1 /*
2 * Copyright 2013 Google Inc.
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 #include "gm.h"
9 #include "SkGradientShader.h"
10
11 typedef sk_sp<SkShader> (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
12
shader_linear(const SkColor colors[],int count,const SkSize & size)13 static sk_sp<SkShader> shader_linear(const SkColor colors[], int count, const SkSize& size) {
14 SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
15 return SkGradientShader::MakeLinear(pts, colors, nullptr, count, SkShader::kClamp_TileMode);
16 }
17
shader_radial(const SkColor colors[],int count,const SkSize & size)18 static sk_sp<SkShader> shader_radial(const SkColor colors[], int count, const SkSize& size) {
19 SkPoint center = { size.width()/2, size.height()/2 };
20 return SkGradientShader::MakeRadial(center, size.width()/2, colors, nullptr, count,
21 SkShader::kClamp_TileMode);
22 }
23
shader_conical(const SkColor colors[],int count,const SkSize & size)24 static sk_sp<SkShader> shader_conical(const SkColor colors[], int count, const SkSize& size) {
25 SkPoint center = { size.width()/2, size.height()/2 };
26 return SkGradientShader::MakeTwoPointConical(center, size.width()/64, center, size.width()/2,
27 colors, nullptr, count, SkShader::kClamp_TileMode);
28 }
29
shader_sweep(const SkColor colors[],int count,const SkSize & size)30 static sk_sp<SkShader> shader_sweep(const SkColor colors[], int count, const SkSize& size) {
31 return SkGradientShader::MakeSweep(size.width()/2, size.height()/2, colors, nullptr, count);
32 }
33
34 class ShallowGradientGM : public skiagm::GM {
35 public:
ShallowGradientGM(MakeShaderProc proc,const char name[],bool dither)36 ShallowGradientGM(MakeShaderProc proc, const char name[], bool dither)
37 : fProc(proc)
38 , fDither(dither) {
39 fName.printf("shallow_gradient_%s", name);
40 }
41
42 protected:
43
onShortName()44 SkString onShortName() override {
45 return fName;
46 }
47
onISize()48 SkISize onISize() override {
49 return SkISize::Make(800, 800);
50 }
51
onDraw(SkCanvas * canvas)52 void onDraw(SkCanvas* canvas) override {
53 const SkColor colors[] = { 0xFF555555, 0xFF444444 };
54 const int colorCount = SK_ARRAY_COUNT(colors);
55
56 SkRect r = { 0, 0, this->width(), this->height() };
57 SkSize size = SkSize::Make(r.width(), r.height());
58
59 SkPaint paint;
60 paint.setShader(fProc(colors, colorCount, size));
61 paint.setDither(fDither);
62 canvas->drawRect(r, paint);
63 }
64
65 private:
66 MakeShaderProc fProc;
67 SkString fName;
68 bool fDither;
69
70 typedef skiagm::GM INHERITED;
71 };
72
73 ///////////////////////////////////////////////////////////////////////////////
74
75 DEF_GM( return new ShallowGradientGM(shader_linear, "linear", true); )
76 DEF_GM( return new ShallowGradientGM(shader_radial, "radial", true); )
77 DEF_GM( return new ShallowGradientGM(shader_conical, "conical", true); )
78 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep", true); )
79
80 DEF_GM( return new ShallowGradientGM(shader_linear, "linear_nodither", false); )
81 DEF_GM( return new ShallowGradientGM(shader_radial, "radial_nodither", false); )
82 DEF_GM( return new ShallowGradientGM(shader_conical, "conical_nodither", false); )
83 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep_nodither", false); )
84