Check for abandoned texture in GrTextureAdjuster::refTextureSafeForParams

src/gpu/GrTextureParamsAdjuster.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 "GrTextureParamsAdjuster.h"
 
 #include "GrCaps.h"
@@ skipping 147 matching lines @@
 }
 
 GrTexture* GrTextureAdjuster::refTextureSafeForParams(const GrTextureParams& params,
                                                       SkSourceGammaTreatment gammaTreatment,
                                                       SkIPoint* outOffset) {
     GrTexture* texture = this->originalTexture();
     GrContext* context = texture->getContext();
     CopyParams copyParams;
     const SkIRect* contentArea = this->contentAreaOrNull();
 
+    if (!context) {
+        // The texture was abandoned.
+        return nullptr;
+    }
+
     if (contentArea && GrTextureParams::kMipMap_FilterMode == params.filterMode()) {
         // If we generate a MIP chain for texture it will read pixel values from outside the content
         // area.
         copyParams.fWidth = contentArea->width();
         copyParams.fHeight = contentArea->height();
         copyParams.fFilter = GrTextureParams::kBilerp_FilterMode;
     } else if (!context->getGpu()->makeCopyForTextureParams(texture, params, &copyParams)) {
         if (outOffset) {
             if (contentArea) {
                 outOffset->set(contentArea->fLeft, contentArea->fRight);
@@ skipping 333 matching lines @@
 }
 
 GrTexture* GrTextureMaker::generateTextureForParams(const CopyParams& copyParams, bool willBeMipped,
                                                     SkSourceGammaTreatment gammaTreatment) {
     SkAutoTUnref<GrTexture> original(this->refOriginalTexture(willBeMipped, gammaTreatment));
     if (!original) {
         return nullptr;
     }
     return copy_on_gpu(original, nullptr, copyParams);
 }