2 * Copyright 2006 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkPaint_DEFINED
9 #define SkPaint_DEFINED
12 #include "SkDrawLooper.h"
14 #include "SkXfermode.h"
17 class SkAutoGlyphCache;
20 struct SkDeviceProperties;
35 typedef const SkGlyph& (*SkDrawCacheProc)(SkGlyphCache*, const char**,
36 SkFixed x, SkFixed y);
38 typedef const SkGlyph& (*SkMeasureCacheProc)(SkGlyphCache*, const char**);
40 #define kBicubicFilterBitmap_Flag kHighQualityFilterBitmap_Flag
44 The SkPaint class holds the style and color information about how to draw
45 geometries, text and bitmaps.
48 class SK_API SkPaint {
51 SkPaint(const SkPaint& paint);
54 SkPaint& operator=(const SkPaint&);
56 /** operator== may give false negatives: two paints that draw equivalently
57 may return false. It will never give false positives: two paints that
58 are not equivalent always return false.
60 SK_API friend bool operator==(const SkPaint& a, const SkPaint& b);
61 friend bool operator!=(const SkPaint& a, const SkPaint& b) {
65 /** getHash() is a shallow hash, with the same limitations as operator==.
66 * If operator== returns true for two paints, getHash() returns the same value for each.
68 uint32_t getHash() const;
70 void flatten(SkWriteBuffer&) const;
71 void unflatten(SkReadBuffer&);
73 /** Restores the paint to its initial settings.
77 /** Specifies the level of hinting to be performed. These names are taken
78 from the Gnome/Cairo names for the same. They are translated into
79 Freetype concepts the same as in cairo-ft-font.c:
80 kNo_Hinting -> FT_LOAD_NO_HINTING
81 kSlight_Hinting -> FT_LOAD_TARGET_LIGHT
82 kNormal_Hinting -> <default, no option>
83 kFull_Hinting -> <same as kNormalHinting, unless we are rendering
84 subpixel glyphs, in which case TARGET_LCD or
90 kNormal_Hinting = 2, //!< this is the default
94 Hinting getHinting() const {
95 return static_cast<Hinting>(fBitfields.fHinting);
98 void setHinting(Hinting hintingLevel);
100 /** Specifies the bit values that are stored in the paint's flags.
103 kAntiAlias_Flag = 0x01, //!< mask to enable antialiasing
104 kDither_Flag = 0x04, //!< mask to enable dithering
105 kUnderlineText_Flag = 0x08, //!< mask to enable underline text
106 kStrikeThruText_Flag = 0x10, //!< mask to enable strike-thru text
107 kFakeBoldText_Flag = 0x20, //!< mask to enable fake-bold text
108 kLinearText_Flag = 0x40, //!< mask to enable linear-text
109 kSubpixelText_Flag = 0x80, //!< mask to enable subpixel text positioning
110 kDevKernText_Flag = 0x100, //!< mask to enable device kerning text
111 kLCDRenderText_Flag = 0x200, //!< mask to enable subpixel glyph renderering
112 kEmbeddedBitmapText_Flag = 0x400, //!< mask to enable embedded bitmap strikes
113 kAutoHinting_Flag = 0x800, //!< mask to force Freetype's autohinter
114 kVerticalText_Flag = 0x1000,
115 kGenA8FromLCD_Flag = 0x2000, // hack for GDI -- do not use if you can help it
116 kDistanceFieldTextTEMP_Flag = 0x4000, //!< TEMPORARY mask to enable distance fields
117 // currently overrides LCD and subpixel rendering
118 // when adding extra flags, note that the fFlags member is specified
119 // with a bit-width and you'll have to expand it.
124 /** Return the paint's flags. Use the Flag enum to test flag values.
125 @return the paint's flags (see enums ending in _Flag for bit masks)
127 uint32_t getFlags() const { return fBitfields.fFlags; }
129 /** Set the paint's flags. Use the Flag enum to specific flag values.
130 @param flags The new flag bits for the paint (see Flags enum)
132 void setFlags(uint32_t flags);
134 /** Helper for getFlags(), returning true if kAntiAlias_Flag bit is set
135 @return true if the antialias bit is set in the paint's flags.
137 bool isAntiAlias() const {
138 return SkToBool(this->getFlags() & kAntiAlias_Flag);
141 /** Helper for setFlags(), setting or clearing the kAntiAlias_Flag bit
142 @param aa true to enable antialiasing, false to disable it
144 void setAntiAlias(bool aa);
146 /** Helper for getFlags(), returning true if kDither_Flag bit is set
147 @return true if the dithering bit is set in the paint's flags.
