1 /*
2 * Copyright 2012 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 namespace skiagm {
12
MakeLinear(SkScalar width,SkScalar height,bool alternate,const SkMatrix & localMatrix)13 static sk_sp<SkShader> MakeLinear(SkScalar width, SkScalar height, bool alternate,
14 const SkMatrix& localMatrix) {
15 SkPoint pts[2] = { {0, 0}, {width, height}};
16 SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
17 if (alternate) {
18 pts[1].fY = 0;
19 colors[0] = SK_ColorBLUE;
20 colors[1] = SK_ColorYELLOW;
21 }
22 return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode,
23 0, &localMatrix);
24 }
25
26 ///////////////////////////////////////////////////////////////////////////////
27
28 class ShaderBoundsGM : public GM {
29 public:
30 typedef sk_sp<SkShader> (*ShaderGenFunc)(SkScalar width, SkScalar height,
31 bool alternate, const SkMatrix& localMatrix);
ShaderBoundsGM(ShaderGenFunc maker,const SkString & name)32 ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
33 : fShaderMaker(maker),
34 fName(name) {
35 }
36
37 protected:
38
onShortName()39 SkString onShortName() override {
40 return fName;
41 }
42
onISize()43 SkISize onISize() override { return SkISize::Make(320, 240); }
44
onGetInitialTransform() const45 SkMatrix onGetInitialTransform() const override {
46 SkMatrix result;
47 SkScalar scale = 0.8f;
48 result.setScale(scale, scale);
49 result.postTranslate(SkIntToScalar(7), SkIntToScalar(23));
50 return result;
51 }
52
onDraw(SkCanvas * canvas)53 void onDraw(SkCanvas* canvas) override {
54 // The PDF device has already clipped to the content area, but we
55 // do it again here so that the raster and pdf results are consistent.
56 canvas->clipRect(SkRect::MakeWH(SkIntToScalar(320),
57 SkIntToScalar(240)));
58
59 SkMatrix canvasScale;
60 SkScalar scale = 0.7f;
61 canvasScale.setScale(scale, scale);
62 canvas->concat(canvasScale);
63
64 // Background shader.
65 SkPaint paint;
66 paint.setShader(MakeShader(559, 387, false));
67 SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41),
68 SkIntToScalar(571), SkIntToScalar(428));
69 canvas->drawRect(r, paint);
70
71 // Constrained shader.
72 paint.setShader(MakeShader(101, 151, true));
73 r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71),
74 SkIntToScalar(101), SkIntToScalar(151));
75 canvas->clipRect(r);
76 canvas->drawRect(r, paint);
77 }
78
MakeShader(int width,int height,bool background)79 sk_sp<SkShader> MakeShader(int width, int height, bool background) {
80 SkScalar scale = 0.5f;
81 if (background) {
82 scale = 0.6f;
83 }
84 SkScalar shaderWidth = width / scale;
85 SkScalar shaderHeight = height / scale;
86 SkMatrix shaderScale = SkMatrix::MakeScale(scale);
87 return fShaderMaker(shaderWidth, shaderHeight, background, shaderScale);
88 }
89
90 private:
91 typedef GM INHERITED;
92
93 ShaderGenFunc fShaderMaker;
94 SkString fName;
95
96 sk_sp<SkShader> MakeShader(bool background);
97 };
98
99 ///////////////////////////////////////////////////////////////////////////////
100
MyFactory(void *)101 static GM* MyFactory(void*) {
102 return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear"));
103 }
104 static GMRegistry reg(MyFactory);
105
106 }
107