1/*
2 * Copyright 2007 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkColorShader_DEFINED
9#define SkColorShader_DEFINED
10
11#include "src/shaders/SkShaderBase.h"
12
13/** \class SkColorShader
14 A Shader that represents a single color. In general, this effect can be
15 accomplished by just using the color field on the paint, but if an
16 actual shader object is needed, this provides that feature.
17*/
18class SkColorShader : public SkShaderBase {
19public:
20 /** Create a ColorShader that ignores the color in the paint, and uses the
21 specified color. Note: like all shaders, at draw time the paint's alpha
22 will be respected, and is applied to the specified color.
23 */
24 explicit SkColorShader(SkColor c);
25
26 bool isOpaque() const override;
27 bool isConstant() const override { return true; }
28
29 GradientType asAGradient(GradientInfo* info) const override;
30
31#if SK_SUPPORT_GPU
32 std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
33#endif
34
35private:
36 SK_FLATTENABLE_HOOKS(SkColorShader)
37
38 void flatten(SkWriteBuffer&) const override;
39
40 bool onAsLuminanceColor(SkColor* lum) const override {
41 *lum = fColor;
42 return true;
43 }
44
45 bool onAppendStages(const SkStageRec&) const override;
46
47 skvm::Color onProgram(skvm::Builder*, skvm::F32 x, skvm::F32 y, skvm::Color paint,
48 const SkMatrix& ctm, const SkMatrix* localM,
49 SkFilterQuality quality, const SkColorInfo& dst,
50 skvm::Uniforms* uniforms, SkArenaAlloc*) const override;
51
52 SkColor fColor;
53};
54
55class SkColor4Shader : public SkShaderBase {
56public:
57 SkColor4Shader(const SkColor4f&, sk_sp<SkColorSpace>);
58
59 bool isOpaque() const override { return fColor.isOpaque(); }
60 bool isConstant() const override { return true; }
61
62#if SK_SUPPORT_GPU
63 std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
64#endif
65
66private:
67 SK_FLATTENABLE_HOOKS(SkColor4Shader)
68
69 void flatten(SkWriteBuffer&) const override;
70 bool onAppendStages(const SkStageRec&) const override;
71
72 skvm::Color onProgram(skvm::Builder*, skvm::F32 x, skvm::F32 y, skvm::Color paint,
73 const SkMatrix& ctm, const SkMatrix* localM,
74 SkFilterQuality quality, const SkColorInfo& dst,
75 skvm::Uniforms* uniforms, SkArenaAlloc*) const override;
76
77 sk_sp<SkColorSpace> fColorSpace;
78 const SkColor4f fColor;
79};
80
81#endif
82