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-
- /*
- * Written 1998 Jens Ch. Restemeier <jchrr@hrz.uni-bielefeld.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
- /*
- * This code can be used to read and write FLI movies. It is currently
- * only used for the GIMP fli plug-in, but it can be used for other
- * programs, too.
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include "fli.h"
-
- /*
- * To avoid endian-problems I wrote these functions:
- */
- static unsigned char fli_read_char(FILE *f)
- {
- unsigned char b;
- fread(&b,1,1,f);
- return b;
- }
-
- static unsigned short fli_read_short(FILE *f)
- {
- unsigned char b[2];
- fread(&b,1,2,f);
- return (unsigned short)(b[1]<<8) | b[0];
- }
-
- static unsigned long fli_read_long(FILE *f)
- {
- unsigned char b[4];
- fread(&b,1,4,f);
- return (unsigned long)(b[3]<<24) | (b[2]<<16) | (b[1]<<8) | b[0];
- }
-
- static void fli_write_char(FILE *f, unsigned char b)
- {
- fwrite(&b,1,1,f);
- }
-
- static void fli_write_short(FILE *f, unsigned short w)
- {
- unsigned char b[2];
- b[0]=w&255;
- b[1]=(w>>8)&255;
- fwrite(&b,1,2,f);
- }
-
- static void fli_write_long(FILE *f, unsigned long l)
- {
- unsigned char b[4];
- b[0]=l&255;
- b[1]=(l>>8)&255;
- b[2]=(l>>16)&255;
- b[3]=(l>>24)&255;
- fwrite(&b,1,4,f);
- }
-
- void fli_read_header(FILE *f, s_fli_header *fli_header)
- {
- fli_header->filesize=fli_read_long(f); /* 0 */
- fli_header->magic=fli_read_short(f); /* 4 */
- fli_header->frames=fli_read_short(f); /* 6 */
- fli_header->width=fli_read_short(f); /* 8 */
- fli_header->height=fli_read_short(f); /* 10 */
- fli_header->depth=fli_read_short(f); /* 12 */
- fli_header->flags=fli_read_short(f); /* 14 */
- if (fli_header->magic == HEADER_FLI) {
- /* FLI saves speed in 1/70s */
- fli_header->speed=fli_read_short(f)*14; /* 16 */
- } else {
- if (fli_header->magic == HEADER_FLC) {
- /* FLC saves speed in 1/1000s */
- fli_header->speed=fli_read_long(f); /* 16 */
- } else {
- fprintf(stderr, "error: magic number is wrong !\n");
- fli_header->magic = NO_HEADER;
- }
- }
- }
-
- void fli_write_header(FILE *f, s_fli_header *fli_header)
- {
- fli_header->filesize=ftell(f);
- fseek(f, 0, SEEK_SET);
- fli_write_long(f, fli_header->filesize); /* 0 */
- fli_write_short(f, fli_header->magic); /* 4 */
- fli_write_short(f, fli_header->frames); /* 6 */
- fli_write_short(f, fli_header->width); /* 8 */
- fli_write_short(f, fli_header->height); /* 10 */
- fli_write_short(f, fli_header->depth); /* 12 */
- fli_write_short(f, fli_header->flags); /* 14 */
- if (fli_header->magic == HEADER_FLI) {
- /* FLI saves speed in 1/70s */
- fli_write_short(f, fli_header->speed / 14); /* 16 */
- } else {
- if (fli_header->magic == HEADER_FLC) {
- /* FLC saves speed in 1/1000s */
- fli_write_long(f, fli_header->speed); /* 16 */
- fseek(f, 80, SEEK_SET);
- fli_write_long(f, fli_header->oframe1); /* 80 */
- fli_write_long(f, fli_header->oframe2); /* 84 */
- } else {
- fprintf(stderr, "error: magic number in header is wrong !\n");
- }
- }
- }
-
- void fli_read_frame(FILE *f, s_fli_header *fli_header, unsigned char *old_framebuf, unsigned char *old_cmap, unsigned char *framebuf, unsigned char *cmap)
- {
- s_fli_frame fli_frame;
- unsigned long framepos;
- int c;
- framepos=ftell(f);
-
- fli_frame.size=fli_read_long(f);
- fli_frame.magic=fli_read_short(f);
- fli_frame.chunks=fli_read_short(f);
-
- if (fli_frame.magic == FRAME) {
- fseek(f, framepos+16, SEEK_SET);
- for (c=0;c<fli_frame.chunks;c++) {
- s_fli_chunk chunk;
- unsigned long chunkpos;
- chunkpos = ftell(f);
- chunk.size=fli_read_long(f);
- chunk.magic=fli_read_short(f);
- switch (chunk.magic) {
- case FLI_COLOR: fli_read_color(f, fli_header, old_cmap, cmap); break;
