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| 1 /* | |
| 2 * Copyright (c) 2007, 2008, 2010 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 #include "config.h" | |
| 32 #include "core/platform/graphics/Font.h" | |
| 33 | |
| 34 #include "platform/NotImplemented.h" | |
| 35 #include "core/platform/graphics/GraphicsContext.h" | |
| 36 #include "core/platform/graphics/SimpleFontData.h" | |
| 37 #include "core/platform/graphics/harfbuzz/HarfBuzzShaper.h" | |
| 38 #include "platform/fonts/GlyphBuffer.h" | |
| 39 #include "platform/geometry/FloatRect.h" | |
| 40 | |
| 41 #include "SkPaint.h" | |
| 42 #include "SkTemplates.h" | |
| 43 | |
| 44 #include "wtf/unicode/Unicode.h" | |
| 45 | |
| 46 namespace WebCore { | |
| 47 | |
| 48 bool Font::canReturnFallbackFontsForComplexText() | |
| 49 { | |
| 50 return false; | |
| 51 } | |
| 52 | |
| 53 bool Font::canExpandAroundIdeographsInComplexText() | |
| 54 { | |
| 55 return false; | |
| 56 } | |
| 57 | |
| 58 | |
| 59 static void paintGlyphs(GraphicsContext* gc, const SimpleFontData* font, | |
| 60 const GlyphBufferGlyph* glyphs, unsigned numGlyphs, | |
| 61 SkPoint* pos, const FloatRect& textRect) | |
| 62 { | |
| 63 TextDrawingModeFlags textMode = gc->textDrawingMode(); | |
| 64 | |
| 65 // We draw text up to two times (once for fill, once for stroke). | |
| 66 if (textMode & TextModeFill) { | |
| 67 SkPaint paint; | |
| 68 gc->setupPaintForFilling(&paint); | |
| 69 font->platformData().setupPaint(&paint, gc); | |
| 70 gc->adjustTextRenderMode(&paint); | |
| 71 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
| 72 | |
| 73 gc->drawPosText(glyphs, numGlyphs << 1, pos, textRect, paint); | |
| 74 } | |
| 75 | |
| 76 if ((textMode & TextModeStroke) | |
| 77 && gc->strokeStyle() != NoStroke | |
| 78 && gc->strokeThickness() > 0) { | |
| 79 | |
| 80 SkPaint paint; | |
| 81 gc->setupPaintForStroking(&paint); | |
| 82 font->platformData().setupPaint(&paint, gc); | |
| 83 gc->adjustTextRenderMode(&paint); | |
| 84 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
| 85 | |
| 86 if (textMode & TextModeFill) { | |
| 87 // If we also filled, we don't want to draw shadows twice. | |
| 88 // See comment in FontChromiumWin.cpp::paintSkiaText() for more deta
ils. | |
| 89 // Since we use the looper for shadows, we remove it (if any) now. | |
| 90 paint.setLooper(0); | |
| 91 } | |
| 92 | |
| 93 gc->drawPosText(glyphs, numGlyphs << 1, pos, textRect, paint); | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font, | |
| 98 const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs, | |
| 99 const FloatPoint& point, const FloatRect& textRect) const | |
| 100 { | |
| 101 SkASSERT(sizeof(GlyphBufferGlyph) == sizeof(uint16_t)); // compile-time asse
rt | |
| 102 | |
| 103 SkScalar x = SkFloatToScalar(point.x()); | |
| 104 SkScalar y = SkFloatToScalar(point.y()); | |
| 105 | |
| 106 SkAutoSTMalloc<32, SkPoint> storage(numGlyphs); | |
| 107 SkPoint* pos = storage.get(); | |
| 108 | |
| 109 const OpenTypeVerticalData* verticalData = font->verticalData(); | |
| 110 if (font->platformData().orientation() == Vertical && verticalData) { | |
| 111 AffineTransform savedMatrix = gc->getCTM(); | |
| 112 gc->concatCTM(AffineTransform(0, -1, 1, 0, point.x(), point.y())); | |
| 113 gc->concatCTM(AffineTransform(1, 0, 0, 1, -point.x(), -point.y())); | |
| 114 | |
| 115 const unsigned kMaxBufferLength = 256; | |
| 116 Vector<FloatPoint, kMaxBufferLength> translations; | |
| 117 | |
| 118 const FontMetrics& metrics = font->fontMetrics(); | |
| 119 SkScalar verticalOriginX = SkFloatToScalar(point.x() + metrics.floatAsce
nt() - metrics.floatAscent(IdeographicBaseline)); | |
| 120 float horizontalOffset = point.x(); | |
| 121 | |
| 122 unsigned glyphIndex = 0; | |
| 123 while (glyphIndex < numGlyphs) { | |
| 124 unsigned chunkLength = std::min(kMaxBufferLength, numGlyphs - glyphI
ndex); | |
| 125 | |
| 126 const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from + glyphInde
x); | |
| 127 translations.resize(chunkLength); | |
