src/cairo-xlib-core-compositor.c

   1 /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
   2 /* cairo - a vector graphics library with display and print output
   3  *
   4  * Copyright © 2002 University of Southern California
   5  * Copyright © 2005 Red Hat, Inc.
   6  * Copyright © 2011 Intel Corporation
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it either under the terms of the GNU Lesser General Public
  10  * License version 2.1 as published by the Free Software Foundation
  11  * (the "LGPL") or, at your option, under the terms of the Mozilla
  12  * Public License Version 1.1 (the "MPL"). If you do not alter this
  13  * notice, a recipient may use your version of this file under either
  14  * the MPL or the LGPL.
  15  *
  16  * You should have received a copy of the LGPL along with this library
  17  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  19  * You should have received a copy of the MPL along with this library
  20  * in the file COPYING-MPL-1.1
  21  *
  22  * The contents of this file are subject to the Mozilla Public License
  23  * Version 1.1 (the "License"); you may not use this file except in
  24  * compliance with the License. You may obtain a copy of the License at
  25  * http://www.mozilla.org/MPL/
  26  *
  27  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  28  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  29  * the specific language governing rights and limitations.
  30  *
  31  * The Original Code is the cairo graphics library.
  32  *
  33  * The Initial Developer of the Original Code is University of Southern
  34  * California.
  35  *
  36  * Contributor(s):
  37  *      Carl D. Worth <cworth@cworth.org>
  38  *      Behdad Esfahbod <behdad@behdad.org>
  39  *      Chris Wilson <chris@chris-wilson.co.uk>
  40  *      Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
  41  */
  42
  43 /* The original X drawing API was very restrictive in what it could handle,
  44  * pixel-aligned fill/blits are all that map into Cairo's drawing model.
  45  */
  46
  47 #include "cairoint.h"
  48
  49 #if !CAIRO_HAS_XLIB_XCB_FUNCTIONS
  50
  51 #include "cairo-xlib-private.h"
  52 #include "cairo-xlib-surface-private.h"
  53
  54 #include "cairo-boxes-private.h"
  55 #include "cairo-clip-inline.h"
  56 #include "cairo-compositor-private.h"
  57 #include "cairo-image-surface-private.h"
  58 #include "cairo-pattern-private.h"
  59 #include "cairo-region-private.h"
  60 #include "cairo-surface-offset-private.h"
  61
  62 /* the low-level interface */
  63
  64 static cairo_int_status_t
  65 acquire (void *abstract_dst)
  66 {
  67     cairo_xlib_surface_t *dst = abstract_dst;
  68     return _cairo_xlib_display_acquire (dst->base.device, &dst->display);
  69 }
  70
  71 static cairo_int_status_t
  72 release (void *abstract_dst)
  73 {
  74     cairo_xlib_surface_t *dst = abstract_dst;
  75
  76     cairo_device_release (&dst->display->base);
  77     dst->display = NULL;
  78
  79     return CAIRO_STATUS_SUCCESS;
  80 }
  81
  82 struct _fill_box {
  83     Display *dpy;
  84     Drawable drawable;
  85     GC gc;
  86 };
  87
  88 static cairo_bool_t fill_box (cairo_box_t *box, void *closure)
  89 {
  90     struct _fill_box *data = closure;
  91     int x = _cairo_fixed_integer_part (box->p1.x);
  92     int y = _cairo_fixed_integer_part (box->p1.y);
  93     int width  = _cairo_fixed_integer_part (box->p2.x - box->p1.x);
  94     int height = _cairo_fixed_integer_part (box->p2.y - box->p1.y);
  95
  96     XFillRectangle (data->dpy, data->drawable, data->gc, x, y, width, height);
  97     return TRUE;
  98 }
  99
 100 static void
 101 _characterize_field (uint32_t mask, int *width, int *shift)
 102 {
 103     *width = _cairo_popcount (mask);
 104     /* The final '& 31' is to force a 0 mask to result in 0 shift. */
 105     *shift = _cairo_popcount ((mask - 1) & ~mask) & 31;
 106 }
 107
 108 static uint32_t
 109 color_to_pixel (cairo_xlib_surface_t    *dst,
