1/* 2 * Copyright (C) 2006, 2007, 2008, 2009 Apple 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25#include "config.h" 26#include "platform/fonts/Font.h" 27 28#include "platform/fonts/Character.h" 29#include "platform/fonts/FontFallbackList.h" 30#include "platform/fonts/GlyphBuffer.h" 31#include "platform/fonts/SimpleFontData.h" 32#include "platform/fonts/harfbuzz/HarfBuzzShaper.h" 33#include "platform/fonts/mac/ComplexTextController.h" 34#include "platform/geometry/IntRect.h" 35#include "platform/graphics/GraphicsContext.h" 36#include "platform/text/TextRun.h" 37#include "wtf/MathExtras.h" 38 39using namespace std; 40 41namespace WebCore { 42 43static bool preferHarfBuzz(const Font* font) 44{ 45 const FontDescription& description = font->fontDescription(); 46 return description.featureSettings() && description.featureSettings()->size() > 0; 47} 48 49FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h, 50 int from, int to) const 51{ 52 if (preferHarfBuzz(this)) { 53 HarfBuzzShaper shaper(this, run); 54 if (shaper.shape()) 55 return shaper.selectionRect(point, h, from, to); 56 } 57 ComplexTextController controller(this, run); 58 controller.advance(from); 59 float beforeWidth = controller.runWidthSoFar(); 60 controller.advance(to); 61 float afterWidth = controller.runWidthSoFar(); 62 63 // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning 64 if (run.rtl()) { 65 float totalWidth = controller.totalWidth(); 66 return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h); 67 } 68 69 return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h); 70} 71 72float Font::getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo& runInfo, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const 73{ 74 float initialAdvance; 75 76 ComplexTextController controller(this, runInfo.run, false, 0, forTextEmphasis); 77 controller.advance(runInfo.from); 78 float beforeWidth = controller.runWidthSoFar(); 79 controller.advance(runInfo.to, &glyphBuffer); 80 81 if (glyphBuffer.isEmpty()) 82 return 0; 83 84 float afterWidth = controller.runWidthSoFar(); 85 86 if (runInfo.run.rtl()) { 87 initialAdvance = controller.totalWidth() + controller.finalRoundingWidth() - afterWidth; 88 glyphBuffer.reverse(); 89 } else 90 initialAdvance = beforeWidth; 91 92 return initialAdvance; 93} 94 95void Font::drawComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const FloatPoint& point) const 96{ 97 if (preferHarfBuzz(this)) { 98 GlyphBuffer glyphBuffer; 99 HarfBuzzShaper shaper(this, runInfo.run); 100 shaper.setDrawRange(runInfo.from, runInfo.to); 101 if (shaper.shape(&glyphBuffer)) { 102 drawGlyphBuffer(context, runInfo, glyphBuffer, point); 103 return; 104 } 105 } 106 // This glyph buffer holds our glyphs + advances + font data for each glyph. 107 GlyphBuffer glyphBuffer; 108 109 float startX = point.x() + getGlyphsAndAdvancesForComplexText(runInfo, glyphBuffer); 110 111 // We couldn't generate any glyphs for the run. Give up. 112 if (glyphBuffer.isEmpty()) 113 return; 114 115 // Draw the glyph buffer now at the starting point returned in startX. 116 FloatPoint startPoint(startX, point.y()); 117 drawGlyphBuffer(context, runInfo, glyphBuffer, startPoint); 118} 119 120void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const 121{ 122 GlyphBuffer glyphBuffer; 123 float initialAdvance = getGlyphsAndAdvancesForComplexText(runInfo, glyphBuffer, ForTextEmphasis); 124 125 if (glyphBuffer.isEmpty()) 126 return; 127 128 drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y())); 129} 130 131float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, IntRectExtent* glyphBounds) const 132{ 133 if (preferHarfBuzz(this)) { 134 HarfBuzzShaper shaper(this, run); 135 if (shaper.shape()) 136 return shaper.totalWidth(); 137 } 138 ComplexTextController controller(this, run, true, fallbackFonts); 139 glyphBounds->setTop(floorf(-controller.minGlyphBoundingBoxY())); 140 glyphBounds->setBottom(ceilf(controller.maxGlyphBoundingBoxY())); 141 glyphBounds->setLeft(max<int>(0, floorf(-controller.minGlyphBoundingBoxX()))); 142 glyphBounds->setRight(max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.totalWidth()))); 143 144 return controller.totalWidth(); 145} 146 147int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const 148{ 149 if (preferHarfBuzz(this)) { 150 HarfBuzzShaper shaper(this, run); 151 if (shaper.shape()) 152 return shaper.offsetForPosition(x); 153 } 154 ComplexTextController controller(this, run); 155 return controller.offsetForPosition(x, includePartialGlyphs); 156} 157 158const SimpleFontData* Font::fontDataForCombiningCharacterSequence(const UChar* characters, size_t length, FontDataVariant variant) const 159{ 160 UChar32 baseCharacter; 161 size_t baseCharacterLength = 0; 162 U16_NEXT(characters, baseCharacterLength, length, baseCharacter); 163 164 GlyphData baseCharacterGlyphData = glyphDataForCharacter(baseCharacter, false, variant); 165 166 if (!baseCharacterGlyphData.glyph) 167 return 0; 168 169 if (length == baseCharacterLength) 170 return baseCharacterGlyphData.fontData; 171 172 bool triedBaseCharacterFontData = false; 173 174 unsigned i = 0; 175 for (const FontData* fontData = fontDataAt(0); fontData; fontData = fontDataAt(++i)) { 176 const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(baseCharacter); 177 if (variant == NormalVariant) { 178 if (simpleFontData->platformData().orientation() == Vertical) { 179 if (Character::isCJKIdeographOrSymbol(baseCharacter) && !simpleFontData->hasVerticalGlyphs()) { 180 variant = BrokenIdeographVariant; 181 simpleFontData = simpleFontData->brokenIdeographFontData().get(); 182 } else if (m_fontDescription.nonCJKGlyphOrientation() == NonCJKGlyphOrientationVerticalRight) { 183 SimpleFontData* verticalRightFontData = simpleFontData->verticalRightOrientationFontData().get(); 184 Glyph verticalRightGlyph = verticalRightFontData->glyphForCharacter(baseCharacter); 185 if (verticalRightGlyph == baseCharacterGlyphData.glyph) 186 simpleFontData = verticalRightFontData; 187 } else { 188 SimpleFontData* uprightFontData = simpleFontData->uprightOrientationFontData().get(); 189 Glyph uprightGlyph = uprightFontData->glyphForCharacter(baseCharacter); 190 if (uprightGlyph != baseCharacterGlyphData.glyph) 191 simpleFontData = uprightFontData; 192 } 193 } 194 } else { 195 if (const SimpleFontData* variantFontData = simpleFontData->variantFontData(m_fontDescription, variant).get()) 196 simpleFontData = variantFontData; 197 } 198 199 if (simpleFontData == baseCharacterGlyphData.fontData) 200 triedBaseCharacterFontData = true; 201 202 if (simpleFontData->canRenderCombiningCharacterSequence(characters, length)) 203 return simpleFontData; 204 } 205 206 if (!triedBaseCharacterFontData && baseCharacterGlyphData.fontData && baseCharacterGlyphData.fontData->canRenderCombiningCharacterSequence(characters, length)) 207 return baseCharacterGlyphData.fontData; 208 209 return SimpleFontData::systemFallback(); 210} 211 212} // namespace WebCore 213