1 files changed, 63 insertions, 0 deletions
diff --git a/gpu/GrCacheable.h b/gpu/GrCacheable.h
new file mode 100644
index 0000000..39c62b1
--- /dev/null
+++ b/gpu/GrCacheable.h
@@ -0,0 +1,63 @@
+/*
+ * 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; }
+
+    /**
+     * This entry point should be called whenever gpuMemorySize() begins
+     * reporting a different size. If the object is in the cache, it will call
+     * gpuMemorySize() immediately and pass the new size on to the resource
+     * cache.
+     */
+    void didChangeGpuMemorySize() const;
+
+private:
+    GrResourceCacheEntry* fCacheEntry;  // NULL if not in cache
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif