13 |
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#include "platform.h" |
14 |
|
#include "color.h" |
15 |
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#include "resolu.h" |
16 |
+ |
#include "clrtab.h" |
17 |
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|
18 |
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#define MAXCOLORS 256 |
19 |
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|
22 |
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int bmap[MAXCOLORS]; |
23 |
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|
24 |
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int currow; |
24 |
– |
|
25 |
– |
extern long ftell(); |
26 |
– |
|
25 |
|
long picstart; |
26 |
+ |
uby8 clrtab[256][3]; |
27 |
|
|
29 |
– |
BYTE clrtab[256][3]; |
30 |
– |
|
28 |
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extern int samplefac; |
29 |
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|
33 |
– |
extern int getgifpix(); |
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|
31 |
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COLR *scanln; |
32 |
< |
BYTE *pixscan; |
32 |
> |
uby8 *pixscan; |
33 |
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|
34 |
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int xmax, ymax; /* picture size */ |
39 |
– |
|
35 |
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double gamv = 2.2; /* gamma correction */ |
41 |
– |
|
36 |
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int greyscale = 0; /* convert to B&W? */ |
43 |
– |
|
37 |
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int dither = 1; /* dither colors? */ |
45 |
– |
|
38 |
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int bradj = 0; /* brightness adjustment */ |
47 |
– |
|
39 |
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int ncolors = 0; /* number of colors requested */ |
40 |
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|
41 |
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char *progname; |
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|
43 |
+ |
typedef int ifun_t(int x, int y); /* required by the GIF code below */ |
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|
45 |
< |
main(argc, argv) |
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< |
int argc; |
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< |
char *argv[]; |
45 |
> |
static void getrow(int y); |
46 |
> |
static void mkclrmap(int nc); |
47 |
> |
static void mkgrymap(int nc); |
48 |
> |
static ifun_t getgifpix; |
49 |
> |
|
50 |
> |
static void GIFEncode(FILE *fp, int GWidth, int GHeight, int GInterlace, |
51 |
> |
int Background, int BitsPerPixel, int Red[], int Green[], int Blue[], |
52 |
> |
ifun_t* GetPixel); |
53 |
> |
|
54 |
> |
|
55 |
> |
int |
56 |
> |
main(int argc, char *argv[]) |
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{ |
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int bitsperpix; |
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int i; |
140 |
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} |
141 |
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|
142 |
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|
143 |
< |
getrow(y) /* get the specified row from our image */ |
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< |
int y; |
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> |
static void |
144 |
> |
getrow( /* get the specified row from our image */ |
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> |
int y |
146 |
> |
) |
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{ |
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if (y == currow) |
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return; |
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|
} |
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|
172 |
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|
173 |
< |
mkclrmap(nc) /* make our color map */ |
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< |
int nc; |
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> |
static void |
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> |
mkclrmap( /* make our color map */ |
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> |
int nc |
176 |
> |
) |
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{ |
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register int i; |
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|
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gmap[i] = clrtab[i][GRN]; |
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bmap[i] = clrtab[i][BLU]; |
