reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "SkXfermode.h" |
| 18 | #include "SkColorPriv.h" |
| 19 | |
| 20 | #define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b) |
| 21 | |
| 22 | static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, U8CPU alpha) { |
| 23 | unsigned scale = SkAlpha255To256(alpha); |
| 24 | |
| 25 | unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale); |
| 26 | unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale); |
| 27 | unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale); |
| 28 | unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale); |
| 29 | |
| 30 | return SkPackARGB32(a, r, g, b); |
| 31 | } |
| 32 | |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 33 | #if 0 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 34 | // idea for higher precision blends in xfer procs (and slightly faster) |
| 35 | // see DstATop as a probable caller |
| 36 | static U8CPU mulmuldiv255round(U8CPU a, U8CPU b, U8CPU c, U8CPU d) { |
| 37 | SkASSERT(a <= 255); |
| 38 | SkASSERT(b <= 255); |
| 39 | SkASSERT(c <= 255); |
| 40 | SkASSERT(d <= 255); |
| 41 | unsigned prod = SkMulS16(a, b) + SkMulS16(c, d) + 128; |
| 42 | unsigned result = (prod + (prod >> 8)) >> 8; |
| 43 | SkASSERT(result <= 255); |
| 44 | return result; |
| 45 | } |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 46 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 47 | |
| 48 | /////////////////////////////////////////////////////////////////////////////// |
| 49 | |
| 50 | bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) { |
| 51 | return false; |
| 52 | } |
| 53 | |
| 54 | SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) { |
| 55 | // no-op. subclasses should override this |
| 56 | return dst; |
| 57 | } |
| 58 | |
| 59 | void SkXfermode::xfer32(SK_RESTRICT SkPMColor dst[], |
| 60 | const SK_RESTRICT SkPMColor src[], int count, |
| 61 | const SK_RESTRICT SkAlpha aa[]) { |
| 62 | SkASSERT(dst && src && count >= 0); |
| 63 | |
| 64 | if (NULL == aa) { |
| 65 | for (int i = count - 1; i >= 0; --i) { |
| 66 | dst[i] = this->xferColor(src[i], dst[i]); |
| 67 | } |
| 68 | } else { |
| 69 | for (int i = count - 1; i >= 0; --i) { |
| 70 | unsigned a = aa[i]; |
| 71 | if (0 != a) { |
| 72 | SkPMColor dstC = dst[i]; |
| 73 | SkPMColor C = this->xferColor(src[i], dstC); |
| 74 | if (0xFF != a) { |
| 75 | C = SkFourByteInterp(C, dstC, a); |
| 76 | } |
| 77 | dst[i] = C; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | void SkXfermode::xfer16(SK_RESTRICT uint16_t dst[], |
| 84 | const SK_RESTRICT SkPMColor src[], int count, |
| 85 | const SK_RESTRICT SkAlpha aa[]) { |
| 86 | SkASSERT(dst && src && count >= 0); |
| 87 | |
| 88 | if (NULL == aa) { |
| 89 | for (int i = count - 1; i >= 0; --i) { |
| 90 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 91 | dst[i] = SkPixel32ToPixel16_ToU16(this->xferColor(src[i], dstC)); |
| 92 | } |
| 93 | } else { |
| 94 | for (int i = count - 1; i >= 0; --i) { |
| 95 | unsigned a = aa[i]; |
| 96 | if (0 != a) { |
| 97 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 98 | SkPMColor C = this->xferColor(src[i], dstC); |
| 99 | if (0xFF != a) { |
| 100 | C = SkFourByteInterp(C, dstC, a); |
| 101 | } |
| 102 | dst[i] = SkPixel32ToPixel16_ToU16(C); |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | void SkXfermode::xfer4444(SK_RESTRICT SkPMColor16 dst[], |
| 109 | const SK_RESTRICT SkPMColor src[], int count, |
| 110 | const SK_RESTRICT SkAlpha aa[]) |
| 111 | { |
| 112 | SkASSERT(dst && src && count >= 0); |
| 113 | |
| 114 | if (NULL == aa) { |
| 115 | for (int i = count - 1; i >= 0; --i) { |
| 116 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 117 | dst[i] = SkPixel32ToPixel4444(this->xferColor(src[i], dstC)); |
| 118 | } |
| 119 | } else { |
| 120 | for (int i = count - 1; i >= 0; --i) { |
| 121 | unsigned a = aa[i]; |
| 122 | if (0 != a) { |
| 123 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 124 | SkPMColor C = this->xferColor(src[i], dstC); |
| 125 | if (0xFF != a) { |
| 126 | C = SkFourByteInterp(C, dstC, a); |
| 127 | } |
| 128 | dst[i] = SkPixel32ToPixel4444(C); |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | void SkXfermode::xferA8(SK_RESTRICT SkAlpha dst[], |
| 135 | const SkPMColor src[], int count, |
| 136 | const SK_RESTRICT SkAlpha aa[]) |
| 137 | { |
| 138 | SkASSERT(dst && src && count >= 0); |
| 139 | |
| 140 | if (NULL == aa) { |
| 141 | for (int i = count - 1; i >= 0; --i) { |
