1 // Copyright (C) 2013 Google Inc. All rights reserved. 2 // 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following disclaimer 11 // in the documentation and/or other materials provided with the 12 // distribution. 13 // * Neither the name of Google Inc. nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #ifndef GraphicsContextState_h 30 #define GraphicsContextState_h 31 32 #include "platform/graphics/Gradient.h" 33 #include "platform/graphics/GraphicsTypes.h" 34 #include "platform/graphics/Path.h" 35 #include "platform/graphics/Pattern.h" 36 #include "platform/graphics/StrokeData.h" 37 #include "third_party/skia/include/core/SkColorFilter.h" 38 #include "third_party/skia/include/core/SkColorPriv.h" 39 #include "third_party/skia/include/core/SkDrawLooper.h" 40 #include "third_party/skia/include/effects/SkDashPathEffect.h" 41 #include "wtf/PassOwnPtr.h" 42 #include "wtf/RefPtr.h" 43 44 namespace WebCore { 45 46 // Encapsulates the state information we store for each pushed graphics state. 47 // Only GraphicsContext can use this class. 48 class GraphicsContextState { 49 private: 50 friend class GraphicsContext; 51 52 GraphicsContextState() 53 : m_fillColor(Color::black) 54 , m_fillRule(RULE_NONZERO) 55 , m_textDrawingMode(TextModeFill) 56 , m_alpha(1) 57 , m_xferMode(0) 58 , m_compositeOperator(CompositeSourceOver) 59 , m_blendMode(blink::WebBlendModeNormal) 60 #if USE(LOW_QUALITY_IMAGE_INTERPOLATION) 61 , m_interpolationQuality(InterpolationLow) 62 #else 63 , m_interpolationQuality(InterpolationHigh) 64 #endif 65 , m_shouldAntialias(true) 66 , m_shouldSmoothFonts(true) 67 , m_shouldClampToSourceRect(true) 68 { 69 } 70 71 GraphicsContextState(const GraphicsContextState& other) 72 : m_strokeData(other.m_strokeData) 73 , m_fillColor(other.m_fillColor) 74 , m_fillRule(other.m_fillRule) 75 , m_fillGradient(other.m_fillGradient) 76 , m_fillPattern(other.m_fillPattern) 77 , m_looper(other.m_looper) 78 , m_textDrawingMode(other.m_textDrawingMode) 79 , m_alpha(other.m_alpha) 80 , m_xferMode(other.m_xferMode) 81 , m_colorFilter(other.m_colorFilter) 82 , m_compositeOperator(other.m_compositeOperator) 83 , m_blendMode(other.m_blendMode) 84 , m_interpolationQuality(other.m_interpolationQuality) 85 , m_shouldAntialias(other.m_shouldAntialias) 86 , m_shouldSmoothFonts(other.m_shouldSmoothFonts) 87 , m_shouldClampToSourceRect(other.m_shouldClampToSourceRect) 88 { 89 } 90 91 // Helper function for applying the state's alpha value to the given input 92 // color to produce a new output color. 93 SkColor applyAlpha(SkColor c) const 94 { 95 int s = roundf(m_alpha * 256); 96 if (s >= 256) 97 return c; 98 if (s < 0) 99 return 0; 100 101 int a = SkAlphaMul(SkColorGetA(c), s); 102 return (c & 0x00FFFFFF) | (a << 24); 103 } 104 105 // Returns a new State with all of this object's inherited properties copied. 106 PassOwnPtr<GraphicsContextState> clone() { return adoptPtr(new GraphicsContextState(*this)); } 107 108 // Not supported. No implementations. 109 void operator=(const GraphicsContextState&); 110 111 // Stroke. 112 StrokeData m_strokeData; 113 114 // Fill. 115 Color m_fillColor; 116 WindRule m_fillRule; 117 RefPtr<Gradient> m_fillGradient; 118 RefPtr<Pattern> m_fillPattern; 119 120 // Shadow. (This will need tweaking if we use draw loopers for other things.) 121 RefPtr<SkDrawLooper> m_looper; 122 123 // Text. (See TextModeFill & friends.) 124 TextDrawingModeFlags m_textDrawingMode; 125 126 // Common shader state. 127 float m_alpha; 128 RefPtr<SkXfermode> m_xferMode; 129 RefPtr<SkColorFilter> m_colorFilter; 130 131 // Compositing control, for the CSS and Canvas compositing spec. 132 CompositeOperator m_compositeOperator; 133 blink::WebBlendMode m_blendMode; 134 135 // Image interpolation control. 136 InterpolationQuality m_interpolationQuality; 137 138 bool m_shouldAntialias : 1; 139 bool m_shouldSmoothFonts : 1; 140 bool m_shouldClampToSourceRect : 1; 141 }; 142 143 } // namespace WebCore 144 145 #endif // GraphicsContextState_h 146 147