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} |
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< |
if (dither && (pixscan = (BYTE *)malloc(xmax)) == NULL) |
198 |
> |
if (dither && (pixscan = (uby8 *)malloc(xmax)) == NULL) |
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goto memerr; |
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return; |
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memerr: |
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} |
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|
206 |
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|
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< |
mkgrymap(nc) |
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< |
int nc; |
207 |
> |
static void |
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> |
mkgrymap( |
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> |
int nc |
210 |
> |
) |
211 |
|
{ |
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register int i; |
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|
|
219 |
|
} |
220 |
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|
221 |
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|
222 |
< |
int |
223 |
< |
getgifpix(x, y) /* get a single pixel from our picture */ |
224 |
< |
int x, y; |
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> |
static int |
223 |
> |
getgifpix( /* get a single pixel from our picture */ |
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> |
int x, |
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> |
int y |
226 |
> |
) |
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|
{ |
219 |
– |
int pix; |
220 |
– |
|
228 |
|
getrow(y); |
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if (greyscale) |
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return((normbright(scanln[x])*ncolors)>>8); |
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|
* SCARY GIF code follows . . . . sorry. |
239 |
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* |
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|
* Based on GIFENCOD by David Rowley <[email protected]>.A |
241 |
< |
* Lempel-Zim compression based on "compress". |
241 |
> |
* Lempel-Ziv compression based on "compress". |
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* |
243 |
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*/ |
244 |
|
|
250 |
|
* BitsPerPixel, Red, Green, Blue, GetPixel ) |
251 |
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* |
252 |
|
*****************************************************************************/ |
246 |
– |
typedef int (* ifunptr)(); |
253 |
|
|
254 |
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#define TRUE 1 |
255 |
|
#define FALSE 0 |
262 |
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unsigned long cur_accum = 0; |
263 |
|
int cur_bits = 0; |
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|
265 |
+ |
static void BumpPixel(void); |
266 |
+ |
static int GIFNextPixel(ifun_t* getpixel); |
267 |
+ |
static void Putword(int w, FILE *fp); |
268 |
+ |
static void compress(int init_bits, FILE *outfile, ifun_t* ReadValue); |
269 |
+ |
|
270 |
+ |
|
271 |
+ |
/* a code_int must be able to hold 2**CBITS values of type int, and also -1 */ |
272 |
+ |
typedef int code_int; |
273 |
+ |
typedef long int count_int; |
274 |
+ |
typedef unsigned char char_type; |
275 |
+ |
|
276 |
+ |
static void output(code_int code); |
277 |
+ |
static void cl_block(void); |
278 |
+ |
static void cl_hash(count_int hsize); |
279 |
+ |
static void writeerr(void); |
280 |
+ |
|
281 |
+ |
static void char_init(void); |
282 |
+ |
static void char_out(int c); |
283 |
+ |
static void flush_char(void); |
284 |
+ |
static void gammawarp(short *sbuf, float gam, int n); |
285 |
+ |
|
286 |
+ |
|
287 |
|
/* |
288 |
|
* Bump the 'curx' and 'cury' to point to the next pixel |
289 |
|
*/ |
290 |
< |
BumpPixel() |
290 |
> |
static void |
291 |
> |
BumpPixel(void) |
292 |
|
{ |
293 |
|
curx++; |
294 |
|
if( curx == Width ) { |
329 |
|
/* |
330 |
|
* Return the next pixel from the image |
331 |
|
*/ |
332 |
< |
GIFNextPixel( getpixel ) |
333 |
< |
ifunptr getpixel; |
332 |
> |
static int |
333 |
> |
GIFNextPixel( |
334 |
> |
ifun_t* getpixel |
335 |
> |
) |
336 |
|
{ |
337 |
|
int r; |
338 |
|
|
347 |
|
/* |
348 |
|
* public GIFEncode |
349 |
|
*/ |
350 |
< |
GIFEncode( fp, GWidth, GHeight, GInterlace, Background, |
351 |
< |
BitsPerPixel, Red, Green, Blue, GetPixel ) |
352 |
< |
FILE *fp; |
353 |
< |
int GWidth, GHeight; |
354 |
< |
int GInterlace; |
355 |
< |
int Background; |
356 |
< |
int BitsPerPixel; |
357 |
< |
