Allow GPU resources to not be counted against the cache budget.

src/gpu/GrGpuResourceCacheAccess.h

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpuResourceCacheAccess_DEFINED
 #define GrGpuResourceCacheAccess_DEFINED
@@ skipping 11 matching lines @@
      * be converted to a content resource. Currently this may only be called once per resource. It
      * fails if there is already a resource with the same content key. TODO: make this supplant the
      * resource that currently is using the content key, allow resources' content keys to change,
      * and allow removal of a content key to convert a resource back to scratch.
      */
     bool setContentKey(const GrResourceKey& contentKey) {
         return fResource->setContentKey(contentKey);
     }
 
     /**
+     * Changes whether the resource counts against the resource cache budget.
+     */
+    void setBudgeted(bool countsAgainstBudget) { fResource->setBudgeted(countsAgainstBudget); }

[bsalomon, 2014/11/13 19:20:54]

This class provides privileged access the parts of GrGpuResource that deal with
the cache. It exists for code in src/gpu to manipulate caching without allowing
that state to be manipulated outside Skia.

I've added this function to control whether a resource is budgeted and a query
below.

+
+    /**
      * Is the resource currently cached as scratch? This means it has a valid scratch key and does
      * not have a content key.
      */
     bool isScratch() const {
         SkASSERT(fResource->fScratchKey.isScratch());
         return NULL == this->getContentKey() && !fResource->fScratchKey.isNullScratch();
     }
 
     /** 
      * If this resource can be used as a scratch resource this returns a valid scratch key.
      * Otherwise it returns a key for which isNullScratch is true. The resource may currently be
      * used as content resource rather than scratch. Check isScratch().
      */
     const GrResourceKey& getScratchKey() const { return fResource->fScratchKey; }
 
     /**
      * If the resource is currently cached by a content key, the key is returned, otherwise NULL.
      */
     const GrResourceKey* getContentKey() const {
-        if (fResource->fContentKeySet) {
+        if (fResource->fFlags & GrGpuResource::kContentKeySet_Flag) {
             return &fResource->fContentKey;
         }
         return NULL;
     }
 
+    /**
+     * Is the resource object wrapping an externally allocated GPU resource?
+     */
     bool isWrapped() const { return fResource->isWrapped(); }
 
+    /**
+     * Does the resource count against the resource budget?
+     */
+    bool isBudgeted() const { 
+        bool ret = SkToBool(GrGpuResource::kBudgeted_Flag & fResource->fFlags);
+        SkASSERT(!(ret && fResource->isWrapped()));
+        return ret;
+    }
+
 private:
     CacheAccess(GrGpuResource* resource) : fResource(resource) { }
     CacheAccess(const CacheAccess& that) : fResource(that.fResource) { }
     CacheAccess& operator=(const CacheAccess&); // unimpl
 
     // No taking addresses of this type.
     const CacheAccess* operator&() const;
     CacheAccess* operator&();
 
     GrGpuResource* fResource;
 
     friend class GrGpuResource; // to construct/copy this type.
 };
 
 inline GrGpuResource::CacheAccess GrGpuResource::cacheAccess() { return CacheAccess(this); }
 
 inline const GrGpuResource::CacheAccess GrGpuResource::cacheAccess() const {
     return CacheAccess(const_cast<GrGpuResource*>(this));
 }
 
 #endif