| 142 | SkPMColor res = this->xferColor(src[i], (dst[i] << SK_A32_SHIFT)); |
| 143 | dst[i] = SkToU8(SkGetPackedA32(res)); |
| 144 | } |
| 145 | } else { |
| 146 | for (int i = count - 1; i >= 0; --i) { |
| 147 | unsigned a = aa[i]; |
| 148 | if (0 != a) { |
| 149 | SkAlpha dstA = dst[i]; |
| 150 | unsigned A = SkGetPackedA32(this->xferColor(src[i], |
| 151 | (SkPMColor)(dstA << SK_A32_SHIFT))); |
| 152 | if (0xFF != a) { |
| 153 | A = SkAlphaBlend(A, dstA, SkAlpha255To256(a)); |
| 154 | } |
| 155 | dst[i] = SkToU8(A); |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /////////////////////////////////////////////////////////////////////////////// |
| 162 | |
| 163 | void SkProcXfermode::xfer32(SK_RESTRICT SkPMColor dst[], |
| 164 | const SK_RESTRICT SkPMColor src[], int count, |
| 165 | const SK_RESTRICT SkAlpha aa[]) { |
| 166 | SkASSERT(dst && src && count >= 0); |
| 167 | |
| 168 | SkXfermodeProc proc = fProc; |
| 169 | |
| 170 | if (NULL != proc) { |
| 171 | if (NULL == aa) { |
| 172 | for (int i = count - 1; i >= 0; --i) { |
| 173 | dst[i] = proc(src[i], dst[i]); |
| 174 | } |
| 175 | } else { |
| 176 | for (int i = count - 1; i >= 0; --i) { |
| 177 | unsigned a = aa[i]; |
| 178 | if (0 != a) { |
| 179 | SkPMColor dstC = dst[i]; |
| 180 | SkPMColor C = proc(src[i], dstC); |
| 181 | if (a != 0xFF) { |
| 182 | C = SkFourByteInterp(C, dstC, a); |
| 183 | } |
| 184 | dst[i] = C; |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | void SkProcXfermode::xfer16(SK_RESTRICT uint16_t dst[], |
| 192 | const SK_RESTRICT SkPMColor src[], int count, |
| 193 | const SK_RESTRICT SkAlpha aa[]) { |
| 194 | SkASSERT(dst && src && count >= 0); |
| 195 | |
| 196 | SkXfermodeProc proc = fProc; |
| 197 | |
| 198 | if (NULL != proc) { |
| 199 | if (NULL == aa) { |
| 200 | for (int i = count - 1; i >= 0; --i) { |
| 201 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 202 | dst[i] = SkPixel32ToPixel16_ToU16(proc(src[i], dstC)); |
| 203 | } |
| 204 | } else { |
| 205 | for (int i = count - 1; i >= 0; --i) { |
| 206 | unsigned a = aa[i]; |
| 207 | if (0 != a) { |
| 208 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 209 | SkPMColor C = proc(src[i], dstC); |
| 210 | if (0xFF != a) { |
| 211 | C = SkFourByteInterp(C, dstC, a); |
| 212 | } |
| 213 | dst[i] = SkPixel32ToPixel16_ToU16(C); |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | void SkProcXfermode::xfer4444(SK_RESTRICT SkPMColor16 dst[], |
| 221 | const SK_RESTRICT SkPMColor src[], int count, |
| 222 | const SK_RESTRICT SkAlpha aa[]) { |
| 223 | SkASSERT(dst && src && count >= 0); |
| 224 | |
| 225 | SkXfermodeProc proc = fProc; |
| 226 | |
| 227 | if (NULL != proc) { |
| 228 | if (NULL == aa) { |
| 229 | for (int i = count - 1; i >= 0; --i) { |
| 230 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 231 | dst[i] = SkPixel32ToPixel4444(proc(src[i], dstC)); |
| 232 | } |
| 233 | } else { |
| 234 | for (int i = count - 1; i >= 0; --i) { |
| 235 | unsigned a = aa[i]; |
| 236 | if (0 != a) { |
| 237 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 238 | SkPMColor C = proc(src[i], dstC); |
| 239 | if (0xFF != a) { |
| 240 | C = SkFourByteInterp(C, dstC, a); |
| 241 | } |
| 242 | dst[i] = SkPixel32ToPixel4444(C); |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | void SkProcXfermode::xferA8(SK_RESTRICT SkAlpha dst[], |
| 250 | const SK_RESTRICT SkPMColor src[], int count, |
| 251 | const SK_RESTRICT SkAlpha aa[]) { |
| 252 | SkASSERT(dst && src && count >= 0); |
| 253 | |
| 254 | SkXfermodeProc proc = fProc; |
| 255 | |
| 256 | if (NULL != proc) { |
| 257 | if (NULL == aa) { |
| 258 | for (int i = count - 1; i >= 0; --i) { |
| 259 | SkPMColor res = proc(src[i], dst[i] << SK_A32_SHIFT); |
| 260 | dst[i] = SkToU8(SkGetPackedA32(res)); |
| 261 | } |
| 262 | } else { |
| 263 | for (int i = count - 1; i >= 0; --i) { |
| 264 | unsigned a = aa[i]; |
| 265 | if (0 != a) { |
| 266 | SkAlpha dstA = dst[i]; |
| 267 | SkPMColor res = proc(src[i], dstA << SK_A32_SHIFT); |
| 268 | unsigned A = SkGetPackedA32(res); |
| 269 | if (0xFF != a) { |
| 270 | A = SkAlphaBlend(A, dstA, SkAlpha255To256(a)); |
| 271 | } |
| 272 | dst[i] = SkToU8(A); |
| 273 | } |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | SkProcXfermode::SkProcXfermode(SkFlattenableReadBuffer& buffer) |
| 280 | : SkXfermode(buffer) { |
| 281 | fProc = (SkXfermodeProc)buffer.readFunctionPtr(); |
| 282 | } |
| 283 | |
| 284 | void SkProcXfermode::flatten(SkFlattenableWriteBuffer& buffer) { |