149 bool isDither() const {
150 return SkToBool(this->getFlags() & kDither_Flag);
153 /** Helper for setFlags(), setting or clearing the kDither_Flag bit
154 @param dither true to enable dithering, false to disable it
156 void setDither(bool dither);
158 /** Helper for getFlags(), returning true if kLinearText_Flag bit is set
159 @return true if the lineartext bit is set in the paint's flags
161 bool isLinearText() const {
162 return SkToBool(this->getFlags() & kLinearText_Flag);
165 /** Helper for setFlags(), setting or clearing the kLinearText_Flag bit
166 @param linearText true to set the linearText bit in the paint's flags,
169 void setLinearText(bool linearText);
171 /** Helper for getFlags(), returning true if kSubpixelText_Flag bit is set
172 @return true if the lineartext bit is set in the paint's flags
174 bool isSubpixelText() const {
175 return SkToBool(this->getFlags() & kSubpixelText_Flag);
179 * Helper for setFlags(), setting or clearing the kSubpixelText_Flag.
180 * @param subpixelText true to set the subpixelText bit in the paint's
181 * flags, false to clear it.
183 void setSubpixelText(bool subpixelText);
185 bool isLCDRenderText() const {
186 return SkToBool(this->getFlags() & kLCDRenderText_Flag);
190 * Helper for setFlags(), setting or clearing the kLCDRenderText_Flag.
191 * Note: antialiasing must also be on for lcd rendering
192 * @param lcdText true to set the LCDRenderText bit in the paint's flags,
195 void setLCDRenderText(bool lcdText);
197 bool isEmbeddedBitmapText() const {
198 return SkToBool(this->getFlags() & kEmbeddedBitmapText_Flag);
201 /** Helper for setFlags(), setting or clearing the kEmbeddedBitmapText_Flag bit
202 @param useEmbeddedBitmapText true to set the kEmbeddedBitmapText bit in the paint's flags,
205 void setEmbeddedBitmapText(bool useEmbeddedBitmapText);
207 bool isAutohinted() const {
208 return SkToBool(this->getFlags() & kAutoHinting_Flag);
211 /** Helper for setFlags(), setting or clearing the kAutoHinting_Flag bit
212 @param useAutohinter true to set the kEmbeddedBitmapText bit in the
216 void setAutohinted(bool useAutohinter);
218 bool isVerticalText() const {
219 return SkToBool(this->getFlags() & kVerticalText_Flag);
223 * Helper for setting or clearing the kVerticalText_Flag bit in
226 * If this bit is set, then advances are treated as Y values rather than
227 * X values, and drawText will places its glyphs vertically rather than
230 void setVerticalText(bool);
232 /** Helper for getFlags(), returning true if kUnderlineText_Flag bit is set
233 @return true if the underlineText bit is set in the paint's flags.
235 bool isUnderlineText() const {
236 return SkToBool(this->getFlags() & kUnderlineText_Flag);
239 /** Helper for setFlags(), setting or clearing the kUnderlineText_Flag bit
240 @param underlineText true to set the underlineText bit in the paint's
241 flags, false to clear it.
243 void setUnderlineText(bool underlineText);
245 /** Helper for getFlags(), returns true if kStrikeThruText_Flag bit is set
246 @return true if the strikeThruText bit is set in the paint's flags.
248 bool isStrikeThruText() const {
249 return SkToBool(this->getFlags() & kStrikeThruText_Flag);
252 /** Helper for setFlags(), setting or clearing the kStrikeThruText_Flag bit
253 @param strikeThruText true to set the strikeThruText bit in the
254 paint's flags, false to clear it.
256 void setStrikeThruText(bool strikeThruText);
258 /** Helper for getFlags(), returns true if kFakeBoldText_Flag bit is set
259 @return true if the kFakeBoldText_Flag bit is set in the paint's flags.
261 bool isFakeBoldText() const {
262 return SkToBool(this->getFlags() & kFakeBoldText_Flag);
265 /** Helper for setFlags(), setting or clearing the kFakeBoldText_Flag bit
266 @param fakeBoldText true to set the kFakeBoldText_Flag bit in the paint's
267 flags, false to clear it.
269 void setFakeBoldText(bool fakeBoldText);
271 /** Helper for getFlags(), returns true if kDevKernText_Flag bit is set
272 @return true if the kernText bit is set in the paint's flags.
274 bool isDevKernText() const {
275 return SkToBool(this->getFlags() & kDevKernText_Flag);
278 /** Helper for setFlags(), setting or clearing the kKernText_Flag bit
279 @param kernText true to set the kKernText_Flag bit in the paint's
280 flags, false to clear it.
282 void setDevKernText(bool devKernText);
284 /** Helper for getFlags(), returns true if kDistanceFieldTextTEMP_Flag bit is set
285 @return true if the distanceFieldText bit is set in the paint's flags.
