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src/Source/LibTIFF4/tif_jpeg.c  view on Meta::CPAN

#include <setjmp.h>

int TIFFFillStrip(TIFF* tif, uint32 strip);
int TIFFFillTile(TIFF* tif, uint32 tile);
int TIFFReInitJPEG_12( TIFF *tif, int scheme, int is_encode );

/* We undefine FAR to avoid conflict with JPEG definition */

#ifdef FAR
#undef FAR
#endif

/*
  Libjpeg's jmorecfg.h defines INT16 and INT32, but only if XMD_H is
  not defined.  Unfortunately, the MinGW and Borland compilers include
  a typedef for INT32, which causes a conflict.  MSVC does not include
  a conficting typedef given the headers which are included.
*/
#if defined(__BORLANDC__) || defined(__MINGW32__)
# define XMD_H 1
#endif

/*
   The windows RPCNDR.H file defines boolean, but defines it with the
   unsigned char size.  You should compile JPEG library using appropriate
   definitions in jconfig.h header, but many users compile library in wrong
   way. That causes errors of the following type:

   "JPEGLib: JPEG parameter struct mismatch: library thinks size is 432,
   caller expects 464"

   For such users we wil fix the problem here. See install.doc file from
   the JPEG library distribution for details.
*/

/* Define "boolean" as unsigned char, not int, per Windows custom. */
#if defined(__WIN32__) && !defined(__MINGW32__)
# ifndef __RPCNDR_H__            /* don't conflict if rpcndr.h already read */
   typedef unsigned char boolean;
# endif
# define HAVE_BOOLEAN            /* prevent jmorecfg.h from redefining it */
#endif

#include "../LibJPEG/jpeglib.h"
#include "../LibJPEG/jerror.h"

/* 
 * Do we want to do special processing suitable for when JSAMPLE is a
 * 16bit value?  
 */

#if defined(JPEG_LIB_MK1)
#  define JPEG_LIB_MK1_OR_12BIT 1
#elif BITS_IN_JSAMPLE == 12
#  define JPEG_LIB_MK1_OR_12BIT 1
#endif

/*
 * We are using width_in_blocks which is supposed to be private to
 * libjpeg. Unfortunately, the libjpeg delivered with Cygwin has
 * renamed this member to width_in_data_units.  Since the header has
 * also renamed a define, use that unique define name in order to
 * detect the problem header and adjust to suit.
 */
#if defined(D_MAX_DATA_UNITS_IN_MCU)
#define width_in_blocks width_in_data_units
#endif

/*
 * On some machines it may be worthwhile to use _setjmp or sigsetjmp
 * in place of plain setjmp.  These macros will make it easier.
 */
#define SETJMP(jbuf)		setjmp(jbuf)
#define LONGJMP(jbuf,code)	longjmp(jbuf,code)
#define JMP_BUF			jmp_buf

typedef struct jpeg_destination_mgr jpeg_destination_mgr;
typedef struct jpeg_source_mgr jpeg_source_mgr;
typedef struct jpeg_error_mgr jpeg_error_mgr;

/*
 * State block for each open TIFF file using
 * libjpeg to do JPEG compression/decompression.
 *
 * libjpeg's visible state is either a jpeg_compress_struct
 * or jpeg_decompress_struct depending on which way we
 * are going.  comm can be used to refer to the fields
 * which are common to both.
 *
 * NB: cinfo is required to be the first member of JPEGState,
 *     so we can safely cast JPEGState* -> jpeg_xxx_struct*
 *     and vice versa!
 */
typedef struct {
	union {
		struct jpeg_compress_struct c;
		struct jpeg_decompress_struct d;
		struct jpeg_common_struct comm;
	} cinfo;			/* NB: must be first */
	int             cinfo_initialized;

	jpeg_error_mgr	err;		/* libjpeg error manager */
	JMP_BUF		exit_jmpbuf;	/* for catching libjpeg failures */
	/*
	 * The following two members could be a union, but
	 * they're small enough that it's not worth the effort.
	 */
	jpeg_destination_mgr dest;	/* data dest for compression */
	jpeg_source_mgr	src;		/* data source for decompression */
					/* private state */
	TIFF*		tif;		/* back link needed by some code */
	uint16		photometric;	/* copy of PhotometricInterpretation */
	uint16		h_sampling;	/* luminance sampling factors */
	uint16		v_sampling;
	tmsize_t   	bytesperline;	/* decompressed bytes per scanline */
	/* pointers to intermediate buffers when processing downsampled data */
	JSAMPARRAY	ds_buffer[MAX_COMPONENTS];
	int		scancount;	/* number of "scanlines" accumulated */
	int		samplesperclump;

	TIFFVGetMethod	vgetparent;	/* super-class method */
	TIFFVSetMethod	vsetparent;	/* super-class method */