skia/src/include/core/SkMallocPixelRef.h

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SkMallocPixelRef_DEFINED
#define SkMallocPixelRef_DEFINED

#include "SkPixelRef.h"

/** We explicitly use the same allocator for our pixels that SkMask does,
    so that we can freely assign memory allocated by one class to the other.
*/
class SkMallocPixelRef : public SkPixelRef {
public:
    /** Allocate the specified buffer for pixels. The memory is freed when the
        last owner of this pixelref is gone.
     */
    SkMallocPixelRef(void* addr, size_t size, SkColorTable* ctable);
    virtual ~SkMallocPixelRef();
    
    //! Return the allocation size for the pixels
    size_t getSize() const { return fSize; }

    // overrides from SkPixelRef
    virtual void flatten(SkFlattenableWriteBuffer&) const;
    virtual Factory getFactory() const {
        return Create;
    }
    static SkPixelRef* Create(SkFlattenableReadBuffer& buffer) {
        return SkNEW_ARGS(SkMallocPixelRef, (buffer));
    }

protected:
    // overrides from SkPixelRef
    virtual void* onLockPixels(SkColorTable**);
    virtual void onUnlockPixels();

    SkMallocPixelRef(SkFlattenableReadBuffer& buffer);

private:
    void*           fStorage;
    size_t          fSize;
    SkColorTable*   fCTable;

    typedef SkPixelRef INHERITED;
};

#endif