287 bool isDistanceFieldTextTEMP() const {
288 return SkToBool(this->getFlags() & kDistanceFieldTextTEMP_Flag);
291 /** Helper for setFlags(), setting or clearing the kDistanceFieldTextTEMP_Flag bit
292 @param distanceFieldText true to set the kDistanceFieldTextTEMP_Flag bit in the paint's
293 flags, false to clear it.
295 void setDistanceFieldTextTEMP(bool distanceFieldText);
305 * Return the filter level. This affects the quality (and performance) of
306 * drawing scaled images.
308 FilterLevel getFilterLevel() const {
309 return (FilterLevel)fBitfields.fFilterLevel;
313 * Set the filter level. This affects the quality (and performance) of
314 * drawing scaled images.
316 void setFilterLevel(FilterLevel);
319 * If the predicate is true, set the filterLevel to Low, else set it to
322 SK_ATTR_DEPRECATED("use setFilterLevel")
323 void setFilterBitmap(bool doFilter) {
324 this->setFilterLevel(doFilter ? kLow_FilterLevel : kNone_FilterLevel);
328 * Returns true if getFilterLevel() returns anything other than None.
330 SK_ATTR_DEPRECATED("use getFilterLevel")
331 bool isFilterBitmap() const {
332 return kNone_FilterLevel != this->getFilterLevel();
335 /** Styles apply to rect, oval, path, and text.
336 Bitmaps are always drawn in "fill", and lines are always drawn in
339 Note: strokeandfill implicitly draws the result with
340 SkPath::kWinding_FillType, so if the original path is even-odd, the
341 results may not appear the same as if it was drawn twice, filled and
345 kFill_Style, //!< fill the geometry
346 kStroke_Style, //!< stroke the geometry
347 kStrokeAndFill_Style, //!< fill and stroke the geometry
350 kStyleCount = kStrokeAndFill_Style + 1
353 /** Return the paint's style, used for controlling how primitives'
354 geometries are interpreted (except for drawBitmap, which always assumes
356 @return the paint's Style
358 Style getStyle() const { return (Style)fBitfields.fStyle; }
360 /** Set the paint's style, used for controlling how primitives'
361 geometries are interpreted (except for drawBitmap, which always assumes
363 @param style The new style to set in the paint
365 void setStyle(Style style);
367 /** Return the paint's color. Note that the color is a 32bit value
368 containing alpha as well as r,g,b. This 32bit value is not
369 premultiplied, meaning that its alpha can be any value, regardless of
371 @return the paint's color (and alpha).
373 SkColor getColor() const { return fColor; }
375 /** Set the paint's color. Note that the color is a 32bit value containing
376 alpha as well as r,g,b. This 32bit value is not premultiplied, meaning
377 that its alpha can be any value, regardless of the values of r,g,b.
378 @param color The new color (including alpha) to set in the paint.
380 void setColor(SkColor color);
382 /** Helper to getColor() that just returns the color's alpha value.
383 @return the alpha component of the paint's color.
385 uint8_t getAlpha() const { return SkToU8(SkColorGetA(fColor)); }
387 /** Helper to setColor(), that only assigns the color's alpha value,
388 leaving its r,g,b values unchanged.
389 @param a set the alpha component (0..255) of the paint's color.
391 void setAlpha(U8CPU a);
393 /** Helper to setColor(), that takes a,r,g,b and constructs the color value
394 using SkColorSetARGB()
395 @param a The new alpha component (0..255) of the paint's color.
396 @param r The new red component (0..255) of the paint's color.
397 @param g The new green component (0..255) of the paint's color.
398 @param b The new blue component (0..255) of the paint's color.
400 void setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b);
402 /** Return the width for stroking.
404 A value of 0 strokes in hairline mode.
405 Hairlines always draw 1-pixel wide, regardless of the matrix.
406 @return the paint's stroke width, used whenever the paint's style is
407 Stroke or StrokeAndFill.
409 SkScalar getStrokeWidth() const { return fWidth; }
411 /** Set the width for stroking.
412 Pass 0 to stroke in hairline mode.
413 Hairlines always draw 1-pixel wide, regardless of the matrix.
414 @param width set the paint's stroke width, used whenever the paint's
415 style is Stroke or StrokeAndFill.
417 void setStrokeWidth(SkScalar width);
419 /** Return the paint's stroke miter value. This is used to control the
420 behavior of miter joins when the joins angle is sharp.
421 @return the paint's miter limit, used whenever the paint's style is
422 Stroke or StrokeAndFill.
424 SkScalar getStrokeMiter() const { return fMiterLimit; }
426 /** Set the paint's stroke miter value. This is used to control the
427 behavior of miter joins when the joins angle is sharp. This value must
429 @param miter set the miter limit on the paint, used whenever the
430 paint's style is Stroke or StrokeAndFill.
432 void setStrokeMiter(SkScalar miter);
434 /** Cap enum specifies the settings for the paint's strokecap. This is the
435 treatment that is applied to the beginning and end of each non-closed
436 contour (e.g. lines).
