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