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| 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 | |
| 9 #include "GrStencil.h" | |
| 10 | |
| 11 #include "GrProcessor.h" | |
| 12 | |
| 13 //////////////////////////////////////////////////////////////////////////////// | |
| 14 // Stencil Rules for Merging user stencil space into clip | |
| 15 | |
| 16 // We can't include the clip bit in the ref or mask values because the division | |
| 17 // between user and clip bits in the stencil depends on the number of stencil | |
| 18 // bits in the runtime. Comments below indicate what the code should do to | |
| 19 // incorporate the clip bit into these settings. | |
| 20 | |
| 21 /////// | |
| 22 // Replace | |
| 23 | |
| 24 // set the ref to be the clip bit, but mask it out for the test | |
| 25 static constexpr GrStencilSettings gUserToClipReplace( | |
| 26 kReplace_StencilOp, | |
| 27 kZero_StencilOp, | |
| 28 kLess_StencilFunc, | |
| 29 0xffff, // unset clip bit | |
| 30 0x0000, // set clip bit | |
| 31 0xffff); | |
| 32 | |
| 33 static constexpr GrStencilSettings gInvUserToClipReplace( | |
| 34 kReplace_StencilOp, | |
| 35 kZero_StencilOp, | |
| 36 kEqual_StencilFunc, | |
| 37 0xffff, // unset clip bit | |
| 38 0x0000, // set clip bit | |
| 39 0xffff); | |
| 40 | |
| 41 /////// | |
| 42 // Intersect | |
| 43 static constexpr GrStencilSettings gUserToClipIsect( | |
| 44 kReplace_StencilOp, | |
| 45 kZero_StencilOp, | |
| 46 kLess_StencilFunc, | |
| 47 0xffff, | |
| 48 0x0000, // set clip bit | |
| 49 0xffff); | |
| 50 | |
| 51 static constexpr GrStencilSettings gInvUserToClipIsect( | |
| 52 kReplace_StencilOp, | |
| 53 kZero_StencilOp, | |
| 54 kEqual_StencilFunc, | |
| 55 0xffff, | |
| 56 0x0000, // set clip bit | |
| 57 0xffff); | |
| 58 | |
| 59 /////// | |
| 60 // Difference | |
| 61 static constexpr GrStencilSettings gUserToClipDiff( | |
| 62 kReplace_StencilOp, | |
| 63 kZero_StencilOp, | |
| 64 kEqual_StencilFunc, | |
| 65 0xffff, | |
| 66 0x0000, // set clip bit | |
| 67 0xffff); | |
| 68 | |
| 69 static constexpr GrStencilSettings gInvUserToClipDiff( | |
| 70 kReplace_StencilOp, | |
| 71 kZero_StencilOp, | |
| 72 kLess_StencilFunc, | |
| 73 0xffff, | |
| 74 0x0000, // set clip bit | |
| 75 0xffff); | |
| 76 | |
| 77 /////// | |
| 78 // Union | |
| 79 | |
| 80 // first pass makes all the passing cases >= just clip bit set. | |
| 81 static constexpr GrStencilSettings gUserToClipUnionPass0( | |
| 82 kReplace_StencilOp, | |
| 83 kKeep_StencilOp, | |
| 84 kLEqual_StencilFunc, | |
| 85 0xffff, | |
| 86 0x0001, // set clip bit | |
| 87 0xffff); | |
| 88 | |
| 89 // second pass allows anything greater than just clip bit set to pass | |
| 90 static constexpr GrStencilSettings gUserToClipUnionPass1( | |
| 91 kReplace_StencilOp, | |
| 92 kZero_StencilOp, | |
| 93 kLEqual_StencilFunc, | |
| 94 0xffff, | |
| 95 0x0000, // set clip bit | |
| 96 0xffff); | |
| 97 | |
| 98 // first pass finds zeros in the user bits and if found sets | |
| 99 // the clip bit to 1 | |
| 100 static constexpr GrStencilSettings gInvUserToClipUnionPass0( | |
| 101 kReplace_StencilOp, | |
| 102 kKeep_StencilOp, | |
| 103 kEqual_StencilFunc, | |
| 104 0xffff, | |
| 105 0x0000, // set clip bit | |
| 106 0x0000 // set clip bit | |
| 107 ); | |
| 108 | |
| 109 // second pass zeros the user bits | |
| 110 static constexpr GrStencilSettings gInvUserToClipUnionPass1( | |
| 111 kZero_StencilOp, | |
| 112 kZero_StencilOp, | |
| 113 kLess_StencilFunc, | |
| 114 0xffff, | |
| 115 0x0000, | |
| 116 0xffff // unset clip bit | |
| 117 ); | |
| 118 | |
