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

tools/viewer/sk_app/mac/RasterWindowContext_mac.cpp

 
 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "../GLWindowContext.h"
 #include "SkCanvas.h"
@@ skipping 103 matching lines @@
         // We made/have an off-screen surface. Get the contents as an SkImage:
         sk_sp<SkImage> snapshot = fBackbufferSurface->makeImageSnapshot();
         
         // With ten-bit output, we need to manually apply the gamma of the output device
         // (unless we're in non-gamma correct mode, in which case our data is already
         // fake-sRGB, like we're expected to put in the 10-bit buffer):
         bool doGamma = (fActualColorBits == 30) &&
                        (fDisplayParams.fColorSpace != nullptr ||
                         kRGBA_F16_SkColorType == fDisplayParams.fColorType);
         SkPaint gammaPaint;
-        gammaPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        gammaPaint.setBlendMode(SkBlendMode::kSrc);
         if (doGamma) {
             gammaPaint.setColorFilter(SkGammaColorFilter::Make(1.0f / 2.2f));
         }
 
         sk_sp<SkSurface> gpuSurface = INHERITED::getBackbufferSurface();
         SkCanvas* gpuCanvas = gpuSurface->getCanvas();
         gpuCanvas->drawImage(snapshot, 0, 0, &gammaPaint);
         gpuCanvas->flush();
 
         SDL_GL_SwapWindow(fWindow);
     }
 }
 
 }  // anonymous namespace
 
 namespace sk_app {
 namespace window_context_factory {
 
 WindowContext* NewRasterForMac(const MacWindowInfo& info, const DisplayParams& params) {
     WindowContext* ctx = new RasterWindowContext_mac(info, params);
     if (!ctx->isValid()) {
         delete ctx;
         return nullptr;
     }
     return ctx;
 }
 
 }  // namespace window_context_factory
 }  // namespace sk_app