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| 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::Mode
Name(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 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 } |
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