start on apply gamma cleanup

tools/viewer/sk_app/WindowContext.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 "GrContext.h"
 #include "SkSurface.h"
@@ skipping 47 matching lines @@
         }
     } else {
         return SkSurface::MakeFromBackendRenderTarget(fContext, *rtDesc, &props);
     }
 }
 
 void WindowContext::presentRenderSurface(sk_sp<SkSurface> renderSurface, sk_sp<GrRenderTarget> rt,
                                          int colorBits) {
     if (!this->isGpuContext() || colorBits > 24 ||
         kRGBA_F16_SkColorType == fDisplayParams.fColorType) {
+        sk_sp<SkImage> image = renderSurface->makeImageSnapshot();
+
         // We made/have an off-screen surface. Get the contents as an SkImage:
         SkImageInfo info = SkImageInfo::Make(fWidth, fHeight,
                                              fDisplayParams.fColorType,
                                              kUnknown_SkAlphaType,
                                              fDisplayParams.fColorSpace);
         SkBitmap bm;
         bm.allocPixels(info);
         renderSurface->getCanvas()->readPixels(&bm, 0, 0);
         SkPixmap pm;
         bm.peekPixels(&pm);
         sk_sp<SkImage> image(SkImage::MakeTextureFromPixmap(fContext, pm,
                              SkBudgeted::kNo));
         GrTexture* texture = as_IB(image)->peekTexture();
         SkASSERT(texture);
 
         // 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 = (colorBits == 30) && SkImageInfoIsGammaCorrect(info);
         fContext->applyGamma(rt.get(), texture, doGamma ? 1.0f / 2.2f : 1.0f);
     }
 }
 
 }   //namespace sk_app