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