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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 "platform/fonts/Font.h" | |
33 | |
34 #include "platform/LayoutTestSupport.h" | |
35 #include "platform/fonts/FontPlatformFeatures.h" | |
36 #include "platform/fonts/FontSmoothingMode.h" | |
37 #include "platform/fonts/GlyphBuffer.h" | |
38 #include "platform/fonts/SimpleFontData.h" | |
39 #include "platform/graphics/GraphicsContext.h" | |
40 | |
41 #include "third_party/skia/include/core/SkCanvas.h" | |
42 #include "third_party/skia/include/core/SkPaint.h" | |
43 #include "third_party/skia/include/core/SkTypeface.h" | |
44 | |
45 namespace blink { | |
46 | |
47 bool FontPlatformFeatures::canExpandAroundIdeographsInComplexText() | |
48 { | |
49 return true; | |
50 } | |
51 | |
52 static void setupPaint(SkPaint* paint, const SimpleFontData* fontData, const Fon
t* font, bool shouldAntialias, bool shouldSmoothFonts) | |
53 { | |
54 const FontPlatformData& platformData = fontData->platformData(); | |
55 const float textSize = platformData.m_textSize >= 0 ? platformData.m_textSiz
e : 12; | |
56 | |
57 paint->setAntiAlias(shouldAntialias); | |
58 paint->setEmbeddedBitmapText(false); | |
59 paint->setTextSize(SkFloatToScalar(textSize)); | |
60 paint->setVerticalText(platformData.orientation() == Vertical); | |
61 paint->setTypeface(platformData.typeface()); | |
62 paint->setFakeBoldText(platformData.m_syntheticBold); | |
63 paint->setTextSkewX(platformData.m_syntheticItalic ? -SK_Scalar1 / 4 : 0); | |
64 paint->setAutohinted(false); // freetype specific | |
65 paint->setLCDRenderText(shouldSmoothFonts); | |
66 paint->setSubpixelText(true); | |
67 | |
68 // When using CoreGraphics, disable hinting when webkit-font-smoothing:antia
liased is used. | |
69 // See crbug.com/152304 | |
70 if (font->fontDescription().fontSmoothing() == Antialiased || font->fontDesc
ription().textRendering() == GeometricPrecision) | |
71 paint->setHinting(SkPaint::kNo_Hinting); | |
72 } | |
73 | |
74 // TODO: This needs to be split into helper functions to better scope the | |
75 // inputs/outputs, and reduce duplicate code. | |
76 // This issue is tracked in https://bugs.webkit.org/show_bug.cgi?id=62989 | |
77 void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font, | |
78 const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs, | |
79 const FloatPoint& point, const FloatRect& textRect) const | |
80 { | |
81 bool shouldSmoothFonts = true; | |
82 bool shouldAntialias = true; | |
83 | |
84 switch (fontDescription().fontSmoothing()) { | |
85 case Antialiased: | |
86 shouldSmoothFonts = false; | |
87 break; | |
88 case SubpixelAntialiased: | |
89 break; | |
90 case NoSmoothing: | |
91 shouldAntialias = false; | |
92 shouldSmoothFonts = false; | |
93 break; | |
94 case AutoSmoothing: | |
95 // For the AutoSmooth case, don't do anything! Keep the default settings
. | |
96 break; | |
97 } | |
98 | |
99 if (LayoutTestSupport::isRunningLayoutTest()) { | |
100 shouldSmoothFonts = false; | |
101 shouldAntialias = shouldAntialias && LayoutTestSupport::isFontAntialiasi
ngEnabledForTest(); | |
102 } | |
103 | |
104 const Glyph* glyphs = glyphBuffer.glyphs(from); | |
105 SkScalar x = SkFloatToScalar(point.x()); | |
106 SkScalar y = SkFloatToScalar(point.y()); | |
107 | |
108 if (font->platformData().orientation() == Vertical) | |
109 y += SkFloatToScalar(font->fontMetrics().floatAscent(IdeographicBaseline
) - font->fontMetrics().floatAscent()); | |
110 | |
111 // FIXME: implement a no-vertical-advances fast path like FontHarfBuzz has. | |
112 | |
113 // FIXME: text rendering speed: | |
114 // Android has code in their WebCore fork to special case when the | |
115 // GlyphBuffer has no advances other than the defaults. In that case the | |
116 // text drawing can proceed faster. However, it's unclear when those | |
117 // patches may be upstreamed to WebKit so we always use the slower path | |
118 // here. | |
119 const FloatSize* adv = glyphBuffer.advances(from); | |
120 SkAutoSTMalloc<32, SkPoint> storage(numGlyphs); | |
121 SkPoint* pos = storage.get(); | |
122 | |
123 for (unsigned i = 0; i < numGlyphs; i++) { | |
124 pos[i].set(x, y); | |
125 x += SkFloatToScalar(adv[i].width()); | |
126 y += SkFloatToScalar(adv[i].height()); | |
127 } | |
128 | |
129 if (font->platformData().orientation() == Vertical) { | |
130 gc->save(); | |
131 gc->rotate(-0.5 * SK_ScalarPI); | |
132 SkMatrix rotator; | |
133 rotator.reset(); | |
134 rotator.setRotate(90); | |
135 rotator.mapPoints(pos, numGlyphs); | |
136 } | |
137 TextDrawingModeFlags textMode = gc->textDrawingMode(); | |
138 | |
139 // We draw text up to two times (once for fill, once for stroke). | |
140 if (textMode & TextModeFill) { | |
141 SkPaint paint = gc->fillPaint(); | |
142 setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts); | |
143 gc->adjustTextRenderMode(&paint); | |
144 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
145 | |
146 gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint)
; | |
147 } | |
148 | |
149 if ((textMode & TextModeStroke) | |
150 && gc->strokeStyle() != NoStroke | |
151 && gc->strokeThickness() > 0) { | |
152 | |
153 SkPaint paint = gc->strokePaint(); | |
154 setupPaint(&paint, font, this, shouldAntialias, shouldSmoothFonts); | |
155 gc->adjustTextRenderMode(&paint); | |
156 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); | |
157 | |
158 if (textMode & TextModeFill) { | |
159 // If we also filled, we don't want to draw shadows twice. | |
160 // See comment in FontHarfBuzz.cpp::paintGlyphs() for more details. | |
161 paint.setLooper(0); | |
162 } | |
163 | |
164 gc->drawPosText(glyphs, numGlyphs * sizeof(Glyph), pos, textRect, paint)
; | |
165 } | |
166 if (font->platformData().orientation() == Vertical) | |
167 gc->restore(); | |
168 } | |
169 | |
170 void Font::drawTextBlob(GraphicsContext*, const SkTextBlob*, const SkPoint&) con
st | |
171 { | |
172 // FIXME: Add text blob support to FontMac. | |
173 } | |
174 | |
175 PassTextBlobPtr Font::buildTextBlob(const GlyphBuffer& glyphBuffer, float initia
lAdvance, | |
176 const FloatRect& bounds, float& advance, bool couldUseLCD) const | |
177 { | |
178 // FIXME: Add text blob support to FontMac. | |
179 return nullptr; | |
180 } | |
181 | |
182 } // namespace blink | |
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