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 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 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 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: 63 GradientsGM() {} 64 65 protected: 66 SkString onShortName() { 67 return SkString("gradients"); 68 } 69 70 SkISize onISize() { return make_isize(640, 380); } 71 72 void drawBG(SkCanvas* canvas) { 73 canvas->drawColor(0xFFDDDDDD); 74 } 75 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 /////////////////////////////////////////////////////////////////////////////// 108 109 static GM* MyFactory(void*) { return new GradientsGM; } 110 static GMRegistry reg(MyFactory); 111 112 } 113 114