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 SkShader* (*MakeShaderProc)(const SkColor[], int count, const SkSize&);
12
shader_linear(const SkColor colors[],int count,const SkSize & size)13 static SkShader* shader_linear(const SkColor colors[], int count, const SkSize& size) {
14 SkPoint pts[] = { { 0, 0 }, { size.width(), size.height() } };
15 return SkGradientShader::CreateLinear(pts, colors, nullptr, count,
16 SkShader::kClamp_TileMode);
17 }
18
shader_radial(const SkColor colors[],int count,const SkSize & size)19 static SkShader* shader_radial(const SkColor colors[], int count, const SkSize& size) {
20 SkPoint center = { size.width()/2, size.height()/2 };
21 return SkGradientShader::CreateRadial(center, size.width()/2, colors, nullptr, count,
22 SkShader::kClamp_TileMode);
23 }
24
shader_conical(const SkColor colors[],int count,const SkSize & size)25 static SkShader* shader_conical(const SkColor colors[], int count, const SkSize& size) {
26 SkPoint center = { size.width()/2, size.height()/2 };
27 return SkGradientShader::CreateTwoPointConical(center, size.width()/64,
28 center, size.width()/2,
29 colors, nullptr, count,
30 SkShader::kClamp_TileMode);
31 }
32
shader_sweep(const SkColor colors[],int count,const SkSize & size)33 static SkShader* shader_sweep(const SkColor colors[], int count, const SkSize& size) {
34 return SkGradientShader::CreateSweep(size.width()/2, size.height()/2,
35 colors, nullptr, count);
36 }
37
38 class ShallowGradientGM : public skiagm::GM {
39 public:
ShallowGradientGM(MakeShaderProc proc,const char name[],bool dither)40 ShallowGradientGM(MakeShaderProc proc, const char name[], bool dither)
41 : fProc(proc)
42 , fDither(dither) {
43 fName.printf("shallow_gradient_%s", name);
44 }
45
46 protected:
47
onShortName()48 SkString onShortName() override {
49 return fName;
50 }
51
onISize()52 SkISize onISize() override {
53 return SkISize::Make(800, 800);
54 }
55
onDraw(SkCanvas * canvas)56 void onDraw(SkCanvas* canvas) override {
57 const SkColor colors[] = { sk_tool_utils::color_to_565(0xFF555555),
58 sk_tool_utils::color_to_565(0xFF444444) };
59 const int colorCount = SK_ARRAY_COUNT(colors);
60
61 SkRect r = { 0, 0, this->width(), this->height() };
62 SkSize size = SkSize::Make(r.width(), r.height());
63
64 SkPaint paint;
65 paint.setShader(fProc(colors, colorCount, size))->unref();
66 paint.setDither(fDither);
67 canvas->drawRect(r, paint);
68 }
69
70 private:
71 MakeShaderProc fProc;
72 SkString fName;
73 bool fDither;
74
75 typedef skiagm::GM INHERITED;
76 };
77
78 ///////////////////////////////////////////////////////////////////////////////
79
80 DEF_GM( return new ShallowGradientGM(shader_linear, "linear", true); )
81 DEF_GM( return new ShallowGradientGM(shader_radial, "radial", true); )
82 DEF_GM( return new ShallowGradientGM(shader_conical, "conical", true); )
83 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep", true); )
84
85 DEF_GM( return new ShallowGradientGM(shader_linear, "linear_nodither", false); )
86 DEF_GM( return new ShallowGradientGM(shader_radial, "radial_nodither", false); )
87 DEF_GM( return new ShallowGradientGM(shader_conical, "conical_nodither", false); )
88 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep_nodither", false); )
89