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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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