 110                 const cairo_color_t     *color)
 111 {
 112     uint32_t rgba = 0;
 113     int width, shift;
 114
 115     _characterize_field (dst->a_mask, &width, &shift);
 116     rgba |= color->alpha_short >> (16 - width) << shift;
 117
 118     _characterize_field (dst->r_mask, &width, &shift);
 119     rgba |= color->red_short >> (16 - width) << shift;
 120
 121     _characterize_field (dst->g_mask, &width, &shift);
 122     rgba |= color->green_short >> (16 - width) << shift;
 123
 124     _characterize_field (dst->b_mask, &width, &shift);
 125     rgba |= color->blue_short >> (16 - width) << shift;
 126
 127     return rgba;
 128 }
 129
 130 static cairo_int_status_t
 131 fill_boxes (cairo_xlib_surface_t    *dst,
 132             const cairo_color_t     *color,
 133             cairo_boxes_t           *boxes)
 134 {
 135     cairo_surface_t *dither = NULL;
 136     cairo_status_t status;
 137     struct _fill_box fb;
 138
 139     status = _cairo_xlib_surface_get_gc (dst->display, dst, &fb.gc);
 140     if (unlikely (status))
 141         return status;
 142
 143     fb.dpy = dst->display->display;
 144     fb.drawable = dst->drawable;
 145
 146     if (dst->visual && dst->visual->class != TrueColor && 0) {
 147         cairo_solid_pattern_t solid;
 148         cairo_surface_attributes_t attrs;
 149
 150         _cairo_pattern_init_solid (&solid, color);
 151 #if 0
 152         status = _cairo_pattern_acquire_surface (&solid.base, &dst->base,
 153                                                  0, 0,
 154                                                  ARRAY_LENGTH (dither_pattern[0]),
 155                                                  ARRAY_LENGTH (dither_pattern),
 156                                                  CAIRO_PATTERN_ACQUIRE_NONE,
 157                                                  &dither,
 158                                                  &attrs);
 159         if (unlikely (status)) {
 160             _cairo_xlib_surface_put_gc (dst->display, dst, fb.gc);
 161             return status;
 162         }
 163 #endif
 164
 165         XSetTSOrigin (fb.dpy, fb.gc,
 166                       - (dst->base.device_transform.x0 + attrs.x_offset),
 167                       - (dst->base.device_transform.y0 + attrs.y_offset));
 168         XSetTile (fb.dpy, fb.gc, ((cairo_xlib_surface_t *) dither)->drawable);
 169     } else {
 170         XGCValues gcv;
 171
 172         gcv.foreground = color_to_pixel (dst, color);
 173         gcv.fill_style = FillSolid;
 174
 175         XChangeGC (fb.dpy, fb.gc, GCFillStyle | GCForeground, &gcv);
 176     }
 177
 178     _cairo_boxes_for_each_box (boxes, fill_box, &fb);
 179
 180     _cairo_xlib_surface_put_gc (dst->display, dst, fb.gc);
 181
 182     cairo_surface_destroy (dither);
 183
 184     return CAIRO_STATUS_SUCCESS;
 185 }
 186
 187 struct _fallback_box {
 188     cairo_xlib_surface_t        *dst;
 189     cairo_format_t               format;
 190     const cairo_pattern_t       *pattern;
 191 };
 192
 193 static cairo_bool_t fallback_box (cairo_box_t *box, void *closure)
 194 {
 195     struct _fallback_box *data = closure;
 196     int x = _cairo_fixed_integer_part (box->p1.x);
 197     int y = _cairo_fixed_integer_part (box->p1.y);
 198     int width  = _cairo_fixed_integer_part (box->p2.x - box->p1.x);
 199     int height = _cairo_fixed_integer_part (box->p2.y - box->p1.y);
 200     cairo_surface_t *image;
 201     cairo_status_t status;
 202
 203     /* XXX for EXTEND_NONE and if the box is wholly outside we can just fill */
 204
 205     image = cairo_surface_create_similar_image (&data->dst->base, data->format,
 206                                                 width, height);
 207     status = _cairo_surface_offset_paint (image, x, y,
 208                                           CAIRO_OPERATOR_SOURCE,
 209                                           data->pattern, NULL);
 210     if (status == CAIRO_STATUS_SUCCESS) {
 211         status = _cairo_xlib_surface_draw_image (data->dst,