| 285 | buffer.writeFunctionPtr((void*)fProc); |
| 286 | } |
| 287 | |
| 288 | /////////////////////////////////////////////////////////////////////////////// |
| 289 | /////////////////////////////////////////////////////////////////////////////// |
| 290 | |
| 291 | class SkProcCoeffXfermode : public SkProcXfermode { |
| 292 | public: |
| 293 | SkProcCoeffXfermode(SkXfermodeProc proc, Coeff sc, Coeff dc) |
| 294 | : INHERITED(proc), fSrcCoeff(sc), fDstCoeff(dc) { |
| 295 | } |
| 296 | |
| 297 | virtual bool asCoeff(Coeff* sc, Coeff* dc) { |
| 298 | if (sc) { |
| 299 | *sc = fSrcCoeff; |
| 300 | } |
| 301 | if (dc) { |
| 302 | *dc = fDstCoeff; |
| 303 | } |
| 304 | return true; |
| 305 | } |
| 306 | |
| 307 | virtual Factory getFactory() { return CreateProc; } |
| 308 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 309 | this->INHERITED::flatten(buffer); |
| 310 | buffer.write32(fSrcCoeff); |
| 311 | buffer.write32(fDstCoeff); |
| 312 | } |
| 313 | |
| 314 | protected: |
| 315 | SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer) |
| 316 | : INHERITED(buffer) { |
| 317 | fSrcCoeff = (Coeff)buffer.readU32(); |
| 318 | fDstCoeff = (Coeff)buffer.readU32(); |
| 319 | } |
| 320 | |
| 321 | private: |
| 322 | Coeff fSrcCoeff, fDstCoeff; |
| 323 | |
| 324 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 325 | return SkNEW_ARGS(SkProcCoeffXfermode, (buffer)); } |
| 326 | |
| 327 | typedef SkProcXfermode INHERITED; |
| 328 | }; |
| 329 | |
| 330 | /////////////////////////////////////////////////////////////////////////////// |
| 331 | |
| 332 | // kClear_Mode, //!< [0, 0] |
| 333 | static SkPMColor clear_modeproc(SkPMColor src, SkPMColor dst) { |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | // kSrc_Mode, //!< [Sa, Sc] |
| 338 | static SkPMColor src_modeproc(SkPMColor src, SkPMColor dst) { |
| 339 | return src; |
| 340 | } |
| 341 | |
| 342 | // kDst_Mode, //!< [Da, Dc] |
| 343 | static SkPMColor dst_modeproc(SkPMColor src, SkPMColor dst) { |
| 344 | return dst; |
| 345 | } |
| 346 | |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame^] | 347 | // kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Sc + (1 - Sa)*Dc] |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 348 | static SkPMColor srcover_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame^] | 349 | #if 0 |
| 350 | // this is the old, more-correct way, but it doesn't guarantee that dst==255 |
| 351 | // will always stay opaque |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 352 | return src + SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src))); |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame^] | 353 | #else |
| 354 | // this is slightly faster, but more importantly guarantees that dst==255 |
| 355 | // will always stay opaque |
| 356 | return src + SkAlphaMulQ(dst, 256 - SkGetPackedA32(src)); |
| 357 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 358 | } |
| 359 | |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame^] | 360 | // kDstOver_Mode, //!< [Sa + Da - Sa*Da, Dc + (1 - Da)*Sc] |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 361 | static SkPMColor dstover_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame^] | 362 | // this is the reverse of srcover, just flipping src and dst |
| 363 | // see srcover's comment about the 256 for opaqueness guarantees |
| 364 | return dst + SkAlphaMulQ(src, 256 - SkGetPackedA32(dst)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | // kSrcIn_Mode, //!< [Sa * Da, Sc * Da] |
| 368 | static SkPMColor srcin_modeproc(SkPMColor src, SkPMColor dst) { |
| 369 | return SkAlphaMulQ(src, SkAlpha255To256(SkGetPackedA32(dst))); |
| 370 | } |
| 371 | |
| 372 | // kDstIn_Mode, //!< [Sa * Da, Sa * Dc] |
| 373 | static SkPMColor dstin_modeproc(SkPMColor src, SkPMColor dst) { |
| 374 | return SkAlphaMulQ(dst, SkAlpha255To256(SkGetPackedA32(src))); |
| 375 | } |
| 376 | |
| 377 | // kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)] |
| 378 | static SkPMColor srcout_modeproc(SkPMColor src, SkPMColor dst) { |
| 379 | return SkAlphaMulQ(src, SkAlpha255To256(255 - SkGetPackedA32(dst))); |
| 380 | } |
| 381 | |
| 382 | // kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)] |
| 383 | static SkPMColor dstout_modeproc(SkPMColor src, SkPMColor dst) { |
| 384 | return SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src))); |
| 385 | } |
| 386 | |
| 387 | // kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc] |
| 388 | static SkPMColor srcatop_modeproc(SkPMColor src, SkPMColor dst) { |
