Add reference base class to GrGpuResource with pending IO references.

src/gpu/GrGpuResource.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 "GrGpuResource.h"
 #include "GrResourceCache2.h"
 #include "GrGpu.h"
 
+GrGpuRef::~GrGpuRef() {
+    SkASSERT(0 == fRefCnt);
+    SkASSERT(0 == fPendingReads);
+    SkASSERT(0 == fPendingWrites);
+    // Set to invalid values.
+    SkDEBUGCODE(fRefCnt = fPendingReads = fPendingWrites = -10;)
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 static inline GrResourceCache2* get_resource_cache2(GrGpu* gpu) {
     SkASSERT(NULL != gpu);
     SkASSERT(NULL != gpu->getContext());
     SkASSERT(NULL != gpu->getContext()->getResourceCache2());
     return gpu->getContext()->getResourceCache2();
 }
 
 GrGpuResource::GrGpuResource(GrGpu* gpu, bool isWrapped)
     : fGpu(gpu)
-    , fRefCnt(1)
     , fCacheEntry(NULL)
     , fUniqueID(CreateUniqueID())
     , fScratchKey(GrResourceKey::NullScratchKey()) {
     if (isWrapped) {
         fFlags = kWrapped_FlagBit;
     } else {
         fFlags = 0;
     }
 }
 
 void GrGpuResource::registerWithCache() {
     get_resource_cache2(fGpu)->insertResource(this);
 }
 
 GrGpuResource::~GrGpuResource() {
-    SkASSERT(0 == fRefCnt);
     // subclass should have released this.
     SkASSERT(this->wasDestroyed());
 }
 
 void GrGpuResource::release() { 
     if (NULL != fGpu) {
         this->onRelease();
         get_resource_cache2(fGpu)->removeResource(this);
         fGpu = NULL;
     }
@@ skipping 31 matching lines @@
 }
 
 uint32_t GrGpuResource::CreateUniqueID() {
     static int32_t gUniqueID = SK_InvalidUniqueID;
     uint32_t id;
     do {
         id = static_cast<uint32_t>(sk_atomic_inc(&gUniqueID) + 1);
     } while (id == SK_InvalidUniqueID);
     return id;
 }