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 SkBitmap* transparent) { 17 src->setConfig(SkBitmap::kARGB_8888_Config, w, h); 18 src->allocPixels(); 19 src->eraseColor(SK_ColorTRANSPARENT); 20 21 SkPaint p; 22 p.setAntiAlias(true); 23 24 SkRect r; 25 SkScalar ww = SkIntToScalar(w); 26 SkScalar hh = SkIntToScalar(h); 27 28 { 29 SkCanvas c(*src); 30 p.setColor(0xFFFFCC44); 31 r.set(0, 0, ww*3/4, hh*3/4); 32 c.drawOval(r, p); 33 } 34 35 dst->setConfig(SkBitmap::kARGB_8888_Config, w, h); 36 dst->allocPixels(); 37 dst->eraseColor(SK_ColorTRANSPARENT); 38 39 { 40 SkCanvas c(*dst); 41 p.setColor(0xFF66AAFF); 42 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 43 c.drawRect(r, p); 44 } 45 46 transparent->setConfig(SkBitmap::kARGB_8888_Config, w, h); 47 transparent->allocPixels(); 48 transparent->eraseColor(SK_ColorTRANSPARENT); 49 } 50 51 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 52 53 class XfermodesGM : public GM { 54 enum SrcType { 55 //! A WxH image with a rectangle in the lower right. 56 kRectangleImage_SrcType = 0x01, 57 //! kRectangleImage_SrcType with an alpha of 34.5%. 58 kRectangleImageWithAlpha_SrcType = 0x02, 59 //! kRectnagleImageWithAlpha_SrcType scaled down by half. 60 kSmallRectangleImageWithAlpha_SrcType = 0x04, 61 //! kRectangleImage_SrcType drawn directly instead in an image. 62 kRectangle_SrcType = 0x08, 63 //! Two rectangles, first on the right half, second on the bottom half. 64 kQuarterClear_SrcType = 0x10, 65 //! kQuarterClear_SrcType in a layer. 66 kQuarterClearInLayer_SrcType = 0x20, 67 //! A W/2xH/2 transparent image. 68 kSmallTransparentImage_SrcType = 0x40, 69 //! kRectangleImage_SrcType drawn directly with a mask. 70 kRectangleWithMask_SrcType = 0x80, 71 72 kAll_SrcType = 0xFF, //!< All the source types. 73 kBasic_SrcType = 0x03, //!< Just basic source types. 74 }; 75 76 SkBitmap fBG; 77 SkBitmap fSrcB, fDstB, fTransparent; 78 79 /* The srcType argument indicates what to draw for the source part. Skia 80 * uses the implied shape of the drawing command and these modes 81 * demonstrate that. 82 */ 83 void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType, 84 SkScalar x, SkScalar y) { 85 SkPaint p; 86 SkMatrix m; 87 bool restoreNeeded = false; 88 m.setTranslate(x, y); 89 90 canvas->drawBitmapMatrix(fSrcB, m, &p); 91 p.setXfermode(mode); 92 switch (srcType) { 93 case kSmallTransparentImage_SrcType: 94 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 95 canvas->drawBitmapMatrix(fTransparent, m, &p); 96 break; 97 case kQuarterClearInLayer_SrcType: { 98 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), 99 SkIntToScalar(H)); 100 canvas->saveLayer(&bounds, &p); 101 restoreNeeded = true; 102 p.setXfermodeMode(SkXfermode::kSrcOver_Mode); 103 // Fall through. 104 } 105 case kQuarterClear_SrcType: { 106 SkScalar halfW = SkIntToScalar(W) / 2; 107 SkScalar halfH = SkIntToScalar(H) / 2; 108 p.setColor(0xFF66AAFF); 109 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, 110 SkIntToScalar(H)); 111 canvas->drawRect(r, p); 112 p.setColor(0xFFAA66FF); 113 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); 114 canvas->drawRect(r, p); 115 break; 116 } 117 case kRectangleWithMask_SrcType: { 118 canvas->save(SkCanvas::kClip_SaveFlag); 119 restoreNeeded = true; 120 SkScalar w = SkIntToScalar(W); 121 SkScalar h = SkIntToScalar(H); 122 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60); 123 canvas->clipRect(r); 124 // Fall through. 125 } 126 case kRectangle_SrcType: { 127 SkScalar w = SkIntToScalar(W); 128 SkScalar h = SkIntToScalar(H); 129 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, 130 w * 37 / 60, h * 37 / 60); 131 p.setColor(0xFF66AAFF); 132 canvas->drawRect(r, p); 133 break; 134 } 135 case kSmallRectangleImageWithAlpha_SrcType: 136 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 137 // Fall through. 138 case kRectangleImageWithAlpha_SrcType: 139 p.setAlpha(0x88); 140 // Fall through. 