| 128 verticalData->getVerticalTranslationsForGlyphs(font, &glyphs[0], chu
nkLength, reinterpret_cast<float*>(&translations[0])); | |
| 129 | |
| 130 x = verticalOriginX; | |
| 131 y = SkFloatToScalar(point.y() + horizontalOffset - point.x()); | |
| 132 | |
| 133 float currentWidth = 0; | |
| 134 for (unsigned i = 0; i < chunkLength; ++i, ++glyphIndex) { | |
| 135 pos[i].set( | |
| 136 x + SkIntToScalar(lroundf(translations[i].x())), | |
| 137 y + -SkIntToScalar(-lroundf(currentWidth - translations[i].y
()))); | |
| 138 currentWidth += glyphBuffer.advanceAt(from + glyphIndex); | |
| 139 } | |
| 140 horizontalOffset += currentWidth; | |
| 141 paintGlyphs(gc, font, glyphs, chunkLength, pos, textRect); | |
| 142 } | |
| 143 | |
| 144 gc->setCTM(savedMatrix); | |
| 145 return; | |
| 146 } | |
| 147 | |
| 148 // FIXME: text rendering speed: | |
| 149 // Android has code in their WebCore fork to special case when the | |
| 150 // GlyphBuffer has no advances other than the defaults. In that case the | |
| 151 // text drawing can proceed faster. However, it's unclear when those | |
| 152 // patches may be upstreamed to WebKit so we always use the slower path | |
| 153 // here. | |
| 154 const GlyphBufferAdvance* adv = glyphBuffer.advances(from); | |
| 155 for (unsigned i = 0; i < numGlyphs; i++) { | |
| 156 pos[i].set(x, y); | |
| 157 x += SkFloatToScalar(adv[i].width()); | |
| 158 y += SkFloatToScalar(adv[i].height()); | |
| 159 } | |
| 160 | |
| 161 const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from); | |
| 162 paintGlyphs(gc, font, glyphs, numGlyphs, pos, textRect); | |
| 163 } | |
| 164 | |
| 165 void Font::drawComplexText(GraphicsContext* gc, const TextRunPaintInfo& runInfo,
const FloatPoint& point) const | |
| 166 { | |
| 167 if (!runInfo.run.length()) | |
| 168 return; | |
| 169 | |
| 170 TextDrawingModeFlags textMode = gc->textDrawingMode(); | |
| 171 bool fill = textMode & TextModeFill; | |
| 172 bool stroke = (textMode & TextModeStroke) | |
| 173 && gc->strokeStyle() != NoStroke | |
| 174 && gc->strokeThickness() > 0; | |
| 175 | |
| 176 if (!fill && !stroke) | |
| 177 return; | |
| 178 | |
| 179 GlyphBuffer glyphBuffer; | |
| 180 HarfBuzzShaper shaper(this, runInfo.run); | |
| 181 shaper.setDrawRange(runInfo.from, runInfo.to); | |
| 182 if (!shaper.shape(&glyphBuffer)) | |
| 183 return; | |
| 184 FloatPoint adjustedPoint = shaper.adjustStartPoint(point); | |
| 185 drawGlyphBuffer(gc, runInfo, glyphBuffer, adjustedPoint); | |
| 186 } | |
| 187 | |
| 188 void Font::drawEmphasisMarksForComplexText(GraphicsContext* /* context */, const
TextRunPaintInfo& /* runInfo */, const AtomicString& /* mark */, const FloatPoi
nt& /* point */) const | |
| 189 { | |
| 190 notImplemented(); | |
| 191 } | |
| 192 | |
| 193 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFon
tData*>* /* fallbackFonts */, GlyphOverflow* /* glyphOverflow */) const | |
| 194 { | |
| 195 HarfBuzzShaper shaper(this, run); | |
| 196 if (!shaper.shape()) | |
| 197 return 0; | |
| 198 return shaper.totalWidth(); | |
| 199 } | |
| 200 | |
| 201 // Return the code point index for the given |x| offset into the text run. | |
| 202 int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, | |
| 203 bool includePartialGlyphs) const | |
| 204 { | |
| 205 HarfBuzzShaper shaper(this, run); | |
| 206 if (!shaper.shape()) | |
| 207 return 0; | |
| 208 return shaper.offsetForPosition(xFloat); | |
| 209 } | |
| 210 | |
| 211 // Return the rectangle for selecting the given range of code-points in the Text
Run. | |
| 212 FloatRect Font::selectionRectForComplexText(const TextRun& run, | |
| 213 const FloatPoint& point, int height, | |
| 214 int from, int to) const | |
| 215 { | |
| 216 HarfBuzzShaper shaper(this, run); | |
| 217 if (!shaper.shape()) | |
| 218 return FloatRect(); | |
| 219 return shaper.selectionRect(point, height, from, to); | |
| 220 } | |
| 221 | |
| 222 } // namespace WebCore | |
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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