| 389 | unsigned sa = SkGetPackedA32(src); |
| 390 | unsigned da = SkGetPackedA32(dst); |
| 391 | unsigned isa = 255 - sa; |
| 392 | |
| 393 | return SkPackARGB32(da, |
| 394 | SkAlphaMulAlpha(da, SkGetPackedR32(src)) + |
| 395 | SkAlphaMulAlpha(isa, SkGetPackedR32(dst)), |
| 396 | SkAlphaMulAlpha(da, SkGetPackedG32(src)) + |
| 397 | SkAlphaMulAlpha(isa, SkGetPackedG32(dst)), |
| 398 | SkAlphaMulAlpha(da, SkGetPackedB32(src)) + |
| 399 | SkAlphaMulAlpha(isa, SkGetPackedB32(dst))); |
| 400 | } |
| 401 | |
| 402 | // kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)] |
| 403 | static SkPMColor dstatop_modeproc(SkPMColor src, SkPMColor dst) { |
| 404 | unsigned sa = SkGetPackedA32(src); |
| 405 | unsigned da = SkGetPackedA32(dst); |
| 406 | unsigned ida = 255 - da; |
| 407 | |
| 408 | return SkPackARGB32(sa, |
| 409 | SkAlphaMulAlpha(ida, SkGetPackedR32(src)) + |
| 410 | SkAlphaMulAlpha(sa, SkGetPackedR32(dst)), |
| 411 | SkAlphaMulAlpha(ida, SkGetPackedG32(src)) + |
| 412 | SkAlphaMulAlpha(sa, SkGetPackedG32(dst)), |
| 413 | SkAlphaMulAlpha(ida, SkGetPackedB32(src)) + |
| 414 | SkAlphaMulAlpha(sa, SkGetPackedB32(dst))); |
| 415 | } |
| 416 | |
| 417 | // kXor_Mode [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc] |
| 418 | static SkPMColor xor_modeproc(SkPMColor src, SkPMColor dst) { |
| 419 | unsigned sa = SkGetPackedA32(src); |
| 420 | unsigned da = SkGetPackedA32(dst); |
| 421 | unsigned isa = 255 - sa; |
| 422 | unsigned ida = 255 - da; |
| 423 | |
| 424 | return SkPackARGB32(sa + da - (SkAlphaMulAlpha(sa, da) << 1), |
| 425 | SkAlphaMulAlpha(ida, SkGetPackedR32(src)) + |
| 426 | SkAlphaMulAlpha(isa, SkGetPackedR32(dst)), |
| 427 | SkAlphaMulAlpha(ida, SkGetPackedG32(src)) + |
| 428 | SkAlphaMulAlpha(isa, SkGetPackedG32(dst)), |
| 429 | SkAlphaMulAlpha(ida, SkGetPackedB32(src)) + |
| 430 | SkAlphaMulAlpha(isa, SkGetPackedB32(dst))); |
| 431 | } |
| 432 | |
| 433 | |
| 434 | // kDarken_Mode, [Sa + Da - Sa·Da, Sc·(1 - Da) + Dc·(1 - Sa) + min(Sc, Dc)] |
| 435 | |
| 436 | static inline unsigned darken_p(unsigned src, unsigned dst, |
| 437 | unsigned src_mul, unsigned dst_mul) { |
| 438 | return ((dst_mul * src + src_mul * dst) >> 8) + SkMin32(src, dst); |
| 439 | } |
| 440 | |
| 441 | static SkPMColor darken_modeproc(SkPMColor src, SkPMColor dst) { |
| 442 | unsigned sa = SkGetPackedA32(src); |
| 443 | unsigned da = SkGetPackedA32(dst); |
| 444 | unsigned src_scale = SkAlpha255To256(255 - sa); |
| 445 | unsigned dst_scale = SkAlpha255To256(255 - da); |
| 446 | |
| 447 | unsigned ra = sa + da - SkAlphaMulAlpha(sa, da); |
| 448 | unsigned rr = darken_p(SkGetPackedR32(src), SkGetPackedR32(dst), |
| 449 | src_scale, dst_scale); |
| 450 | unsigned rg = darken_p(SkGetPackedG32(src), SkGetPackedG32(dst), |
| 451 | src_scale, dst_scale); |
| 452 | unsigned rb = darken_p(SkGetPackedB32(src), SkGetPackedB32(dst), |
| 453 | src_scale, dst_scale); |
| 454 | |
| 455 | return SkPackARGB32(ra, SkFastMin32(rr, ra), |
| 456 | SkFastMin32(rg, ra), SkFastMin32(rb, ra)); |
| 457 | } |
| 458 | |
| 459 | // kLighten_Mode, [Sa + Da - Sa·Da, Sc·(1 - Da) + Dc·(1 - Sa) + max(Sc, Dc)] |
| 460 | static inline unsigned lighten_p(unsigned src, unsigned dst, |
| 461 | unsigned src_mul, unsigned dst_mul) { |
| 462 | return ((dst_mul * src + src_mul * dst) >> 8) + SkMax32(src, dst); |
| 463 | } |
| 464 | |
| 465 | static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) { |
| 466 | unsigned sa = SkGetPackedA32(src); |
| 467 | unsigned da = SkGetPackedA32(dst); |
| 468 | unsigned src_scale = SkAlpha255To256(255 - sa); |
| 469 | unsigned dst_scale = SkAlpha255To256(255 - da); |
| 470 | |
| 471 | unsigned ra = sa + da - SkAlphaMulAlpha(sa, da); |
| 472 | unsigned rr = lighten_p(SkGetPackedR32(src), SkGetPackedR32(dst), |
| 473 | src_scale, dst_scale); |
| 474 | unsigned rg = lighten_p(SkGetPackedG32(src), SkGetPackedG32(dst), |
| 475 | src_scale, dst_scale); |
| 476 | unsigned rb = lighten_p(SkGetPackedB32(src), SkGetPackedB32(dst), |
| 477 | src_scale, dst_scale); |
| 478 | |
| 479 | return SkPackARGB32(ra, SkFastMin32(rr, ra), |
| 480 | SkFastMin32(rg, ra), SkFastMin32(rb, ra)); |
| 481 | } |
| 482 | |
| 483 | static SkPMColor mult_modeproc(SkPMColor src, SkPMColor dst) { |
| 484 | int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst)); |
| 485 | int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst)); |
| 486 | int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst)); |