- case FLI_COLOR_2: fli_read_color_2(f, fli_header, old_cmap, cmap); break;
- case FLI_BLACK: fli_read_black(f, fli_header, framebuf); break;
- case FLI_BRUN: fli_read_brun(f, fli_header, framebuf); break;
- case FLI_COPY: fli_read_copy(f, fli_header, framebuf); break;
- case FLI_LC: fli_read_lc(f, fli_header, old_framebuf, framebuf); break;
- case FLI_LC_2: fli_read_lc_2(f, fli_header, old_framebuf, framebuf); break;
- case FLI_MINI: /* unused, skip */ break;
- default: /* unknown, skip */ break;
- }
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- }
- } /* else: unknown, skip */
- fseek(f, framepos+fli_frame.size, SEEK_SET);
- }
-
- void fli_write_frame(FILE *f, s_fli_header *fli_header, unsigned char *old_framebuf, unsigned char *old_cmap, unsigned char *framebuf, unsigned char *cmap, unsigned short codec_mask)
- {
- s_fli_frame fli_frame;
- unsigned long framepos, frameend;
- framepos=ftell(f);
- fseek(f, framepos+16, SEEK_SET);
-
- switch (fli_header->frames) {
- case 0: fli_header->oframe1=framepos; break;
- case 1: fli_header->oframe2=framepos; break;
- }
-
- fli_frame.size=0;
- fli_frame.magic=FRAME;
- fli_frame.chunks=0;
-
- /*
- * create color chunk
- */
- if (fli_header->magic == HEADER_FLI) {
- if (fli_write_color(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
- } else {
- if (fli_header->magic == HEADER_FLC) {
- if (fli_write_color_2(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
- } else {
- fprintf(stderr, "error: magic number in header is wrong !\n");
- }
- }
-
- #if 0
- if (codec_mask & W_COLOR) {
- if (fli_write_color(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
- }
- if (codec_mask & W_COLOR_2) {
- if (fli_write_color_2(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
- }
- #endif
- /* create bitmap chunk */
- if (old_framebuf==NULL) {
- fli_write_brun(f, fli_header, framebuf);
- } else {
- fli_write_lc(f, fli_header, old_framebuf, framebuf);
- }
- fli_frame.chunks++;
-
- frameend=ftell(f);
- fli_frame.size=frameend-framepos;
- fseek(f, framepos, SEEK_SET);
- fli_write_long(f, fli_frame.size);
- fli_write_short(f, fli_frame.magic);
- fli_write_short(f, fli_frame.chunks);
- fseek(f, frameend, SEEK_SET);
- fli_header->frames++;
- }
-
- /*
- * palette chunks from the classical Autodesk Animator.
- */
- void fli_read_color(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
- {
- unsigned short num_packets, cnt_packets, col_pos;
- col_pos=0;
- num_packets=fli_read_short(f);
- for (cnt_packets=num_packets; cnt_packets>0; cnt_packets--) {
- unsigned short skip_col, num_col, col_cnt;
- skip_col=fli_read_char(f);
- num_col=fli_read_char(f);
- if (num_col==0) {
- for (col_pos=0; col_pos<768; col_pos++) {
- cmap[col_pos]=fli_read_char(f)<<2;
- }
- return;
- }
- for (col_cnt=skip_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- }
- for (col_cnt=num_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
- cmap[col_pos++]=fli_read_char(f)<<2;
- cmap[col_pos++]=fli_read_char(f)<<2;
- cmap[col_pos++]=fli_read_char(f)<<2;
- }
- }
- }
-
- int fli_write_color(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
- {
- unsigned long chunkpos;
- unsigned short num_packets;
- s_fli_chunk chunk;
- chunkpos=ftell(f);
- fseek(f, chunkpos+8, SEEK_SET);
- num_packets=0;
- if (old_cmap==NULL) {
- unsigned short col_pos;
- num_packets=1;
- fli_write_char(f, 0); /* skip no color */
- fli_write_char(f, 0); /* 256 color */
- for (col_pos=0; col_pos<768; col_pos++) {
- fli_write_char(f, cmap[col_pos]>>2);
- }
- } else {
- unsigned short num_packets, cnt_skip, cnt_col, col_pos, col_start;
- num_packets=0; col_pos=0;
- do {
- cnt_skip=0;
