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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkSGGradient_DEFINED
#define SkSGGradient_DEFINED
#include "SkSGPaintNode.h"
#include "SkColor.h"
#include "SkPoint.h"
#include "SkScalar.h"
#include "SkShader.h"
#include <vector>
namespace sksg {
/**
* Gradient base class.
*/
class Gradient : public PaintNode {
public:
struct ColorStop {
SkScalar fPosition;
SkColor fColor;
bool operator==(const ColorStop& other) const {
return fPosition == other.fPosition && fColor == other.fColor;
}
};
SG_ATTRIBUTE(ColorStops, std::vector<ColorStop>, fColorStops)
SG_ATTRIBUTE(TileMode , SkShader::TileMode , fTileMode )
protected:
void onApplyToPaint(SkPaint*) const final;
virtual sk_sp<SkShader> onMakeShader(const std::vector<SkColor>& colors,
const std::vector<SkScalar>& positions) const = 0;
protected:
Gradient() = default;
private:
std::vector<ColorStop> fColorStops;
SkShader::TileMode fTileMode = SkShader::kClamp_TileMode;
using INHERITED = PaintNode;
};
class LinearGradient final : public Gradient {
public:
static sk_sp<LinearGradient> Make() {
return sk_sp<LinearGradient>(new LinearGradient());
}
SG_ATTRIBUTE(StartPoint, SkPoint, fStartPoint)
SG_ATTRIBUTE(EndPoint , SkPoint, fEndPoint )
protected:
sk_sp<SkShader> onMakeShader(const std::vector<SkColor>& colors,
const std::vector<SkScalar>& positions) const override;
private:
LinearGradient() = default;
SkPoint fStartPoint = SkPoint::Make(0, 0),
fEndPoint = SkPoint::Make(0, 0);
using INHERITED = Gradient;
};
class RadialGradient final : public Gradient {
public:
static sk_sp<RadialGradient> Make() {
return sk_sp<RadialGradient>(new RadialGradient());
}
SG_ATTRIBUTE(StartCenter, SkPoint , fStartCenter)
SG_ATTRIBUTE(EndCenter , SkPoint , fEndCenter )
SG_ATTRIBUTE(StartRadius, SkScalar, fStartRadius)
SG_ATTRIBUTE(EndRadius , SkScalar, fEndRadius )
protected:
sk_sp<SkShader> onMakeShader(const std::vector<SkColor>& colors,
const std::vector<SkScalar>& positions) const override;
private:
RadialGradient() = default;
SkPoint fStartCenter = SkPoint::Make(0, 0),
fEndCenter = SkPoint::Make(0, 0);
SkScalar fStartRadius = 0,
fEndRadius = 0;
using INHERITED = Gradient;
};
} // namespace sksg
#endif // SkSGGradient_DEFINED
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