int Red[], Green[], Blue[]; |
358 |
< |
ifunptr GetPixel; |
350 |
> |
static void |
351 |
> |
GIFEncode( |
352 |
> |
FILE *fp, |
353 |
> |
int GWidth, |
354 |
> |
int GHeight, |
355 |
> |
int GInterlace, |
356 |
> |
int Background, |
357 |
> |
int BitsPerPixel, |
358 |
> |
int Red[], |
359 |
> |
int Green[], |
360 |
> |
int Blue[], |
361 |
> |
ifun_t* GetPixel |
362 |
> |
) |
363 |
|
{ |
364 |
|
int B; |
365 |
|
int RWidth, RHeight; |
369 |
|
int InitCodeSize; |
370 |
|
int i; |
371 |
|
|
372 |
< |
long cur_accum = 0; |
372 |
> |
cur_accum = 0; /* globals */ |
373 |
|
cur_bits = 0; |
374 |
|
|
375 |
|
Interlace = GInterlace; |
419 |
|
/* |
420 |
|
* Write out a word to the GIF file |
421 |
|
*/ |
422 |
< |
Putword( w, fp ) |
423 |
< |
int w; |
424 |
< |
FILE *fp; |
422 |
> |
static void |
423 |
> |
Putword( |
424 |
> |
int w, |
425 |
> |
FILE *fp |
426 |
> |
) |
427 |
|
{ |
428 |
|
fputc( w & 0xff, fp ); |
429 |
|
fputc( (w/256) & 0xff, fp ); |
443 |
|
#define HSIZE 5003 /* 80% occupancy */ |
444 |
|
|
445 |
|
/* |
409 |
– |
* a code_int must be able to hold 2**CBITS values of type int, and also -1 |
410 |
– |
*/ |
411 |
– |
typedef int code_int; |
412 |
– |
typedef long int count_int; |
413 |
– |
typedef unsigned char char_type; |
414 |
– |
|
415 |
– |
/* |
446 |
|
* |
447 |
|
* GIF Image compression - modified 'compress' |
448 |
|
* |
517 |
|
int ClearCode; |
518 |
|
int EOFCode; |
519 |
|
|
520 |
< |
compress( init_bits, outfile, ReadValue ) |
521 |
< |
int init_bits; |
522 |
< |
FILE *outfile; |
523 |
< |
ifunptr ReadValue; |
520 |
> |
static void |
521 |
> |
compress( |
522 |
> |
int init_bits, |
523 |
> |
FILE *outfile, |
524 |
> |
ifun_t* ReadValue |
525 |
> |
) |
526 |
|
{ |
527 |
|
register long fcode; |
528 |
|
register code_int i = 0; |
561 |
|
while ( (c = GIFNextPixel( ReadValue )) != EOF ) { |
562 |
|
in_count++; |
563 |
|
fcode = (long) (((long) c << maxbits) + ent); |
564 |
< |
/* i = (((code_int)c << hshift) ~ ent); /* xor hashing */ |
564 |
> |
/* i = (((code_int)c << hshift) ~ ent); */ /* xor hashing */ |
565 |
|
i = (((code_int)c << hshift) ^ ent); /* xor hashing */ |
566 |
|
if ( HashTabOf (i) == fcode ) { |
567 |
|
ent = CodeTabOf (i); |
621 |
|
0x01FF, 0x03FF, 0x07FF, 0x0FFF, |
622 |
|
0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF }; |
623 |
|
|
624 |
< |
output( code ) |
625 |
< |
code_int code; |
624 |
> |
static void |
625 |
> |
output( |
626 |
> |
code_int code |
627 |
> |
) |
628 |
|
{ |
629 |
|
cur_accum &= masks[ cur_bits ]; |
630 |
|
if( cur_bits > 0 ) |
673 |
|
/* |
674 |
|
* Clear out the hash table |
675 |
|
*/ |
676 |
< |
cl_block () /* table clear for block compress */ |
676 |
> |
static void |
677 |
> |
cl_block (void) /* table clear for block compress */ |
678 |
|
{ |
679 |
|
cl_hash ( (count_int) hsize ); |
680 |
|
free_ent = ClearCode + 2; |
682 |
|
output( (code_int)ClearCode ); |
683 |
|
} |
684 |
|
|
685 |
< |
cl_hash(hsize) /* reset code table */ |
686 |
< |
register count_int hsize; |
685 |
> |
static void |
686 |
> |
cl_hash( /* reset code table */ |
687 |
> |
register count_int hsize |
688 |
> |
) |
689 |
|
{ |
690 |
|
register count_int *htab_p = htab+hsize; |
691 |
|
register long i; |
715 |
|
*--htab_p = m1; |
716 |
|
} |
717 |
|
|
718 |
< |
writeerr() |
718 |
> |
static void |
719 |
> |
writeerr(void) |
720 |
|
{ |
721 |
|
printf( "error writing output file\n" ); |
722 |
|
exit(1); |
736 |
|
/* |
737 |
|
* Set up the 'byte output' routine |
738 |
|
*/ |
739 |
< |
char_init() |
739 |
> |
static void |
740 |
> |
char_init(void) |
741 |
|
{ |
742 |
|
a_count = 0; |
743 |
|
} |
751 |
|
* Add a character to the end of the current packet, and if it is 254 |
752 |
|
* characters, flush the packet to disk. |
753 |
|
*/ |
754 |
< |
char_out( c ) |
755 |
< |
int c; |
754 |
> |
static void |
755 |
> |
char_out( |
756 |
> |
int c |
757 |
> |
) |
758 |
|
{ |
759 |
|
accum[ a_count++ ] = c; |
760 |
|
if( a_count >= 254 ) |
764 |
|
/* |
765 |
|
* Flush the packet to disk, and reset the accumulator |
766 |
|
*/ |
767 |
< |
flush_char() |
767 |
> |
static void |
768 |
> |
flush_char(void) |
769 |
|
{ |
770 |
|
if( a_count > 0 ) { |
771 |
|
fputc( a_count, g_outfile ); |
777 |
|
static float curgamma; |
778 |
|
static short gamtab[256]; |
779 |
|
|
780 |
< |
gammawarp(sbuf,gam,n) |
781 |
< |
short *sbuf; |
782 |
< |
float gam; |
783 |
< |
int n; |
780 |
> |
static void |
781 |
> |
gammawarp( |
782 |
> |
short *sbuf, |
783 |
> |
float gam, |
784 |
> |
int n |
785 |
> |
) |
786 |
|
{ |
787 |
|
int i; |
744 |
– |
float f; |
788 |
|
|
789 |
|
if(gam!=curgamma) { |
790 |
|
for(i=0; i<256; i++) |