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 SkISize::Make(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); 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.allocN32Pixels(2, 2, true); 97 memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData)); 98 99 SkMatrix lm; 100 lm.setScale(SkIntToScalar(16), SkIntToScalar(16)); 101 fBG.reset(SkShader::CreateBitmapShader(bg, 102 SkShader::kRepeat_TileMode, 103 SkShader::kRepeat_TileMode, 104 &lm)); 105 106 SkBitmap dstBmp; 107 dstBmp.allocN32Pixels(kSize, kSize); 108 SkPMColor* pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels()); 109 110 for (int y = 0; y < kSize; ++y) { 111 int c = y * (1 << kShift); 112 SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2); 113 for (int x = 0; x < kSize; ++x) { 114 pixels[kSize * y + x] = rowColor; 115 } 116 } 117 fSrc.reset(SkShader::CreateBitmapShader(dstBmp, 118 SkShader::kClamp_TileMode, 119 SkShader::kClamp_TileMode)); 120 SkBitmap srcBmp; 121 srcBmp.allocN32Pixels(kSize, kSize); 122 pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels()); 123 124 for (int x = 0; x < kSize; ++x) { 125 int c = x * (1 << kShift); 126 SkPMColor colColor = SkPackARGB32(c, 0, c, c/2); 127 for (int y = 0; y < kSize; ++y) { 128 pixels[kSize * y + x] = colColor; 129 } 130 } 131 fDst.reset(SkShader::CreateBitmapShader(srcBmp, 132 SkShader::kClamp_TileMode, 133 SkShader::kClamp_TileMode)); 134 } 135 136 enum { 137 kShift = 2, 138 kSize = 256 >> kShift, 139 }; 140 141 SkAutoTUnref<SkShader> fBG; 142 SkAutoTUnref<SkShader> fSrc; 143 SkAutoTUnref<SkShader> fDst; 144 145 typedef GM INHERITED; 146 }; 147 148 ////////////////////////////////////////////////////////////////////////////// 149 150 static GM* MyFactory(void*) { return new Xfermodes2GM; } 151 static GMRegistry reg(MyFactory); 152 153 } 154
