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1 /* | |
2 * Copyright (c) 2011 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 "core/platform/graphics/GraphicsContext.h" | |
35 #include "core/platform/graphics/SimpleFontData.h" | |
36 #include "platform/LayoutTestSupport.h" | |
37 #include "platform/fonts/FontSmoothingMode.h" | |
38 #include "platform/fonts/GlyphBuffer.h" | |
39 | |
40 #include "third_party/skia/include/core/SkCanvas.h" | |
41 #include "third_party/skia/include/core/SkPaint.h" | |
42 #include "third_party/skia/include/core/SkTypeface.h" | |
43 #include "third_party/skia/include/ports/SkTypeface_mac.h" | |
44 | |
45 namespace WebCore { | |
46 | |
47 bool Font::canReturnFallbackFontsForComplexText() | |
48 { | |
49 return true; | |
50 } | |
51 | |
52 bool Font::canExpandAroundIdeographsInComplexText() | |
53 { | |
54 return true; | |
55 } | |
56 | |
57 static void setupPaint(SkPaint* paint, const SimpleFontData* fontData, const Fon
t* font, bool shouldAntialias, bool shouldSmoothFonts) | |
58 { | |
59 const FontPlatformData& platformData = fontData->platformData(); | |
60 const float textSize = platformData.m_size >= 0 ? platformData.m_size : 12; | |
61 | |
62 paint->setAntiAlias(shouldAntialias); | |
63 paint->setEmbeddedBitmapText(false); | |
64 paint->setTextSize(SkFloatToScalar(textSize)); | |
65 paint->setVerticalText(platformData.orientation() == Vertical); | |
66 SkTypeface* typeface = SkCreateTypefaceFromCTFont(platformData.ctFont()); | |
67 SkAutoUnref autoUnref(typeface); | |
68 paint->setTypeface(typeface); | |
69 paint->setFakeBoldText(platformData.m_syntheticBold); | |
70 paint->setTextSkewX(platformData.m_syntheticOblique ? -SK_Scalar1 / 4 : 0); | |
71 paint->setAutohinted(false); // freetype specific | |
72 paint->setLCDRenderText(shouldSmoothFonts); | |
73 paint->setSubpixelText(true); | |
74 | |
75 #if OS(MACOSX) | |
76 // When using CoreGraphics, disable hinting when webkit-font-smoothing:antia
liased is used. | |
77 // See crbug.com/152304 | |
78 if (font->fontDescription().fontSmoothing() == Antialiased) | |
79 paint->setHinting(SkPaint::kNo_Hinting); | |
80 #endif | |
81 | |
82 if (font->fontDescription().textRenderingMode() == GeometricPrecision) | |
83 paint->setHinting(SkPaint::kNo_Hinting); | |
84 } | |
85 | |
86 // TODO: This needs to be split into helper functions to better scope the | |
87 // inputs/outputs, and reduce duplicate code. | |
88 // This issue is tracked in https://bugs.webkit.org/show_bug.cgi?id=62989 | |
89 void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font, | |
90 const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs, | |
91 const FloatPoint& point, const FloatRect& textRect) const | |
92 { | |
93 COMPILE_ASSERT(sizeof(GlyphBufferGlyph) == sizeof(uint16_t), GlyphBufferGlyp
hSize_equals_uint16_t); | |
94 | |
95 bool shouldSmoothFonts = true; | |
96 bool shouldAntialias = true; | |
97 | |
98 switch (fontDescription().fontSmoothing()) { | |
99 case Antialiased: | |
100 shouldSmoothFonts = false; | |
101 break; | |
102 case SubpixelAntialiased: | |
103 break; | |
104 case NoSmoothing: | |
105 shouldAntialias = false; | |
106 shouldSmoothFonts = false; | |
107 break; | |
108 case AutoSmoothing: | |
109 // For the AutoSmooth case, don't do anything! Keep the default settings
. | |
110 break; | |
111 } | |
112 | |
113 if (!shouldUseSmoothing() || isRunningLayoutTest()) { | |
114 shouldSmoothFonts = false; | |
115 shouldAntialias = false; | |
116 } | |
117 | |
118 const GlyphBufferGlyph* glyphs = glyphBuffer.glyphs(from); | |
119 SkScalar x = SkFloatToScalar(point.x()); | |
120 SkScalar y = SkFloatToScalar(point.y()); | |
121 | |
122 if (font->platformData().orientation() == Vertical) | |
123 y += SkFloatToScalar(font->fontMetrics().floatAscent(IdeographicBaseline
) - font->fontMetrics().floatAscent()); | |
124 // FIXME: text rendering speed: | |
125 // Android has code in their WebCore fork to special case when the | |
126 // GlyphBuffer has no advances other than the defaults. In that case the | |
127 // text drawing can proceed faster. However, it's unclear when those | |
128 // patches may be upstreamed to WebKit so we always use the slower path | |
129 // here. | |
130 const GlyphBufferAdvance* adv = glyphBuffer.advances(from); | |
131 SkAutoSTMalloc<32, SkPoint> storage(numGlyphs); | |
132 SkPoint* pos = storage.get(); | |
133 | |
134 for (unsigned i = 0; i < numGlyphs; i++) { | |
135 pos[i].set(x, y); | |
136 x += SkFloatToScalar(adv[i].width()); | |
137 y += SkFloatToScalar(adv[i].height()); | |
138 } | |
139 | |
140 if (font->platformData().orientation() == Vertical) { | |
141 gc->save(); | |
142 gc->rotate(-0.5 * SK_ScalarPI); | |
143 SkMatrix rotator; | |
144 rotator.reset(); | |
145 rotator.setRotate(90); | |
146 rotator.mapPoints(pos, numGlyphs); | |
147 } | |
148 TextDrawingModeFlags textMode = gc->textDrawingMode(); | |
149 | |
150 // We draw text up to two times (once for fill, once for stroke). | |
151 if (textMode & TextModeFill) { | |
152 SkPaint paint; | |
153 gc->setupPaintForFilling(&paint); | |
154 setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts); | |
155 gc->adjustTextRenderMode(&paint); | |
156 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
157 | |
158 gc->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, textRect, pai
nt); | |
159 } | |
160 | |
161 if ((textMode & TextModeStroke) | |
162 && gc->strokeStyle() != NoStroke | |
163 && gc->strokeThickness() > 0) { | |
164 | |
165 SkPaint paint; | |
166 gc->setupPaintForStroking(&paint); | |
167 setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts); | |
168 gc->adjustTextRenderMode(&paint); | |
169 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
170 | |
171 if (textMode & TextModeFill) { | |
172 // If we also filled, we don't want to draw shadows twice. | |
173 // See comment in FontChromiumWin.cpp::paintSkiaText() for more deta
ils. | |
174 paint.setLooper(0); | |
175 } | |
176 | |
177 gc->drawPosText(glyphs, numGlyphs * sizeof(uint16_t), pos, textRect, pai
nt); | |
178 } | |
179 if (font->platformData().orientation() == Vertical) | |
180 gc->restore(); | |
181 } | |
182 | |
183 } // namespace WebCore | |
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