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 "SampleCode.h" 9#include "SkView.h" 10#include "SkBitmap.h" 11#include "SkCanvas.h" 12#include "SkColorPriv.h" 13#include "SkShader.h" 14 15static const SkBlendMode gModes[] = { 16 SkBlendMode::kClear, 17 SkBlendMode::kSrc, 18 SkBlendMode::kDst, 19 SkBlendMode::kSrcOver, 20 SkBlendMode::kDstOver, 21 SkBlendMode::kSrcIn, 22 SkBlendMode::kDstIn, 23 SkBlendMode::kSrcOut, 24 SkBlendMode::kDstOut, 25 SkBlendMode::kSrcATop, 26 SkBlendMode::kDstATop, 27 SkBlendMode::kXor, 28}; 29 30const int gWidth = 64; 31const int gHeight = 64; 32const SkScalar W = SkIntToScalar(gWidth); 33const SkScalar H = SkIntToScalar(gHeight); 34 35static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) { 36 SkPaint paint; 37 paint.setAntiAlias(true); 38 39 SkRect r = SkRect::MakeWH(W, H); 40 r.inset(W/10, H/10); 41 42 paint.setColor(SK_ColorBLUE); 43 paint.setAlpha(a0); 44 canvas->drawOval(r, paint); 45 46 paint.setColor(SK_ColorRED); 47 paint.setAlpha(a1); 48 paint.setBlendMode(mode); 49 50 SkScalar offset = SK_Scalar1 / 3; 51 SkRect rect = SkRect::MakeXYWH(W / 4 + offset, 52 H / 4 + offset, 53 W / 2, H / 2); 54 canvas->drawRect(rect, paint); 55 56 return H; 57} 58 59static sk_sp<SkShader> make_bg_shader() { 60 SkBitmap bm; 61 bm.allocN32Pixels(2, 2); 62 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF; 63 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 64 0xCC, 0xCC); 65 66 SkMatrix m; 67 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 68 69 return SkShader::MakeBitmapShader(bm, 70 SkShader::kRepeat_TileMode, 71 SkShader::kRepeat_TileMode, 72 &m); 73} 74 75class AARectsModesView : public SampleView { 76 SkPaint fBGPaint; 77public: 78 AARectsModesView () { 79 fBGPaint.setShader(make_bg_shader()); 80 } 81 82protected: 83 // overrides from SkEventSink 84 virtual bool onQuery(SkEvent* evt) { 85 if (SampleCode::TitleQ(*evt)) { 86 SampleCode::TitleR(evt, "AARectsModes"); 87 return true; 88 } 89 return this->INHERITED::onQuery(evt); 90 } 91 92 virtual void onDrawContent(SkCanvas* canvas) { 93 const SkRect bounds = SkRect::MakeWH(W, H); 94 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 }; 95 96 canvas->translate(SkIntToScalar(4), SkIntToScalar(4)); 97 98 for (int alpha = 0; alpha < 4; ++alpha) { 99 canvas->save(); 100 canvas->save(); 101 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) { 102 if (6 == i) { 103 canvas->restore(); 104 canvas->translate(W * 5, 0); 105 canvas->save(); 106 } 107 108 canvas->drawRect(bounds, fBGPaint); 109 canvas->saveLayer(&bounds, nullptr); 110 SkScalar dy = drawCell(canvas, gModes[i], gAlphaValue[alpha & 1], 111 gAlphaValue[alpha & 2]); 112 canvas->restore(); 113 114 canvas->translate(0, dy * 5 / 4); 115 } 116 canvas->restore(); 117 canvas->restore(); 118 canvas->translate(W * 5 / 4, 0); 119 } 120 } 121 122private: 123 typedef SampleView INHERITED; 124}; 125 126/////////////////////////////////////////////////////////////////////////////// 127 128static SkView* MyFactory() { return new AARectsModesView; } 129static SkViewRegister reg(MyFactory); 130