| 119 /////// | |
| 120 // Xor | |
| 121 static constexpr GrStencilSettings gUserToClipXorPass0( | |
| 122 kInvert_StencilOp, | |
| 123 kKeep_StencilOp, | |
| 124 kEqual_StencilFunc, | |
| 125 0xffff, // unset clip bit | |
| 126 0x0000, | |
| 127 0xffff); | |
| 128 | |
| 129 static constexpr GrStencilSettings gUserToClipXorPass1( | |
| 130 kReplace_StencilOp, | |
| 131 kZero_StencilOp, | |
| 132 kGreater_StencilFunc, | |
| 133 0xffff, | |
| 134 0x0000, // set clip bit | |
| 135 0xffff); | |
| 136 | |
| 137 static constexpr GrStencilSettings gInvUserToClipXorPass0( | |
| 138 kInvert_StencilOp, | |
| 139 kKeep_StencilOp, | |
| 140 kEqual_StencilFunc, | |
| 141 0xffff, // unset clip bit | |
| 142 0x0000, | |
| 143 0xffff); | |
| 144 | |
| 145 static constexpr GrStencilSettings gInvUserToClipXorPass1( | |
| 146 kReplace_StencilOp, | |
| 147 kZero_StencilOp, | |
| 148 kLess_StencilFunc, | |
| 149 0xffff, | |
| 150 0x0000, // set clip bit | |
| 151 0xffff); | |
| 152 | |
| 153 /////// | |
| 154 // Reverse Diff | |
| 155 static constexpr GrStencilSettings gUserToClipRDiffPass0( | |
| 156 kInvert_StencilOp, | |
| 157 kZero_StencilOp, | |
| 158 kLess_StencilFunc, | |
| 159 0xffff, // unset clip bit | |
| 160 0x0000, // set clip bit | |
| 161 0xffff); | |
| 162 | |
| 163 static constexpr GrStencilSettings gUserToClipRDiffPass1( | |
| 164 kReplace_StencilOp, | |
| 165 kZero_StencilOp, | |
| 166 kEqual_StencilFunc, | |
| 167 0x0000, // set clip bit | |
| 168 0x0000, // set clip bit | |
| 169 0xffff); | |
| 170 | |
| 171 // We are looking for stencil values that are all zero. The first pass sets the | |
| 172 // clip bit if the stencil is all zeros. The second pass clears the user bits. | |
| 173 static constexpr GrStencilSettings gInvUserToClipRDiffPass0( | |
| 174 kInvert_StencilOp, | |
| 175 kZero_StencilOp, | |
| 176 kEqual_StencilFunc, | |
| 177 0xffff, | |
| 178 0x0000, | |
| 179 0x0000 // set clip bit | |
| 180 ); | |
| 181 | |
| 182 static constexpr GrStencilSettings gInvUserToClipRDiffPass1( | |
| 183 kZero_StencilOp, | |
| 184 kZero_StencilOp, | |
| 185 kAlways_StencilFunc, | |
| 186 0xffff, | |
| 187 0x0000, | |
| 188 0xffff // unset clip bit | |
| 189 ); | |
| 190 | |
| 191 /////// | |
| 192 // Direct to Stencil | |
| 193 | |
| 194 // We can render a clip element directly without first writing to the client | |
| 195 // portion of the clip when the fill is not inverse and the set operation will | |
| 196 // only modify the in/out status of samples covered by the clip element. | |
| 197 | |
| 198 // this one only works if used right after stencil clip was cleared. | |
| 199 // Our clip mask creation code doesn't allow midstream replace ops. | |
| 200 static constexpr GrStencilSettings gReplaceClip( | |
| 201 kReplace_StencilOp, | |
| 202 kReplace_StencilOp, | |
| 203 kAlways_StencilFunc, | |
| 204 0xffff, | |
| 205 0x0000, // set clip bit | |
| 206 0x0000 // set clipBit | |
| 207 ); | |
| 208 | |
| 209 static constexpr GrStencilSettings gUnionClip( | |
| 210 kReplace_StencilOp, | |
| 211 kReplace_StencilOp, | |
| 212 kAlways_StencilFunc, | |
| 213 0xffff, | |
| 214 0x0000, // set clip bit | |
| 215 0x0000 // set clip bit | |
| 216 ); | |
| 217 | |
| 218 static constexpr GrStencilSettings gXorClip( | |
| 219 kInvert_StencilOp, | |
| 220 kInvert_StencilOp, | |
| 221 kAlways_StencilFunc, | |
| 222 0xffff, | |
| 223 0x0000, | |
| 224 0x0000 // set clip bit | |
| 225 ); | |
| 226 | |
| 227 static constexpr GrStencilSettings gDiffClip( | |
| 228 kZero_StencilOp, | |
| 229 kZero_StencilOp, | |
| 230 kAlways_StencilFunc, | |
