Consider index8 a compressed config.

src/gpu/GrTexture.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrTexture.h"
@@ skipping 40 matching lines @@
         const bool sizeChanged = kNotAllocated_MipMapsStatus == fMipMapsStatus;
         fMipMapsStatus = kValid_MipMapsStatus;
         if (sizeChanged) {
             // This must not be called until after changing fMipMapsStatus.
             this->didChangeGpuMemorySize();
         }
     }
 }
 
 size_t GrTexture::gpuMemorySize() const {
-    size_t textureSize =  (size_t) fDesc.fWidth *
-                                   fDesc.fHeight *
-                                   GrBytesPerPixel(fDesc.fConfig);
+    size_t textureSize;
 
     if (GrPixelConfigIsCompressed(fDesc.fConfig)) {
         textureSize = GrCompressedFormatDataSize(fDesc.fConfig, fDesc.fWidth, fDesc.fHeight);
+    } else {
+        textureSize = (size_t) fDesc.fWidth * fDesc.fHeight * GrBytesPerPixel(fDesc.fConfig);
     }
 
     if (this->impl()->hasMipMaps()) {
         // We don't have to worry about the mipmaps being a different size than
         // we'd expect because we never change fDesc.fWidth/fHeight.
         textureSize *= 2;
     }
     return textureSize;
 }
 
@@ skipping 158 matching lines @@
     return GrResourceKey(cacheID, texture_resource_type(), 0);
 }
 
 bool GrTextureImpl::NeedsResizing(const GrResourceKey& key) {
     return SkToBool(key.getResourceFlags() & kStretchToPOT_TextureFlag);
 }
 
 bool GrTextureImpl::NeedsBilerp(const GrResourceKey& key) {
     return SkToBool(key.getResourceFlags() & kBilerp_TextureFlag);
 }