Propagate premultiplied color enforcement flag

src/effects/SkArithmeticMode_gpu.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkArithmeticMode_gpu.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 36 matching lines @@
     if (gUseUnpremul) {
         fsBuilder->codeAppendf("%s.rgb *= %s.a;", outputColor, outputColor);
     } else if (enforcePMColor) {
         fsBuilder->codeAppendf("%s.rgb = min(%s.rgb, %s.a);",
                                outputColor, outputColor, outputColor);
     }
 }
 
 class GLArithmeticFP : public GrGLFragmentProcessor {
 public:
-    GLArithmeticFP(const GrProcessor&) : fEnforcePMColor(true) {}
+    GLArithmeticFP(const GrArithmeticFP& arithmeticFP)
+        : fEnforcePMColor(arithmeticFP.enforcePMColor()) {}
 
     ~GLArithmeticFP() override {}
 
     void emitCode(EmitArgs& args) override {
         GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
         SkString dstColor("dstColor");
         this->emitChild(0, nullptr, &dstColor, args);
 
         fKUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                           kVec4f_GrSLType, kDefault_GrSLPrecision,
@@ skipping 116 matching lines @@
     float                       fK1, fK2, fK3, fK4;
     bool                        fEnforcePMColor;
 
     typedef GrXferProcessor INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class GLArithmeticXP : public GrGLXferProcessor {
 public:
-    GLArithmeticXP(const GrProcessor&)
-        : fEnforcePMColor(true) {
+    GLArithmeticXP(const ArithmeticXP& arithmeticXP)
+        : fEnforcePMColor(arithmeticXP.enforcePMColor()) {
     }
 
     ~GLArithmeticXP() override {}
 
     static void GenKey(const GrProcessor& processor, const GrGLSLCaps& caps,
                        GrProcessorKeyBuilder* b) {
         const ArithmeticXP& arith = processor.cast<ArithmeticXP>();
         uint32_t key = arith.enforcePMColor() ? 1 : 0;
         b->add32(key);
     }
@@ skipping 47 matching lines @@
                                                            const GrProcOptInfo& coveragePOI,
                                                            bool doesStencilWrite,
                                                            GrColor* overrideColor,
                                                            const GrCaps& caps) {
    return GrXferProcessor::kNone_OptFlags;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrArithmeticXPFactory::GrArithmeticXPFactory(float k1, float k2, float k3, float k4,
-                                             bool enforcePMColor) 
+                                             bool enforcePMColor)
     : fK1(k1), fK2(k2), fK3(k3), fK4(k4), fEnforcePMColor(enforcePMColor) {
     this->initClassID<GrArithmeticXPFactory>();
 }
 
 GrXferProcessor*
 GrArithmeticXPFactory::onCreateXferProcessor(const GrCaps& caps,
                                              const GrProcOptInfo& colorPOI,
                                              const GrProcOptInfo& coveragePOI,
                                              bool hasMixedSamples,
                                              const DstTexture* dstTexture) const {
@@ skipping 17 matching lines @@
     float k1 = d->fRandom->nextF();
     float k2 = d->fRandom->nextF();
     float k3 = d->fRandom->nextF();
     float k4 = d->fRandom->nextF();
     bool enforcePMColor = d->fRandom->nextBool();
 
     return GrArithmeticXPFactory::Create(k1, k2, k3, k4, enforcePMColor);
 }
 
 #endif