| 487 | int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst)); |
| 488 | return SkPackARGB32(a, r, g, b); |
| 489 | } |
| 490 | |
| 491 | static inline int screen_byte(int a, int b) { |
| 492 | return a + b - SkAlphaMulAlpha(a, b); |
| 493 | } |
| 494 | |
| 495 | static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) { |
| 496 | int a = screen_byte(SkGetPackedA32(src), SkGetPackedA32(dst)); |
| 497 | int r = screen_byte(SkGetPackedR32(src), SkGetPackedR32(dst)); |
| 498 | int g = screen_byte(SkGetPackedG32(src), SkGetPackedG32(dst)); |
| 499 | int b = screen_byte(SkGetPackedB32(src), SkGetPackedB32(dst)); |
| 500 | return SkPackARGB32(a, r, g, b); |
| 501 | } |
| 502 | |
| 503 | /////////////////////////////////////////////////////////////////////////////// |
| 504 | |
| 505 | class SkClearXfermode : public SkProcCoeffXfermode { |
| 506 | public: |
| 507 | SkClearXfermode() : SkProcCoeffXfermode(clear_modeproc, |
| 508 | kZero_Coeff, kZero_Coeff) {} |
| 509 | |
| 510 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 511 | const SK_RESTRICT SkPMColor[], int count, |
| 512 | const SK_RESTRICT SkAlpha aa[]) { |
| 513 | SkASSERT(dst && count >= 0); |
| 514 | |
| 515 | if (NULL == aa) { |
| 516 | memset(dst, 0, count << 2); |
| 517 | } else { |
| 518 | for (int i = count - 1; i >= 0; --i) { |
| 519 | unsigned a = aa[i]; |
| 520 | if (0xFF == a) { |
| 521 | dst[i] = 0; |
| 522 | } else if (a != 0) { |
| 523 | dst[i] = SkAlphaMulQ(dst[i], SkAlpha255To256(255 - a)); |
| 524 | } |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | virtual void xferA8(SK_RESTRICT SkAlpha dst[], |
| 529 | const SK_RESTRICT SkPMColor[], int count, |
| 530 | const SK_RESTRICT SkAlpha aa[]) { |
| 531 | SkASSERT(dst && count >= 0); |
| 532 | |
| 533 | if (NULL == aa) { |
| 534 | memset(dst, 0, count); |
| 535 | } else { |
| 536 | for (int i = count - 1; i >= 0; --i) { |
| 537 | unsigned a = aa[i]; |
| 538 | if (0xFF == a) { |
| 539 | dst[i] = 0; |
| 540 | } else if (0 != a) { |
| 541 | dst[i] = SkAlphaMulAlpha(dst[i], 255 - a); |
| 542 | } |
| 543 | } |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | virtual Factory getFactory() { return CreateProc; } |
| 548 | |
| 549 | private: |
| 550 | SkClearXfermode(SkFlattenableReadBuffer& buffer) |
| 551 | : SkProcCoeffXfermode(buffer) {} |
| 552 | |
| 553 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 554 | return SkNEW_ARGS(SkClearXfermode, (buffer)); |
| 555 | } |
| 556 | }; |
| 557 | |
| 558 | /////////////////////////////////////////////////////////////////////////////// |
| 559 | |
| 560 | class SkSrcXfermode : public SkProcCoeffXfermode { |
| 561 | public: |
| 562 | SkSrcXfermode() : SkProcCoeffXfermode(src_modeproc, |
| 563 | kOne_Coeff, kZero_Coeff) {} |
| 564 | |
| 565 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 566 | const SK_RESTRICT SkPMColor src[], int count, |
| 567 | const SK_RESTRICT SkAlpha aa[]) { |
| 568 | SkASSERT(dst && src && count >= 0); |
| 569 | |
| 570 | if (NULL == aa) { |
| 571 | memcpy(dst, src, count << 2); |
| 572 | } else { |
| 573 | for (int i = count - 1; i >= 0; --i) { |
| 574 | unsigned a = aa[i]; |
| 575 | if (a == 0xFF) { |
| 576 | dst[i] = src[i]; |
| 577 | } else if (a != 0) { |
| 578 | dst[i] = SkFourByteInterp(src[i], dst[i], a); |
| 579 | } |
| 580 | } |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | virtual void xferA8(SK_RESTRICT SkAlpha dst[], |
| 585 | const SK_RESTRICT SkPMColor src[], int count, |
| 586 | const SK_RESTRICT SkAlpha aa[]) { |
| 587 | SkASSERT(dst && src && count >= 0); |
| 588 | |
| 589 | if (NULL == aa) { |
| 590 | for (int i = count - 1; i >= 0; --i) { |
| 591 | dst[i] = SkToU8(SkGetPackedA32(src[i])); |
| 592 | } |
| 593 | } else { |
| 594 | for (int i = count - 1; i >= 0; --i) { |
| 595 | unsigned a = aa[i]; |
| 596 | if (0 != a) { |
| 597 | unsigned srcA = SkGetPackedA32(src[i]); |
| 598 | if (a == 0xFF) { |
| 599 | dst[i] = SkToU8(srcA); |
| 600 | } else { |
| 601 | dst[i] = SkToU8(SkAlphaBlend(srcA, dst[i], a)); |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | virtual Factory getFactory() { return CreateProc; } |
| 609 | |
| 610 | private: |
| 611 | SkSrcXfermode(SkFlattenableReadBuffer& buffer) |
| 612 | : SkProcCoeffXfermode(buffer) {} |
| 613 | |
| 614 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 615 | return SkNEW_ARGS(SkSrcXfermode, (buffer)); |
| 616 | } |
| 617 | }; |
| 618 | |
| 619 | class SkDstInXfermode : public SkProcCoeffXfermode { |
| 620 | public: |