439 kButt_Cap, //!< begin/end contours with no extension
440 kRound_Cap, //!< begin/end contours with a semi-circle extension
441 kSquare_Cap, //!< begin/end contours with a half square extension
444 kDefault_Cap = kButt_Cap
447 /** Join enum specifies the settings for the paint's strokejoin. This is
448 the treatment that is applied to corners in paths and rectangles.
451 kMiter_Join, //!< connect path segments with a sharp join
452 kRound_Join, //!< connect path segments with a round join
453 kBevel_Join, //!< connect path segments with a flat bevel join
456 kDefault_Join = kMiter_Join
459 /** Return the paint's stroke cap type, controlling how the start and end
460 of stroked lines and paths are treated.
461 @return the line cap style for the paint, used whenever the paint's
462 style is Stroke or StrokeAndFill.
464 Cap getStrokeCap() const { return (Cap)fBitfields.fCapType; }
466 /** Set the paint's stroke cap type.
467 @param cap set the paint's line cap style, used whenever the paint's
468 style is Stroke or StrokeAndFill.
470 void setStrokeCap(Cap cap);
472 /** Return the paint's stroke join type.
473 @return the paint's line join style, used whenever the paint's style is
474 Stroke or StrokeAndFill.
476 Join getStrokeJoin() const { return (Join)fBitfields.fJoinType; }
478 /** Set the paint's stroke join type.
479 @param join set the paint's line join style, used whenever the paint's
480 style is Stroke or StrokeAndFill.
482 void setStrokeJoin(Join join);
485 * Applies any/all effects (patheffect, stroking) to src, returning the
486 * result in dst. The result is that drawing src with this paint will be
487 * the same as drawing dst with a default paint (at least from the
488 * geometric perspective).
490 * @param src input path
491 * @param dst output path (may be the same as src)
492 * @param cullRect If not null, the dst path may be culled to this rect.
493 * @return true if the path should be filled, or false if it should be
494 * drawn with a hairline (width == 0)
496 bool getFillPath(const SkPath& src, SkPath* dst,
497 const SkRect* cullRect = NULL) const;
499 /** Get the paint's shader object.
501 The shader's reference count is not affected.
502 @return the paint's shader (or NULL)
504 SkShader* getShader() const { return fShader; }
506 /** Set or clear the shader object.
507 * Shaders specify the source color(s) for what is being drawn. If a paint
508 * has no shader, then the paint's color is used. If the paint has a
509 * shader, then the shader's color(s) are use instead, but they are
510 * modulated by the paint's alpha. This makes it easy to create a shader
511 * once (e.g. bitmap tiling or gradient) and then change its transparency
512 * w/o having to modify the original shader... only the paint's alpha needs
515 * There is an exception to this only-respect-paint's-alpha rule: If the shader only generates
516 * alpha (e.g. SkShader::CreateBitmapShader(bitmap, ...) where bitmap's colortype is kAlpha_8)
517 * then the shader will use the paint's entire color to "colorize" its output (modulating the
518 * bitmap's alpha with the paint's color+alpha).
520 * Pass NULL to clear any previous shader.
521 * As a convenience, the parameter passed is also returned.
522 * If a previous shader exists, its reference count is decremented.
523 * If shader is not NULL, its reference count is incremented.
524 * @param shader May be NULL. The shader to be installed in the paint
527 SkShader* setShader(SkShader* shader);
529 /** Get the paint's colorfilter. If there is a colorfilter, its reference
530 count is not changed.
531 @return the paint's colorfilter (or NULL)
533 SkColorFilter* getColorFilter() const { return fColorFilter; }
535 /** Set or clear the paint's colorfilter, returning the parameter.
537 If the paint already has a filter, its reference count is decremented.
538 If filter is not NULL, its reference count is incremented.
539 @param filter May be NULL. The filter to be installed in the paint
542 SkColorFilter* setColorFilter(SkColorFilter* filter);
544 /** Get the paint's xfermode object.
546 The xfermode's reference count is not affected.
547 @return the paint's xfermode (or NULL)
549 SkXfermode* getXfermode() const { return fXfermode; }
551 /** Set or clear the xfermode object.
553 Pass NULL to clear any previous xfermode.
554 As a convenience, the parameter passed is also returned.
555 If a previous xfermode exists, its reference count is decremented.
556 If xfermode is not NULL, its reference count is incremented.
557 @param xfermode May be NULL. The new xfermode to be installed in the
561 SkXfermode* setXfermode(SkXfermode* xfermode);
563 /** Create an xfermode based on the specified Mode, and assign it into the
564 paint, returning the mode that was set. If the Mode is SrcOver, then
565 the paint's xfermode is set to null.
567 SkXfermode* setXfermodeMode(SkXfermode::Mode);
569 /** Get the paint's patheffect object.
