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
39 using namespace std;
40
41 namespace WebCore {
42
preferHarfBuzz(const Font * font)43 static bool preferHarfBuzz(const Font* font)
44 {
45 const FontDescription& description = font->fontDescription();
46 return description.featureSettings() && description.featureSettings()->size() > 0;
47 }
48
selectionRectForComplexText(const TextRun & run,const FloatPoint & point,int h,int from,int to) const49 FloatRect 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
getGlyphsAndAdvancesForComplexText(const TextRunPaintInfo & runInfo,GlyphBuffer & glyphBuffer,ForTextEmphasisOrNot forTextEmphasis) const72 float 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
drawComplexText(GraphicsContext * context,const TextRunPaintInfo & runInfo,const FloatPoint & point) const95 void 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
drawEmphasisMarksForComplexText(GraphicsContext * context,const TextRunPaintInfo & runInfo,const AtomicString & mark,const FloatPoint & point) const120 void 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
floatWidthForComplexText(const TextRun & run,HashSet<const SimpleFontData * > * fallbackFonts,IntRectExtent * glyphBounds) const131 float 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
offsetForPositionForComplexText(const TextRun & run,float x,bool includePartialGlyphs) const147 int 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
fontDataForCombiningCharacterSequence(const UChar * characters,size_t length,FontDataVariant variant) const158 const 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