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/******************************************************************************
*
* Purpose: Declaration of the CTiledChannel raster access strategy
*
******************************************************************************
* Copyright (c) 2009
* PCI Geomatics, 50 West Wilmot Street, Richmond Hill, Ont, Canada
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef __INCLUDE_CHANNEL_CTILEDCHANNEL_H
#define __INCLUDE_CHANNEL_CTILEDCHANNEL_H
#include "pcidsk_config.h"
#include "pcidsk_types.h"
#include "pcidsk_buffer.h"
#include "channel/cpcidskchannel.h"
#include <vector>
#include <string>
namespace PCIDSK
{
class SysVirtualFile;
/************************************************************************/
/* CTiledChannel */
/* */
/* Internal tiled data stored in special tiled imagery */
/* segments. Imagery may be compressed. */
/************************************************************************/
class CTiledChannel : public CPCIDSKChannel
{
public:
CTiledChannel( PCIDSKBuffer &image_header,
uint64 ih_offset,
PCIDSKBuffer &file_header,
int channelnum,
CPCIDSKFile *file,
eChanType pixel_type );
virtual ~CTiledChannel();
virtual int GetBlockWidth() const;
virtual int GetBlockHeight() const;
virtual int GetWidth() const;
virtual int GetHeight() const;
virtual eChanType GetType() const;
virtual int ReadBlock( int block_index, void *buffer,
int xoff=-1, int yoff=-1,
int xsize=-1, int ysize=-1 );
virtual int WriteBlock( int block_index, void *buffer );
virtual void Synchronize();
private:
int image;
mutable int tile_count;
mutable int tiles_per_row;
mutable int tiles_per_col;
mutable SysVirtualFile *vfile;
mutable std::string compression;
void EstablishAccess() const;
void RLEDecompressBlock( PCIDSKBuffer &oCompressed,
PCIDSKBuffer &oDecompressed );
void RLECompressBlock( PCIDSKBuffer &oUncompressed,
PCIDSKBuffer &oCompressed );
void JPEGDecompressBlock( PCIDSKBuffer &oCompressed,
PCIDSKBuffer &oDecompressed );
void JPEGCompressBlock( PCIDSKBuffer &oDecompressed,
PCIDSKBuffer &oCompressed );
bool IsTileEmpty(void* buffer) const;
// managed paged list of tile offsets and sizes.
void GetTileInfo( int tile_index,
uint64 &offset, int &size );
void SetTileInfo( int tile_index,
uint64 offset, int size );
void LoadTileInfoBlock( int tile_info_block );
void SaveTileInfoBlock( int tile_info_block );
static const int tile_block_size = 4096;
mutable std::vector< std::vector<uint64> > tile_offsets;
mutable std::vector< std::vector<int> > tile_sizes;
mutable std::vector<bool> tile_info_dirty;
};
} // end namespace PCIDSK
#endif // __INCLUDE_CHANNEL_CTILEDCHANNEL_H
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