571 The patheffect reference count is not affected.
572 @return the paint's patheffect (or NULL)
574 SkPathEffect* getPathEffect() const { return fPathEffect; }
576 /** Set or clear the patheffect object.
578 Pass NULL to clear any previous patheffect.
579 As a convenience, the parameter passed is also returned.
580 If a previous patheffect exists, its reference count is decremented.
581 If patheffect is not NULL, its reference count is incremented.
582 @param effect May be NULL. The new patheffect to be installed in the
586 SkPathEffect* setPathEffect(SkPathEffect* effect);
588 /** Get the paint's maskfilter object.
590 The maskfilter reference count is not affected.
591 @return the paint's maskfilter (or NULL)
593 SkMaskFilter* getMaskFilter() const { return fMaskFilter; }
595 /** Set or clear the maskfilter object.
597 Pass NULL to clear any previous maskfilter.
598 As a convenience, the parameter passed is also returned.
599 If a previous maskfilter exists, its reference count is decremented.
600 If maskfilter is not NULL, its reference count is incremented.
601 @param maskfilter May be NULL. The new maskfilter to be installed in
605 SkMaskFilter* setMaskFilter(SkMaskFilter* maskfilter);
607 // These attributes are for text/fonts
609 /** Get the paint's typeface object.
611 The typeface object identifies which font to use when drawing or
612 measuring text. The typeface reference count is not affected.
613 @return the paint's typeface (or NULL)
615 SkTypeface* getTypeface() const { return fTypeface; }
617 /** Set or clear the typeface object.
619 Pass NULL to clear any previous typeface.
620 As a convenience, the parameter passed is also returned.
621 If a previous typeface exists, its reference count is decremented.
622 If typeface is not NULL, its reference count is incremented.
623 @param typeface May be NULL. The new typeface to be installed in the
627 SkTypeface* setTypeface(SkTypeface* typeface);
629 /** Get the paint's rasterizer (or NULL).
631 The raster controls how paths/text are turned into alpha masks.
632 @return the paint's rasterizer (or NULL)
634 SkRasterizer* getRasterizer() const { return fRasterizer; }
636 /** Set or clear the rasterizer object.
638 Pass NULL to clear any previous rasterizer.
639 As a convenience, the parameter passed is also returned.
640 If a previous rasterizer exists in the paint, its reference count is
641 decremented. If rasterizer is not NULL, its reference count is
643 @param rasterizer May be NULL. The new rasterizer to be installed in
647 SkRasterizer* setRasterizer(SkRasterizer* rasterizer);
649 SkImageFilter* getImageFilter() const { return fImageFilter; }
650 SkImageFilter* setImageFilter(SkImageFilter*);
652 SkAnnotation* getAnnotation() const { return fAnnotation; }
653 SkAnnotation* setAnnotation(SkAnnotation*);
656 * Returns true if there is an annotation installed on this paint, and
657 * the annotation specifics no-drawing.
659 SK_ATTR_DEPRECATED("use getAnnotation and check for non-null")
660 bool isNoDrawAnnotation() const { return this->getAnnotation() != NULL; }
663 * Return the paint's SkDrawLooper (if any). Does not affect the looper's
666 SkDrawLooper* getLooper() const { return fLooper; }
669 * Set or clear the looper object.
671 * Pass NULL to clear any previous looper.
672 * As a convenience, the parameter passed is also returned.
673 * If a previous looper exists in the paint, its reference count is
674 * decremented. If looper is not NULL, its reference count is
676 * @param looper May be NULL. The new looper to be installed in the paint.
679 SkDrawLooper* setLooper(SkDrawLooper* looper);
690 /** Return the paint's Align value for drawing text.
691 @return the paint's Align value for drawing text.
693 Align getTextAlign() const { return (Align)fBitfields.fTextAlign; }
695 /** Set the paint's text alignment.
696 @param align set the paint's Align value for drawing text.
698 void setTextAlign(Align align);
700 /** Return the paint's text size.
701 @return the paint's text size.
703 SkScalar getTextSize() const { return fTextSize; }
705 /** Set the paint's text size. This value must be > 0
706 @param textSize set the paint's text size.
708 void setTextSize(SkScalar textSize);
710 /** Return the paint's horizontal scale factor for text. The default value
712 @return the paint's scale factor in X for drawing/measuring text
714 SkScalar getTextScaleX() const { return fTextScaleX; }
716 /** Set the paint's horizontal scale factor for text. The default value
717 is 1.0. Values > 1.0 will stretch the text wider. Values < 1.0 will
718 stretch the text narrower.
719 @param scaleX set the paint's scale factor in X for drawing/measuring
722 void setTextScaleX(SkScalar scaleX);
724 /** Return the paint's horizontal skew factor for text. The default value
726 @return the paint's skew factor in X for drawing text.
