/*******************************************************************************

 * Copyright (c) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial API and implementation

 *******************************************************************************/

#ifndef IMAGELOADER_H_

#define IMAGELOADER_H_

#include "graphics.h"

class QImageReader;

namespace Java { namespace GFX {

class ImageloaderImpl : public ImageLoader

{

public:

    /**

     * Ctor

     */

    /**

     * Dtor

     */

    virtual ~ImageloaderImpl();

    /**

     * from ImageLoader

     * @see ImageLoader

     */

    virtual void append(const char* aData, int aLength, int aOffset);

    virtual void beginStream(int aBufferSize);

    virtual Image* endStream();

    virtual void dispose();

    virtual Image* load(const QString& aFileName);

    virtual void setLoadSize(int aWidth, int aHeight);

private:

    /**

     * Helper method for increasing internal buffer size

     * @param newSize The total buffer size to which the buffer sould be grown to

     * @throws GfxException if memory allocation fails

     */

    void growBuffer(int aNewSize);

    /**

     *  Resets bufferData, i.e. frees resources

     */

    void resetData();

    /**

     * Checks the error codes from the reader and throws the appropriate 

     * exception. 

     */

    void throwError(const QImageReader& aReader);

    /**

     * If "scale-on-load" size has been set then applies that to the reader. 

     */

    void applyLoadSize(QImageReader& aReader);

    /**

     * Struct for buffer related data

     */

    struct bufferData

    {

        /**

         * Pointer to data buffer

         */

        char* buffer;

        /**

         * The total capacity of data buffer

         */

        int capacity;

        /**

         * The total allocation of the data buffer

         */

        int allocation;

    };

    bufferData* mBufferData;

    int loadSizeWidth;

    int loadSizeHeight;

};

} // namespace GFX

} // namespace Java

#endif /*IMAGELOADER_H_*/