Category : C Source Code
Archive   : FRAC151S.ZIP
Filename : F16.C

 
Output of file : F16.C contained in archive : FRAC151S.ZIP

/**************************************
**
** F16.C : Code to read 16-bit fractal data sets. Uses
** strictly Targa16 type 10 files (run-length encoded 16-bit RGB).
*/

/* Lee Daniel Crocker CompuServe: 73407,2030 <== Preferred
** 1380 Jewett Ave. BIX: lcrocker
** Pittsburg, CA 94565 Usenet: ...!ames!pacbell!sactoh0!siva!lee
**
** This code is hereby placed in the public domain. You are free to
** use, modify, usurp, laugh at, destroy, or otherwise abuse it in any
** way you see fit.
**
** "If you steal from one author it's plagiarism; if you steal from
** many it's research." --Wilson Mizner
*/

/* 16 bit .tga files were generated for continuous potential "potfile"s
from version 9.? thru version 14. Replaced by double row gif type
file (.pot) in version 15. Delete this code after a few more revs.
The part which wrote 16 bit .tga files has already been deleted.
*/

#include
#include
#include
#include "port.h"
#include "targa_lc.h"

extern char rlebuf[258]; /* RLE-state variables */
static int state, count, bufp;

/**************************************
**
** Open previously saved Targa16 type 10 file filling in hs, vs, and
** csize with values in the header. If *csize is not zero, the block
** pointed to by cp is filled with the comment block. The caller
** _must_ allocate 256 bytes for this purpose before calling.
*/

FILE *t16_open(char *fname, int *hs, int *vs, int *csize, U8 *cp)
{
char filename[64];
U8 header[HEADERSIZE];
FILE *fp;

strcpy(filename, fname);
if (strchr(filename, '.') == NULL) strcat(filename, ".TGA");
if ((fp = fopen(filename, READMODE)) == NULL) return NULL;

fread(header, HEADERSIZE, 1, fp);
if ((header[O_FILETYPE] != T_RLERGB) || (header[O_ESIZE] != 16)) {
fclose(fp);
return NULL;
}
GET16(header[O_HSIZE], *hs);
GET16(header[O_VSIZE], *vs);
if (*csize = header[O_COMMENTLEN]) fread(cp, *csize, 1, fp);

state = count = bufp = 0;
return fp;
}

int t16_getline(FILE *fp, int hs, U16 *data)
{
int i;

for (i=0; i if (state == 0) {
bufp = 0;
if ((count = getc(fp)) > 127) {
state = 1;
count -= 127;
fread(rlebuf, 2, 1, fp);
} else {
state = 2;
++count;
fread(rlebuf, 2, count, fp);
}
}
GET16(rlebuf[bufp], data[i]);
if (--count == 0) state = 0;
if (state == 2) bufp += 2;
}
return 0;
}