728 SkScalar getTextSkewX() const { return fTextSkewX; }
730 /** Set the paint's horizontal skew factor for text. The default value
731 is 0. For approximating oblique text, use values around -0.25.
732 @param skewX set the paint's skew factor in X for drawing text.
734 void setTextSkewX(SkScalar skewX);
736 /** Describes how to interpret the text parameters that are passed to paint
737 methods like measureText() and getTextWidths().
740 kUTF8_TextEncoding, //!< the text parameters are UTF8
741 kUTF16_TextEncoding, //!< the text parameters are UTF16
742 kUTF32_TextEncoding, //!< the text parameters are UTF32
743 kGlyphID_TextEncoding //!< the text parameters are glyph indices
746 TextEncoding getTextEncoding() const {
747 return (TextEncoding)fBitfields.fTextEncoding;
750 void setTextEncoding(TextEncoding encoding);
753 /** Flags which indicate the confidence level of various metrics.
754 A set flag indicates that the metric may be trusted.
756 enum FontMetricsFlags {
757 kUnderlineThinknessIsValid_Flag = 1 << 0,
758 kUnderlinePositionIsValid_Flag = 1 << 1,
761 uint32_t fFlags; //!< Bit field to identify which values are unknown
762 SkScalar fTop; //!< The greatest distance above the baseline for any glyph (will be <= 0)
763 SkScalar fAscent; //!< The recommended distance above the baseline (will be <= 0)
764 SkScalar fDescent; //!< The recommended distance below the baseline (will be >= 0)
765 SkScalar fBottom; //!< The greatest distance below the baseline for any glyph (will be >= 0)
766 SkScalar fLeading; //!< The recommended distance to add between lines of text (will be >= 0)
767 SkScalar fAvgCharWidth; //!< the average character width (>= 0)
768 SkScalar fMaxCharWidth; //!< the max character width (>= 0)
769 SkScalar fXMin; //!< The minimum bounding box x value for all glyphs
770 SkScalar fXMax; //!< The maximum bounding box x value for all glyphs
771 SkScalar fXHeight; //!< The height of an 'x' in px, or 0 if no 'x' in face
772 SkScalar fCapHeight; //!< The cap height (> 0), or 0 if cannot be determined.
773 SkScalar fUnderlineThickness; //!< underline thickness, or 0 if cannot be determined
775 /** Underline Position - position of the top of the Underline stroke
776 relative to the baseline, this can have following values
777 - Negative - means underline should be drawn above baseline.
778 - Positive - means below baseline.
779 - Zero - mean underline should be drawn on baseline.
781 SkScalar fUnderlinePosition; //!< underline position, or 0 if cannot be determined
783 /** If the fontmetrics has a valid underlinethickness, return true, and set the
784 thickness param to that value. If it doesn't return false and ignore the
787 bool hasUnderlineThickness(SkScalar* thickness) const {
788 if (SkToBool(fFlags & kUnderlineThinknessIsValid_Flag)) {
789 *thickness = fUnderlineThickness;
795 /** If the fontmetrics has a valid underlineposition, return true, and set the
796 thickness param to that value. If it doesn't return false and ignore the
799 bool hasUnderlinePosition(SkScalar* position) const {
800 if (SkToBool(fFlags & kUnderlinePositionIsValid_Flag)) {
801 *position = fUnderlinePosition;
809 /** Return the recommend spacing between lines (which will be
810 fDescent - fAscent + fLeading).
811 If metrics is not null, return in it the font metrics for the
812 typeface/pointsize/etc. currently set in the paint.
813 @param metrics If not null, returns the font metrics for the
814 current typeface/pointsize/etc setting in this
816 @param scale If not 0, return width as if the canvas were scaled
818 @param return the recommended spacing between lines
820 SkScalar getFontMetrics(FontMetrics* metrics, SkScalar scale = 0) const;
822 /** Return the recommend line spacing. This will be
823 fDescent - fAscent + fLeading
825 SkScalar getFontSpacing() const { return this->getFontMetrics(NULL, 0); }
827 /** Convert the specified text into glyph IDs, returning the number of
828 glyphs ID written. If glyphs is NULL, it is ignore and only the count
831 int textToGlyphs(const void* text, size_t byteLength,
832 uint16_t glyphs[]) const;
834 /** Return true if all of the specified text has a corresponding non-zero
835 glyph ID. If any of the code-points in the text are not supported in
836 the typeface (i.e. the glyph ID would be zero), then return false.
838 If the text encoding for the paint is kGlyph_TextEncoding, then this
839 returns true if all of the specified glyph IDs are non-zero.
841 bool containsText(const void* text, size_t byteLength) const;
843 /** Convert the glyph array into Unichars. Unconvertable glyphs are mapped
844 to zero. Note: this does not look at the text-encoding setting in the
845 paint, only at the typeface.