- while ((col_pos<256) && (old_cmap[col_pos*3+0]==cmap[col_pos*3+0]) && (old_cmap[col_pos*3+1]==cmap[col_pos*3+1]) && (old_cmap[col_pos*3+2]==cmap[col_pos*3+2])) {
- cnt_skip++; col_pos++;
- }
- col_start=col_pos;
- cnt_col=0;
- while ((col_pos<256) && !((old_cmap[col_pos*3+0]==cmap[col_pos*3+0]) && (old_cmap[col_pos*3+1]==cmap[col_pos*3+1]) && (old_cmap[col_pos*3+2]==cmap[col_pos*3+2]))) {
- cnt_col++; col_pos++;
- }
- if (cnt_col>0) {
- num_packets++;
- fli_write_char(f, cnt_skip & 255);
- fli_write_char(f, cnt_col & 255);
- while (cnt_col>0) {
- fli_write_char(f, cmap[col_start++]>>2);
- fli_write_char(f, cmap[col_start++]>>2);
- fli_write_char(f, cmap[col_start++]>>2);
- cnt_col--;
- }
- }
- } while (col_pos<256);
- }
-
- if (num_packets>0) {
- chunk.size=ftell(f)-chunkpos;
- chunk.magic=FLI_COLOR;
-
- fseek(f, chunkpos, SEEK_SET);
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
- fli_write_short(f, num_packets);
-
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- return 1;
- }
- fseek(f,chunkpos, SEEK_SET);
- return 0;
- }
-
- /*
- * palette chunks from Autodesk Animator pro
- */
- void fli_read_color_2(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
- {
- unsigned short num_packets, cnt_packets, col_pos;
- num_packets=fli_read_short(f);
- col_pos=0;
- for (cnt_packets=num_packets; cnt_packets>0; cnt_packets--) {
- unsigned short skip_col, num_col, col_cnt;
- skip_col=fli_read_char(f);
- num_col=fli_read_char(f);
- if (num_col == 0) {
- for (col_pos=0; col_pos<768; col_pos++) {
- cmap[col_pos]=fli_read_char(f);
- }
- return;
- }
- for (col_cnt=skip_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- cmap[col_pos]=old_cmap[col_pos];col_pos++;
- }
- for (col_cnt=num_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
- cmap[col_pos++]=fli_read_char(f);
- cmap[col_pos++]=fli_read_char(f);
- cmap[col_pos++]=fli_read_char(f);
- }
- }
- }
-
- int fli_write_color_2(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
- {
- unsigned long chunkpos;
- unsigned short num_packets;
- s_fli_chunk chunk;
- chunkpos=ftell(f);
- fseek(f, chunkpos+8, SEEK_SET);
- num_packets=0;
- if (old_cmap==NULL) {
- unsigned short col_pos;
- num_packets=1;
- fli_write_char(f, 0); /* skip no color */
- fli_write_char(f, 0); /* 256 color */
- for (col_pos=0; col_pos<768; col_pos++) {
- fli_write_char(f, cmap[col_pos]);
- }
- } else {
- unsigned short num_packets, cnt_skip, cnt_col, col_pos, col_start;
- num_packets=0; col_pos=0;
- do {
- cnt_skip=0;
- while ((col_pos<256) && (old_cmap[col_pos*3+0]==cmap[col_pos*3+0]) && (old_cmap[col_pos*3+1]==cmap[col_pos*3+1]) && (old_cmap[col_pos*3+2]==cmap[col_pos*3+2])) {
- cnt_skip++; col_pos++;
- }
- col_start=col_pos;
- cnt_col=0;
- while ((col_pos<256) && !((old_cmap[col_pos*3+0]==cmap[col_pos*3+0]) && (old_cmap[col_pos*3+1]==cmap[col_pos*3+1]) && (old_cmap[col_pos*3+2]==cmap[col_pos*3+2]))) {
- cnt_col++; col_pos++;
- }
- if (cnt_col>0) {
- num_packets++;
- fli_write_char(f, cnt_skip);
- fli_write_char(f, cnt_col);
- for (; cnt_col>0; cnt_col--) {
- fli_write_char(f, cmap[col_start++]);
- fli_write_char(f, cmap[col_start++]);
- fli_write_char(f, cmap[col_start++]);
- }
- }
- } while (col_pos<256);
- }
-
- if (num_packets>0) {
- chunk.size=ftell(f)-chunkpos;
- chunk.magic=FLI_COLOR_2;
-
- fseek(f, chunkpos, SEEK_SET);
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
- fli_write_short(f, num_packets);
-
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- return 1;
- }
- fseek(f,chunkpos, SEEK_SET);
- return 0;
- }
-
- /*
- * completely black frame
- */
- void fli_read_black(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
- memset(framebuf, 0, fli_header->width * fli_header->height);
- }
-
- void fli_write_black(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
