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 #include "gm.h" 8 #include "SkGradientShader.h" 9 10 using namespace skiagm; 11 12 struct GradData { 13 int fCount; 14 const SkColor* fColors; 15 const SkScalar* fPos; 16 }; 17 18 constexpr SkColor gColors[] = { 19 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 20 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 21 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 22 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 23 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 24 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 25 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 26 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 27 }; 28 29 //constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 }; 30 31 constexpr GradData gGradData[] = { 32 { 40, gColors, nullptr }, 33 // { 2, gColors, gPos }, 34 // { 2, gCol2, nullptr }, 35 }; 36 MakeLinear(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)37 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) { 38 return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm); 39 } 40 MakeRadial(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)41 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) { 42 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) }; 43 return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm); 44 } 45 MakeSweep(const SkPoint pts[2],const GradData & data,SkShader::TileMode)46 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) { 47 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) }; 48 return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount); 49 } 50 51 52 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode); 53 54 constexpr GradMaker gGradMakers[] = { 55 MakeLinear, MakeRadial, MakeSweep, 56 }; 57 58 /////////////////////////////////////////////////////////////////////////////// 59 60 class GradientsGM : public GM { 61 public: GradientsGM()62 GradientsGM() { 63 this->setBGColor(0xFFDDDDDD); 64 } 65 66 protected: onShortName()67 SkString onShortName() override { return SkString("gradient_dirty_laundry"); } onISize()68 SkISize onISize() override { return SkISize::Make(640, 615); } 69 onDraw(SkCanvas * canvas)70 void onDraw(SkCanvas* canvas) override { 71 SkPoint pts[2] = { { 0, 0 }, 72 { SkIntToScalar(100), SkIntToScalar(100) } 73 }; 74 SkShader::TileMode tm = SkShader::kClamp_TileMode; 75 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; 76 SkPaint paint; 77 paint.setAntiAlias(true); 78 79 canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); 80 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { 81 canvas->save(); 82 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) { 83 paint.setShader(gGradMakers[j](pts, gGradData[i], tm)); 84 canvas->drawRect(r, paint); 85 canvas->translate(0, SkIntToScalar(120)); 86 } 87 canvas->restore(); 88 canvas->translate(SkIntToScalar(120), 0); 89 } 90 } 91 92 private: 93 typedef GM INHERITED; 94 }; 95 96 /////////////////////////////////////////////////////////////////////////////// 97 98 DEF_GM( return new GradientsGM; ) 99