847 void glyphsToUnichars(const uint16_t glyphs[], int count,
848 SkUnichar text[]) const;
850 /** Return the number of drawable units in the specified text buffer.
851 This looks at the current TextEncoding field of the paint. If you also
852 want to have the text converted into glyph IDs, call textToGlyphs
855 int countText(const void* text, size_t byteLength) const {
856 return this->textToGlyphs(text, byteLength, NULL);
859 /** Return the width of the text. This will return the vertical measure
860 * if isVerticalText() is true, in which case the returned value should
861 * be treated has a height instead of a width.
863 * @param text The text to be measured
864 * @param length Number of bytes of text to measure
865 * @param bounds If not NULL, returns the bounds of the text,
866 * relative to (0, 0).
867 * @return The advance width of the text
869 SkScalar measureText(const void* text, size_t length, SkRect* bounds) const;
871 /** Return the width of the text. This will return the vertical measure
872 * if isVerticalText() is true, in which case the returned value should
873 * be treated has a height instead of a width.
875 * @param text Address of the text
876 * @param length Number of bytes of text to measure
877 * @return The advance width of the text
879 SkScalar measureText(const void* text, size_t length) const {
880 return this->measureText(text, length, NULL);
883 /** Return the number of bytes of text that were measured. If
884 * isVerticalText() is true, then the vertical advances are used for
887 * @param text The text to be measured
888 * @param length Number of bytes of text to measure
889 * @param maxWidth Maximum width. Only the subset of text whose accumulated
890 * widths are <= maxWidth are measured.
891 * @param measuredWidth Optional. If non-null, this returns the actual
892 * width of the measured text.
893 * @return The number of bytes of text that were measured. Will be
896 size_t breakText(const void* text, size_t length, SkScalar maxWidth,
897 SkScalar* measuredWidth = NULL) const;
899 /** Return the advances for the text. These will be vertical advances if
900 * isVerticalText() returns true.
902 * @param text the text
903 * @param byteLength number of bytes to of text
904 * @param widths If not null, returns the array of advances for
905 * the glyphs. If not NULL, must be at least a large
906 * as the number of unichars in the specified text.
907 * @param bounds If not null, returns the bounds for each of
908 * character, relative to (0, 0)
909 * @return the number of unichars in the specified text.
911 int getTextWidths(const void* text, size_t byteLength, SkScalar widths[],
912 SkRect bounds[] = NULL) const;
914 /** Return the path (outline) for the specified text.
915 Note: just like SkCanvas::drawText, this will respect the Align setting
918 void getTextPath(const void* text, size_t length, SkScalar x, SkScalar y,
921 void getPosTextPath(const void* text, size_t length,
922 const SkPoint pos[], SkPath* path) const;
924 // returns true if the paint's settings (e.g. xfermode + alpha) resolve to
925 // mean that we need not draw at all (e.g. SrcOver + 0-alpha)
926 bool nothingToDraw() const;
928 ///////////////////////////////////////////////////////////////////////////
929 // would prefer to make these private...
931 /** Returns true if the current paint settings allow for fast computation of
932 bounds (i.e. there is nothing complex like a patheffect that would make
933 the bounds computation expensive.
935 bool canComputeFastBounds() const {
936 if (this->getLooper()) {
937 return this->getLooper()->canComputeFastBounds(*this);
939 return !this->getRasterizer();
942 /** Only call this if canComputeFastBounds() returned true. This takes a
943 raw rectangle (the raw bounds of a shape), and adjusts it for stylistic
944 effects in the paint (e.g. stroking). If needed, it uses the storage
945 rect parameter. It returns the adjusted bounds that can then be used
946 for quickReject tests.
948 The returned rect will either be orig or storage, thus the caller
949 should not rely on storage being set to the result, but should always
950 use the retured value. It is legal for orig and storage to be the same
954 if (paint.canComputeFastBounds()) {
956 path.computeBounds(&r, SkPath::kFast_BoundsType);
957 const SkRect& fastR = paint.computeFastBounds(r, &storage);
958 if (canvas->quickReject(fastR, ...)) {
959 // don't draw the path
963 const SkRect& computeFastBounds(const SkRect& orig, SkRect* storage) const {
964 SkPaint::Style style = this->getStyle();
965 // ultra fast-case: filling with no effects that affect geometry
966 if (kFill_Style == style) {
967 uintptr_t effects = reinterpret_cast<uintptr_t>(this->getLooper());
968 effects |= reinterpret_cast<uintptr_t>(this->getMaskFilter());
969 effects |= reinterpret_cast<uintptr_t>(this->getPathEffect());
970 effects |= reinterpret_cast<uintptr_t>(this->getImageFilter());
976 return this->doComputeFastBounds(orig, storage, style);
979 const SkRect& computeFastStrokeBounds(const SkRect& orig,
980 SkRect* storage) const {
981 return this->doComputeFastBounds(orig, storage, kStroke_Style);
984 // Take the style explicitly, so the caller can force us to be stroked
985 // without having to make a copy of the paint just to change that field.