| 231 0xffff, | |
| 232 0x0000, | |
| 233 0x0000 // set clip bit | |
| 234 ); | |
| 235 | |
| 236 bool GrStencilSettings::GetClipPasses( | |
| 237 SkRegion::Op op, | |
| 238 bool canBeDirect, | |
| 239 unsigned int stencilClipMask, | |
| 240 bool invertedFill, | |
| 241 int* numPasses, | |
| 242 GrStencilSettings settings[kMaxStencilClipPasses]) { | |
| 243 if (canBeDirect && !invertedFill) { | |
| 244 *numPasses = 0; | |
| 245 switch (op) { | |
| 246 case SkRegion::kReplace_Op: | |
| 247 *numPasses = 1; | |
| 248 settings[0] = gReplaceClip; | |
| 249 break; | |
| 250 case SkRegion::kUnion_Op: | |
| 251 *numPasses = 1; | |
| 252 settings[0] = gUnionClip; | |
| 253 break; | |
| 254 case SkRegion::kXOR_Op: | |
| 255 *numPasses = 1; | |
| 256 settings[0] = gXorClip; | |
| 257 break; | |
| 258 case SkRegion::kDifference_Op: | |
| 259 *numPasses = 1; | |
| 260 settings[0] = gDiffClip; | |
| 261 break; | |
| 262 default: // suppress warning | |
| 263 break; | |
| 264 } | |
| 265 if (1 == *numPasses) { | |
| 266 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 267 settings[0].fWriteMasks[kFront_Face] |= stencilClipMask; | |
| 268 settings[0].fFuncRefs[kBack_Face] = | |
| 269 settings[0].fFuncRefs[kFront_Face]; | |
| 270 settings[0].fWriteMasks[kBack_Face] = | |
| 271 settings[0].fWriteMasks[kFront_Face]; | |
| 272 return true; | |
| 273 } | |
| 274 } | |
| 275 switch (op) { | |
| 276 // if we make the path renderer go to stencil we always give it a | |
| 277 // non-inverted fill and we use the stencil rules on the client->clipbit | |
| 278 // pass to select either the zeros or nonzeros. | |
| 279 case SkRegion::kReplace_Op: | |
| 280 *numPasses= 1; | |
| 281 settings[0] = invertedFill ? gInvUserToClipReplace : | |
| 282 gUserToClipReplace; | |
| 283 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 284 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 285 settings[0].fFuncMasks[kBack_Face] = | |
| 286 settings[0].fFuncMasks[kFront_Face]; | |
| 287 settings[0].fFuncRefs[kBack_Face] = | |
| 288 settings[0].fFuncRefs[kFront_Face]; | |
| 289 break; | |
| 290 case SkRegion::kIntersect_Op: | |
| 291 *numPasses = 1; | |
| 292 settings[0] = invertedFill ? gInvUserToClipIsect : gUserToClipIsect; | |
| 293 settings[0].fFuncRefs[kFront_Face] = stencilClipMask; | |
| 294 settings[0].fFuncRefs[kBack_Face] = | |
| 295 settings[0].fFuncRefs[kFront_Face]; | |
| 296 break; | |
| 297 case SkRegion::kUnion_Op: | |
| 298 *numPasses = 2; | |
| 299 if (invertedFill) { | |
| 300 settings[0] = gInvUserToClipUnionPass0; | |
| 301 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 302 settings[0].fFuncMasks[kBack_Face] = | |
| 303 settings[0].fFuncMasks[kFront_Face]; | |
| 304 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 305 settings[0].fFuncRefs[kBack_Face] = | |
| 306 settings[0].fFuncRefs[kFront_Face]; | |
| 307 settings[0].fWriteMasks[kFront_Face] |= stencilClipMask; | |
| 308 settings[0].fWriteMasks[kBack_Face] = | |
| 309 settings[0].fWriteMasks[kFront_Face]; | |
| 310 | |
| 311 settings[1] = gInvUserToClipUnionPass1; | |
| 312 settings[1].fWriteMasks[kFront_Face] &= ~stencilClipMask; | |
| 313 settings[1].fWriteMasks[kBack_Face] &= | |
| 314 settings[1].fWriteMasks[kFront_Face]; | |
| 315 | |
| 316 } else { | |
| 317 settings[0] = gUserToClipUnionPass0; | |
| 318 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 319 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 320 settings[0].fFuncMasks[kBack_Face] = | |
| 321 settings[0].fFuncMasks[kFront_Face]; | |
| 322 settings[0].fFuncRefs[kBack_Face] = | |
