start on apply gamma cleanup

src/image/SkImage_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 "SkAutoPixmapStorage.h"
 #include "GrCaps.h"
 #include "GrContext.h"
@@ skipping 65 matching lines @@
     dst->pixelRef()->setImmutableWithID(this->uniqueID());
     if (kAllow_CachingHint == chint) {
         SkBitmapCache::Add(this->uniqueID(), *dst);
         fAddedRasterVersionToCache.store(true);
     }
     return true;
 }
 
 GrTexture* SkImage_Gpu::asTextureRef(GrContext* ctx, const GrTextureParams& params,
                                      SkSourceGammaTreatment gammaTreatment) const {
+    if (fTexture->getContext() != ctx) {
+        return nullptr;
+    }
     return GrImageTextureAdjuster(as_IB(this)).refTextureSafeForParams(params, gammaTreatment,
                                                                        nullptr);
 }
 
 bool SkImage_Gpu::isOpaque() const {
     return GrPixelConfigIsOpaque(fTexture->config()) || fAlphaType == kOpaque_SkAlphaType;
 }
 
 static void apply_premul(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     switch (info.colorType()) {
@@ skipping 450 matching lines @@
         return nullptr;
     }
     SkAutoTUnref<GrTexture> texture(GrUploadMipMapToTexture(ctx, info, texels, mipLevelCount));
     if (!texture) {
         return nullptr;
     }
     return sk_make_sp<SkImage_Gpu>(texture->width(), texture->height(), kNeedNewImageUniqueID,
                                    info.alphaType(), texture, sk_ref_sp(info.colorSpace()),
                                    budgeted);
 }