| 621 | SkDstInXfermode() : SkProcCoeffXfermode(dstin_modeproc, |
| 622 | kZero_Coeff, kSA_Coeff) {} |
| 623 | |
| 624 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 625 | const SK_RESTRICT SkPMColor src[], int count, |
| 626 | const SK_RESTRICT SkAlpha aa[]) { |
| 627 | SkASSERT(dst && src); |
| 628 | |
| 629 | if (count <= 0) { |
| 630 | return; |
| 631 | } |
| 632 | if (NULL != aa) { |
| 633 | return this->INHERITED::xfer32(dst, src, count, aa); |
| 634 | } |
| 635 | |
| 636 | do { |
| 637 | unsigned a = SkGetPackedA32(*src); |
| 638 | *dst = SkAlphaMulQ(*dst, SkAlpha255To256(a)); |
| 639 | dst++; |
| 640 | src++; |
| 641 | } while (--count != 0); |
| 642 | } |
| 643 | |
| 644 | virtual Factory getFactory() { return CreateProc; } |
| 645 | |
| 646 | private: |
| 647 | SkDstInXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {} |
| 648 | |
| 649 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 650 | return SkNEW_ARGS(SkDstInXfermode, (buffer)); |
| 651 | } |
| 652 | |
| 653 | typedef SkProcCoeffXfermode INHERITED; |
| 654 | }; |
| 655 | |
| 656 | class SkDstOutXfermode : public SkProcCoeffXfermode { |
| 657 | public: |
| 658 | SkDstOutXfermode() : SkProcCoeffXfermode(dstout_modeproc, |
| 659 | kZero_Coeff, kISA_Coeff) {} |
| 660 | |
| 661 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 662 | const SK_RESTRICT SkPMColor src[], int count, |
| 663 | const SK_RESTRICT SkAlpha aa[]) { |
| 664 | SkASSERT(dst && src); |
| 665 | |
| 666 | if (count <= 0) { |
| 667 | return; |
| 668 | } |
| 669 | if (NULL != aa) { |
| 670 | return this->INHERITED::xfer32(dst, src, count, aa); |
| 671 | } |
| 672 | |
| 673 | do { |
| 674 | unsigned a = SkGetPackedA32(*src); |
| 675 | *dst = SkAlphaMulQ(*dst, SkAlpha255To256(255 - a)); |
| 676 | dst++; |
| 677 | src++; |
| 678 | } while (--count != 0); |
| 679 | } |
| 680 | |
| 681 | virtual Factory getFactory() { return CreateProc; } |
| 682 | |
| 683 | private: |
| 684 | SkDstOutXfermode(SkFlattenableReadBuffer& buffer) |
| 685 | : INHERITED(buffer) {} |
| 686 | |
| 687 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 688 | return SkNEW_ARGS(SkDstOutXfermode, (buffer)); |
| 689 | } |
| 690 | |
| 691 | typedef SkProcCoeffXfermode INHERITED; |
| 692 | }; |
| 693 | |
| 694 | /////////////////////////////////////////////////////////////////////////////// |
| 695 | |
| 696 | #include "SkPorterDuff.h" |
| 697 | |
| 698 | struct ProcCoeff { |
| 699 | SkXfermodeProc fProc; |
| 700 | SkXfermode::Coeff fSC; |
| 701 | SkXfermode::Coeff fDC; |
| 702 | }; |
| 703 | |
| 704 | static const ProcCoeff gProcCoeffs[] = { |
| 705 | { clear_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kZero_Coeff }, |
| 706 | { src_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kZero_Coeff }, |
| 707 | { dst_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kOne_Coeff }, |
| 708 | { srcover_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISA_Coeff }, |
| 709 | { dstover_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kOne_Coeff }, |
| 710 | { srcin_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kZero_Coeff }, |
| 711 | { dstin_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kSA_Coeff }, |
| 712 | { srcout_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kZero_Coeff }, |
| 713 | { dstout_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kISA_Coeff }, |
| 714 | { srcatop_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kISA_Coeff }, |
| 715 | { dstatop_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kSA_Coeff }, |
| 716 | { xor_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kISA_Coeff }, |
| 717 | // these two can't be represented as coefficients |
| 718 | { darken_modeproc, SkXfermode::Coeff(-1), SkXfermode::Coeff(-1) }, |
| 719 | { lighten_modeproc, SkXfermode::Coeff(-1), SkXfermode::Coeff(-1) }, |
| 720 | // these can use coefficients |
| 721 | { mult_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kSC_Coeff }, |
| 722 | { screen_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISC_Coeff } |
| 723 | }; |
| 724 | |
| 725 | SkXfermode* SkPorterDuff::CreateXfermode(SkPorterDuff::Mode mode) { |
| 726 | SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == SkPorterDuff::kModeCount); |
| 727 | SkASSERT((unsigned)mode < SkPorterDuff::kModeCount); |
| 728 | |
| 729 | switch (mode) { |
| 730 | case kClear_Mode: |
| 731 | return SkNEW(SkClearXfermode); |
| 732 | case kSrc_Mode: |
| 733 | return SkNEW(SkSrcXfermode); |
| 734 | case kSrcOver_Mode: |
