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, NULL, 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, NULL, 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, NULL, 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, NULL, count);
36 }
37
38 class ShallowGradientGM : public skiagm::GM {
39 public:
ShallowGradientGM(MakeShaderProc proc,const char name[])40 ShallowGradientGM(MakeShaderProc proc, const char name[]) : fProc(proc) {
41 fName.printf("shallow_gradient_%s", name);
42 }
43
44 protected:
45
onShortName()46 SkString onShortName() override {
47 return fName;
48 }
49
onISize()50 SkISize onISize() override {
51 return SkISize::Make(800, 800);
52 }
53
onDraw(SkCanvas * canvas)54 void onDraw(SkCanvas* canvas) override {
55 const SkColor colors[] = { 0xFF555555, 0xFF444444 };
56 const int colorCount = SK_ARRAY_COUNT(colors);
57
58 SkRect r = { 0, 0, this->width(), this->height() };
59 SkSize size = SkSize::Make(r.width(), r.height());
60
61 SkPaint paint;
62 paint.setShader(fProc(colors, colorCount, size))->unref();
63 canvas->drawRect(r, paint);
64 }
65
66 private:
67 MakeShaderProc fProc;
68 SkString fName;
69
70 typedef skiagm::GM INHERITED;
71 };
72
73 ///////////////////////////////////////////////////////////////////////////////
74
75 DEF_GM( return new ShallowGradientGM(shader_linear, "linear"); )
76 DEF_GM( return new ShallowGradientGM(shader_radial, "radial"); )
77 DEF_GM( return new ShallowGradientGM(shader_conical, "conical"); )
78 DEF_GM( return new ShallowGradientGM(shader_sweep, "sweep"); )
79