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 SkString onShortName() override { 22 return SkString("xfermodes2"); 23 } 24 25 SkISize onISize() override { 26 return SkISize::Make(455, 475); 27 } 28 29 void onDraw(SkCanvas* canvas) 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 sk_tool_utils::set_portable_typeface(&labelP); 38 labelP.setTextAlign(SkPaint::kCenter_Align); 39 40 const int W = 6; 41 42 SkScalar x = 0, y = 0; 43 for (size_t m = 0; m <= SkXfermode::kLastMode; m++) { 44 SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(m); 45 SkXfermode* xm = SkXfermode::Create(mode); 46 SkAutoUnref aur(xm); 47 48 canvas->save(); 49 50 canvas->translate(x, y); 51 SkPaint p; 52 p.setAntiAlias(false); 53 p.setStyle(SkPaint::kFill_Style); 54 p.setShader(fBG); 55 SkRect r = SkRect::MakeWH(w, h); 56 canvas->drawRect(r, p); 57 58 canvas->saveLayer(&r, NULL); 59 60 p.setShader(fDst); 61 canvas->drawRect(r, p); 62 p.setShader(fSrc); 63 p.setXfermode(xm); 64 canvas->drawRect(r, p); 65 66 canvas->restore(); 67 68 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 69 p.setStyle(SkPaint::kStroke_Style); 70 p.setShader(NULL); 71 p.setXfermode(NULL); 72 canvas->drawRect(r, p); 73 74 canvas->restore(); 75 76 #if 1 77 canvas->drawText(SkXfermode::ModeName(mode), strlen(SkXfermode::ModeName(mode)), 78 x + w/2, y - labelP.getTextSize()/2, labelP); 79 #endif 80 x += w + SkIntToScalar(10); 81 if ((m % W) == W - 1) { 82 x = 0; 83 y += h + SkIntToScalar(30); 84 } 85 } 86 } 87 88 private: 89 void onOnceBeforeDraw() override { 90 static const uint32_t kCheckData[] = { 91 SkPackARGB32(0xFF, 0x40, 0x40, 0x40), 92 SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0), 93 SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0), 94 SkPackARGB32(0xFF, 0x40, 0x40, 0x40) 95 }; 96 SkBitmap bg; 97 bg.allocN32Pixels(2, 2, true); 98 memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData)); 99 100 SkMatrix lm; 101 lm.setScale(SkIntToScalar(16), SkIntToScalar(16)); 102 fBG.reset(SkShader::CreateBitmapShader(bg, 103 SkShader::kRepeat_TileMode, 104 SkShader::kRepeat_TileMode, 105 &lm)); 106 107 SkBitmap srcBmp; 108 srcBmp.allocN32Pixels(kSize, kSize); 109 SkPMColor* pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels()); 110 111 for (int y = 0; y < kSize; ++y) { 112 int c = y * (1 << kShift); 113 SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2); 114 for (int x = 0; x < kSize; ++x) { 115 pixels[kSize * y + x] = rowColor; 116 } 117 } 118 fSrc.reset(SkShader::CreateBitmapShader(srcBmp, 119 SkShader::kClamp_TileMode, 120 SkShader::kClamp_TileMode)); 121 SkBitmap dstBmp; 122 dstBmp.allocN32Pixels(kSize, kSize); 123 pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels()); 124 125 for (int x = 0; x < kSize; ++x) { 126 int c = x * (1 << kShift); 127 SkPMColor colColor = SkPackARGB32(c, 0, c, c/2); 128 for (int y = 0; y < kSize; ++y) { 129 pixels[kSize * y + x] = colColor; 130 } 131 } 132 fDst.reset(SkShader::CreateBitmapShader(dstBmp, 133 SkShader::kClamp_TileMode, 134 SkShader::kClamp_TileMode)); 135 } 136 137 enum { 138 kShift = 2, 139 kSize = 256 >> kShift, 140 }; 141 142 SkAutoTUnref<SkShader> fBG; 143 SkAutoTUnref<SkShader> fSrc; 144 SkAutoTUnref<SkShader> fDst; 145 146 typedef GM INHERITED; 147 }; 148 149 ////////////////////////////////////////////////////////////////////////////// 150 151 static GM* MyFactory(void*) { return new Xfermodes2GM; } 152 static GMRegistry reg(MyFactory); 153 154 } 155
