and more optimization
6441 Backend interface changes
6442 -------------------------
6443 Rework backend interface to accept patterns, not surfaces for source
6446 Remove set_matrix, set_filter, and set_repeat functions.
6448 More sophisticated backend interface for image fallbacks,
6449 ({acquire,release}_{source,dest}_image() and clone_similar).
6453 Only install header files for backends that have been compiled.
6455 Fixed some rounding errors leading to incorrectly placed glyphs.
6457 Many other minor fixes.
6459 Snapshot 0.3.0 (2005-01-21 Carl Worth <cworth@cworth.org>)
6460 ==========================================================
6463 1) The public header files will no longer be directly installed into
6464 the system include directory. They will now be installed in a
6465 subdirectory named "cairo", (eg. in /usr/include/cairo rather than
6468 As always, the easiest way for applications to discover the
6469 location of the header file is to let pkg-config generate the
6470 necessary -I CFLAGS and -L/-l LDFLAGS. For example:
6472 cc `pkg-config --cflags --libs cairo` -o foo foo.c
6474 IMPORTANT: Users with old versions of cairo installed will need to
6475 manually remove cairo.h and cairo-features.h from the
6476 system include directories in order to prevent the old
6477 headers from being used in preference to the new ones.
6479 2) The backend-specific portions of the old monolithic cairo.h have
6480 been split out into individual public header files. The new files
6493 Applications will need to be modified to explicitly include the new
6494 header files where appropriate.
6496 3) There are two new graphics backends in this snapshot, a PDF
6497 backend, and a Quartz backend. There is also one new font backend,
6502 Kristian Høgsberg has contributed a new backend to allow cairo-based
6503 applications to generate PDF output. The interface for creating a PDF
6504 surface is similar to that of the PS backend, as can be seen in
6508 cairo_set_target_pdf (cairo_t *cr,
6510 double width_inches,
6511 double height_inches,
6512 double x_pixels_per_inch,
6513 double y_pixels_per_inch);
6516 cairo_pdf_surface_create (FILE *file,
6517 double width_inches,
6518 double height_inches,
6519 double x_pixels_per_inch,
6520 double y_pixels_per_inch);
6522 Once a PDF surface has been created, applications can draw to it as
6523 any other cairo surface.
6525 This code is still a bit rough around the edges, and does not yet
6526 support clipping, surface patterns, or transparent gradients. Text
6527 only works with TrueType fonts at this point and only black text is
6528 supported. Also, the size of the generated PDF files is currently
6531 Kristian is still actively developing this backend, so watch this
6532 space for future progress.
6536 Calum Robinson has contributed a new backend to allow cairo
6537 applications to target native Mac OS X windows through the Quartz
6538 API. Geoff Norton integrated this backend into the current
6539 configure-based build system, while Calum also provided Xcode build
6540 support in the separate "macosx" module available in CVS.
6542 The new interface, available in cairo-quartz.h, is as follows:
6545 cairo_set_target_quartz_context (cairo_t *cr,
6546 CGContextRef context,
6551 cairo_quartz_surface_create (CGContextRef context,
6555 There is an example program available in CVS in cairo-demo/quartz. It
6556 is a port of Keith Packard's fdclock program originally written for
6557 the xlib backend. A screenshot of this program running on Mac OS X is
6560 http://cairographics.org/~cworth/images/fdclock-quartz.png
6564 This new font backend complements the Quartz backend by allowing
6565 applications to use native font selection on Mac OS X. The interface
6566 is a single new function:
6569 cairo_atsui_font_create (ATSUStyle style);
6573 Prototype for non-existent function "cairo_ft_font_destroy" removed.
6575 Now depends on libpixman 0.1.2 or newer, (0.1.3 is being released
6576 concurrently and has some useful performance improvements).
6578 Default paint color is now opaque black, (was opaque white). Default
6579 background color is transparent (as before).
6581 Renamed "struct cairo" to "struct _cairo" to free up the word "cairo"
6582 from the C++ identifier name space.
6584 Functions returning multiple return values through provided pointers,
6585 (cairo_matrix_get_affine, cairo_current_point, and
6586 cairo_current_color_rgb), will now accept NULL for values the user
6589 CAIRO_HAS_FREETYPE_FONT has now been renamed to CAIRO_HAS_FT_FONT.
6591 Performance improvements
6592 ------------------------
6593 Alexander Larsson provided some fantastic performance improvements
6594 yielding a 10000% performance improvement in his application, (when
6595 also including his performance work in libpixman-0.1.3). These include
6597 * Fixed handling of cache misses.
6599 * Creating intermediate clip surfaces at the minimal size required.
6601 * Eliminating roundtrips when creating intermediate Xlib surfaces.
6605 Major re-work of font metrics system by Keith Packard. Font metrics
6606 should now be much more reliable.
6610 Updated for glitz-0.3.0.
6611 Bug fixes in reference counting.
6615 New tests for cache crashing, rotating text, improper filling of
6616 complex polygons, and leaky rasterization.
