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/* This header file (i_rle.h) defines the external interface to the module
i_rle.c, which does run-length encoding on a sequence of integers
("pixel values"), and writes the resulting encoded sequence to an output
stream. The encoded sequence should be GIF-compatible, even though the
compression technique is not LZW.
The module encapsulates the miGIF compression routines, originally
written by der Mouse and ivo. Their copyright notice appears in
i_rle.c. */
/* an `int' should be able to hold 2**GIFBITS distinct values, together
with -1 */
#define GIFBITS 12
/* the RLE output structure */
typedef struct
{
int rl_pixel;
int rl_basecode;
int rl_count;
int rl_table_pixel;
int rl_table_max;
bool just_cleared;
int out_bits;
int out_bits_init;
int out_count;
int out_bump;
int out_bump_init;
int out_clear;
int out_clear_init;
int max_ocodes;
int code_clear;
int code_eof;
unsigned int obuf;
int obits;
FILE *ofile;
#ifdef LIBPLOTTER
ostream *outstream;
#endif
unsigned char oblock[256];
int oblen;
} rle_out;
/* create, initialize, and return a new RLE output structure */
#ifdef LIBPLOTTER
extern rle_out *_rle_init ____P((FILE *fp, ostream *out, int bit_depth));
#else
extern rle_out *_rle_init ____P((FILE *fp, int bit_depth));
#endif
/* write a single integer (pixel) to the structure */
extern void _rle_do_pixel ____P((rle_out *rle, int c));
/* wind things up and deallocate the RLE output structure */
extern void _rle_terminate ____P((rle_out *rle));
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