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/******************************************************************************
* $Id: tif_ovrcache.h,v 1.1 2000/01/28 15:03:32 warmerda Exp $
*
* Project: TIFF Overview Builder
* Purpose: Library functions to maintain two rows of tiles or two strips
* of data for output overviews as an output cache.
* Author: Frank Warmerdam, warmerda@home.com
*
* This code could potentially be used by other applications wanting to
* manage a once-through write cache.
*
******************************************************************************
* Copyright (c) 2000, Frank Warmerdam
*
* 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.
******************************************************************************
*
* $Log: tif_ovrcache.h,v $
* Revision 1.1 2000/01/28 15:03:32 warmerda
* New
*
*/
#ifndef TIF_OVRCACHE_H_INCLUDED
#define TIF_OVRCACHE_H_INCLUDED
typedef struct
{
uint32 nXSize;
uint32 nYSize;
uint32 nBlockXSize;
uint32 nBlockYSize;
uint16 nBitsPerPixel;
uint16 nSamples;
int nBytesPerBlock;
int nBlocksPerRow;
int nBlocksPerColumn;
int nBlockOffset; /* what block is the first in papabyBlocks? */
unsigned char *pabyRow1Blocks;
unsigned char *pabyRow2Blocks;
int nDirOffset;
TIFF *hTIFF;
int bTiled;
} TIFFOvrCache;
TIFFOvrCache *TIFFCreateOvrCache( TIFF *hTIFF, int nDirOffset );
unsigned char *TIFFGetOvrBlock( TIFFOvrCache *, int, int, int );
void TIFFDestroyOvrCache( TIFFOvrCache * );
#endif /* ndef TIF_OVRCACHE_H_INCLUDED */
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