1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm.h" 9 #include "SkBitmap.h" 10 #include "SkShader.h" 11 #include "SkXfermode.h" 12 #include "SkPM4f.h" 13 14 #include "SkArithmeticMode.h" 15 #include "SkPixelXorXfermode.h" 16 #include "SkAvoidXfermode.h" 17 18 #define kCustomShift 16 19 #define kCustomMask (~0xFFFF) 20 21 enum CustomModes { 22 kArithmetic_CustomMode = 1 << kCustomShift, 23 kPixelXor_CustomMode = 2 << kCustomShift, 24 kAvoid_CustomMode = 3 << kCustomShift, 25 }; 26 27 static SkXfermode* make_custom(int customMode) { 28 switch (customMode) { 29 case kArithmetic_CustomMode: { 30 const SkScalar k1 = 0.25; 31 const SkScalar k2 = 0.75; 32 const SkScalar k3 = 0.75; 33 const SkScalar k4 = -0.25; 34 return SkArithmeticMode::Create(k1, k2, k3, k4); 35 } 36 case kPixelXor_CustomMode: 37 return SkPixelXorXfermode::Create(0xFF88CC44); 38 case kAvoid_CustomMode: 39 return SkAvoidXfermode::Create(0xFFFF0000, 0x44, SkAvoidXfermode::kAvoidColor_Mode); 40 default: 41 break; 42 } 43 SkASSERT(false); 44 return nullptr; 45 } 46 47 enum SrcType { 48 //! A WxH image with a rectangle in the lower right. 49 kRectangleImage_SrcType = 0x01, 50 //! kRectangleImage_SrcType with an alpha of 34.5%. 51 kRectangleImageWithAlpha_SrcType = 0x02, 52 //! kRectnagleImageWithAlpha_SrcType scaled down by half. 53 kSmallRectangleImageWithAlpha_SrcType = 0x04, 54 //! kRectangleImage_SrcType drawn directly instead in an image. 55 kRectangle_SrcType = 0x08, 56 //! Two rectangles, first on the right half, second on the bottom half. 57 kQuarterClear_SrcType = 0x10, 58 //! kQuarterClear_SrcType in a layer. 59 kQuarterClearInLayer_SrcType = 0x20, 60 //! A W/2xH/2 transparent image. 61 kSmallTransparentImage_SrcType = 0x40, 62 //! kRectangleImage_SrcType drawn directly with a mask. 63 kRectangleWithMask_SrcType = 0x80, 64 65 kAll_SrcType = 0xFF, //!< All the source types. 66 kBasic_SrcType = 0x03, //!< Just basic source types. 67 }; 68 69 const struct { 70 SkXfermode::Mode fMode; 71 const char* fLabel; 72 int fSourceTypeMask; // The source types to use this 73 // mode with. See draw_mode for 74 // an explanation of each type. 75 // PDF has to play some tricks 76 // to support the base modes, 77 // test those more extensively. 78 } gModes[] = { 79 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType }, 80 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType }, 81 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType }, 82 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType }, 83 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType }, 84 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType }, 85 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType }, 86 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType }, 87 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType }, 88 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType }, 89 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType }, 90 91 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType }, 92 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType }, 93 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType }, 94 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType }, 95 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType }, 96 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType }, 97 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType }, 98 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType }, 99 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType }, 100 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType }, 101 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType }, 102 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType }, 103 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType }, 104 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType }, 105 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType }, 106 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType }, 107 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType }, 108 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType }, 109 110 { SkXfermode::Mode(0xFFFF), "Arithmetic", kBasic_SrcType + kArithmetic_CustomMode }, 111 { SkXfermode::Mode(0xFFFF), "PixelXor", kBasic_SrcType + kPixelXor_CustomMode }, 112 { SkXfermode::Mode(0xFFFF), "Avoid", kBasic_SrcType + kAvoid_CustomMode }, 113 }; 114 115 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst, 116 SkBitmap* transparent) { 117 src->allocN32Pixels(w, h); 118 src->eraseColor(SK_ColorTRANSPARENT); 119 120 SkPaint p; 121 p.setAntiAlias(true); 122 123 SkRect r; 124 SkScalar ww = SkIntToScalar(w); 125 SkScalar hh = SkIntToScalar(h); 126 127 { 128 SkCanvas c(*src); 129 p.setColor(sk_tool_utils::color_to_565(0xFFFFCC44)); 130 r.set(0, 0, ww*3/4, hh*3/4); 131 c.drawOval(r, p); 132 } 133 134 dst->allocN32Pixels(w, h); 135 dst->eraseColor(SK_ColorTRANSPARENT); 136 137 { 138 SkCanvas c(*dst); 139 p.setColor(sk_tool_utils::color_to_565(0xFF66AAFF)); 140 r.set(ww/3, hh/3, ww*19/20, hh*19/20); 141 c.drawRect(r, p); 142 } 143 144 transparent->allocN32Pixels(w, h); 145 transparent->eraseColor(SK_ColorTRANSPARENT); 