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rle.h
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C/C++ Source or Header
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1991-05-20
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5KB
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194 lines
/*
* This software is copyrighted as noted below. It may be freely copied,
* modified, and redistributed, provided that the copyright notice is
* preserved on all copies.
*
* There is no warranty or other guarantee of fitness for this software,
* it is provided solely "as is". Bug reports or fixes may be sent
* to the author, who may or may not act on them as he desires.
*
* You may not include this software in a program or other software product
* without supplying the source, or without informing the end-user that the
* source is available for no extra charge.
*
* If you modify this software, you should include a notice giving the
* name of the person performing the modification, the date of modification,
* and the reason for such modification.
*/
/*
* svfb_global.h - externally visible variables for svfb.
*
* Author: Todd W. Fuqua
* Computer Science Dept.
* University of Utah
* Date: Sun Jul 29 1984
* Copyright (c) 1984 Todd W. Fuqua
*
* Added optimised dither square size globals
* 88/07/13 Graeme W. Gill
*/
enum sv_dispatch {
RUN_DISPATCH
};
/* some compilers have problems converting unsigned bytes to float */
#define BYTEBUG
/* On BIGENDIAN machines swap the bytes. Everything but vax's and
* pdp-11's (not sure if it's pdp11 or PDP11 ??)
* are considered BIGENDIAN machines.
*/
#define SWAB(val) (val= memToValLSB((byte *)&val, sizeof(val)))
/* fix up some bezerklysims */
#ifndef bzero
# define bzero(xx,yy) memset((char *)(xx),0,(int)(yy))
#endif
#ifndef bcopy
# define bcopy(xx,yy,zz) memcpy((char *)(yy),(char *)(xx),(int)(zz))
#endif
/* ****************************************************************
* TAG( rle_pixel rle_map )
*
* Typedef for 8-bit (or less) pixel data.
*
* Typedef for 16-bit color map data.
*/
typedef unsigned char rle_pixel;
typedef unsigned short rle_map;
/*
* Defines for traditional channel numbers
*/
#define SV_RED 0 /* red channel traditionally here */
#define SV_GREEN 1 /* green channel traditionally here */
#define SV_BLUE 2 /* blue channel traditionally here */
#define SV_ALPHA -1 /* Alpha channel here */
/*
* Return values from rle_get_setup
*/
#define RLE_SUCCESS 0
#define RLE_NOT_RLE -1
#define RLE_NO_SPACE -2
#define RLE_EMPTY -3
#define RLE_EOF -4
/*
* TAG( sv_globals )
*
* Definition of "globals" structure used by RLE routines
*/
extern struct sv_globals {
enum sv_dispatch sv_dispatch; /* type of file to create */
int sv_ncolors, /* number of color channels */
* sv_bg_color, /* pointer to bg color vector */
sv_alpha, /* if !0, save alpha channel */
sv_background, /* (background) 0->just save pixels, */
/* 1->overlay, 2->clear to bg first */
sv_xmin, /* lower X bound (left) */
sv_xmax, /* upper X bound (right) */
sv_ymin, /* lower Y bound (bottom) */
sv_ymax, /* upper Y bound (top) */
sv_ncmap, /* number of color channels in color map */
/* map only saved if != 0 */
sv_cmaplen; /* log2 of color map length */
rle_map * sv_cmap; /* pointer to color map array */
char ** sv_comments; /* pointer to array of pointers to comments */
ZFILE * svfb_fd; /* output file */
/*
* Bit map of channels to read/save. Indexed by (channel mod 256).
* Alpha channel sets bit 255.
*
* Indexing (0 <= c <= 255):
* sv_bits[c/8] & (1 << (c%8))
*/
#define SV_SET_BIT(glob,bit) \
((glob).sv_bits[((bit)&0xff)/8] |= (1<<((bit)&0x7)))
#define SV_CLR_BIT(glob,bit) \
((glob).sv_bits[((bit)&0xff)/8] &= ~(1<<((bit)&0x7)))
#define SV_BIT(glob,bit) \
((glob).sv_bits[((bit)&0xff)/8] & (1<<((bit)&0x7)))
char sv_bits[256/8];
/*
* Local storage for rle_getrow & sv_putrow.
* rle_getrow has
* scan_y int current Y scanline
* vert_skip int number of lines to skip
* sv_putrow has
* nblank int number of blank lines
* brun short(*)[2] Array of background runs.
* fileptr long Position in output file.
*/
union {
struct {
int scan_y,
vert_skip;
char is_eof, /* Set when EOF or EofOp encountered */
is_seek; /* If true, can seek input file */
} get;
struct {
int nblank;
short (*brun)[2];
long fileptr;
} put;
} sv_private;
} sv_globals;
/*
* buildmap - build a more usable colormap from data in globals struct.
*/
extern rle_pixel **
buildmap();
/* ( globals, minmap, gamma )
* struct sv_globals * globals;
* int minmap;
* double gamma;
*/
/*
* rle_getcom - get a specific comment from the image comments.
*/
extern char *
rle_getcom();
/* ( name, globals )
* char * name;
* struct sv_globals * globals;
*/
/*
* rle_putcom - put (or replace) a comment into the image comments.
*/
extern char *
rle_putcom();
/* ( value, globals )
* char * value;
* struct sv_globals * globals;
*/
/*
* rle_delcom - delete a specific comment from the image comments.
*/
extern char *
rle_delcom();
/* ( name, globals )
* char * name;
* struct sv_globals * globals;
*/
/*
* dither globals
*/
extern int dith_levels; /* target effective number of levels, default = 128 */
extern int dith_np2; /* set non-zero to use non-power_of_2 matrix size */
extern int dith_size; /* effective size of the dither matrix chosen */