Split GrResource into GrCacheable/GrGpuObject

include/gpu/GrCacheable.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 GrCacheable_DEFINED
+#define GrCacheable_DEFINED
+
+#include "SkRefCnt.h"
+
+class GrResourceCacheEntry;
+
+/**
+ * Base class for objects that can be kept in the GrResourceCache.
+ */
+class GrCacheable : public SkRefCnt {
+public:
+    SK_DECLARE_INST_COUNT(GrCacheable)
+
+    /**
+     * Retrieves the amount of GPU memory used by this resource in bytes. It is
+     * approximate since we aren't aware of additional padding or copies made
+     * by the driver.
+     *
+     * @return the amount of GPU memory used in bytes
+     */
+    virtual size_t gpuMemorySize() const = 0;
+
+    /**
+     * Checks whether the GPU memory allocated to this resource is still in effect.
+     * It can become invalid if its context is destroyed or lost, in which case it
+     * should no longer count against the GrResourceCache budget.
+     *
+     * @return true if this resource is still holding GPU memory
+     *         false otherwise.
+     */
+    virtual bool isValidOnGpu() const = 0;
+
+    void setCacheEntry(GrResourceCacheEntry* cacheEntry) { fCacheEntry = cacheEntry; }
+    GrResourceCacheEntry* getCacheEntry() { return fCacheEntry; }
+
+protected:
+    GrCacheable() : fCacheEntry(NULL) {}
+
+    bool isInCache() const { return NULL != fCacheEntry; }
+
+private:
+    GrResourceCacheEntry* fCacheEntry;  // NULL if not in cache
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif