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 "SkDevice.h" 12#include "SkColorPriv.h" 13#include "SkShader.h" 14 15static SkCanvas* create_canvas(int w, int h) { 16 SkBitmap bm; 17 bm.setConfig(SkBitmap::kARGB_8888_Config, w, h); 18 bm.allocPixels(); 19 bm.eraseColor(0); 20 return new SkCanvas(bm); 21} 22 23static const SkBitmap& extract_bitmap(SkCanvas* canvas) { 24 return canvas->getDevice()->accessBitmap(false); 25} 26 27static const struct { 28 SkXfermode::Mode fMode; 29 const char* fLabel; 30} gModes[] = { 31 { SkXfermode::kClear_Mode, "Clear" }, 32 { SkXfermode::kSrc_Mode, "Src" }, 33 { SkXfermode::kDst_Mode, "Dst" }, 34 { SkXfermode::kSrcOver_Mode, "SrcOver" }, 35 { SkXfermode::kDstOver_Mode, "DstOver" }, 36 { SkXfermode::kSrcIn_Mode, "SrcIn" }, 37 { SkXfermode::kDstIn_Mode, "DstIn" }, 38 { SkXfermode::kSrcOut_Mode, "SrcOut" }, 39 { SkXfermode::kDstOut_Mode, "DstOut" }, 40 { SkXfermode::kSrcATop_Mode, "SrcATop" }, 41 { SkXfermode::kDstATop_Mode, "DstATop" }, 42 { SkXfermode::kXor_Mode, "Xor" }, 43}; 44 45const int gWidth = 64; 46const int gHeight = 64; 47const SkScalar W = SkIntToScalar(gWidth); 48const SkScalar H = SkIntToScalar(gHeight); 49 50static SkScalar drawCell(SkCanvas* canvas, SkXfermode* mode, 51 SkAlpha a0, SkAlpha a1) { 52 53 SkPaint paint; 54 paint.setAntiAlias(true); 55 56 SkRect r = SkRect::MakeWH(W, H); 57 r.inset(W/10, H/10); 58 59 paint.setColor(SK_ColorBLUE); 60 paint.setAlpha(a0); 61 canvas->drawOval(r, paint); 62 63 paint.setColor(SK_ColorRED); 64 paint.setAlpha(a1); 65 paint.setXfermode(mode); 66 67 SkScalar offset = SK_Scalar1 / 3; 68 SkRect rect = SkRect::MakeXYWH(W / 4 + offset, 69 H / 4 + offset, 70 W / 2, H / 2); 71 canvas->drawRect(rect, paint); 72 73 return H; 74} 75 76static SkShader* make_bg_shader() { 77 SkBitmap bm; 78 bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2); 79 bm.allocPixels(); 80 *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF; 81 *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC, 82 0xCC, 0xCC); 83 84 SkShader* s = SkShader::CreateBitmapShader(bm, 85 SkShader::kRepeat_TileMode, 86 SkShader::kRepeat_TileMode); 87 88 SkMatrix m; 89 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 90 s->setLocalMatrix(m); 91 return s; 92} 93 94class AARectsModesView : public SampleView { 95 SkPaint fBGPaint; 96public: 97 AARectsModesView () { 98 fBGPaint.setShader(make_bg_shader())->unref(); 99 } 100 101protected: 102 // overrides from SkEventSink 103 virtual bool onQuery(SkEvent* evt) { 104 if (SampleCode::TitleQ(*evt)) { 105 SampleCode::TitleR(evt, "AARectsModes"); 106 return true; 107 } 108 return this->INHERITED::onQuery(evt); 109 } 110 111 virtual void onDrawContent(SkCanvas* canvas) { 112 const SkRect bounds = SkRect::MakeWH(W, H); 113 static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 }; 114 115 canvas->translate(SkIntToScalar(4), SkIntToScalar(4)); 116 117 for (int alpha = 0; alpha < 4; ++alpha) { 118 canvas->save(); 119 canvas->save(); 120 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) { 121 if (6 == i) { 122 canvas->restore(); 123 canvas->translate(W * 5, 0); 124 canvas->save(); 125 } 126 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 127 128 canvas->drawRect(bounds, fBGPaint); 129 canvas->saveLayer(&bounds, NULL); 130 SkScalar dy = drawCell(canvas, mode, 131 gAlphaValue[alpha & 1], 132 gAlphaValue[alpha & 2]); 133 canvas->restore(); 134 135 canvas->translate(0, dy * 5 / 4); 136 SkSafeUnref(mode); 137 } 138 canvas->restore(); 139 canvas->restore(); 140 canvas->translate(W * 5 / 4, 0); 141 } 142 } 143 144private: 145 typedef SampleView INHERITED; 146}; 147 148/////////////////////////////////////////////////////////////////////////////// 149 150static SkView* MyFactory() { return new AARectsModesView; } 151static SkViewRegister reg(MyFactory); 152 153