 212                                                  (cairo_image_surface_t *)image,
 213                                                  0, 0,
 214                                                  width, height,
 215                                                  x, y);
 216     }
 217     cairo_surface_destroy (image);
 218
 219     return status == CAIRO_STATUS_SUCCESS;
 220 }
 221
 222 static cairo_int_status_t
 223 fallback_boxes (cairo_xlib_surface_t    *dst,
 224                 const cairo_pattern_t   *pattern,
 225                 cairo_boxes_t           *boxes)
 226 {
 227     struct _fallback_box fb;
 228
 229     /* XXX create_similar_image using pixman_format? */
 230     switch (dst->depth) {
 231     case 8: fb.format = CAIRO_FORMAT_A8; break;
 232     case 16: fb.format = CAIRO_FORMAT_RGB16_565; break;
 233     case 24: fb.format = CAIRO_FORMAT_RGB24; break;
 234     case 30: fb.format = CAIRO_FORMAT_RGB30; break;
 235     case 32: fb.format = CAIRO_FORMAT_ARGB32; break;
 236     default: return CAIRO_INT_STATUS_UNSUPPORTED;
 237     }
 238
 239     fb.dst = dst;
 240     fb.pattern = pattern;
 241
 242     if (! _cairo_boxes_for_each_box (boxes, fallback_box, &fb))
 243         return CAIRO_INT_STATUS_UNSUPPORTED;
 244
 245     return CAIRO_STATUS_SUCCESS;
 246 }
 247
 248 static cairo_int_status_t
 249 render_boxes (cairo_xlib_surface_t      *dst,
 250               const cairo_pattern_t     *pattern,
 251               cairo_boxes_t             *boxes)
 252 {
 253     double pad;
 254
 255     if (_cairo_pattern_analyze_filter (pattern, &pad) != CAIRO_FILTER_NEAREST)
 256         return fallback_boxes (dst, pattern, boxes);
 257
 258     switch (pattern->extend) {
 259     default:
 260     case CAIRO_EXTEND_NONE:
 261     case CAIRO_EXTEND_REFLECT:
 262     case CAIRO_EXTEND_PAD:
 263         return fallback_boxes (dst, pattern, boxes);
 264
 265     case CAIRO_EXTEND_REPEAT: /* XXX Use tiling */
 266         return fallback_boxes (dst, pattern, boxes);
 267     }
 268 }
 269
 270 /* the mid-level: converts boxes into drawing operations */
 271
 272 struct _box_data {
 273     Display *dpy;
 274     cairo_xlib_surface_t *dst;
 275     cairo_surface_t *src;
 276     GC gc;
 277     int tx, ty;
 278     int width, height;
 279 };
 280
 281 static cairo_bool_t source_contains_box (cairo_box_t *box, void *closure)
 282 {
 283     struct _box_data *data = closure;
 284
 285     /* The box is pixel-aligned so the truncation is safe. */
 286     return
 287         _cairo_fixed_integer_part (box->p1.x) + data->tx >= 0 &&
 288         _cairo_fixed_integer_part (box->p1.y) + data->ty >= 0 &&
 289         _cairo_fixed_integer_part (box->p2.x) + data->tx <= data->width &&
 290         _cairo_fixed_integer_part (box->p2.y) + data->ty <= data->height;
 291 }
 292
 293 static cairo_bool_t image_upload_box (cairo_box_t *box, void *closure)
 294 {
 295     const struct _box_data *iub = closure;
 296     int x = _cairo_fixed_integer_part (box->p1.x);
 297     int y = _cairo_fixed_integer_part (box->p1.y);
 298     int width  = _cairo_fixed_integer_part (box->p2.x - box->p1.x);
 299     int height = _cairo_fixed_integer_part (box->p2.y - box->p1.y);
 300
 301     return _cairo_xlib_surface_draw_image (iub->dst,
 302                                            (cairo_image_surface_t *)iub->src,
 303                                            x + iub->tx, y + iub->ty,
 304                                            width, height,
 305                                            x, y) == CAIRO_STATUS_SUCCESS;
 306 }
 307
 308 static cairo_bool_t
 309 surface_matches_image_format (cairo_xlib_surface_t *surface,
 310                               cairo_image_surface_t *image)
 311 {
 312     cairo_format_masks_t format;
 313
 314     return (_pixman_format_to_masks (image->pixman_format, &format) &&
 315             (format.alpha_mask == surface->a_mask || surface->a_mask == 0) &&
