Add Coverage Drawing XP

src/gpu/GrDrawState.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawState.h"
 
 #include "GrBlend.h"
@@ skipping 167 matching lines @@
         return true;
     }
 
     this->calcColorInvariantOutput(color);
 
     // The coverage isn't actually white, its unknown, but this will produce the same effect
     // TODO we want to cache the result of this call, but we can probably clean up the interface
     // so we don't have to pass in a seemingly known coverage
     this->calcCoverageInvariantOutput(GrColor_WHITE);
     return fXPFactory->canApplyCoverage(fColorProcInfo, fCoverageProcInfo,
-                                        this->isCoverageDrawing(), this->isColorWriteDisabled());
-}
-
-bool GrDrawState::hasSolidCoverage(const GrPrimitiveProcessor* pp) const {
-    // If we're drawing coverage directly then coverage is effectively treated as color.
-    if (this->isCoverageDrawing()) {
-        return true;
-    }
-
-    if (this->numCoverageStages() > 0) {
-        return false;
-    }
-
-    this->calcCoverageInvariantOutput(pp);
-    return fCoverageProcInfo.isSolidWhite();
+                                        this->isColorWriteDisabled());
 }
 
 //////////////////////////////////////////////////////////////////////////////s
 
 bool GrDrawState::willEffectReadDstColor(const GrPrimitiveProcessor* pp) const {
     this->calcColorInvariantOutput(pp);
     this->calcCoverageInvariantOutput(pp);
     // TODO: Remove need to create the XP here.
     //       Also once all custom blends are turned into XPs we can remove the need
     //       to check other stages since only xp's will be able to read dst
@@ skipping 32 matching lines @@
         fCoverageEffectCnt = ds->numCoverageStages();
         SkDEBUGCODE(++ds->fBlockEffectRemovalCnt;)
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 // Some blend modes allow folding a fractional coverage value into the color's alpha channel, while
 // others will blend incorrectly.
 bool GrDrawState::canTweakAlphaForCoverage() const {
-    return fXPFactory->canTweakAlphaForCoverage(this->isCoverageDrawing());
+    return fXPFactory->canTweakAlphaForCoverage();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 void GrDrawState::AutoViewMatrixRestore::restore() {
     if (fDrawState) {
         SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
         fDrawState->fViewMatrix = fViewMatrix;
         SkASSERT(fDrawState->numColorStages() >= fNumColorStages);
         int numCoverageStages = fSavedCoordChanges.count() - fNumColorStages;
@@ skipping 81 matching lines @@
 GrDrawState::~GrDrawState() {
     SkASSERT(0 == fBlockEffectRemovalCnt);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrDrawState::willBlendWithDst(const GrPrimitiveProcessor* pp) const {
     this->calcColorInvariantOutput(pp);
     this->calcCoverageInvariantOutput(pp);
     return fXPFactory->willBlendWithDst(fColorProcInfo, fCoverageProcInfo,
-                                        this->isCoverageDrawing(), this->isColorWriteDisabled());
+                                        this->isColorWriteDisabled());
 }
 
 void GrDrawState::calcColorInvariantOutput(const GrPrimitiveProcessor* pp) const {
     if (!fColorProcInfoValid || fColorPrimProc != pp) {
         fColorProcInfo.calcColorWithPrimProc(pp, fColorStages.begin(), this->numColorStages());
         fColorProcInfoValid = true;
         fColorPrimProc = pp;
     }
 }
 
@@ skipping 19 matching lines @@
 void GrDrawState::calcCoverageInvariantOutput(GrColor coverage) const {
     if (!fCoverageProcInfoValid || coverage != fCoverageCache) {
         GrColorComponentFlags flags = kRGBA_GrColorComponentFlags;
         fCoverageProcInfo.calcWithInitialValues(fCoverageStages.begin(),
                                                 this->numCoverageStages(), coverage, flags,
                                                 true);
         fCoverageProcInfoValid = true;
         fCoverageCache = coverage;
     }
 }