1 2 /* 3 * Copyright 2013 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 "gm.h" 9 #include "SkBitmap.h" 10 #include "SkShader.h" 11 #include "SkXfermode.h" 12 #include "SkColorPriv.h" 13 14 namespace skiagm { 15 16 class Xfermodes2GM : public GM { 17 public: 18 Xfermodes2GM() {} 19 20 protected: 21 virtual SkString onShortName() SK_OVERRIDE { 22 return SkString("xfermodes2"); 23 } 24 25 virtual SkISize onISize() SK_OVERRIDE { 26 return make_isize(455, 475); 27 } 28 29 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { 30 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 31 32 const SkScalar w = SkIntToScalar(kSize); 33 const SkScalar h = SkIntToScalar(kSize); 34 35 SkPaint labelP; 36 labelP.setAntiAlias(true); 37 labelP.setTextAlign(SkPaint::kCenter_Align); 38 39 const int W = 6; 40 41 SkScalar x = 0, y = 0; 42 for (size_t m = 0; m <= SkXfermode::kLastMode; m++) { 43 SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m); 44 SkXfermode* xm = SkXfermode::Create(mode); 45 SkAutoUnref aur(xm); 46 47 canvas->save(); 48 49 canvas->translate(x, y); 50 SkPaint p; 51 p.setAntiAlias(false); 52 p.setStyle(SkPaint::kFill_Style); 53 p.setShader(fBG); 54 SkRect r = SkRect::MakeWH(w, h); 55 canvas->drawRect(r, p); 56 57 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); 58 59 p.setShader(fDst); 60 canvas->drawRect(r, p); 61 p.setShader(fSrc); 62 p.setXfermode(xm); 63 canvas->drawRect(r, p); 64 65 canvas->restore(); 66 67 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 68 p.setStyle(SkPaint::kStroke_Style); 69 p.setShader(NULL); 70 p.setXfermode(NULL); 71 canvas->drawRect(r, p); 72 73 canvas->restore(); 74 75 #if 1 76 canvas->drawText(SkXfermode::ModeName(mode), strlen(SkXfermode::ModeName(mode)), 77 x + w/2, y - labelP.getTextSize()/2, labelP); 78 #endif 79 x += w + SkIntToScalar(10); 80 if ((m % W) == W - 1) { 81 x = 0; 82 y += h + SkIntToScalar(30); 83 } 84 } 85 } 86 87 private: 88 virtual void onOnceBeforeDraw() SK_OVERRIDE { 89 static const uint32_t kCheckData[] = { 90 SkPackARGB32(0xFF, 0x40, 0x40, 0x40), 91 SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0), 92 SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0), 93 SkPackARGB32(0xFF, 0x40, 0x40, 0x40) 94 }; 95 SkBitmap bg; 96 bg.setConfig(SkBitmap::kARGB_8888_Config, 2, 2); 97 bg.allocPixels(); 98 SkAutoLockPixels bgAlp(bg); 99 memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData)); 100 bg.setIsOpaque(true); 101 102 fBG.reset(SkShader::CreateBitmapShader(bg, 103 SkShader::kRepeat_TileMode, 104 SkShader::kRepeat_TileMode)); 105 SkMatrix lm; 106 lm.setScale(SkIntToScalar(16), SkIntToScalar(16)); 107 fBG->setLocalMatrix(lm); 108 109 SkBitmap dstBmp; 110 dstBmp.setConfig(SkBitmap::kARGB_8888_Config, kSize, kSize); 111 dstBmp.allocPixels(); 112 SkAutoLockPixels dstAlp(dstBmp); 113 SkPMColor* pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels()); 114 115 for (int y = 0; y < kSize; ++y) { 116 int c = y * (1 << kShift); 117 SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2); 118 for (int x = 0; x < kSize; ++x) { 119 pixels[kSize * y + x] = rowColor; 120 } 121 } 122 fSrc.reset(SkShader::CreateBitmapShader(dstBmp, 123 SkShader::kClamp_TileMode, 124 SkShader::kClamp_TileMode)); 125 SkBitmap srcBmp; 126 srcBmp.setConfig(SkBitmap::kARGB_8888_Config, kSize, kSize); 127 srcBmp.allocPixels(); 128 SkAutoLockPixels srcAlp(srcBmp); 129 pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels()); 130 131 for (int x = 0; x < kSize; ++x) { 132 int c = x * (1 << kShift); 133 SkPMColor colColor = SkPackARGB32(c, 0, c, c/2); 134 for (int y = 0; y < kSize; ++y) { 135 pixels[kSize * y + x] = colColor; 136 } 137 } 138 fDst.reset(SkShader::CreateBitmapShader(srcBmp, 139 SkShader::kClamp_TileMode, 140 SkShader::kClamp_TileMode)); 141 } 142 143 enum { 144 kShift = 2, 145 kSize = 256 >> kShift, 146 }; 147 148 SkAutoTUnref<SkShader> fBG; 149 SkAutoTUnref<SkShader> fSrc; 150 SkAutoTUnref<SkShader> fDst; 151 152 typedef GM INHERITED; 153 }; 154 155 ////////////////////////////////////////////////////////////////////////////// 156 157 static GM* MyFactory(void*) { return new Xfermodes2GM; } 158 static GMRegistry reg(MyFactory); 159 160 } 161