| 735 | return NULL; |
| 736 | case kDstIn_Mode: |
| 737 | return SkNEW(SkDstInXfermode); |
| 738 | case kDstOut_Mode: |
| 739 | return SkNEW(SkDstOutXfermode); |
| 740 | // these two can't be represented with Coeff |
| 741 | case kDarken_Mode: |
| 742 | return SkNEW_ARGS(SkProcXfermode, (darken_modeproc)); |
| 743 | case kLighten_Mode: |
| 744 | return SkNEW_ARGS(SkProcXfermode, (lighten_modeproc)); |
| 745 | // use the table |
| 746 | default: { |
| 747 | const ProcCoeff& rec = gProcCoeffs[mode]; |
| 748 | SkASSERT((unsigned)rec.fSC < SkXfermode::kCoeffCount); |
| 749 | SkASSERT((unsigned)rec.fDC < SkXfermode::kCoeffCount); |
| 750 | return SkNEW_ARGS(SkProcCoeffXfermode, (rec.fProc, |
| 751 | rec.fSC, rec.fDC)); |
| 752 | } |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | bool SkPorterDuff::IsMode(SkXfermode* xfer, Mode* mode) { |
| 757 | if (NULL == xfer) { |
| 758 | if (mode) { |
| 759 | *mode = kSrcOver_Mode; |
| 760 | } |
| 761 | return true; |
| 762 | } |
| 763 | |
| 764 | SkXfermode::Coeff sc, dc; |
| 765 | if (xfer->asCoeff(&sc, &dc)) { |
| 766 | SkASSERT((unsigned)sc < (unsigned)SkXfermode::kCoeffCount); |
| 767 | SkASSERT((unsigned)dc < (unsigned)SkXfermode::kCoeffCount); |
| 768 | |
| 769 | const ProcCoeff* rec = gProcCoeffs; |
| 770 | for (size_t i = 0; i < SK_ARRAY_COUNT(gProcCoeffs); i++) { |
| 771 | if (rec[i].fSC == sc && rec[i].fDC == dc) { |
| 772 | if (mode) { |
| 773 | *mode = SkPorterDuff::Mode(i); |
| 774 | } |
| 775 | return true; |
| 776 | } |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | // no coefficients, or not found in our table |
| 781 | return false; |
| 782 | } |
| 783 | |
| 784 | /////////////////////////////////////////////////////////////////////////////// |
| 785 | |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 786 | #ifdef SK_DEBUGx |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 787 | static void unit_test() { |
| 788 | for (unsigned a = 0; a <= 255; a++) { |
| 789 | for (unsigned c = 0; c <= a; c++) { |
| 790 | SkPMColor pm = SkPackARGB32(a, c, c, c); |
| 791 | for (unsigned aa = 0; aa <= 255; aa++) { |
| 792 | for (unsigned cc = 0; cc <= aa; cc++) { |
| 793 | SkPMColor pm2 = SkPackARGB32(aa, cc, cc, cc); |
| 794 | |
| 795 | const size_t N = SK_ARRAY_COUNT(gProcCoeffs); |
| 796 | for (size_t i = 0; i < N; i++) { |
| 797 | gProcCoeffs[i].fProc(pm, pm2); |
| 798 | } |
| 799 | } |
| 800 | } |
| 801 | } |
| 802 | } |
| 803 | } |
| 804 | #endif |
| 805 | |
| 806 | SkXfermodeProc SkPorterDuff::GetXfermodeProc(Mode mode) { |
| 807 | #ifdef SK_DEBUGx |
| 808 | static bool gUnitTest; |
| 809 | if (!gUnitTest) { |
| 810 | gUnitTest = true; |
| 811 | unit_test(); |
| 812 | } |
| 813 | #endif |
| 814 | |
| 815 | SkXfermodeProc proc = NULL; |
| 816 | |
| 817 | if ((unsigned)mode < SkPorterDuff::kModeCount) { |
| 818 | proc = gProcCoeffs[mode].fProc; |
| 819 | } |
| 820 | return proc; |
| 821 | } |
| 822 | |
| 823 | /////////////////////////////////////////////////////////////////////////////// |
| 824 | //////////// 16bit xfermode procs |
| 825 | |
| 826 | #ifdef SK_DEBUG |
| 827 | static bool require_255(SkPMColor src) { return SkGetPackedA32(src) == 0xFF; } |
| 828 | static bool require_0(SkPMColor src) { return SkGetPackedA32(src) == 0; } |
| 829 | #endif |
| 830 | |
| 831 | static uint16_t src_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 832 | SkASSERT(require_255(src)); |
| 833 | return SkPixel32ToPixel16(src); |
| 834 | } |
| 835 | |
| 836 | static uint16_t dst_modeproc16(SkPMColor src, uint16_t dst) { |
| 837 | return dst; |
| 838 | } |
| 839 | |
| 840 | static uint16_t srcover_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 841 | SkASSERT(require_0(src)); |
| 842 | return dst; |
| 843 | } |
| 844 | |
| 845 | static uint16_t srcover_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 846 | SkASSERT(require_255(src)); |
| 847 | return SkPixel32ToPixel16(src); |
| 848 | } |
| 849 | |
| 850 | static uint16_t dstover_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 851 | SkASSERT(require_0(src)); |
| 852 | return dst; |
| 853 | } |
| 854 | |
| 855 | static uint16_t dstover_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 856 | SkASSERT(require_255(src)); |
| 857 | return dst; |
| 858 | } |
| 859 | |
| 860 | static uint16_t srcin_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 861 | SkASSERT(require_255(src)); |
| 862 | return SkPixel32ToPixel16(src); |
| 863 | } |
| 864 | |
