1 2/* 3 * Copyright 2011 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#include "SampleCode.h" 9#include "SkView.h" 10#include "SkCanvas.h" 11#include "SkGradientShader.h" 12#include "SkGraphics.h" 13#include "SkImageDecoder.h" 14#include "SkPath.h" 15#include "SkRegion.h" 16#include "SkShader.h" 17#include "SkUtils.h" 18#include "SkXfermode.h" 19#include "SkComposeShader.h" 20#include "SkColorPriv.h" 21#include "SkColorFilter.h" 22#include "SkTime.h" 23#include "SkTransparentShader.h" 24#include "SkTypeface.h" 25 26static SkShader* make_bitmapfade(const SkBitmap& bm) 27{ 28 SkPoint pts[2]; 29 SkColor colors[2]; 30 31 pts[0].set(0, 0); 32 pts[1].set(0, SkIntToScalar(bm.height())); 33 colors[0] = SK_ColorBLACK; 34 colors[1] = SkColorSetARGB(0, 0, 0, 0); 35 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode); 36 37 SkShader* shaderB = SkShader::CreateBitmapShader(bm, 38 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 39 40 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode); 41 42 SkShader* shader = new SkComposeShader(shaderB, shaderA, mode); 43 shaderA->unref(); 44 shaderB->unref(); 45 mode->unref(); 46 47 return shader; 48} 49 50class ShaderView : public SampleView { 51public: 52 SkShader* fShader; 53 SkBitmap fBitmap; 54 55 ShaderView() { 56 SkImageDecoder::DecodeFile("/skimages/logo.gif", &fBitmap); 57 58 SkPoint pts[2]; 59 SkColor colors[2]; 60 61 pts[0].set(0, 0); 62 pts[1].set(SkIntToScalar(100), 0); 63 colors[0] = SK_ColorRED; 64 colors[1] = SK_ColorBLUE; 65 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode); 66 67 pts[0].set(0, 0); 68 pts[1].set(0, SkIntToScalar(100)); 69 colors[0] = SK_ColorBLACK; 70 colors[1] = SkColorSetARGB(0x80, 0, 0, 0); 71 SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode); 72 73 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode); 74 75 fShader = new SkComposeShader(shaderA, shaderB, mode); 76 shaderA->unref(); 77 shaderB->unref(); 78 mode->unref(); 79 } 80 virtual ~ShaderView() { 81 SkSafeUnref(fShader); 82 } 83 84protected: 85 // overrides from SkEventSink 86 virtual bool onQuery(SkEvent* evt) { 87 if (SampleCode::TitleQ(*evt)) { 88 SampleCode::TitleR(evt, "Shaders"); 89 return true; 90 } 91 return this->INHERITED::onQuery(evt); 92 } 93 94 virtual void onDrawContent(SkCanvas* canvas) { 95 canvas->drawBitmap(fBitmap, 0, 0); 96 97 canvas->translate(SkIntToScalar(20), SkIntToScalar(120)); 98 99 SkPaint paint; 100 SkRect r; 101 102 paint.setColor(SK_ColorGREEN); 103 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint); 104 paint.setShader(fShader); 105 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint); 106 107 canvas->translate(SkIntToScalar(110), 0); 108 109 int w = fBitmap.width(); 110 int h = fBitmap.height(); 111 w = 120; 112 h = 80; 113 r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h)); 114 115 paint.setShader(NULL); 116 canvas->drawRect(r, paint); 117 paint.setShader(make_bitmapfade(fBitmap))->unref(); 118 canvas->drawRect(r, paint); 119 120 paint.setShader(new SkTransparentShader)->unref(); 121 canvas->drawRect(r, paint); 122 } 123 124 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { 125 this->inval(NULL); 126 return this->INHERITED::onFindClickHandler(x, y); 127 } 128 129 virtual bool onClick(Click* click) { 130 return this->INHERITED::onClick(click); 131 } 132 133private: 134 typedef SampleView INHERITED; 135}; 136 137////////////////////////////////////////////////////////////////////////////// 138 139static SkView* MyFactory() { return new ShaderView; } 140static SkViewRegister reg(MyFactory); 141 142