1 2 /* 3 * Copyright 2012 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #include "gm.h" 10 11 #include "SkCanvas.h" 12 #include "SkComposeShader.h" 13 #include "SkGradientShader.h" 14 #include "SkGraphics.h" 15 #include "SkShader.h" 16 #include "SkString.h" 17 #include "SkXfermode.h" 18 19 namespace skiagm { 20 21 class ShaderGM : public GM { 22 public: 23 ShaderGM() { 24 SkPoint pts[2]; 25 SkColor colors[2]; 26 27 pts[0].set(0, 0); 28 pts[1].set(SkIntToScalar(100), 0); 29 colors[0] = SK_ColorRED; 30 colors[1] = SK_ColorBLUE; 31 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, 32 SkShader::kClamp_TileMode); 33 34 pts[0].set(0, 0); 35 pts[1].set(0, SkIntToScalar(100)); 36 colors[0] = SK_ColorBLACK; 37 colors[1] = SkColorSetARGB(0x80, 0, 0, 0); 38 SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, 39 SkShader::kClamp_TileMode); 40 41 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode); 42 43 fShader = new SkComposeShader(shaderA, shaderB, mode); 44 shaderA->unref(); 45 shaderB->unref(); 46 mode->unref(); 47 } 48 49 virtual ~ShaderGM() { 50 SkSafeUnref(fShader); 51 } 52 53 protected: 54 virtual SkString onShortName() SK_OVERRIDE { 55 return SkString("composeshader"); 56 } 57 58 virtual SkISize onISize() SK_OVERRIDE { 59 return make_isize(640, 480); 60 } 61 62 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { 63 64 SkPaint paint; 65 66 paint.setColor(SK_ColorGREEN); 67 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint); 68 paint.setShader(fShader); 69 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint); 70 } 71 72 private: 73 SkShader* fShader; 74 typedef GM INHERITED ; 75 }; 76 77 ////////////////////////////////////////////////////////////////////////////// 78 79 static GM* MyFactory(void*) { return new ShaderGM; } 80 static GMRegistry reg(MyFactory); 81 82 } // namespace 83
