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/*
* Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Torch Mobile, Inc.
*
* 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 COMPUTER, 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 COMPUTER, 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 Gradient_h
#define Gradient_h
#include "AffineTransform.h"
#include "FloatPoint.h"
#include "Generator.h"
#include "GraphicsTypes.h"
#include <wtf/PassRefPtr.h>
#include <wtf/Vector.h>
#if USE(CG)
typedef struct CGContext* CGContextRef;
typedef struct CGGradient* CGGradientRef;
typedef CGGradientRef PlatformGradient;
#elif PLATFORM(QT)
QT_BEGIN_NAMESPACE
class QGradient;
QT_END_NAMESPACE
typedef QGradient* PlatformGradient;
#elif USE(CAIRO)
typedef struct _cairo_pattern cairo_pattern_t;
typedef cairo_pattern_t* PlatformGradient;
#elif USE(SKIA)
class SkShader;
typedef class SkShader* PlatformGradient;
typedef class SkShader* PlatformPattern;
#elif PLATFORM(WX)
class wxGraphicsBrush;
typedef wxGraphicsBrush* PlatformGradient;
#else
typedef void* PlatformGradient;
#endif
namespace WebCore {
class Color;
class Gradient : public Generator {
public:
static PassRefPtr<Gradient> create(const FloatPoint& p0, const FloatPoint& p1)
{
return adoptRef(new Gradient(p0, p1));
}
static PassRefPtr<Gradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio = 1)
{
return adoptRef(new Gradient(p0, r0, p1, r1, aspectRatio));
}
virtual ~Gradient();
struct ColorStop;
void addColorStop(const ColorStop&);
void addColorStop(float, const Color&);
void getColor(float value, float* r, float* g, float* b, float* a) const;
bool hasAlpha() const;
bool isRadial() const { return m_radial; }
bool isZeroSize() const { return m_p0.x() == m_p1.x() && m_p0.y() == m_p1.y() && (!m_radial || m_r0 == m_r1); }
const FloatPoint& p0() const { return m_p0; }
const FloatPoint& p1() const { return m_p1; }
void setP0(const FloatPoint& p)
{
if (m_p0 == p)
return;
m_p0 = p;
invalidateHash();
}
void setP1(const FloatPoint& p)
{
if (m_p1 == p)
return;
m_p1 = p;
invalidateHash();
}
float startRadius() const { return m_r0; }
float endRadius() const { return m_r1; }
void setStartRadius(float r)
{
if (m_r0 == r)
return;
m_r0 = r;
invalidateHash();
}
void setEndRadius(float r)
{
if (m_r1 == r)
return;
m_r1 = r;
invalidateHash();
}
float aspectRatio() const { return m_aspectRatio; }
#if OS(WINCE) && !PLATFORM(QT)
const Vector<ColorStop, 2>& getStops() const;
#else
PlatformGradient platformGradient();
#endif
struct ColorStop {
float stop;
float red;
float green;
float blue;
float alpha;
ColorStop() : stop(0), red(0), green(0), blue(0), alpha(0) { }
ColorStop(float s, float r, float g, float b, float a) : stop(s), red(r), green(g), blue(b), alpha(a) { }
};
void setStopsSorted(bool s) { m_stopsSorted = s; }
void setSpreadMethod(GradientSpreadMethod);
GradientSpreadMethod spreadMethod() { return m_spreadMethod; }
void setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation);
// Qt and CG transform the gradient at draw time
AffineTransform gradientSpaceTransform() { return m_gradientSpaceTransformation; }
virtual void fill(GraphicsContext*, const FloatRect&);
virtual void adjustParametersForTiledDrawing(IntSize& size, FloatRect& srcRect);
void setPlatformGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation);
virtual unsigned hash() const OVERRIDE;
void invalidateHash() { m_cachedHash = 0; }
#if USE(CG)
void paint(CGContextRef);
void paint(GraphicsContext*);
#elif USE(CAIRO)
PlatformGradient platformGradient(float globalAlpha);
#endif
private:
Gradient(const FloatPoint& p0, const FloatPoint& p1);
Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio);
void platformInit() { m_gradient = 0; }
void platformDestroy();
int findStop(float value) const;
void sortStopsIfNecessary();
// Keep any parameters relevant to rendering in sync with the structure in Gradient::hash().
bool m_radial;
FloatPoint m_p0;
FloatPoint m_p1;
float m_r0;
float m_r1;
float m_aspectRatio; // For elliptical gradient, width / height.
mutable Vector<ColorStop, 2> m_stops;
mutable bool m_stopsSorted;
mutable int m_lastStop;
GradientSpreadMethod m_spreadMethod;
AffineTransform m_gradientSpaceTransformation;
mutable unsigned m_cachedHash;
PlatformGradient m_gradient;
#if USE(CAIRO)
float m_platformGradientAlpha;
#endif
};
} //namespace
#endif
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