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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