| 323 settings[0].fFuncRefs[kFront_Face]; | |
| 324 | |
| 325 settings[1] = gUserToClipUnionPass1; | |
| 326 settings[1].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 327 settings[1].fFuncRefs[kBack_Face] = | |
| 328 settings[1].fFuncRefs[kFront_Face]; | |
| 329 } | |
| 330 break; | |
| 331 case SkRegion::kXOR_Op: | |
| 332 *numPasses = 2; | |
| 333 if (invertedFill) { | |
| 334 settings[0] = gInvUserToClipXorPass0; | |
| 335 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 336 settings[0].fFuncMasks[kBack_Face] = | |
| 337 settings[0].fFuncMasks[kFront_Face]; | |
| 338 | |
| 339 settings[1] = gInvUserToClipXorPass1; | |
| 340 settings[1].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 341 settings[1].fFuncRefs[kBack_Face] = | |
| 342 settings[1].fFuncRefs[kFront_Face]; | |
| 343 } else { | |
| 344 settings[0] = gUserToClipXorPass0; | |
| 345 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 346 settings[0].fFuncMasks[kBack_Face] = | |
| 347 settings[0].fFuncMasks[kFront_Face]; | |
| 348 | |
| 349 settings[1] = gUserToClipXorPass1; | |
| 350 settings[1].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 351 settings[1].fFuncRefs[kBack_Face] = | |
| 352 settings[1].fFuncRefs[kFront_Face]; | |
| 353 } | |
| 354 break; | |
| 355 case SkRegion::kDifference_Op: | |
| 356 *numPasses = 1; | |
| 357 settings[0] = invertedFill ? gInvUserToClipDiff : gUserToClipDiff; | |
| 358 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 359 settings[0].fFuncRefs[kBack_Face] = | |
| 360 settings[0].fFuncRefs[kFront_Face]; | |
| 361 break; | |
| 362 case SkRegion::kReverseDifference_Op: | |
| 363 if (invertedFill) { | |
| 364 *numPasses = 2; | |
| 365 settings[0] = gInvUserToClipRDiffPass0; | |
| 366 settings[0].fWriteMasks[kFront_Face] |= stencilClipMask; | |
| 367 settings[0].fWriteMasks[kBack_Face] = | |
| 368 settings[0].fWriteMasks[kFront_Face]; | |
| 369 settings[1] = gInvUserToClipRDiffPass1; | |
| 370 settings[1].fWriteMasks[kFront_Face] &= ~stencilClipMask; | |
| 371 settings[1].fWriteMasks[kBack_Face] = | |
| 372 settings[1].fWriteMasks[kFront_Face]; | |
| 373 } else { | |
| 374 *numPasses = 2; | |
| 375 settings[0] = gUserToClipRDiffPass0; | |
| 376 settings[0].fFuncMasks[kFront_Face] &= ~stencilClipMask; | |
| 377 settings[0].fFuncMasks[kBack_Face] = | |
| 378 settings[0].fFuncMasks[kFront_Face]; | |
| 379 settings[0].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 380 settings[0].fFuncRefs[kBack_Face] = | |
| 381 settings[0].fFuncRefs[kFront_Face]; | |
| 382 | |
| 383 settings[1] = gUserToClipRDiffPass1; | |
| 384 settings[1].fFuncMasks[kFront_Face] |= stencilClipMask; | |
| 385 settings[1].fFuncRefs[kFront_Face] |= stencilClipMask; | |
| 386 settings[1].fFuncMasks[kBack_Face] = | |
| 387 settings[1].fFuncMasks[kFront_Face]; | |
| 388 settings[1].fFuncRefs[kBack_Face] = | |
| 389 settings[1].fFuncRefs[kFront_Face]; | |
| 390 } | |
| 391 break; | |
| 392 default: | |
| 393 SkFAIL("Unknown set op"); | |
| 394 } | |
| 395 return false; | |
| 396 } | |
| 397 | |
| 398 void GrStencilSettings::genKey(GrProcessorKeyBuilder* b) const { | |
| 399 static const int kCount = sizeof(GrStencilSettings) / sizeof(uint32_t); | |
| 400 GR_STATIC_ASSERT(0 == sizeof(GrStencilSettings) % sizeof(uint32_t)); | |
| 401 uint32_t* key = b->add32n(kCount); | |
| 402 memcpy(key, this, sizeof(GrStencilSettings)); | |
| 403 } | |
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Chromium Code Reviews
Issue 1962243002:
Separate user and raw stencil settings (Closed)
Base URL: https://skia.googlesource.com/skia.git@master