start on apply gamma cleanup

src/image/SkSurface_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSurface_Gpu.h"
 
 #include "GrResourceProvider.h"
@@ skipping 111 matching lines @@
 }
 
 void SkSurface_Gpu::onDiscard() {
     fDevice->accessDrawContext()->discard();
 }
 
 void SkSurface_Gpu::onPrepareForExternalIO() {
     fDevice->flush();
 }
 
+bool SkSurface_Gpu::onBlitWithGamma(SkImage* image, SkScalar gamma) {
+    GrRenderTarget* dst = fDevice->accessDrawContext()->accessRenderTarget();
+    if (GrTexture* src = as_IB(image)->asTextureRef(dst->getContext(),
+                                                    GrTextureParams::ClampNoFilter(),
+                                                    SkSourceGammaTreatment::kRespect)) {
+        fDevice.get()->context()->applyGamma(dst, src, gamma);
+        return true;
+    }
+    return false;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 sk_sp<SkSurface> SkSurface::MakeRenderTargetDirect(GrRenderTarget* target,
                                                    sk_sp<SkColorSpace> colorSpace,
                                                    const SkSurfaceProps* props) {
     sk_sp<SkGpuDevice> device(
         SkGpuDevice::Make(sk_ref_sp(target), std::move(colorSpace), props,
                           SkGpuDevice::kUninit_InitContents));
     if (!device) {
         return nullptr;
@@ skipping 68 matching lines @@
     }
     sk_sp<SkGpuDevice> device(SkGpuDevice::Make(std::move(rt), std::move(colorSpace), props,
                                                 SkGpuDevice::kUninit_InitContents));
     if (!device) {
         return nullptr;
     }
     return sk_make_sp<SkSurface_Gpu>(std::move(device));
 }
 
 #endif