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