1 /* 2 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved. 3 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef CanvasStyle_h 28 #define CanvasStyle_h 29 30 #include "platform/graphics/Color.h" 31 #include "platform/heap/Handle.h" 32 #include "wtf/Assertions.h" 33 #include "wtf/RefCounted.h" 34 #include "wtf/text/WTFString.h" 35 36 namespace blink { 37 38 class CanvasGradient; 39 class CanvasPattern; 40 class GraphicsContext; 41 class HTMLCanvasElement; 42 43 class CanvasStyle FINAL : public RefCountedWillBeGarbageCollected<CanvasStyle> { 44 public: 45 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromRGBA(RGBA32 rgba) { return adoptRefWillBeNoop(new CanvasStyle(rgba)); } 46 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromString(const String& color); 47 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromStringWithOverrideAlpha(const String& color, float alpha); 48 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromGrayLevelWithAlpha(float grayLevel, float alpha) { return adoptRefWillBeNoop(new CanvasStyle(grayLevel, alpha)); } 49 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromRGBAChannels(float r, float g, float b, float a) { return adoptRefWillBeNoop(new CanvasStyle(r, g, b, a)); } 50 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromCMYKAChannels(float c, float m, float y, float k, float a) { return adoptRefWillBeNoop(new CanvasStyle(c, m, y, k, a)); } 51 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromGradient(PassRefPtrWillBeRawPtr<CanvasGradient>); 52 static PassRefPtrWillBeRawPtr<CanvasStyle> createFromPattern(PassRefPtrWillBeRawPtr<CanvasPattern>); 53 54 bool isCurrentColor() const { return m_type == CurrentColor || m_type == CurrentColorWithOverrideAlpha; } 55 bool hasOverrideAlpha() const { return m_type == CurrentColorWithOverrideAlpha; } 56 float overrideAlpha() const { ASSERT(m_type == CurrentColorWithOverrideAlpha); return m_overrideAlpha; } 57 58 String color() const { ASSERT(m_type == RGBA || m_type == CMYKA); return Color(m_rgba).serialized(); } 59 CanvasGradient* canvasGradient() const { return m_gradient.get(); } 60 CanvasPattern* canvasPattern() const { return m_pattern.get(); } 61 62 void applyFillColor(GraphicsContext*); 63 void applyStrokeColor(GraphicsContext*); 64 65 bool isEquivalentColor(const CanvasStyle&) const; 66 bool isEquivalentRGBA(float r, float g, float b, float a) const; 67 bool isEquivalentCMYKA(float c, float m, float y, float k, float a) const; 68 69 void trace(Visitor*); 70 71 private: 72 enum Type { RGBA, CMYKA, Gradient, ImagePattern, CurrentColor, CurrentColorWithOverrideAlpha }; 73 74 CanvasStyle(Type, float overrideAlpha = 0); 75 CanvasStyle(RGBA32 rgba); 76 CanvasStyle(float grayLevel, float alpha); 77 CanvasStyle(float r, float g, float b, float a); 78 CanvasStyle(float c, float m, float y, float k, float a); 79 CanvasStyle(PassRefPtrWillBeRawPtr<CanvasGradient>); 80 CanvasStyle(PassRefPtrWillBeRawPtr<CanvasPattern>); 81 82 Type m_type; 83 84 union { 85 RGBA32 m_rgba; 86 float m_overrideAlpha; 87 }; 88 89 RefPtrWillBeMember<CanvasGradient> m_gradient; 90 RefPtrWillBeMember<CanvasPattern> m_pattern; 91 92 struct CMYKAValues { 93 CMYKAValues() : c(0), m(0), y(0), k(0), a(0) { } 94 CMYKAValues(float cyan, float magenta, float yellow, float black, float alpha) : c(cyan), m(magenta), y(yellow), k(black), a(alpha) { } 95 float c; 96 float m; 97 float y; 98 float k; 99 float a; 100 } m_cmyka; 101 }; 102 103 RGBA32 currentColor(HTMLCanvasElement*); 104 bool parseColorOrCurrentColor(RGBA32& parsedColor, const String& colorString, HTMLCanvasElement*); 105 106 } // namespace blink 107 108 #endif 109