Add mixed samples support to XPs

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 142 matching lines @@
 }
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrArithmeticFP);
 
 ///////////////////////////////////////////////////////////////////////////////
 // Xfer Processor
 ///////////////////////////////////////////////////////////////////////////////
 
 class ArithmeticXP : public GrXferProcessor {
 public:
-    static GrXferProcessor* Create(float k1, float k2, float k3, float k4, bool enforcePMColor,
-                                   const DstTexture* dstTexture, bool willReadDstColor) {
-        return SkNEW_ARGS(ArithmeticXP, (k1, k2, k3, k4, enforcePMColor, dstTexture,
-                                         willReadDstColor));
-    }
-
-    ~ArithmeticXP() override {};
+    ArithmeticXP(const DstTexture*, bool hasMixedSamples,
+                 float k1, float k2, float k3, float k4, bool enforcePMColor);
 
     const char* name() const override { return "Arithmetic"; }
 
     GrGLXferProcessor* createGLInstance() const override;
 
     float k1() const { return fK1; }
     float k2() const { return fK2; }
     float k3() const { return fK3; }
     float k4() const { return fK4; }
     bool enforcePMColor() const { return fEnforcePMColor; }
 
 private:
-    ArithmeticXP(float k1, float k2, float k3, float k4, bool enforcePMColor,
-                   const DstTexture*, bool willReadDstColor);
-
     GrXferProcessor::OptFlags onGetOptimizations(const GrProcOptInfo& colorPOI,
                                                  const GrProcOptInfo& coveragePOI,
                                                  bool doesStencilWrite,
                                                  GrColor* overrideColor,
                                                  const GrCaps& caps) override;
 
     void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
 
     bool onIsEqual(const GrXferProcessor& xpBase) const override {
         const ArithmeticXP& xp = xpBase.cast<ArithmeticXP>();
@@ skipping 51 matching lines @@
     };
 
     GrGLProgramDataManager::UniformHandle fKUni;
     bool fEnforcePMColor;
 
     typedef GrGLXferProcessor INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
-ArithmeticXP::ArithmeticXP(float k1, float k2, float k3, float k4, bool enforcePMColor,
-                           const DstTexture* dstTexture, bool willReadDstColor)
-    : INHERITED(dstTexture, willReadDstColor)
+ArithmeticXP::ArithmeticXP(const DstTexture* dstTexture, bool hasMixedSamples,
+                           float k1, float k2, float k3, float k4, bool enforcePMColor)
+    : INHERITED(dstTexture, true, hasMixedSamples)
     , fK1(k1)
     , fK2(k2)
     , fK3(k3)
     , fK4(k4)
     , fEnforcePMColor(enforcePMColor) {
     this->initClassID<ArithmeticXP>();
 }
 
 void ArithmeticXP::onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
     GLArithmeticXP::GenKey(*this, caps, b);
@@ skipping 16 matching lines @@
 GrArithmeticXPFactory::GrArithmeticXPFactory(float k1, float k2, float k3, float k4,
                                              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 {
-    return ArithmeticXP::Create(fK1, fK2, fK3, fK4, fEnforcePMColor, dstTexture,
-                                this->willReadDstColor(caps, colorPOI, coveragePOI));
+    return SkNEW_ARGS(ArithmeticXP, (dstTexture, hasMixedSamples, fK1, fK2, fK3, fK4,
+                                     fEnforcePMColor));
 }
 
 
 void GrArithmeticXPFactory::getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
                                                      InvariantBlendedColor* blendedColor) const {
     blendedColor->fWillBlendWithDst = true;
 
     // TODO: We could try to optimize this more. For example if fK1 and fK3 are zero, then we won't
     // be blending the color with dst at all so we can know what the output color is (up to the
     // valid color components passed in).
     blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrArithmeticXPFactory);
 
 GrXPFactory* GrArithmeticXPFactory::TestCreate(SkRandom* random,
                                                GrContext*,
                                                const GrCaps&,
                                                GrTexture*[]) {
     float k1 = random->nextF();
     float k2 = random->nextF();
     float k3 = random->nextF();
     float k4 = random->nextF();
     bool enforcePMColor = random->nextBool();
 
     return GrArithmeticXPFactory::Create(k1, k2, k3, k4, enforcePMColor);
 }
 
 #endif