 316             (format.red_mask   == surface->r_mask || surface->r_mask == 0) &&
 317             (format.green_mask == surface->g_mask || surface->g_mask == 0) &&
 318             (format.blue_mask  == surface->b_mask || surface->b_mask == 0));
 319 }
 320
 321 static cairo_status_t
 322 upload_image_inplace (cairo_xlib_surface_t *dst,
 323                       const cairo_pattern_t *source,
 324                       cairo_boxes_t *boxes)
 325 {
 326     const cairo_surface_pattern_t *pattern;
 327     struct _box_data iub;
 328     cairo_image_surface_t *image;
 329
 330     if (source->type != CAIRO_PATTERN_TYPE_SURFACE)
 331         return CAIRO_INT_STATUS_UNSUPPORTED;
 332
 333     pattern = (const cairo_surface_pattern_t *) source;
 334     if (pattern->surface->type != CAIRO_SURFACE_TYPE_IMAGE)
 335         return CAIRO_INT_STATUS_UNSUPPORTED;
 336
 337     image = (cairo_image_surface_t *) pattern->surface;
 338     if (image->format == CAIRO_FORMAT_INVALID)
 339         return CAIRO_INT_STATUS_UNSUPPORTED;
 340
 341     if (image->depth != dst->depth)
 342         return CAIRO_INT_STATUS_UNSUPPORTED;
 343
 344     if (! surface_matches_image_format (dst, image))
 345         return CAIRO_INT_STATUS_UNSUPPORTED;
 346
 347     /* XXX subsurface */
 348
 349     if (! _cairo_matrix_is_integer_translation (&source->matrix,
 350                                                 &iub.tx, &iub.ty))
 351         return CAIRO_INT_STATUS_UNSUPPORTED;
 352
 353     iub.dst = dst;
 354     iub.src = &image->base;
 355     iub.width  = image->width;
 356     iub.height = image->height;
 357
 358     /* First check that the data is entirely within the image */
 359     if (! _cairo_boxes_for_each_box (boxes, source_contains_box, &iub))
 360         return CAIRO_INT_STATUS_UNSUPPORTED;
 361
 362     if (! _cairo_boxes_for_each_box (boxes, image_upload_box, &iub))
 363         return CAIRO_INT_STATUS_UNSUPPORTED;
 364
 365     return CAIRO_STATUS_SUCCESS;
 366 }
 367
 368 static cairo_bool_t copy_box (cairo_box_t *box, void *closure)
 369 {
 370     const struct _box_data *cb = closure;
 371     int x = _cairo_fixed_integer_part (box->p1.x);
 372     int y = _cairo_fixed_integer_part (box->p1.y);
 373     int width  = _cairo_fixed_integer_part (box->p2.x - box->p1.x);
 374     int height = _cairo_fixed_integer_part (box->p2.y - box->p1.y);
 375
 376     XCopyArea (cb->dpy,
 377                ((cairo_xlib_surface_t *)cb->src)->drawable,
 378                cb->dst->drawable,
 379                cb->gc,
 380                x + cb->tx, y + cb->ty,
 381                width, height,
 382                x, y);
 383     return TRUE;
 384 }
 385
 386 static cairo_status_t
 387 copy_boxes (cairo_xlib_surface_t *dst,
 388             const cairo_pattern_t *source,
 389             cairo_boxes_t *boxes)
 390 {
 391     const cairo_surface_pattern_t *pattern;
 392     struct _box_data cb;
 393     cairo_xlib_surface_t *src;
 394     cairo_status_t status;
 395
 396     if (source->type != CAIRO_PATTERN_TYPE_SURFACE)
 397         return CAIRO_INT_STATUS_UNSUPPORTED;
 398
 399     /* XXX subsurface */
 400
 401     pattern = (const cairo_surface_pattern_t *) source;
 402     if (pattern->surface->backend->type != CAIRO_SURFACE_TYPE_XLIB)
 403         return CAIRO_INT_STATUS_UNSUPPORTED;
 404
 405     src = (cairo_xlib_surface_t *) pattern->surface;
 406     if (src->depth != dst->depth)
 407         return CAIRO_INT_STATUS_UNSUPPORTED;
 408
 409     /* We can only have a single control for subwindow_mode on the
 410      * GC. If we have a Window destination, we need to set ClipByChildren,
 411      * but if we have a Window source, we need IncludeInferiors. If we have
 412      * both a Window destination and source, we must fallback. There is
 413      * no convenient way to detect if a drawable is a Pixmap or Window,
 414      * therefore we can only rely on those surfaces that we created
 415      * ourselves to be Pixmaps, and treat everything else as a potential
 416      * Window.
