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/******************************************************************************
*
* Purpose: Implementation of the JPEG compression/decompression based
* on libjpeg. This implements functions suitable for use
* as jpeg interfaces in the PCIDSKInterfaces class.
*
******************************************************************************
* 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.
****************************************************************************/
#include "pcidsk_config.h"
#include "pcidsk_types.h"
#include "core/pcidsk_utils.h"
#include "pcidsk_exception.h"
#include <cassert>
#include <cstdio>
using namespace PCIDSK;
#if defined(HAVE_LIBJPEG)
extern "C" {
#include "jpeglib.h"
}
static void _DummyMgrMethod( j_compress_ptr /*pUnused*/ ) {}
static void _DummySrcMgrMethod( j_decompress_ptr /*pUnused*/ ) {}
/************************************************************************/
/* JpegError() */
/* */
/* Handle errors generated by the IJG library. We treat all */
/* errors as fatal at this point. Future handling may be */
/* improved by overriding other methods. */
/************************************************************************/
static void JpegError(j_common_ptr cinfo)
{
char buf[256];
cinfo->err->format_message(cinfo, buf);
ThrowPCIDSKException( "%s", buf );
}
/************************************************************************/
/* LibJPEG_DecompressBlock() */
/************************************************************************/
void PCIDSK::LibJPEG_DecompressBlock(
uint8 *src_data, int src_bytes, uint8 *dst_data, int dst_bytes,
int xsize, int ysize, eChanType pixel_type )
{
struct jpeg_decompress_struct sJCompInfo;
struct jpeg_source_mgr sSrcMgr;
struct jpeg_error_mgr sErrMgr;
int i;
/* -------------------------------------------------------------------- */
/* Setup the buffer we will compress into. We make it pretty */
/* big to ensure there is space. The calling function will */
/* free it as soon as it is done so this shouldn't hurt much. */
/* -------------------------------------------------------------------- */
sSrcMgr.init_source = _DummySrcMgrMethod;
sSrcMgr.fill_input_buffer = (boolean (*)(j_decompress_ptr))
_DummyMgrMethod;
sSrcMgr.skip_input_data = (void (*)(j_decompress_ptr, long))
_DummyMgrMethod;
sSrcMgr.resync_to_restart = jpeg_resync_to_restart;
sSrcMgr.term_source = _DummySrcMgrMethod;
sSrcMgr.next_input_byte = src_data;
sSrcMgr.bytes_in_buffer = src_bytes;
/* -------------------------------------------------------------------- */
/* Setup JPEG Decompression */
/* -------------------------------------------------------------------- */
jpeg_create_decompress(&sJCompInfo);
sJCompInfo.src = &sSrcMgr;
sJCompInfo.err = jpeg_std_error(&sErrMgr);
sJCompInfo.err->output_message = JpegError;
/* -------------------------------------------------------------------- */
/* Read the header. */
/* -------------------------------------------------------------------- */
jpeg_read_header( &sJCompInfo, TRUE );
if (sJCompInfo.image_width != (unsigned int)xsize ||
sJCompInfo.image_height != (unsigned int)ysize)
{
ThrowPCIDSKException("Tile Size wrong in LibJPEG_DecompressTile(), got %dx%d, expected %dx%d.",
sJCompInfo.image_width,
sJCompInfo.image_height,
xsize, ysize );
}
sJCompInfo.out_color_space = JCS_GRAYSCALE;
jpeg_start_decompress(&sJCompInfo);
/* -------------------------------------------------------------------- */
/* Read each of the scanlines. */
/* -------------------------------------------------------------------- */
for( i = 0; i < ysize; i++ )
{
uint8 *line_data = dst_data + i*xsize;
jpeg_read_scanlines( &sJCompInfo, (JSAMPARRAY) &line_data, 1 );
}
/* -------------------------------------------------------------------- */
/* Cleanup. */
/* -------------------------------------------------------------------- */
jpeg_finish_decompress( &sJCompInfo );
jpeg_destroy_decompress( &sJCompInfo );
}
/************************************************************************/
/* LibJPEG_CompressBlock() */
/************************************************************************/
void PCIDSK::LibJPEG_CompressBlock(
uint8 *src_data, int src_bytes, uint8 *dst_data, int &dst_bytes,
int xsize, int ysize, eChanType pixel_type, int quality )
{
struct jpeg_compress_struct sJCompInfo;
struct jpeg_destination_mgr sDstMgr;
struct jpeg_error_mgr sErrMgr;
int i;
/* -------------------------------------------------------------------- */
/* Setup the buffer we will compress into. */
/* -------------------------------------------------------------------- */
sDstMgr.next_output_byte = dst_data;
sDstMgr.free_in_buffer = dst_bytes;
sDstMgr.init_destination = _DummyMgrMethod;
sDstMgr.empty_output_buffer = (boolean (*)(j_compress_ptr))
_DummyMgrMethod;
sDstMgr.term_destination = _DummyMgrMethod;
/* -------------------------------------------------------------------- */
/* Setup JPEG Compression */
/* -------------------------------------------------------------------- */
jpeg_create_compress(&sJCompInfo);
sJCompInfo.dest = &sDstMgr;
sJCompInfo.err = jpeg_std_error(&sErrMgr);
sJCompInfo.err->output_message = JpegError;
sJCompInfo.image_width = xsize;
sJCompInfo.image_height = ysize;
sJCompInfo.input_components = 1;
sJCompInfo.in_color_space = JCS_GRAYSCALE;
jpeg_set_defaults(&sJCompInfo);
jpeg_set_quality(&sJCompInfo, quality, TRUE );
jpeg_start_compress(&sJCompInfo, TRUE );
/* -------------------------------------------------------------------- */
/* Write all the scanlines at once. */
/* -------------------------------------------------------------------- */
for( i = 0; i < ysize; i++ )
{
uint8 *pabyLine = src_data + i*xsize;
jpeg_write_scanlines( &sJCompInfo, (JSAMPARRAY)&pabyLine, 1 );
}
/* -------------------------------------------------------------------- */
/* Cleanup. */
/* -------------------------------------------------------------------- */
jpeg_finish_compress( &sJCompInfo );
dst_bytes = dst_bytes - sDstMgr.free_in_buffer;
jpeg_destroy_compress( &sJCompInfo );
}
#endif /* defined(HAVE_LIBJPEG) */
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