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 "wtf/Assertions.h" 32 #include "wtf/RefCounted.h" 33 #include "wtf/text/WTFString.h" 34 35 namespace WebCore { 36 37 class CanvasGradient; 38 class CanvasPattern; 39 class GraphicsContext; 40 class HTMLCanvasElement; 41 42 class CanvasStyle : public RefCounted<CanvasStyle> { 43 public: createFromRGBA(RGBA32 rgba)44 static PassRefPtr<CanvasStyle> createFromRGBA(RGBA32 rgba) { return adoptRef(new CanvasStyle(rgba)); } 45 static PassRefPtr<CanvasStyle> createFromString(const String& color); 46 static PassRefPtr<CanvasStyle> createFromStringWithOverrideAlpha(const String& color, float alpha); createFromGrayLevelWithAlpha(float grayLevel,float alpha)47 static PassRefPtr<CanvasStyle> createFromGrayLevelWithAlpha(float grayLevel, float alpha) { return adoptRef(new CanvasStyle(grayLevel, alpha)); } createFromRGBAChannels(float r,float g,float b,float a)48 static PassRefPtr<CanvasStyle> createFromRGBAChannels(float r, float g, float b, float a) { return adoptRef(new CanvasStyle(r, g, b, a)); } createFromCMYKAChannels(float c,float m,float y,float k,float a)49 static PassRefPtr<CanvasStyle> createFromCMYKAChannels(float c, float m, float y, float k, float a) { return adoptRef(new CanvasStyle(c, m, y, k, a)); } 50 static PassRefPtr<CanvasStyle> createFromGradient(PassRefPtr<CanvasGradient>); 51 static PassRefPtr<CanvasStyle> createFromPattern(PassRefPtr<CanvasPattern>); 52 isCurrentColor()53 bool isCurrentColor() const { return m_type == CurrentColor || m_type == CurrentColorWithOverrideAlpha; } hasOverrideAlpha()54 bool hasOverrideAlpha() const { return m_type == CurrentColorWithOverrideAlpha; } overrideAlpha()55 float overrideAlpha() const { ASSERT(m_type == CurrentColorWithOverrideAlpha); return m_overrideAlpha; } 56 color()57 String color() const { ASSERT(m_type == RGBA || m_type == CMYKA); return Color(m_rgba).serialized(); } canvasGradient()58 CanvasGradient* canvasGradient() const { return m_gradient.get(); } canvasPattern()59 CanvasPattern* canvasPattern() const { return m_pattern.get(); } 60 61 void applyFillColor(GraphicsContext*); 62 void applyStrokeColor(GraphicsContext*); 63 64 bool isEquivalentColor(const CanvasStyle&) const; 65 bool isEquivalentRGBA(float r, float g, float b, float a) const; 66 bool isEquivalentCMYKA(float c, float m, float y, float k, float a) const; 67 68 private: 69 enum Type { RGBA, CMYKA, Gradient, ImagePattern, CurrentColor, CurrentColorWithOverrideAlpha }; 70 71 CanvasStyle(Type, float overrideAlpha = 0); 72 CanvasStyle(RGBA32 rgba); 73 CanvasStyle(float grayLevel, float alpha); 74 CanvasStyle(float r, float g, float b, float a); 75 CanvasStyle(float c, float m, float y, float k, float a); 76 CanvasStyle(PassRefPtr<CanvasGradient>); 77 CanvasStyle(PassRefPtr<CanvasPattern>); 78 79 Type m_type; 80 81 union { 82 RGBA32 m_rgba; 83 float m_overrideAlpha; 84 }; 85 86 RefPtr<CanvasGradient> m_gradient; 87 RefPtr<CanvasPattern> m_pattern; 88 89 struct CMYKAValues { CMYKAValuesCMYKAValues90 CMYKAValues() : c(0), m(0), y(0), k(0), a(0) { } CMYKAValuesCMYKAValues91 CMYKAValues(float cyan, float magenta, float yellow, float black, float alpha) : c(cyan), m(magenta), y(yellow), k(black), a(alpha) { } 92 float c; 93 float m; 94 float y; 95 float k; 96 float a; 97 } m_cmyka; 98 }; 99 100 RGBA32 currentColor(HTMLCanvasElement*); 101 bool parseColorOrCurrentColor(RGBA32& parsedColor, const String& colorString, HTMLCanvasElement*); 102 103 } // namespace WebCore 104 105 #endif 106