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/*
* Copyright (C) 2006, 2008, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CanvasStyle_h
#define CanvasStyle_h
#include "Color.h"
#include <wtf/Assertions.h>
#include <wtf/RefCounted.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CanvasGradient;
class CanvasPattern;
class Document;
class GraphicsContext;
class HTMLCanvasElement;
class CanvasStyle {
public:
CanvasStyle();
explicit CanvasStyle(RGBA32);
CanvasStyle(float grayLevel, float alpha);
CanvasStyle(float r, float g, float b, float alpha);
CanvasStyle(float c, float m, float y, float k, float alpha);
explicit CanvasStyle(PassRefPtr<CanvasGradient>);
explicit CanvasStyle(PassRefPtr<CanvasPattern>);
~CanvasStyle();
static CanvasStyle createFromString(const String& color, Document* = 0);
static CanvasStyle createFromStringWithOverrideAlpha(const String& color, float alpha);
bool isValid() const { return m_type != Invalid; }
bool isCurrentColor() const { return m_type == CurrentColor || m_type == CurrentColorWithOverrideAlpha; }
bool hasOverrideAlpha() const { return m_type == CurrentColorWithOverrideAlpha; }
float overrideAlpha() const { ASSERT(m_type == CurrentColorWithOverrideAlpha); return m_overrideAlpha; }
String color() const;
CanvasGradient* canvasGradient() const;
CanvasPattern* canvasPattern() const;
void applyFillColor(GraphicsContext*) const;
void applyStrokeColor(GraphicsContext*) const;
bool isEquivalentColor(const CanvasStyle&) const;
bool isEquivalentRGBA(float r, float g, float b, float a) const;
bool isEquivalentCMYKA(float c, float m, float y, float k, float a) const;
CanvasStyle(const CanvasStyle&);
CanvasStyle& operator=(const CanvasStyle&);
CanvasStyle(CanvasStyle&&);
CanvasStyle& operator=(CanvasStyle&&);
private:
enum Type { RGBA, CMYKA, Gradient, ImagePattern, CurrentColor, CurrentColorWithOverrideAlpha, Invalid };
struct CMYKAValues {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(CMYKAValues);
public:
CMYKAValues() : rgba(0), c(0), m(0), y(0), k(0), a(0) { }
CMYKAValues(RGBA32 rgba, float cyan, float magenta, float yellow, float black, float alpha) : rgba(rgba), c(cyan), m(magenta), y(yellow), k(black), a(alpha) { }
RGBA32 rgba;
float c;
float m;
float y;
float k;
float a;
};
enum ConstructCurrentColorTag { ConstructCurrentColor };
CanvasStyle(ConstructCurrentColorTag) : m_type(CurrentColor) { }
CanvasStyle(Type type, float overrideAlpha)
: m_overrideAlpha(overrideAlpha)
, m_type(type)
{
}
union {
RGBA32 m_rgba;
float m_overrideAlpha;
CanvasGradient* m_gradient;
CanvasPattern* m_pattern;
CMYKAValues* m_cmyka;
};
Type m_type;
};
RGBA32 currentColor(HTMLCanvasElement*);
bool parseColorOrCurrentColor(RGBA32& parsedColor, const String& colorString, HTMLCanvasElement*);
inline CanvasStyle::CanvasStyle()
: m_type(Invalid)
{
}
inline CanvasGradient* CanvasStyle::canvasGradient() const
{
if (m_type == Gradient)
return m_gradient;
return 0;
}
inline CanvasPattern* CanvasStyle::canvasPattern() const
{
if (m_type == ImagePattern)
return m_pattern;
return 0;
}
inline String CanvasStyle::color() const
{
ASSERT(m_type == RGBA || m_type == CMYKA);
if (m_type == RGBA)
return Color(m_rgba).serialized();
return Color(m_cmyka->rgba).serialized();
}
inline CanvasStyle::CanvasStyle(CanvasStyle&& other)
{
memcpy(this, &other, sizeof(CanvasStyle));
other.m_type = Invalid;
}
inline CanvasStyle& CanvasStyle::operator=(CanvasStyle&& other)
{
if (this != &other) {
memcpy(this, &other, sizeof(CanvasStyle));
other.m_type = Invalid;
}
return *this;
}
} // namespace WebCore
#endif
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