Replace fWillReadFragmentPosition with a bitfield

src/gpu/GrProcOptInfo.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 "GrProcOptInfo.h"
 
 #include "GrGeometryProcessor.h"
 
 #include "batches/GrDrawBatch.h"
 
 void GrProcOptInfo::calcWithInitialValues(const GrFragmentProcessor * const processors[],
                                           int cnt,
                                           GrColor startColor,
                                           GrColorComponentFlags flags,
                                           bool areCoverageStages,
                                           bool isLCD) {
     GrInitInvariantOutput out;
     out.fIsSingleComponent = areCoverageStages;
     out.fColor = startColor;
     out.fValidFlags = flags;
     out.fIsLCDCoverage = isLCD;
     fInOut.reset(out);
-    this->internalCalc(processors, cnt, false);
+    this->internalCalc(processors, cnt);
 }
 
 void GrProcOptInfo::initUsingInvariantOutput(GrInitInvariantOutput invOutput) {
     fInOut.reset(invOutput);
 }
 
 void GrProcOptInfo::completeCalculations(const GrFragmentProcessor * const processors[], int cnt) {
-    this->internalCalc(processors, cnt, false);
+    this->internalCalc(processors, cnt);
 }
 
-void GrProcOptInfo::internalCalc(const GrFragmentProcessor* const processors[],
-                                 int cnt,
-                                 bool initWillReadFragmentPosition) {
+void GrProcOptInfo::internalCalc(const GrFragmentProcessor* const processors[], int cnt) {
     fFirstEffectiveProcessorIndex = 0;
     fInputColorIsUsed = true;
     fInputColor = fInOut.color();
-    fReadsFragPosition = initWillReadFragmentPosition;
 
     for (int i = 0; i < cnt; ++i) {
         const GrFragmentProcessor* processor = processors[i];
         fInOut.resetWillUseInputColor();
         processor->computeInvariantOutput(&fInOut);
         SkDEBUGCODE(fInOut.validate());
         if (!fInOut.willUseInputColor()) {
             fFirstEffectiveProcessorIndex = i;
             fInputColorIsUsed = false;
-            // Reset these since we don't care if previous stages read these values
-            fReadsFragPosition = initWillReadFragmentPosition;
-        }
-        if (processor->willReadFragmentPosition()) {
-            fReadsFragPosition = true;
         }
         if (kRGBA_GrColorComponentFlags == fInOut.validFlags()) {
             fFirstEffectiveProcessorIndex = i + 1;
             fInputColor = fInOut.color();
             fInputColorIsUsed = true;
             // Since we are clearing all previous color stages we are in a state where we have found
             // zero stages that don't multiply the inputColor.
             fInOut.resetNonMulStageFound();
-            // Reset these since we don't care if previous stages read these values
-            fReadsFragPosition = initWillReadFragmentPosition;
         }
     }
 }