146 } 147 148 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF }; 149 150 class XfermodesGM : public skiagm::GM { 151 SkBitmap fBG; 152 SkBitmap fSrcB, fDstB, fTransparent; 153 154 /* The srcType argument indicates what to draw for the source part. Skia 155 * uses the implied shape of the drawing command and these modes 156 * demonstrate that. 157 */ 158 void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType, 159 SkScalar x, SkScalar y) { 160 SkPaint p; 161 SkMatrix m; 162 bool restoreNeeded = false; 163 m.setTranslate(x, y); 164 165 canvas->drawBitmap(fSrcB, x, y, &p); 166 p.setXfermode(mode); 167 switch (srcType) { 168 case kSmallTransparentImage_SrcType: { 169 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 170 171 SkAutoCanvasRestore acr(canvas, true); 172 canvas->concat(m); 173 canvas->drawBitmap(fTransparent, 0, 0, &p); 174 break; 175 } 176 case kQuarterClearInLayer_SrcType: { 177 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W), 178 SkIntToScalar(H)); 179 canvas->saveLayer(&bounds, &p); 180 restoreNeeded = true; 181 p.setXfermodeMode(SkXfermode::kSrcOver_Mode); 182 // Fall through. 183 } 184 case kQuarterClear_SrcType: { 185 SkScalar halfW = SkIntToScalar(W) / 2; 186 SkScalar halfH = SkIntToScalar(H) / 2; 187 p.setColor(sk_tool_utils::color_to_565(0xFF66AAFF)); 188 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, 189 SkIntToScalar(H)); 190 canvas->drawRect(r, p); 191 p.setColor(sk_tool_utils::color_to_565(0xFFAA66FF)); 192 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH); 193 canvas->drawRect(r, p); 194 break; 195 } 196 case kRectangleWithMask_SrcType: { 197 canvas->save(); 198 restoreNeeded = true; 199 SkScalar w = SkIntToScalar(W); 200 SkScalar h = SkIntToScalar(H); 201 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60); 202 canvas->clipRect(r); 203 // Fall through. 204 } 205 case kRectangle_SrcType: { 206 SkScalar w = SkIntToScalar(W); 207 SkScalar h = SkIntToScalar(H); 208 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3, 209 w * 37 / 60, h * 37 / 60); 210 p.setColor(sk_tool_utils::color_to_565(0xFF66AAFF)); 211 canvas->drawRect(r, p); 212 break; 213 } 214 case kSmallRectangleImageWithAlpha_SrcType: 215 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y); 216 // Fall through. 217 case kRectangleImageWithAlpha_SrcType: 218 p.setAlpha(0x88); 219 // Fall through. 220 case kRectangleImage_SrcType: { 221 SkAutoCanvasRestore acr(canvas, true); 222 canvas->concat(m); 223 canvas->drawBitmap(fDstB, 0, 0, &p); 224 break; 225 } 226 default: 227 break; 228 } 229 230 if (restoreNeeded) { 231 canvas->restore(); 232 } 233 } 234 235 void onOnceBeforeDraw() override { 236 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, 237 kOpaque_SkAlphaType), 238 gData, 4); 239 240 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent); 241 } 242 243 public: 244 const static int W = 64; 245 const static int H = 64; 246 XfermodesGM() {} 247 248 protected: 249 SkString onShortName() override { 250 return SkString("xfermodes"); 251 } 252 253 SkISize onISize() override { 254 return SkISize::Make(1990, 660); 255 } 256 257 void onDraw(SkCanvas* canvas) override { 258 canvas->translate(SkIntToScalar(10), SkIntToScalar(20)); 259 260 const SkScalar w = SkIntToScalar(W); 261 const SkScalar h = SkIntToScalar(H); 262 SkMatrix m; 263 m.setScale(SkIntToScalar(6), SkIntToScalar(6)); 264 SkShader* s = SkShader::CreateBitmapShader(fBG, 265 SkShader::kRepeat_TileMode, 266 SkShader::kRepeat_TileMode, 267 &m); 268 269 SkPaint labelP; 270 labelP.setAntiAlias(true); 271 sk_tool_utils::set_portable_typeface(&labelP); 272 labelP.setTextAlign(SkPaint::kCenter_Align); 273 274 const int W = 5; 275 276 SkScalar x0 = 0; 277 SkScalar y0 = 0; 278 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) { 279 SkScalar x = x0, y = y0; 280 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { 281 if ((gModes[i].fSourceTypeMask & sourceType) == 0) { 282 continue; 283 } 284 SkAutoTUnref<SkXfermode> mode; 285 if (gModes[i].fSourceTypeMask & kCustomMask) { 286 mode.reset(make_custom(gModes[i].fSourceTypeMask & kCustomMask)); 287 } else { 288 mode.reset(SkXfermode::Create(gModes[i].fMode)); 289 } 290 SkRect r; 291 r.set(x, y, x+w, y+h); 292 293 SkPaint p; 294 p.setStyle(SkPaint::kFill_Style); 295 p.setShader(s); 296 canvas->drawRect(r, p); 297 298 canvas->saveLayer(&r, nullptr); 299 draw_mode(canvas, mode, static_cast<SrcType>(sourceType), 300 r.fLeft, r.fTop); 301 canvas->restore(); 302 303 r.inset(-SK_ScalarHalf, -SK_ScalarHalf); 304 p.setStyle(SkPaint::kStroke_Style); 305 p.setShader(nullptr); 306 canvas->drawRect(r, p); 307 308 #if 1 309 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel), 310 x + w/2, y - labelP.getTextSize()/2, labelP); 311 #endif 312 x += w + SkIntToScalar(10); 313 if ((i % W) == W - 1) { 314 x = x0; 315 y += h + SkIntToScalar(30); 316 } 317 } 318 if (y < 320) { 319 if (x > x0) { 320 y += h + SkIntToScalar(30); 321 } 322 y0 = y; 323 } else { 324 x0 += SkIntToScalar(400); 325 y0 = 0; 326 } 327 } 328 s->unref(); 329 } 330 331 private: 332 typedef GM INHERITED; 333 }; 334 DEF_GM( return new XfermodesGM; ) 335