 417      */
 418     if (! src->owns_pixmap && ! dst->owns_pixmap)
 419         return CAIRO_INT_STATUS_UNSUPPORTED;
 420
 421     if (! _cairo_xlib_surface_same_screen (dst, src))
 422         return CAIRO_INT_STATUS_UNSUPPORTED;
 423
 424     if (! _cairo_matrix_is_integer_translation (&source->matrix,
 425                                                 &cb.tx, &cb.ty))
 426         return CAIRO_INT_STATUS_UNSUPPORTED;
 427
 428     cb.dpy = dst->display->display;
 429     cb.dst = dst;
 430     cb.src = &src->base;
 431     cb.width  = src->width;
 432     cb.height = src->height;
 433
 434     /* First check that the data is entirely within the image */
 435     if (! _cairo_boxes_for_each_box (boxes, source_contains_box, &cb))
 436         return CAIRO_INT_STATUS_UNSUPPORTED;
 437
 438     status = _cairo_xlib_surface_get_gc (dst->display, dst, &cb.gc);
 439     if (unlikely (status))
 440         return status;
 441
 442     if (! src->owns_pixmap) {
 443         XGCValues gcv;
 444
 445         gcv.subwindow_mode = IncludeInferiors;
 446         XChangeGC (dst->display->display, cb.gc, GCSubwindowMode, &gcv);
 447     }
 448
 449     status = CAIRO_STATUS_SUCCESS;
 450     if (! _cairo_boxes_for_each_box (boxes, copy_box, &cb))
 451         status = CAIRO_INT_STATUS_UNSUPPORTED;
 452
 453     if (! src->owns_pixmap) {
 454         XGCValues gcv;
 455
 456         gcv.subwindow_mode = ClipByChildren;
 457         XChangeGC (dst->display->display, cb.gc, GCSubwindowMode, &gcv);
 458     }
 459
 460     _cairo_xlib_surface_put_gc (dst->display, dst, cb.gc);
 461
 462     return status;
 463 }
 464
 465 static cairo_status_t
 466 draw_boxes (cairo_composite_rectangles_t *extents,
 467             cairo_boxes_t *boxes)
 468 {
 469     cairo_xlib_surface_t *dst = (cairo_xlib_surface_t *)extents->surface;
 470     cairo_operator_t op = extents->op;
 471     const cairo_pattern_t *src = &extents->source_pattern.base;
 472     cairo_int_status_t status;
 473
 474     if (boxes->num_boxes == 0 && extents->is_bounded)
 475         return CAIRO_STATUS_SUCCESS;
 476
 477     if (! boxes->is_pixel_aligned)
 478         return CAIRO_INT_STATUS_UNSUPPORTED;
 479
 480     if (op == CAIRO_OPERATOR_CLEAR)
 481         op = CAIRO_OPERATOR_SOURCE;
 482
 483     if (op == CAIRO_OPERATOR_OVER &&
 484         _cairo_pattern_is_opaque (src, &extents->bounded))
 485         op = CAIRO_OPERATOR_SOURCE;
 486
 487     if (dst->base.is_clear && op == CAIRO_OPERATOR_OVER)
 488         op = CAIRO_OPERATOR_SOURCE;
 489
 490     if (op != CAIRO_OPERATOR_SOURCE)
 491         return CAIRO_INT_STATUS_UNSUPPORTED;
 492
 493     status = acquire (dst);
 494     if (unlikely (status))
 495         return status;
 496
 497     if (src->type == CAIRO_PATTERN_TYPE_SOLID) {
 498         status = fill_boxes (dst,
 499                              &((cairo_solid_pattern_t *) src)->color,
 500                              boxes);
 501     } else {
 502         status = upload_image_inplace (dst, src, boxes);
 503         if (status == CAIRO_INT_STATUS_UNSUPPORTED)
 504             status = copy_boxes (dst, src, boxes);
 505         if (status == CAIRO_INT_STATUS_UNSUPPORTED)
 506             status = render_boxes (dst, src, boxes);
 507     }
 508
 509     release (dst);
 510
 511     return status;
 512 }
 513
 514 /* high-level compositor interface */
 515
 516 static cairo_int_status_t
 517 _cairo_xlib_core_compositor_paint (const cairo_compositor_t     *compositor,
 518                                    cairo_composite_rectangles_t *extents)
 519 {
 520     cairo_int_status_t status;
 521
 522     status = CAIRO_INT_STATUS_UNSUPPORTED;
 523     if (_cairo_clip_is_region (extents->clip)) {
 524         cairo_boxes_t boxes;
 525