6620 Fixed assertion failure when selecting the same font multiple times in
6623 Fixed reference counting so cache_destroy functions work.
6625 Remove unintended copyright statement from files generated with
6628 Fixed to eliminate new warnings from gcc 3.4 and gcc 4.
6630 Snapshot 0.2.0 (2004-10-27 Carl Worth <cworth@cworth.org>)
6631 ===========================================================
6632 New license: LGPL/MPL
6633 ---------------------
6634 The most significant news with this release is that the license of
6635 cairo has changed. It is now dual-licensed under the LGPL and the
6636 MPL. For details see the COPYING file as well as COPYING-LGPL-2.1 and
6639 I express my thanks to everyone involved in the license change process
6640 for their patience and support!
6642 New font and glyph internals
6643 ----------------------------
6644 Graydon Hoare has put a tremendous amount of work into new internals
6645 for handling fonts and glyphs, including caches where appropriate.
6646 This work has no impact on the user-level API, but should result in
6647 great performance improvements for applications using text.
6651 This snapshot of cairo includes a (small) test suite in
6652 cairo/test. The tests can be run with "make check". The test suite was
6653 designed to make it very easy to add new tests, and we hope to see
6654 many contributions here. As you find bugs, please try adding a minimal
6655 test case to the suite, and submit it with the bug report to the
6656 cairo@cairographics.org mailing list. This will make it much easier
6657 for us to track progress in fixing bugs.
6659 New name for glitz backend
6660 --------------------------
6661 The gl backend has now been renamed to the glitz backend. This means
6662 that the following names have changed:
6664 CAIRO_HAS_GL_SURFACE -> CAIRO_HAS_GLITZ_SURFACE
6665 cairo_set_target_gl -> cairo_set_target_glitz
6666 cairo_gl_surface_create -> cairo_glitz_surface_create
6668 This change obviously breaks backwards compatibility for applications
6669 using the old gl backend.
6671 Up-to-date with latest glitz snapshots
6672 --------------------------------------
6673 This snapshot of cairo is now up to date with the latest glitz
6674 snapshot, (currently 0.2.3). We know that the latest cairo and glitz
6675 snapshots have been incompatible for a very long time. We've finally
6676 fixed that now and we're determined to not let that happen again.
6678 Revert some tessellation regression bugs
6679 ----------------------------------------
6680 People that have been seeing some tessellation bugs, (eg. leaked
6681 fills), in the CVS version of cairo may have better luck with this
6682 release. A change since the last snapshot was identified to trigger
6683 some of these bugs and was reverted before making the snapshot. The
6684 behavior should be the same as the previous (0.1.23) snapshot.
6686 Miscellaneous changes
6687 ---------------------
6688 Changed CAIRO_FILTER_DEFAULT to CAIRO_FILTER_BEST to make gradients
6691 Track XCB API change regarding iterators.
6695 Fix calculation of required number of vertices for pen.
6697 Fix to avoid zero-dimensioned pixmaps.
6699 Fix broken sort of pen vertices.
6701 Fix bug when cairo_show_text called with a NULL string.
6705 Fix bug in computing image length with XCB.
6707 Fix infinite loop bug in cairo_arc.
6709 Fix memory management interactions with libpixman.
6711 Snapshot 0.1.23 (2004-05-11 Carl Worth <cworth@isi.edu>)
6712 ========================================================
6715 Fix prototype mismatches so that cairo can be built by gcc 3.4.
6717 Updates to track glitz
6718 ----------------------
6719 Various fixes to support the latest glitz snapshot (0.1.2).
6723 Radial gradients now support both inner and outer circles.
6724 Transformed linear gradients are now properly handled.
6725 Fixes for extend type reflect.
6729 Converted shading routines to use fixed point values and introduced a
6730 shading operator structure for more efficient shading calculations.
6731 Support compositing with mask surface when mask is solid or
6732 multi-texturing is available.
6734 PNG backend cleanups
6735 --------------------
6736 Fix output to properly compensate for pre-multiplied alpha format in cairo.
6737 Add support for A8 and A1 image formats.
6741 Avoid crash or infinite loop on null strings and degeneratively short
6744 New? bugs in cairo_clip
6745 -----------------------
6746 There are some fairly serious bugs in cairo_clip. It is sometimes
6747 causing an incorrect result. And even when it does work, it is
6748 sometimes so slow as to be unusable. Some of these bugs may not be
6749 new, (indeed cairo_clip has only ever had a braindead-slow
6750 implementation), but I think they're worth mentioning here.
6752 Snapshot 0.1.22 (2004-04-16 Carl Worth <cworth@isi.edu>)
6753 ========================================================
6754 Cairo was updated to track the changes in libpixman, and now depends
6755 on libpixman version 0.1.1.
6757 Snapshot 0.1.21 (2004-04-09 David Reveman <c99drn@cs.umu.se>)
6758 =============================================================
6761 The OpenGL backend provides hardware accelerated output for
6762 X11 and OS X. The significant new functions are:
6765 cairo_gl_surface_create
6767 Automatic detection of available backends
6768 -----------------------------------------
6769 The configure script now automatically detect what backends are
6770 available, (use ./configure --disable-`backend' to prevent
6771 compilation of specific backends).
