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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "GrDrawState.h" | 8 #include "GrDrawState.h" |
9 #include "GrPaint.h" | 9 #include "GrPaint.h" |
10 #include "GrDrawTargetCaps.h" | 10 #include "GrDrawTargetCaps.h" |
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389 } | 389 } |
390 | 390 |
391 // Run through the color stages | 391 // Run through the color stages |
392 for (int s = 0; s < this->numColorStages(); ++s) { | 392 for (int s = 0; s < this->numColorStages(); ++s) { |
393 const GrEffect* effect = this->getColorStage(s).getEffect(); | 393 const GrEffect* effect = this->getColorStage(s).getEffect(); |
394 effect->getConstantColorComponents(&color, &validComponentFlags); | 394 effect->getConstantColorComponents(&color, &validComponentFlags); |
395 } | 395 } |
396 | 396 |
397 // Check whether coverage is treated as color. If so we run through the cove
rage computation. | 397 // Check whether coverage is treated as color. If so we run through the cove
rage computation. |
398 if (this->isCoverageDrawing()) { | 398 if (this->isCoverageDrawing()) { |
399 GrColor coverageColor = this->getCoverageColor(); | 399 // The shader generated for coverage drawing runs the full coverage comp
utation and then |
400 GrColor oldColor = color; | 400 // makes the shader output be the multiplication of color and coverage.
We mirror that here. |
401 color = 0; | 401 GrColor coverage; |
402 for (int c = 0; c < 4; ++c) { | 402 uint32_t coverageComponentFlags; |
403 if (validComponentFlags & (1 << c)) { | 403 if (this->hasCoverageVertexAttribute()) { |
404 U8CPU a = (oldColor >> (c * 8)) & 0xff; | 404 coverageComponentFlags = 0; |
405 U8CPU b = (coverageColor >> (c * 8)) & 0xff; | 405 coverage = 0; // suppresses any warnings. |
406 color |= (SkMulDiv255Round(a, b) << (c * 8)); | 406 } else { |
407 } | 407 coverageComponentFlags = kRGBA_GrColorComponentFlags; |
| 408 coverage = this->getCoverageColor(); |
408 } | 409 } |
| 410 |
| 411 // Run through the coverage stages |
409 for (int s = 0; s < this->numCoverageStages(); ++s) { | 412 for (int s = 0; s < this->numCoverageStages(); ++s) { |
410 const GrEffect* effect = this->getCoverageStage(s).getEffect(); | 413 const GrEffect* effect = this->getCoverageStage(s).getEffect(); |
411 effect->getConstantColorComponents(&color, &validComponentFlags); | 414 effect->getConstantColorComponents(&coverage, &coverageComponentFlag
s); |
412 } | 415 } |
| 416 |
| 417 // Since the shader will multiply coverage and color, the only way the f
inal A==1 is if |
| 418 // coverage and color both have A==1. |
| 419 return (kA_GrColorComponentFlag & validComponentFlags & coverageComponen
tFlags) && |
| 420 0xFF == GrColorUnpackA(color) && 0xFF == GrColorUnpackA(coverage
); |
| 421 |
413 } | 422 } |
414 return (kA_GrColorComponentFlag & validComponentFlags) && 0xff == GrColorUnp
ackA(color); | 423 |
| 424 return (kA_GrColorComponentFlag & validComponentFlags) && 0xFF == GrColorUnp
ackA(color); |
415 } | 425 } |
416 | 426 |
417 bool GrDrawState::hasSolidCoverage() const { | 427 bool GrDrawState::hasSolidCoverage() const { |
418 // If we're drawing coverage directly then coverage is effectively treated a
s color. | 428 // If we're drawing coverage directly then coverage is effectively treated a
s color. |
419 if (this->isCoverageDrawing()) { | 429 if (this->isCoverageDrawing()) { |
420 return true; | 430 return true; |
421 } | 431 } |
422 | 432 |
423 GrColor coverage; | 433 GrColor coverage; |
424 uint32_t validComponentFlags; | 434 uint32_t validComponentFlags; |
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692 fDrawState->getColorStage(s).saveCoordChange(&fSavedCoordChanges[i]); | 702 fDrawState->getColorStage(s).saveCoordChange(&fSavedCoordChanges[i]); |
693 fDrawState->fState.fColorStages[s].localCoordChange(coordChangeMatrix); | 703 fDrawState->fState.fColorStages[s].localCoordChange(coordChangeMatrix); |
694 } | 704 } |
695 | 705 |
696 int numCoverageStages = fDrawState->numCoverageStages(); | 706 int numCoverageStages = fDrawState->numCoverageStages(); |
697 for (int s = 0; s < numCoverageStages; ++s, ++i) { | 707 for (int s = 0; s < numCoverageStages; ++s, ++i) { |
698 fDrawState->getCoverageStage(s).saveCoordChange(&fSavedCoordChanges[i]); | 708 fDrawState->getCoverageStage(s).saveCoordChange(&fSavedCoordChanges[i]); |
699 fDrawState->fState.fCoverageStages[s].localCoordChange(coordChangeMatrix
); | 709 fDrawState->fState.fCoverageStages[s].localCoordChange(coordChangeMatrix
); |
700 } | 710 } |
701 } | 711 } |
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