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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.
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* 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 "core/platform/graphics/FloatPoint.h"
#include "core/platform/graphics/GraphicsTypes.h"
#include "core/platform/graphics/transforms/AffineTransform.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
class SkShader;
namespace WebCore {
class Color;
class FloatRect;
class IntSize;
class Gradient : public RefCounted<Gradient> {
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));
}
~Gradient();
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 addColorStop(const ColorStop&);
void addColorStop(float, const Color&);
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; }
SkShader* shader();
void setStopsSorted(bool s) { m_stopsSorted = s; }
void setDrawsInPMColorSpace(bool drawInPMColorSpace);
void setSpreadMethod(GradientSpreadMethod);
GradientSpreadMethod spreadMethod() { return m_spreadMethod; }
void setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation);
AffineTransform gradientSpaceTransform() { return m_gradientSpaceTransformation; }
void adjustParametersForTiledDrawing(IntSize&, FloatRect&);
unsigned hash() const;
void invalidateHash() { m_cachedHash = 0; }
private:
Gradient(const FloatPoint& p0, const FloatPoint& p1);
Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio);
void destroyShader();
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;
GradientSpreadMethod m_spreadMethod;
AffineTransform m_gradientSpaceTransformation;
bool m_drawInPMColorSpace;
mutable unsigned m_cachedHash;
RefPtr<SkShader> m_gradient;
};
} // namespace WebCore
#endif
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