1 #include "gm.h"
2 #include "SkGradientShader.h"
3
4 namespace skiagm {
5
6 struct GradData {
7 int fCount;
8 const SkColor* fColors;
9 const SkScalar* fPos;
10 };
11
12 static const SkColor gColors[] = {
13 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
14 };
15 static const SkScalar gPos0[] = { 0, SK_Scalar1 };
16 static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
17 static const SkScalar gPos2[] = {
18 0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
19 };
20
21 static const GradData gGradData[] = {
22 { 2, gColors, NULL },
23 { 2, gColors, gPos0 },
24 { 2, gColors, gPos1 },
25 { 5, gColors, NULL },
26 { 5, gColors, gPos2 }
27 };
28
MakeLinear(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm,SkUnitMapper * mapper)29 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
30 SkShader::TileMode tm, SkUnitMapper* mapper) {
31 return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
32 data.fCount, tm, mapper);
33 }
34
MakeRadial(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm,SkUnitMapper * mapper)35 static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
36 SkShader::TileMode tm, SkUnitMapper* mapper) {
37 SkPoint center;
38 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
39 SkScalarAve(pts[0].fY, pts[1].fY));
40 return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
41 data.fPos, data.fCount, tm, mapper);
42 }
43
MakeSweep(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm,SkUnitMapper * mapper)44 static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
45 SkShader::TileMode tm, SkUnitMapper* mapper) {
46 SkPoint center;
47 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
48 SkScalarAve(pts[0].fY, pts[1].fY));
49 return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
50 data.fPos, data.fCount, mapper);
51 }
52
53 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
54 SkShader::TileMode tm, SkUnitMapper* mapper);
55 static const GradMaker gGradMakers[] = {
56 MakeLinear, MakeRadial, MakeSweep
57 };
58
59 ///////////////////////////////////////////////////////////////////////////////
60
61 class GradientsGM : public GM {
62 public:
GradientsGM()63 GradientsGM() {}
64
65 protected:
onShortName()66 SkString onShortName() {
67 return SkString("gradients");
68 }
69
onISize()70 SkISize onISize() { return make_isize(640, 380); }
71
drawBG(SkCanvas * canvas)72 void drawBG(SkCanvas* canvas) {
73 canvas->drawColor(0xFFDDDDDD);
74 }
75
onDraw(SkCanvas * canvas)76 virtual void onDraw(SkCanvas* canvas) {
77 this->drawBG(canvas);
78
79 SkPoint pts[2] = {
80 { 0, 0 },
81 { SkIntToScalar(100), SkIntToScalar(100) }
82 };
83 SkShader::TileMode tm = SkShader::kClamp_TileMode;
84 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
85 SkPaint paint;
86 paint.setAntiAlias(true);
87
88 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
89 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
90 canvas->save();
91 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
92 SkShader* shader = gGradMakers[j](pts, gGradData[i], tm, NULL);
93 paint.setShader(shader);
94 canvas->drawRect(r, paint);
95 shader->unref();
96 canvas->translate(0, SkIntToScalar(120));
97 }
98 canvas->restore();
99 canvas->translate(SkIntToScalar(120), 0);
100 }
101 }
102
103 private:
104 typedef GM INHERITED;
105 };
106
107 ///////////////////////////////////////////////////////////////////////////////
108
MyFactory(void *)109 static GM* MyFactory(void*) { return new GradientsGM; }
110 static GMRegistry reg(MyFactory);
111
112 }
113
114