Revert of Make specialized SrcOver XPFactory

src/core/SkXfermode.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermode.h"
 #include "SkXfermode_proccoeff.h"
@@ skipping 638 matching lines @@
 
 bool SkXfermode::asMode(Mode* mode) const {
     return false;
 }
 
 bool SkXfermode::asFragmentProcessor(const GrFragmentProcessor**,
                                      const GrFragmentProcessor*) const {
     return false;
 }
 
-bool SkXfermode::asXPFactory(const GrXPFactory**) const {
+bool SkXfermode::asXPFactory(GrXPFactory**) const {
     return false;
 }
 
 
 #if SK_SUPPORT_GPU
 #include "effects/GrPorterDuffXferProcessor.h"
 
-bool SkXfermode::AsXPFactory(SkXfermode* xfermode,  const GrXPFactory** xpf) {
+bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) {
     if (nullptr == xfermode) {
         if (xpf) {
             *xpf = GrPorterDuffXPFactory::Create(kSrcOver_Mode);
         }
         return true;
     } else {
         return xfermode->asXPFactory(xpf);
     }
 }
 #else
-bool SkXfermode::AsXPFactory(SkXfermode* xfermode, const GrXPFactory** xpf) {
+bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) {
     return false;
 }
 #endif
 
 SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) const{
     // no-op. subclasses should override this
     return dst;
 }
 
 void SkXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
@@ skipping 236 matching lines @@
 bool SkProcCoeffXfermode::asFragmentProcessor(const GrFragmentProcessor** fp,
                                               const GrFragmentProcessor* dst) const {
     if (fp) {
         SkASSERT(dst);
         *fp = GrXfermodeFragmentProcessor::CreateFromDstProcessor(dst, fMode);
         SkASSERT(*fp || kSrc_Mode == fMode);
     }
     return true;
 }
 
-bool SkProcCoeffXfermode::asXPFactory(const GrXPFactory** xp) const {
+bool SkProcCoeffXfermode::asXPFactory(GrXPFactory** xp) const {
     if (CANNOT_USE_COEFF != fSrcCoeff) {
         if (xp) {
             *xp = GrPorterDuffXPFactory::Create(fMode);
             SkASSERT(*xp);
         }
         return true;
     }
 
     if (GrCustomXfermode::IsSupportedMode(fMode)) {
         if (xp) {
@@ skipping 137 matching lines @@
     if (!xfer) {
         return SkXfermode::kOpaque_SrcColorOpacity == opacityType;
     }
 
     return xfer->isOpaque(opacityType);
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END