6773 Snapshot 0.1.20 (2004-04-06 Carl Worth <cworth@isi.edu>)
6774 ========================================================
6777 David Reveman has contributed a new pattern API which enable linear
6778 and radial gradient patterns in addition to the original surface-based
6779 patterns. The significant new top-level functions are:
6781 cairo_pattern_create_linear
6782 cairo_pattern_create_radial
6783 cairo_pattern_create_for_surface
6784 cairo_pattern_add_color_stop
6787 Any code using the old cairo_set_pattern, (which accepted a
6788 cairo_surface_t rather than a cairo_pattern_t), will need to be
6791 Update to XCB backend
6792 ---------------------
6793 The XCB backend is now enabled by default, (use ./configure
6794 --disable-xcb to turn it off).
6798 Graydon Hoare has added optimizations that make cairo_clip much faster
6799 when the path is a pixel-aligned, rectangular region.
6803 Snapshot 0.1.19 (2004-02-24 Carl Worth <cworth@isi.edu>)
6804 ========================================================
6807 Olivier Andrieu contributed a new PNG backend. It builds on the
6808 existing image backend to make it easy to render "directly" to a
6809 .png file. The user never needs to deal with the actual image
6810 buffer. The significant new functions are:
6812 cairo_set_target_png
6813 cairo_png_surface_create
6815 The PNG backend is not enabled by default so that by default there is
6816 not a new dependency on libpng. Use ./configure --enable-png to enable
6819 Snapshot 0.1.18 (2004-02-17 Carl Worth <cworth@isi.edu>)
6820 ========================================================
6821 Path query functionality
6822 ------------------------
6823 It's now possible to query the current path. The two new functions
6827 cairo_current_path_flat
6829 Each function accepts a number of callback functions that will be
6830 called for each element in the path (move_to, line_to, curve_to,
6831 close_path). The cairo_current_path_flat function does not accept a
6832 curve_to callback. Instead, all curved portions of the path will be
6833 converted to line segments, (within the current tolerance value). This
6834 can be handy for doing things like text-on-path without having to
6835 manually interpolate Bézier splines.
6839 Jamey Sharp has contributed a second X backend that uses the new, lean
6840 XCB library rather than Xlib. It cannot currently be compiled at the
6841 same time as the Xlib backend. See ./configure --enable-xcb.
6843 Build fixes for cygwin.
6847 Snapshot 0.1.17 (2003-12-16 Carl Worth <cworth@isi.edu>)
6848 ========================================================
6852 This snapshot provides much better text support by implementing the
6853 following four functions:
6860 The text/glyph_extents functions can be used to determine the bounding
6861 box (and advance) for text as if drawn by show_text/glyphs.
6863 The text/glyph_path objects functions place text shapes on the current
6864 path, where they can be subsequently manipulated. For example,
6865 following these functions with cairo_stroke allows outline text to be
6866 drawn. Calling cairo_clip allows clipping to a text-shaped region.
6868 Combined dependencies
6869 ---------------------
6870 The cairo core now depends only on the libpixman library. This single
6871 library replaces the three previous libraries libic, libpixregion, and
6872 slim. Thanks to Dave Beckett <dave.beckett@bristol.ac.uk> for all of
6873 the heavy lifting with this renaming effort.
6875 Conditional compilation of backends
6876 -----------------------------------
6877 Cairo now allows optional backends to be disabled at compile time. The
6878 following options may now be passed to the configure script:
6883 Note that the first option is a change from the old --without-x option
6884 which will no longer have any effect.
6886 OS X supported - several byte-order issues resolved
6887 ---------------------------------------------------
6888 Cairo has now been successfully compiled under OS X. Testing revealed
6889 that there were some byte-order problems in the PostScript backend and
6890 the PNG generation in the demos. These have now been resolved.
6894 Graydon Hoare <graydon@redhat.com> implemented the first real text
6895 support using Freetype/fontconfig, (previous versions of cairo used
6896 Xft and could only draw text when using an X backend).
6900 Graydon Hoare <graydon@redhat.com> added the first real support for
6901 running cairo with a non-render-aware X server.
6903 Jamey Sharp <jamey@minilop.net> virtualized the backend font and
6904 surface interfaces in September, 2003.
6908 Xr is renamed cairo to avoid confusion since it no longer had a strict
6913 A new image surface backend is added to Xr. Keith Packard
6914 <keithp@keithp.com> wrote the image compositing code in libic that is
6915 used for the image_surface backend. This code was originally written
6916 as the software fallback for the render extension within the X
6921 Carl Worth <cworth@isi.edu> wrote the first lines of Xr, after Keith
6922 Packard <keithp@keithp.com> proposed the plan for a stateful drawing
6923 library in C providing a PostScript-like rendering model.
6925 LocalWords: mutex BeOS extraordinaire distro's URL lcd bool tarball