Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

src/core/SkBlitter.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 "SkBlitter.h"
 #include "SkAntiRun.h"
 #include "SkColor.h"
@@ skipping 797 matching lines @@
 
     // which check, in case we're being called by a client with a dummy device
     // (e.g. they have a bounder that always aborts the draw)
     if (kUnknown_SkColorType == device.colorType() ||
             (drawCoverage && (kAlpha_8_SkColorType != device.colorType()))) {
         return allocator->createT<SkNullBlitter>();
     }
 
     SkShader* shader = origPaint.getShader();
     SkColorFilter* cf = origPaint.getColorFilter();
-    SkXfermode* mode = origPaint.getXfermode();
+    SkBlendMode mode = origPaint.getBlendMode();
     sk_sp<Sk3DShader> shader3D;
 
     SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
 
     if (origPaint.getMaskFilter() != nullptr &&
             origPaint.getMaskFilter()->getFormat() == SkMask::k3D_Format) {
         shader3D = sk_make_sp<Sk3DShader>(sk_ref_sp(shader));
         // we know we haven't initialized lazyPaint yet, so just do it
         paint.writable()->setShader(shader3D);
         shader = shader3D.get();
     }
 
-    if (mode) {
+    if (mode != SkBlendMode::kSrcOver) {
         bool deviceIsOpaque = kRGB_565_SkColorType == device.colorType();
         switch (SkInterpretXfermode(*paint, deviceIsOpaque)) {
             case kSrcOver_SkXfermodeInterpretation:
-                mode = nullptr;
-                paint.writable()->setXfermode(nullptr);
+                mode = SkBlendMode::kSrcOver;
+                paint.writable()->setBlendMode(mode);
                 break;
             case kSkipDrawing_SkXfermodeInterpretation:{
                 return allocator->createT<SkNullBlitter>();
             }
             default:
                 break;
         }
     }
 
     /*
      *  If the xfermode is CLEAR, then we can completely ignore the installed
      *  color/shader/colorfilter, and just pretend we're SRC + color==0. This
      *  will fall into our optimizations for SRC mode.
      */
-    if (SkXfermode::IsMode(mode, SkXfermode::kClear_Mode)) {
+    if (mode == SkBlendMode::kClear) {
         SkPaint* p = paint.writable();
         p->setShader(nullptr);
         shader = nullptr;
         p->setColorFilter(nullptr);
         cf = nullptr;
-        mode = p->setXfermodeMode(SkXfermode::kSrc_Mode);
+        p->setBlendMode(mode = SkBlendMode::kSrc);
         p->setColor(0);
     }
 
     if (SkBlitter* blitter = SkCreateRasterPipelineBlitter(device, *paint, allocator)) {
         return blitter;
     }
 
     if (nullptr == shader) {
-        if (mode) {
+        if (mode != SkBlendMode::kSrcOver) {
             // xfermodes (and filters) require shaders for our current blitters
             paint.writable()->setShader(SkShader::MakeColorShader(paint->getColor()));
             paint.writable()->setAlpha(0xFF);
             shader = paint->getShader();
         } else if (cf) {
             // if no shader && no xfermode, we just apply the colorfilter to
             // our color and move on.
             SkPaint* writablePaint = paint.writable();
             writablePaint->setColor(cf->filterColor(paint->getColor()));
             writablePaint->setColorFilter(nullptr);
@@ skipping 30 matching lines @@
         } else {
             return allocator->createT<SkNullBlitter>();
         }
     }
 
     SkBlitter*  blitter = nullptr;
     switch (device.colorType()) {
         case kAlpha_8_SkColorType:
             if (drawCoverage) {
                 SkASSERT(nullptr == shader);
-                SkASSERT(nullptr == paint->getXfermode());
+                SkASSERT(paint->isSrcOver());
                 blitter = allocator->createT<SkA8_Coverage_Blitter>(device, *paint);
             } else if (shader) {
                 blitter = allocator->createT<SkA8_Shader_Blitter>(device, *paint, shaderContext);
             } else {
                 blitter = allocator->createT<SkA8_Blitter>(device, *paint);
             }
             break;
 
         case kRGB_565_SkColorType:
             blitter = SkBlitter_ChooseD565(device, *paint, shaderContext, allocator);
@@ skipping 86 matching lines @@
     fShaderContext->~Context();
     SkShader::Context* ctx = fShader->createContext(rec, (void*)fShaderContext);
     if (nullptr == ctx) {
         // Need a valid context in fShaderContext's storage, so we can later (or our caller) call
         // the in-place destructor.
         new (fShaderContext) SkZeroShaderContext(*fShader, rec);
         return false;
     }
     return true;
 }