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| 1 /* | |
| 2 * Copyright (C) 2012 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #ifndef HarfBuzzShaper_h | |
| 32 #define HarfBuzzShaper_h | |
| 33 | |
| 34 #include "hb.h" | |
| 35 #include "platform/fonts/GlyphBuffer.h" | |
| 36 #include "platform/geometry/FloatPoint.h" | |
| 37 #include "platform/graphics/TextRun.h" | |
| 38 #include "wtf/HashSet.h" | |
| 39 #include "wtf/OwnPtr.h" | |
| 40 #include "wtf/PassOwnPtr.h" | |
| 41 #include "wtf/unicode/CharacterNames.h" | |
| 42 #include "wtf/Vector.h" | |
| 43 | |
| 44 namespace WebCore { | |
| 45 | |
| 46 class Font; | |
| 47 class SimpleFontData; | |
| 48 | |
| 49 class HarfBuzzShaper FINAL { | |
| 50 public: | |
| 51 enum NormalizeMode { | |
| 52 DoNotNormalizeMirrorChars, | |
| 53 NormalizeMirrorChars | |
| 54 }; | |
| 55 | |
| 56 HarfBuzzShaper(const Font*, const TextRun&); | |
| 57 | |
| 58 void setDrawRange(int from, int to); | |
| 59 bool shape(GlyphBuffer* = 0); | |
| 60 FloatPoint adjustStartPoint(const FloatPoint&); | |
| 61 float totalWidth() { return m_totalWidth; } | |
| 62 int offsetForPosition(float targetX); | |
| 63 FloatRect selectionRect(const FloatPoint&, int height, int from, int to); | |
| 64 | |
| 65 private: | |
| 66 class HarfBuzzRun { | |
| 67 public: | |
| 68 HarfBuzzRun(const HarfBuzzRun&); | |
| 69 ~HarfBuzzRun(); | |
| 70 | |
| 71 static PassOwnPtr<HarfBuzzRun> create(const SimpleFontData* fontData, un
signed startIndex, unsigned numCharacters, TextDirection direction, hb_script_t
script) | |
| 72 { | |
| 73 return adoptPtr(new HarfBuzzRun(fontData, startIndex, numCharacters,
direction, script)); | |
| 74 } | |
| 75 | |
| 76 void applyShapeResult(hb_buffer_t*); | |
| 77 void copyShapeResultAndGlyphPositions(const HarfBuzzRun&); | |
| 78 void setGlyphAndPositions(unsigned index, uint16_t glyphId, float advanc
e, float offsetX, float offsetY); | |
| 79 void setWidth(float width) { m_width = width; } | |
| 80 | |
| 81 int characterIndexForXPosition(float targetX); | |
| 82 float xPositionForOffset(unsigned offset); | |
| 83 | |
| 84 const SimpleFontData* fontData() { return m_fontData; } | |
| 85 unsigned startIndex() const { return m_startIndex; } | |
| 86 unsigned numCharacters() const { return m_numCharacters; } | |
| 87 unsigned numGlyphs() const { return m_numGlyphs; } | |
| 88 uint16_t* glyphs() { return &m_glyphs[0]; } | |
| 89 float* advances() { return &m_advances[0]; } | |
| 90 FloatPoint* offsets() { return &m_offsets[0]; } | |
| 91 uint16_t* glyphToCharacterIndexes() { return &m_glyphToCharacterIndexes[
0]; } | |
| 92 float width() { return m_width; } | |
| 93 bool rtl() { return m_direction == RTL; } | |
| 94 hb_script_t script() { return m_script; } | |
| 95 | |
| 96 private: | |
| 97 HarfBuzzRun(const SimpleFontData*, unsigned startIndex, unsigned numChar
acters, TextDirection, hb_script_t); | |
| 98 | |
| 99 const SimpleFontData* m_fontData; | |
| 100 unsigned m_startIndex; | |
| 101 size_t m_numCharacters; | |
| 102 unsigned m_numGlyphs; | |
| 103 TextDirection m_direction; | |
| 104 hb_script_t m_script; | |
| 105 Vector<uint16_t, 256> m_glyphs; | |
| 106 Vector<float, 256> m_advances; | |
| 107 Vector<uint16_t, 256> m_glyphToCharacterIndexes; | |
| 108 Vector<FloatPoint, 256> m_offsets; | |
| 109 float m_width; | |
| 110 }; | |
| 111 | |
| 112 void setNormalizedBuffer(NormalizeMode = DoNotNormalizeMirrorChars); | |
| 113 | |
| 114 bool isWordEnd(unsigned); | |
| 115 int determineWordBreakSpacing(); | |
| 116 // setPadding sets a number of pixels to be distributed across the TextRun. | |
| 117 // WebKit uses this to justify text. | |
| 118 void setPadding(int); | |
| 119 | |
| 120 // In complex text word-spacing affects each line-break, space (U+0020) and
non-breaking space (U+00A0). | |
| 121 static bool isCodepointSpace(UChar c) { return c == ' ' || c == noBreakSpace
|| c == '\n'; } | |
| 122 | |
| 123 void setFontFeatures(); | |
| 124 | |
| 125 bool collectHarfBuzzRuns(); | |
| 126 bool shapeHarfBuzzRuns(bool shouldSetDirection); | |
| 127 bool fillGlyphBuffer(GlyphBuffer*); | |
| 128 void fillGlyphBufferFromHarfBuzzRun(GlyphBuffer*, HarfBuzzRun*, FloatPoint&
firstOffsetOfNextRun); | |
| 129 void setGlyphPositionsForHarfBuzzRun(HarfBuzzRun*, hb_buffer_t*); | |
| 130 | |
| 131 GlyphBufferAdvance createGlyphBufferAdvance(float, float); | |
| 132 | |
| 133 const Font* m_font; | |
| 134 OwnPtr<UChar[]> m_normalizedBuffer; | |
| 135 unsigned m_normalizedBufferLength; | |
| 136 const TextRun& m_run; | |
| 137 | |
| 138 int m_wordSpacingAdjustment; // Delta adjustment (pixels) for each word brea
k. | |
| 139 float m_padding; // Pixels to be distributed over the line at word breaks. | |
| 140 float m_padPerWordBreak; // Pixels to be added to each word break. | |
| 141 float m_padError; // m_padPerWordBreak might have a fractional component. Si
nce we only add a whole number of padding pixels at each word break we accumulat
e error. This is the number of pixels that we are behind so far. | |
| 142 int m_letterSpacing; // Pixels to be added after each glyph. | |
| 143 | |
| 144 Vector<hb_feature_t, 4> m_features; | |
| 145 Vector<OwnPtr<HarfBuzzRun>, 16> m_harfBuzzRuns; | |
| 146 | |
| 147 FloatPoint m_startOffset; | |
| 148 | |
| 149 int m_fromIndex; | |
| 150 int m_toIndex; | |
| 151 | |
| 152 float m_totalWidth; | |
| 153 | |
| 154 friend struct CachedShapingResults; | |
| 155 }; | |
| 156 | |
| 157 } // namespace WebCore | |
| 158 | |
| 159 #endif // HarfBuzzShaper_h | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk