Implement support for mixed sampled render targets

src/gpu/GrProcOptInfo.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrProcOptInfo_DEFINED
 #define GrProcOptInfo_DEFINED
 
@@ skipping 11 matching lines @@
  * optimizations related to eliminating stages and vertex attributes that aren't necessary for a
  * draw.
  */
 class GrProcOptInfo {
 public:
     GrProcOptInfo()
         : fInOut(0, static_cast<GrColorComponentFlags>(0), false)
         , fFirstEffectStageIndex(0)
         , fInputColorIsUsed(true)
         , fInputColor(0)
-        , fReadsFragPosition(false) {}
+        , fReadsFragPosition(false)
+        , fNeedsCoverageModulation(false) {}
 
     void calcWithInitialValues(const GrFragmentStage*, int stageCount, GrColor startColor,
                                GrColorComponentFlags flags, bool areCoverageStages);
 
     void calcColorWithBatch(const GrBatch*, const GrFragmentStage*, int stagecount);
     void calcCoverageWithBatch(const GrBatch*, const GrFragmentStage*, int stagecount);
 
     // TODO delete these when batch is everywhere
     void calcColorWithPrimProc(const GrPrimitiveProcessor*, const GrFragmentStage*, int stagecount);
     void calcCoverageWithPrimProc(const GrPrimitiveProcessor*, const GrFragmentStage*,
                                   int stagecount);
 
     bool isSolidWhite() const { return fInOut.isSolidWhite(); }
     bool isOpaque() const { return fInOut.isOpaque(); }
     bool isSingleComponent() const { return fInOut.isSingleComponent(); }
     bool allStagesMultiplyInput() const { return fInOut.allStagesMulInput(); }
 
     // TODO: Once texture pixel configs quaries are updated, we no longer need this function.
     // For now this function will correctly tell us if we are using LCD text or not and should only
     // be called when looking at the coverage output.
     bool isFourChannelOutput() const { return !fInOut.isSingleComponent() &&
                                                fInOut.isLCDCoverage(); }
 
+    bool needsCoverageModulation() const { return fNeedsCoverageModulation; }
+
+    void setNeedsCoverageModulation(bool modulate) {
+        fNeedsCoverageModulation = true;
+    }
+
     GrColor color() const { return fInOut.color(); }
     uint8_t validFlags() const { return fInOut.validFlags(); }
 
     /**
      * Returns the index of the first effective color stage. If an intermediate stage doesn't read
      * its input or has a known output, then we can ignore all earlier stages since they will not
      * affect the final output. Thus the first effective stage index is the index to the first stage
      * that will have an effect on the final output.
      *
      * If stages before the firstEffectiveStageIndex are removed, corresponding values from
@@ skipping 19 matching lines @@
     bool readsFragPosition() const { return fReadsFragPosition; }
 
 private:
     void internalCalc(const GrFragmentStage*, int stagecount, bool initWillReadFragPosition);
 
     GrInvariantOutput fInOut;
     int fFirstEffectStageIndex;
     bool fInputColorIsUsed;
     GrColor fInputColor;
     bool fReadsFragPosition;
+    bool fNeedsCoverageModulation;
 };
 
 #endif