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 #include "gm.h"
8 #include "SkGradientShader.h"
9
10 namespace skiagm {
11
MakeLinear(SkScalar width,SkScalar height,bool alternate)12 static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate) {
13 SkPoint pts[2] = { {0, 0}, {width, height}};
14 SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
15 if (alternate) {
16 pts[1].fY = 0;
17 colors[0] = SK_ColorBLUE;
18 colors[1] = SK_ColorYELLOW;
19 }
20 return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
21 SkShader::kClamp_TileMode, NULL);
22 }
23
24 ///////////////////////////////////////////////////////////////////////////////
25
26 class ShaderBoundsGM : public GM {
27 public:
28 typedef SkShader* (*ShaderGenFunc)(SkScalar width, SkScalar height,
29 bool alternate);
ShaderBoundsGM(ShaderGenFunc maker,const SkString & name)30 ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
31 : fShaderMaker(maker),
32 fName(name) {
33 }
34
35 protected:
onShortName()36 SkString onShortName() {
37 return fName;
38 }
39
onISize()40 virtual SkISize onISize() { return make_isize(320, 240); }
41
onGetInitialTransform() const42 virtual SkMatrix onGetInitialTransform() const SK_OVERRIDE {
43 SkMatrix result;
44 SkScalar scale = 0.8f;
45 result.setScale(scale, scale);
46 result.postTranslate(SkIntToScalar(7), SkIntToScalar(23));
47 return result;
48 }
49
onDraw(SkCanvas * canvas)50 virtual void onDraw(SkCanvas* canvas) {
51 // The PDF device has already clipped to the content area, but we
52 // do it again here so that the raster and pdf results are consistent.
53 canvas->clipRect(SkRect::MakeWH(SkIntToScalar(320),
54 SkIntToScalar(240)));
55
56 SkMatrix canvasScale;
57 SkScalar scale = 0.7f;
58 canvasScale.setScale(scale, scale);
59 canvas->concat(canvasScale);
60
61 // Background shader.
62 SkPaint paint;
63 paint.setShader(MakeShader(559, 387, false))->unref();
64 SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41),
65 SkIntToScalar(571), SkIntToScalar(428));
66 canvas->drawRect(r, paint);
67
68 // Constrained shader.
69 paint.setShader(MakeShader(101, 151, true))->unref();
70 r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71),
71 SkIntToScalar(101), SkIntToScalar(151));
72 canvas->clipRect(r);
73 canvas->drawRect(r, paint);
74 }
75
MakeShader(int width,int height,bool background)76 SkShader* MakeShader(int width, int height, bool background) {
77 SkScalar scale = 0.5f;
78 if (background) {
79 scale = 0.6f;
80 }
81 SkScalar shaderWidth = SkScalarDiv(SkIntToScalar(width), scale);
82 SkScalar shaderHeight = SkScalarDiv(SkIntToScalar(height), scale);
83 SkShader* shader = fShaderMaker(shaderWidth, shaderHeight, background);
84 SkMatrix shaderScale;
85 shaderScale.setScale(scale, scale);
86 shader->setLocalMatrix(shaderScale);
87 return shader;
88 }
89
90 private:
91 typedef GM INHERITED;
92
93 ShaderGenFunc fShaderMaker;
94 SkString fName;
95
96 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