1 /* 2 * Copyright 2011 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 8 #include "DecodeFile.h" 9 #include "SampleCode.h" 10 #include "SkView.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkGraphics.h" 14 #include "SkPath.h" 15 #include "SkRegion.h" 16 #include "SkShader.h" 17 #include "SkUtils.h" 18 #include "SkColorPriv.h" 19 #include "SkColorFilter.h" 20 #include "SkTime.h" 21 #include "SkTypeface.h" 22 23 static sk_sp<SkShader> make_bitmapfade(const SkBitmap& bm) { 24 SkPoint pts[2]; 25 SkColor colors[2]; 26 27 pts[0].set(0, 0); 28 pts[1].set(0, SkIntToScalar(bm.height())); 29 colors[0] = SK_ColorBLACK; 30 colors[1] = SkColorSetARGB(0, 0, 0, 0); 31 auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); 32 33 auto shaderB = SkShader::MakeBitmapShader(bm, 34 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 35 36 return SkShader::MakeComposeShader(std::move(shaderB), std::move(shaderA), SkBlendMode::kDstIn); 37 } 38 39 class ShaderView : public SampleView { 40 public: 41 sk_sp<SkShader> fShader; 42 SkBitmap fBitmap; 43 44 ShaderView() { 45 decode_file("/skimages/logo.gif", &fBitmap); 46 47 SkPoint pts[2]; 48 SkColor colors[2]; 49 50 pts[0].set(0, 0); 51 pts[1].set(SkIntToScalar(100), 0); 52 colors[0] = SK_ColorRED; 53 colors[1] = SK_ColorBLUE; 54 auto shaderA = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); 55 56 pts[0].set(0, 0); 57 pts[1].set(0, SkIntToScalar(100)); 58 colors[0] = SK_ColorBLACK; 59 colors[1] = SkColorSetARGB(0x80, 0, 0, 0); 60 auto shaderB = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); 61 62 fShader = SkShader::MakeComposeShader(std::move(shaderA), std::move(shaderB), 63 SkBlendMode::kDstIn); 64 } 65 66 protected: 67 // overrides from SkEventSink 68 bool onQuery(SkEvent* evt) override { 69 if (SampleCode::TitleQ(*evt)) { 70 SampleCode::TitleR(evt, "Shaders"); 71 return true; 72 } 73 return this->INHERITED::onQuery(evt); 74 } 75 76 void onDrawContent(SkCanvas* canvas) override { 77 canvas->drawBitmap(fBitmap, 0, 0); 78 79 canvas->translate(20, 120); 80 81 SkPaint paint; 82 SkRect r; 83 84 paint.setColor(SK_ColorGREEN); 85 canvas->drawRect(SkRect::MakeWH(100, 100), paint); 86 paint.setShader(fShader); 87 canvas->drawRect(SkRect::MakeWH(100, 100), paint); 88 89 canvas->translate(SkIntToScalar(110), 0); 90 91 int w = fBitmap.width(); 92 int h = fBitmap.height(); 93 w = 120; 94 h = 80; 95 r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h)); 96 97 paint.setShader(nullptr); 98 canvas->drawRect(r, paint); 99 paint.setShader(make_bitmapfade(fBitmap)); 100 canvas->drawRect(r, paint); 101 } 102 103 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override { 104 this->inval(nullptr); 105 return this->INHERITED::onFindClickHandler(x, y, modi); 106 } 107 108 bool onClick(Click* click) override { 109 return this->INHERITED::onClick(click); 110 } 111 112 private: 113 typedef SampleView INHERITED; 114 }; 115 116 ////////////////////////////////////////////////////////////////////////////// 117 118 static SkView* MyFactory() { return new ShaderView; } 119 static SkViewRegister reg(MyFactory); 120
