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      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 "Color.h"
     31 #include "PlatformString.h"
     32 #include <wtf/Assertions.h>
     33 
     34 namespace WebCore {
     35 
     36     class CanvasGradient;
     37     class CanvasPattern;
     38     class Document;
     39     class GraphicsContext;
     40     class HTMLCanvasElement;
     41 
     42     class CanvasStyle : public RefCounted<CanvasStyle> {
     43     public:
     44         static PassRefPtr<CanvasStyle> createFromRGBA(RGBA32 rgba) { return adoptRef(new CanvasStyle(rgba)); }
     45         static PassRefPtr<CanvasStyle> createFromString(const String& color, Document* = 0);
     46         static PassRefPtr<CanvasStyle> createFromStringWithOverrideAlpha(const String& color, float alpha);
     47         static PassRefPtr<CanvasStyle> createFromGrayLevelWithAlpha(float grayLevel, float alpha) { return adoptRef(new CanvasStyle(grayLevel, alpha)); }
     48         static PassRefPtr<CanvasStyle> createFromRGBAChannels(float r, float g, float b, float a) { return adoptRef(new CanvasStyle(r, g, b, 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 
     53         bool isCurrentColor() const { return m_type == CurrentColor || m_type == CurrentColorWithOverrideAlpha; }
     54         bool hasOverrideAlpha() const { return m_type == CurrentColorWithOverrideAlpha; }
     55         float overrideAlpha() const { ASSERT(m_type == CurrentColorWithOverrideAlpha); return m_overrideAlpha; }
     56 
     57         String color() const { ASSERT(m_type == RGBA || m_type == CMYKA); return Color(m_rgba).serialized(); }
     58         CanvasGradient* canvasGradient() const { return m_gradient.get(); }
     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 {
     90             CMYKAValues() {}
     91             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