| 865 | static uint16_t dstin_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 866 | SkASSERT(require_255(src)); |
| 867 | return dst; |
| 868 | } |
| 869 | |
| 870 | static uint16_t dstout_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 871 | SkASSERT(require_0(src)); |
| 872 | return dst; |
| 873 | } |
| 874 | |
| 875 | static uint16_t srcatop_modeproc16(SkPMColor src, uint16_t dst) { |
| 876 | unsigned isa = 255 - SkGetPackedA32(src); |
| 877 | |
| 878 | return SkPackRGB16( |
| 879 | SkPacked32ToR16(src) + SkAlphaMulAlpha(SkGetPackedR16(dst), isa), |
| 880 | SkPacked32ToG16(src) + SkAlphaMulAlpha(SkGetPackedG16(dst), isa), |
| 881 | SkPacked32ToB16(src) + SkAlphaMulAlpha(SkGetPackedB16(dst), isa)); |
| 882 | } |
| 883 | |
| 884 | static uint16_t srcatop_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 885 | SkASSERT(require_0(src)); |
| 886 | return dst; |
| 887 | } |
| 888 | |
| 889 | static uint16_t srcatop_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 890 | SkASSERT(require_255(src)); |
| 891 | return SkPixel32ToPixel16(src); |
| 892 | } |
| 893 | |
| 894 | static uint16_t dstatop_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 895 | SkASSERT(require_255(src)); |
| 896 | return dst; |
| 897 | } |
| 898 | |
| 899 | /********* |
| 900 | darken and lighten boil down to this. |
| 901 | |
| 902 | darken = (1 - Sa) * Dc + min(Sc, Dc) |
| 903 | lighten = (1 - Sa) * Dc + max(Sc, Dc) |
| 904 | |
| 905 | if (Sa == 0) these become |
| 906 | darken = Dc + min(0, Dc) = 0 |
| 907 | lighten = Dc + max(0, Dc) = Dc |
| 908 | |
| 909 | if (Sa == 1) these become |
| 910 | darken = min(Sc, Dc) |
| 911 | lighten = max(Sc, Dc) |
| 912 | */ |
| 913 | |
| 914 | static uint16_t darken_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 915 | SkASSERT(require_0(src)); |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | static uint16_t darken_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 920 | SkASSERT(require_255(src)); |
| 921 | unsigned r = SkFastMin32(SkPacked32ToR16(src), SkGetPackedR16(dst)); |
| 922 | unsigned g = SkFastMin32(SkPacked32ToG16(src), SkGetPackedG16(dst)); |
| 923 | unsigned b = SkFastMin32(SkPacked32ToB16(src), SkGetPackedB16(dst)); |
| 924 | return SkPackRGB16(r, g, b); |
| 925 | } |
| 926 | |
| 927 | static uint16_t lighten_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 928 | SkASSERT(require_0(src)); |
| 929 | return dst; |
| 930 | } |
| 931 | |
| 932 | static uint16_t lighten_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 933 | SkASSERT(require_255(src)); |
| 934 | unsigned r = SkMax32(SkPacked32ToR16(src), SkGetPackedR16(dst)); |
| 935 | unsigned g = SkMax32(SkPacked32ToG16(src), SkGetPackedG16(dst)); |
| 936 | unsigned b = SkMax32(SkPacked32ToB16(src), SkGetPackedB16(dst)); |
| 937 | return SkPackRGB16(r, g, b); |
| 938 | } |
| 939 | |
| 940 | struct Proc16Rec { |
| 941 | SkXfermodeProc16 fProc16_0; |
| 942 | SkXfermodeProc16 fProc16_255; |
| 943 | SkXfermodeProc16 fProc16_General; |
| 944 | }; |
| 945 | |
| 946 | static const Proc16Rec gPorterDuffModeProcs16[] = { |
| 947 | { NULL, NULL, NULL }, // CLEAR |
| 948 | { NULL, src_modeproc16_255, NULL }, |
| 949 | { dst_modeproc16, dst_modeproc16, dst_modeproc16 }, |
| 950 | { srcover_modeproc16_0, srcover_modeproc16_255, NULL }, |
| 951 | { dstover_modeproc16_0, dstover_modeproc16_255, NULL }, |
| 952 | { NULL, srcin_modeproc16_255, NULL }, |
| 953 | { NULL, dstin_modeproc16_255, NULL }, |
| 954 | { NULL, NULL, NULL },// SRC_OUT |
| 955 | { dstout_modeproc16_0, NULL, NULL }, |
| 956 | { srcatop_modeproc16_0, srcatop_modeproc16_255, srcatop_modeproc16 }, |
| 957 | { NULL, dstatop_modeproc16_255, NULL }, |
| 958 | { NULL, NULL, NULL }, // XOR |
| 959 | { darken_modeproc16_0, darken_modeproc16_255, NULL }, |
| 960 | { lighten_modeproc16_0, lighten_modeproc16_255, NULL }, |
| 961 | { NULL, NULL, NULL },//multiply |
| 962 | { NULL, NULL, NULL }// screen |
| 963 | }; |
| 964 | |
| 965 | SkXfermodeProc16 SkPorterDuff::GetXfermodeProc16(Mode mode, SkColor srcColor) { |
| 966 | SkXfermodeProc16 proc16 = NULL; |
| 967 | |
| 968 | if ((unsigned)mode < SkPorterDuff::kModeCount) { |
| 969 | const Proc16Rec& rec = gPorterDuffModeProcs16[mode]; |
| 970 | |
| 971 | unsigned a = SkColorGetA(srcColor); |
| 972 | |
| 973 | if (0 == a) { |
| 974 | proc16 = rec.fProc16_0; |
| 975 | } else if (255 == a) { |
| 976 | proc16 = rec.fProc16_255; |
| 977 | } else { |
| 978 | proc16 = rec.fProc16_General; |
| 979 | } |
| 980 | } |
| 981 | return proc16; |
| 982 | } |
| 983 | |