Revert of Create xfer processor backend.

src/gpu/GrOptDrawState.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOptDrawState.h"
 
 #include "GrDrawState.h"
@@ skipping 26 matching lines @@
     GrXferProcessor::OptFlags optFlags;
     if (xferProcessor) {
         fXferProcessor.reset(xferProcessor.get());
 
         optFlags = xferProcessor->getOptimizations(colorPOI,
                                                    coveragePOI,
                                                    drawState.isCoverageDrawing(),
                                                    drawState.isColorWriteDisabled(),
                                                    drawState.getStencil().doesWrite(),
                                                    &fColor,
-                                                   &fCoverage,
-                                                   caps);
+                                                   &fCoverage);
     }
 
     // When path rendering the stencil settings are not always set on the draw state
     // so we must check the draw type. In cases where we will skip drawing we simply return a
     // null GrOptDrawState.
     if (!xferProcessor || ((GrXferProcessor::kSkipDraw_OptFlag & optFlags) &&
                            GrGpu::kStencilPath_DrawType != drawType)) {
         // Set the fields that don't default init and return. The lack of a render target will
         // indicate that this can be skipped.
         fFlags = 0;
@@ skipping 81 matching lines @@
 
     // let the GP init the batch tracker
     if (drawState.hasGeometryProcessor()) {
         GrGeometryProcessor::InitBT init;
         init.fOutputColor = fDescInfo.fInputColorIsUsed;
         init.fOutputCoverage = fDescInfo.fInputCoverageIsUsed;
         init.fColor = this->getColor();
         init.fCoverage = this->getCoverage();
         fGeometryProcessor->initBatchTracker(&fBatchTracker, init);
     }
+
+    this->setOutputStateInfo(drawState, coverageColor, optFlags, caps);
+}
+
+void GrOptDrawState::setOutputStateInfo(const GrDrawState& ds,
+                                        GrColor coverage,
+                                        GrXferProcessor::OptFlags optFlags,
+                                        const GrDrawTargetCaps& caps) {
+    // Set this default and then possibly change our mind if there is coverage.
+    fDescInfo.fPrimaryOutputType = GrProgramDesc::kModulate_PrimaryOutputType;
+    fDescInfo.fSecondaryOutputType = GrProgramDesc::kNone_SecondaryOutputType;
+
+    // Determine whether we should use dual source blending or shader code to keep coverage
+    // separate from color.
+    bool keepCoverageSeparate = !(optFlags & GrXferProcessor::kSetCoverageDrawing_OptFlag);
+    if (keepCoverageSeparate && !ds.hasSolidCoverage(coverage)) {
+        if (caps.dualSourceBlendingSupport()) {
+            if (kZero_GrBlendCoeff == fDstBlend) {
+                // write the coverage value to second color
+                fDescInfo.fSecondaryOutputType = GrProgramDesc::kCoverage_SecondaryOutputType;
+                fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff;
+            } else if (kSA_GrBlendCoeff == fDstBlend) {
+                // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
+                fDescInfo.fSecondaryOutputType = GrProgramDesc::kCoverageISA_SecondaryOutputType;
+                fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff;
+            } else if (kSC_GrBlendCoeff == fDstBlend) {
+                // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
+                fDescInfo.fSecondaryOutputType = GrProgramDesc::kCoverageISC_SecondaryOutputType;
+                fDstBlend = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff;
+            }
+        } else if (fDescInfo.fReadsDst &&
+                   kOne_GrBlendCoeff == fSrcBlend &&
+                   kZero_GrBlendCoeff == fDstBlend) {
+            fDescInfo.fPrimaryOutputType = GrProgramDesc::kCombineWithDst_PrimaryOutputType;
+        }
+    }
 }
 
 void GrOptDrawState::adjustProgramFromOptimizations(const GrDrawState& ds,
                                                     GrXferProcessor::OptFlags flags,
                                                     const GrProcOptInfo& colorPOI,
                                                     const GrProcOptInfo& coveragePOI,
                                                     int* firstColorStageIdx,
                                                     int* firstCoverageStageIdx) {
     fDescInfo.fReadsDst = false;
     fDescInfo.fReadsFragPosition = false;
@@ skipping 60 matching lines @@
     if (this->hasGeometryProcessor()) {
         if (!that.hasGeometryProcessor()) {
             return false;
         } else if (!this->getGeometryProcessor()->isEqual(*that.getGeometryProcessor())) {
             return false;
         }
     } else if (that.hasGeometryProcessor()) {
         return false;
     }
 
-    if (!this->getXferProcessor()->isEqual(*that.getXferProcessor())) {
-        return false;
-    }
-
     // The program desc comparison should have already assured that the stage counts match.
     SkASSERT(this->numFragmentStages() == that.numFragmentStages());
     for (int i = 0; i < this->numFragmentStages(); i++) {
 
         if (this->getFragmentStage(i) != that.getFragmentStage(i)) {
             return false;
         }
     }
     return true;
 }