1 2 /* 3 * Copyright 2011 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 13 namespace skiagm { 14 15 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) { 16 src->setConfig(SkBitmap::kARGB_8888_Config, w, h); 17 src->allocPixels(); 18 src->eraseColor(SK_ColorTRANSPARENT); 19 20 SkPaint p; 21 p.setAntiAlias(true); 22 23 SkRect r; 24 SkScalar ww = SkIntToScalar(w); 25 SkScalar hh = SkIntToScalar(h); 26 27 { 28 SkCanvas c(*src); 29 p.setColor(0xFFFFCC44); 30 r.set(0, 0, ww*3/4, hh*3/4); 31 c.drawOval(r, p); 32 } 33 34 dst->setConfig(SkBitmap::kARGB_8888_Config, w, h); 35 dst->allocPixels(); 36 dst->eraseColor(SK_ColorTRANSPARENT); 37 38 { 39 SkCanvas c(*dst); 40 p.setColor(0xFF66AAFF); 41 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 42 c.drawRect(r, p); 43 } 44 } 45 46 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 47 48 class XfermodesGM : public GM { 49 SkBitmap fBG; 50 SkBitmap fSrcB, fDstB; 51 52 void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha, 53 SkScalar x, SkScalar y) { 54 SkPaint p; 55 56 canvas->drawBitmap(fSrcB, x, y, &p); 57 p.setAlpha(alpha); 58 p.setXfermode(mode); 59 canvas->drawBitmap(fDstB, x, y, &p); 60 } 61 62 virtual void onOnceBeforeDraw() SK_OVERRIDE { 63 fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4); 64 fBG.setPixels(gData); 65 fBG.setIsOpaque(true); 66 67 make_bitmaps(W, H, &fSrcB, &fDstB); 68 } 69 70 public: 71 const static int W = 64; 72 const static int H = 64; 73 XfermodesGM() {} 74 75 protected: 76 virtual SkString onShortName() { 77 return SkString("xfermodes"); 78 } 79 80 virtual SkISize onISize() { 81 return make_isize(790, 640); 82 } 83 84 virtual void onDraw(SkCanvas* canvas) { 85 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 86 87 const struct { 88 SkXfermode::Mode fMode; 89 const char* fLabel; 90 } gModes[] = { 91 { SkXfermode::kClear_Mode, "Clear" }, 92 { SkXfermode::kSrc_Mode, "Src" }, 93 { SkXfermode::kDst_Mode, "Dst" }, 94 { SkXfermode::kSrcOver_Mode, "SrcOver" }, 95 { SkXfermode::kDstOver_Mode, "DstOver" }, 96 { SkXfermode::kSrcIn_Mode, "SrcIn" }, 97 { SkXfermode::kDstIn_Mode, "DstIn" }, 98 { SkXfermode::kSrcOut_Mode, "SrcOut" }, 99 { SkXfermode::kDstOut_Mode, "DstOut" }, 100 { SkXfermode::kSrcATop_Mode, "SrcATop" }, 101 { SkXfermode::kDstATop_Mode, "DstATop" }, 102 { SkXfermode::kXor_Mode, "Xor" }, 103 104 { SkXfermode::kPlus_Mode, "Plus" }, 105 { SkXfermode::kModulate_Mode, "Modulate" }, 106 { SkXfermode::kScreen_Mode, "Screen" }, 107 { SkXfermode::kOverlay_Mode, "Overlay" }, 108 { SkXfermode::kDarken_Mode, "Darken" }, 109 { SkXfermode::kLighten_Mode, "Lighten" }, 110 { SkXfermode::kColorDodge_Mode, "ColorDodge" }, 111 { SkXfermode::kColorBurn_Mode, "ColorBurn" }, 112 { SkXfermode::kHardLight_Mode, "HardLight" }, 113 { SkXfermode::kSoftLight_Mode, "SoftLight" }, 114 { SkXfermode::kDifference_Mode, "Difference" }, 115 { SkXfermode::kExclusion_Mode, "Exclusion" }, 116 }; 117 118 const SkScalar w = SkIntToScalar(W); 119 const SkScalar h = SkIntToScalar(H); 120 SkShader* s = SkShader::CreateBitmapShader(fBG, 121 SkShader::kRepeat_TileMode, 122 SkShader::kRepeat_TileMode); 123 SkMatrix m; 124 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 125 s->setLocalMatrix(m); 126 127 SkPaint labelP; 128 labelP.setAntiAlias(true); 129 labelP.setTextAlign(SkPaint::kCenter_Align); 130 131 const int W = 5; 132 133 SkScalar x0 = 0; 134 for (int twice = 0; twice < 2; twice++) { 135 SkScalar x = x0, y = 0; 136 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 137 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 138 SkAutoUnref aur(mode); 139 SkRect r; 140 r.set(x, y, x+w, y+h); 141 142 SkPaint p; 143 p.setStyle(SkPaint::kFill_Style); 144 p.setShader(s); 145 canvas->drawRect(r, p); 146 147 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); 148 draw_mode(canvas, mode, twice ? 0x88 : 0xFF, r.fLeft, r.fTop); 149 canvas->restore(); 150 151 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 152 p.setStyle(SkPaint::kStroke_Style); 153 p.setShader(NULL); 154 canvas->drawRect(r, p); 155 156 #if 1 157 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 158 x + w/2, y - labelP.getTextSize()/2, labelP); 159 #endif 160 x += w + SkIntToScalar(10); 161 if ((i % W) == W - 1) { 162 x = x0; 163 y += h + SkIntToScalar(30); 164 } 165 } 166 x0 += SkIntToScalar(400); 167 } 168 s->unref(); 169 } 170 171 private: 172 typedef GM INHERITED; 173 }; 174 175 ////////////////////////////////////////////////////////////////////////////// 176 177 static GM* MyFactory(void*) { return new XfermodesGM; } 178 static GMRegistry reg(MyFactory); 179 180 } 181