986 const SkRect& doComputeFastBounds(const SkRect& orig, SkRect* storage,
990 * Return a matrix that applies the paint's text values: size, scale, skew
992 static SkMatrix* SetTextMatrix(SkMatrix* matrix, SkScalar size,
993 SkScalar scaleX, SkScalar skewX) {
994 matrix->setScale(size * scaleX, size);
996 matrix->postSkew(skewX, 0);
1001 SkMatrix* setTextMatrix(SkMatrix* matrix) const {
1002 return SetTextMatrix(matrix, fTextSize, fTextScaleX, fTextSkewX);
1005 SK_TO_STRING_NONVIRT()
1008 SkTypeface* fTypeface;
1009 SkPathEffect* fPathEffect;
1011 SkXfermode* fXfermode;
1012 SkMaskFilter* fMaskFilter;
1013 SkColorFilter* fColorFilter;
1014 SkRasterizer* fRasterizer;
1015 SkDrawLooper* fLooper;
1016 SkImageFilter* fImageFilter;
1017 SkAnnotation* fAnnotation;
1020 SkScalar fTextScaleX;
1021 SkScalar fTextSkewX;
1024 SkScalar fMiterLimit;
1027 // all of these bitfields should add up to 32
1028 unsigned fFlags : 16;
1029 unsigned fTextAlign : 2;
1030 unsigned fCapType : 2;
1031 unsigned fJoinType : 2;
1032 unsigned fStyle : 2;
1033 unsigned fTextEncoding : 2; // 3 values
1034 unsigned fHinting : 2;
1035 unsigned fFilterLevel : 2;
1036 //unsigned fFreeBits : 2;
1038 uint32_t fBitfieldsUInt;
1041 SkDrawCacheProc getDrawCacheProc() const;
1042 SkMeasureCacheProc getMeasureCacheProc(bool needFullMetrics) const;
1044 SkScalar measure_text(SkGlyphCache*, const char* text, size_t length,
1045 int* count, SkRect* bounds) const;
1047 SkGlyphCache* detachCache(const SkDeviceProperties* deviceProperties, const SkMatrix*,
1048 bool ignoreGamma) const;
1050 void descriptorProc(const SkDeviceProperties* deviceProperties, const SkMatrix* deviceMatrix,
1051 void (*proc)(SkTypeface*, const SkDescriptor*, void*),
1052 void* context, bool ignoreGamma = false) const;
1057 /* This is the size we use when we ask for a glyph's path. We then
1058 * post-transform it as we draw to match the request.
1059 * This is done to try to re-use cache entries for the path.
1061 * This value is somewhat arbitrary. In theory, it could be 1, since
1062 * we store paths as floats. However, we get the path from the font
1063 * scaler, and it may represent its paths as fixed-point (or 26.6),
1064 * so we shouldn't ask for something too big (might overflow 16.16)
1065 * or too small (underflow 26.6).
1067 * This value could track kMaxSizeForGlyphCache, assuming the above
1068 * constraints, but since we ask for unhinted paths, the two values
1069 * need not match per-se.
1071 kCanonicalTextSizeForPaths = 64,
1074 * Above this size (taking into account CTM and textSize), we never use
1075 * the cache for bits or metrics (we might overflow), so we just ask
1076 * for a caononical size and post-transform that.
1078 kMaxSizeForGlyphCache = 256,
1081 static bool TooBigToUseCache(const SkMatrix& ctm, const SkMatrix& textM);
1083 // Set flags/hinting/textSize up to use for drawing text as paths.
1084 // Returns scale factor to restore the original textSize, since will will
1085 // have change it to kCanonicalTextSizeForPaths.
1086 SkScalar setupForAsPaths();
1088 static SkScalar MaxCacheSize2() {
1089 static const SkScalar kMaxSize = SkIntToScalar(kMaxSizeForGlyphCache);
1090 static const SkScalar kMag2Max = kMaxSize * kMaxSize;
1094 friend class SkAutoGlyphCache;
1095 friend class SkAutoGlyphCacheNoGamma;
1096 friend class SkCanvas;
1097 friend class SkDraw;
1098 friend class SkGraphics; // So Term() can be called.
1099 friend class SkPDFDevice;
1100 friend class GrBitmapTextContext;
1101 friend class GrDistanceFieldTextContext;
1102 friend class GrStencilAndCoverTextContext;
1103 friend class GrPathRendering;
1104 friend class GrGLPathRendering;
1105 friend class SkTextToPathIter;
1106 friend class SkCanonicalizePaint;