141 case kRectangleImage_SrcType: 142 canvas->drawBitmapMatrix(fDstB, m, &p); 143 break; 144 default: 145 break; 146 } 147 148 if (restoreNeeded) { 149 canvas->restore(); 150 } 151 } 152 153 virtual void onOnceBeforeDraw() SK_OVERRIDE { 154 fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4, kOpaque_SkAlphaType); 155 fBG.setPixels(gData); 156 157 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); 158 } 159 160 public: 161 const static int W = 64; 162 const static int H = 64; 163 XfermodesGM() {} 164 165 protected: 166 virtual SkString onShortName() { 167 return SkString("xfermodes"); 168 } 169 170 virtual SkISize onISize() { 171 return make_isize(1990, 640); 172 } 173 174 virtual void onDraw(SkCanvas* canvas) { 175 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 176 177 const struct { 178 SkXfermode::Mode fMode; 179 const char* fLabel; 180 int fSourceTypeMask; // The source types to use this 181 // mode with. See draw_mode for 182 // an explanation of each type. 183 // PDF has to play some tricks 184 // to support the base modes, 185 // test those more extensively. 186 } gModes[] = { 187 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType }, 188 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, 189 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, 190 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, 191 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, 192 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, 193 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, 194 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, 195 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, 196 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, 197 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, 198 199 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, 200 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, 201 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, 202 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, 203 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, 204 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, 205 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, 206 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, 207 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, 208 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, 209 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, 210 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, 211 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, 212 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, 213 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, 214 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, 215 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, 216 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, 217 }; 218 219 const SkScalar w = SkIntToScalar(W); 220 const SkScalar h = SkIntToScalar(H); 221 SkShader* s = SkShader::CreateBitmapShader(fBG, 222 SkShader::kRepeat_TileMode, 223 SkShader::kRepeat_TileMode); 224 SkMatrix m; 225 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 226 s->setLocalMatrix(m); 227 228 SkPaint labelP; 229 labelP.setAntiAlias(true); 230 labelP.setTextAlign(SkPaint::kCenter_Align); 231 232 const int W = 5; 233 234 SkScalar x0 = 0; 235 SkScalar y0 = 0; 236 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 237 SkScalar x = x0, y = y0; 238 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 239 if ((gModes[i].fSourceTypeMask & sourceType) == 0) { 240 continue; 241 } 242 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode); 243 SkAutoUnref aur(mode); 244 SkRect r; 245 r.set(x, y, x+w, y+h); 246 247 SkPaint p; 248 p.setStyle(SkPaint::kFill_Style); 249 p.setShader(s); 250 canvas->drawRect(r, p); 251 252 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); 253 draw_mode(canvas, mode, static_cast<SrcType>(sourceType), 254 r.fLeft, r.fTop); 255 canvas->restore(); 256 257 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 258 p.setStyle(SkPaint::kStroke_Style); 259 p.setShader(NULL); 260 canvas->drawRect(r, p); 261 262 #if 1 263 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 264 x + w/2, y - labelP.getTextSize()/2, labelP); 265 #endif 266 x += w + SkIntToScalar(10); 267 if ((i % W) == W - 1) { 268 x = x0; 269 y += h + SkIntToScalar(30); 270 } 271 } 272 if (y < 320) { 273 if (x > x0) { 274 y += h + SkIntToScalar(30); 275 } 276 y0 = y; 277 } else { 278 x0 += SkIntToScalar(400); 279 y0 = 0; 280 } 281 } 282 s->unref(); 283 } 284 285 private: 286 typedef GM INHERITED; 287 }; 288 289 ////////////////////////////////////////////////////////////////////////////// 290 291 static GM* MyFactory(void*) { return new XfermodesGM; } 292 static GMRegistry reg(MyFactory); 293 294 } 295
