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png_loader.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef PSP_PNG_IMAGE_H
#define PSP_PNG_IMAGE_H

#include <png.h>

00031 class PngLoader {
private:
      bool basicImageLoad();        // common operation
      bool findImageDimensions();   // find dimensions of a given PNG file
      bool loadImageIntoBuffer();

      static void warningFn(png_structp png_ptr, png_const_charp warning_msg);
      static void libReadFunc(png_structp pngPtr, png_bytep data, png_size_t length);

      Common::SeekableReadStream *_file;
      Buffer *_buffer;
      Palette *_palette;

      uint32 _width;
      uint32 _height;
      uint32 _paletteSize;
      Buffer::HowToSize _sizeBy;

      // PNG lib values
      int _bitDepth;
      png_structp _pngPtr;
      png_infop _infoPtr;
      int _colorType;
      uint32 _channels;

public:
      enum Status {
            OK,
            OUT_OF_MEMORY,
            BAD_FILE
      };

      PngLoader(Common::SeekableReadStream *file, Buffer &buffer, Palette &palette,
            Buffer::HowToSize sizeBy = Buffer::kSizeByTextureSize) :
                  _file(file), _buffer(&buffer), _palette(&palette),
                  _width(0), _height(0), _paletteSize(0),
                  _bitDepth(0), _sizeBy(sizeBy), _pngPtr(0), 
                  _infoPtr(0), _colorType(0), _channels(0) {}

      PngLoader::Status allocate();
      bool load();
};

#endif /* PSP_PNG_IMAGE_H */

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