 526          _cairo_clip_steal_boxes (extents->clip, &boxes);
 527          status = draw_boxes (extents, &boxes);
 528          _cairo_clip_unsteal_boxes (extents->clip, &boxes);
 529     }
 530
 531     return status;
 532 }
 533
 534 static cairo_int_status_t
 535 _cairo_xlib_core_compositor_stroke (const cairo_compositor_t    *compositor,
 536                                     cairo_composite_rectangles_t *extents,
 537                                     const cairo_path_fixed_t    *path,
 538                                     const cairo_stroke_style_t  *style,
 539                                     const cairo_matrix_t        *ctm,
 540                                     const cairo_matrix_t        *ctm_inverse,
 541                                     double                       tolerance,
 542                                     cairo_antialias_t            antialias)
 543 {
 544     cairo_int_status_t status;
 545
 546     status = CAIRO_INT_STATUS_UNSUPPORTED;
 547     if (extents->clip->path == NULL &&
 548         _cairo_path_fixed_stroke_is_rectilinear (path)) {
 549         cairo_boxes_t boxes;
 550
 551         _cairo_boxes_init_with_clip (&boxes, extents->clip);
 552         status = _cairo_path_fixed_stroke_rectilinear_to_boxes (path,
 553                                                                 style,
 554                                                                 ctm,
 555                                                                 antialias,
 556                                                                 &boxes);
 557         if (likely (status == CAIRO_INT_STATUS_SUCCESS))
 558             status = draw_boxes (extents, &boxes);
 559         _cairo_boxes_fini (&boxes);
 560     }
 561
 562     return status;
 563 }
 564
 565 static cairo_int_status_t
 566 _cairo_xlib_core_compositor_fill (const cairo_compositor_t      *compositor,
 567                                   cairo_composite_rectangles_t  *extents,
 568                                   const cairo_path_fixed_t      *path,
 569                                   cairo_fill_rule_t              fill_rule,
 570                                   double                         tolerance,
 571                                   cairo_antialias_t              antialias)
 572 {
 573     cairo_int_status_t status;
 574
 575     status = CAIRO_INT_STATUS_UNSUPPORTED;
 576     if (extents->clip->path == NULL &&
 577         _cairo_path_fixed_fill_is_rectilinear (path)) {
 578         cairo_boxes_t boxes;
 579
 580         _cairo_boxes_init_with_clip (&boxes, extents->clip);
 581         status = _cairo_path_fixed_fill_rectilinear_to_boxes (path,
 582                                                               fill_rule,
 583                                                               antialias,
 584                                                               &boxes);
 585         if (likely (status == CAIRO_INT_STATUS_SUCCESS))
 586             status = draw_boxes (extents, &boxes);
 587         _cairo_boxes_fini (&boxes);
 588     }
 589
 590     return status;
 591 }
 592
 593 const cairo_compositor_t *
 594 _cairo_xlib_core_compositor_get (void)
 595 {
 596     static cairo_compositor_t compositor;
 597
 598     if (compositor.delegate == NULL) {
 599         compositor.delegate = _cairo_xlib_fallback_compositor_get ();
 600
 601         compositor.paint = _cairo_xlib_core_compositor_paint;
 602         compositor.mask  = NULL;
 603         compositor.fill  = _cairo_xlib_core_compositor_fill;
 604         compositor.stroke = _cairo_xlib_core_compositor_stroke;
 605         compositor.glyphs = NULL; /* XXX PolyGlyph? */
 606     }
 607
 608     return &compositor;
 609 }
 610
 611 #endif /* !CAIRO_HAS_XLIB_XCB_FUNCTIONS */