SkDiscardableMemory::Factory class

src/core/SkDiscardableMemory.h

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkDiscardableMemory_DEFINED
-#define SkDiscardableMemory_DEFINED
-
-#include "SkTypes.h"
-
-/**
- *  Interface for discardable memory. Implementation is provided by the
- *  embedder.
- */
-class SK_API SkDiscardableMemory {
-
-public:
-    /**
-     *  Factory method that creates, initializes and locks an SkDiscardableMemory
-     *  object. If either of these steps fails, a NULL pointer will be returned.
-     */
-    static SkDiscardableMemory* Create(size_t bytes);
-
-    /** Must not be called while locked.
-     */
-    virtual ~SkDiscardableMemory() {}
-
-    /**
-     * Locks the memory, prevent it from being discarded. Once locked. you may
-     * obtain a pointer to that memory using the data() method.
-     *
-     * lock() may return false, indicating that the underlying memory was
-     * discarded and that the lock failed.
-     *
-     * Nested calls to lock are not allowed.
-     */
-    virtual bool lock() = 0;
-
-    /**
-     * Returns the current pointer for the discardable memory. This call is ONLY
-     * valid when the discardable memory object is locked.
-     */
-    virtual void* data() = 0;
-
-    /**
-     * Unlock the memory so that it can be purged by the system. Must be called
-     * after every successful lock call.
-     */
-    virtual void unlock() = 0;
-};
-
-#endif