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 "sk_tool_utils.h" 9 #include "SkGradientShader.h" 10 11 using namespace skiagm; 12 13 struct GradData { 14 int fCount; 15 const SkColor* fColors; 16 const SkScalar* fPos; 17 }; 18 19 constexpr SkColor gColors[] = { 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 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK, 28 }; 29 30 //constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 }; 31 32 constexpr GradData gGradData[] = { 33 { 40, gColors, nullptr }, 34 // { 2, gColors, gPos }, 35 // { 2, gCol2, nullptr }, 36 }; 37 38 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) { 39 return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm); 40 } 41 42 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) { 43 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) }; 44 return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm); 45 } 46 47 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) { 48 const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) }; 49 return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount); 50 } 51 52 53 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode); 54 55 constexpr GradMaker gGradMakers[] = { 56 MakeLinear, MakeRadial, MakeSweep, 57 }; 58 59 /////////////////////////////////////////////////////////////////////////////// 60 61 class GradientsGM : public GM { 62 public: 63 GradientsGM() { 64 this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD)); 65 } 66 67 protected: 68 SkString onShortName() override { return SkString("gradient_dirty_laundry"); } 69 SkISize onISize() override { return SkISize::Make(640, 615); } 70 71 void onDraw(SkCanvas* canvas) override { 72 SkPoint pts[2] = { { 0, 0 }, 73 { SkIntToScalar(100), SkIntToScalar(100) } 74 }; 75 SkShader::TileMode tm = SkShader::kClamp_TileMode; 76 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; 77 SkPaint paint; 78 paint.setAntiAlias(true); 79 80 canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); 81 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) { 82 canvas->save(); 83 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) { 84 paint.setShader(gGradMakers[j](pts, gGradData[i], tm)); 85 canvas->drawRect(r, paint); 86 canvas->translate(0, SkIntToScalar(120)); 87 } 88 canvas->restore(); 89 canvas->translate(SkIntToScalar(120), 0); 90 } 91 } 92 93 private: 94 typedef GM INHERITED; 95 }; 96 97 /////////////////////////////////////////////////////////////////////////////// 98 99 static GM* MyFactory(void*) { return new GradientsGM; } 100 static GMRegistry reg(MyFactory); 101