- s_fli_chunk chunk;
-
- chunk.size=6;
- chunk.magic=FLI_BLACK;
-
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
- }
-
- /*
- * Uncompressed frame
- */
- void fli_read_copy(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
- fread(framebuf, fli_header->width, fli_header->height, f);
- }
-
- void fli_write_copy(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
-
- unsigned long chunkpos;
- s_fli_chunk chunk;
- chunkpos=ftell(f);
- fseek(f, chunkpos+6, SEEK_SET);
- fwrite(framebuf, fli_header->width, fli_header->height, f);
- chunk.size=ftell(f)-chunkpos;
- chunk.magic=FLI_COPY;
-
- fseek(f, chunkpos, SEEK_SET);
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
-
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- }
-
- /*
- * This is a RLE algorithm, used for the first image of an animation
- */
- void fli_read_brun(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
- unsigned short yc;
- unsigned char *pos;
- for (yc=0; yc < fli_header->height; yc++) {
- unsigned short xc, pc, pcnt;
- pc=fli_read_char(f);
- xc=0;
- pos=framebuf+(fli_header->width * yc);
- for (pcnt=pc; pcnt>0; pcnt--) {
- unsigned short ps;
- ps=fli_read_char(f);
- if (ps & 0x80) {
- unsigned short len;
- for (len=-(signed char)ps; len>0; len--) {
- pos[xc++]=fli_read_char(f);
- }
- } else {
- unsigned char val;
- val=fli_read_char(f);
- memset(&(pos[xc]), val, ps);
- xc+=ps;
- }
- }
- }
- }
-
- void fli_write_brun(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
- {
- unsigned long chunkpos;
- s_fli_chunk chunk;
- unsigned short yc;
- unsigned char *linebuf;
-
- chunkpos=ftell(f);
- fseek(f, chunkpos+6, SEEK_SET);
-
- for (yc=0; yc < fli_header->height; yc++) {
- unsigned short xc, t1, pc, tc;
- unsigned long linepos, lineend, bc;
- linepos=ftell(f); bc=0;
- fseek(f, 1, SEEK_CUR);
- linebuf=framebuf + (yc*fli_header->width);
- xc=0; tc=0; t1=0;
- while (xc < fli_header->width) {
- pc=1;
- while ((pc<120) && ((xc+pc)<fli_header->width) && (linebuf[xc+pc] == linebuf[xc])) {
- pc++;
- }
- if (pc>2) {
- if (tc>0) {
- bc++;
- fli_write_char(f, (tc-1)^0xFF);
- fwrite(linebuf+t1, 1, tc, f);
- tc=0;
- }
- bc++;
- fli_write_char(f, pc);
- fli_write_char(f, linebuf[xc]);
- t1=xc+pc;
- } else {
- tc+=pc;
- if (tc>120) {
- bc++;
- fli_write_char(f, (tc-1)^0xFF);
- fwrite(linebuf+t1, 1, tc, f);
- tc=0;
- t1=xc+pc;
- }
- }
- xc+=pc;
- }
- if (tc>0) {
- bc++;
- fli_write_char(f, (tc-1)^0xFF);
- fwrite(linebuf+t1, 1, tc, f);
- tc=0;
- }
- lineend=ftell(f);
- fseek(f, linepos, SEEK_SET);
- fli_write_char(f, bc);
- fseek(f, lineend, SEEK_SET);
- }
-
- chunk.size=ftell(f)-chunkpos;
- chunk.magic=FLI_BRUN;
-
- fseek(f, chunkpos, SEEK_SET);
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
-
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- }
-
- /*
- * This is the delta-compression method from the classic Autodesk Animator.
- * It's basically the RLE method from above, but it allows to skip unchanged
- * lines at the beginning and end of an image, and unchanged pixels in a line
- * This chunk is used in FLI files.
- */
- void fli_read_lc(FILE *f, s_fli_header *fli_header, unsigned char *old_framebuf, unsigned char *framebuf)
- {
- unsigned short yc, firstline, numline;
- unsigned char *pos;
- memcpy(framebuf, old_framebuf, fli_header->width * fli_header->height);
- firstline = fli_read_short(f);
- numline = fli_read_short(f);
- for (yc=0; yc < numline; yc++) {
- unsigned short xc, pc, pcnt;
- pc=fli_read_char(f);
- xc=0;
- pos=framebuf+(fli_header->width * (firstline+yc));
- for (pcnt=pc; pcnt>0; pcnt--) {
- unsigned short ps,skip;
- skip=fli_read_char(f);
- ps=fli_read_char(f);
- xc+=skip;
- if (ps & 0x80) {
- unsigned char val;
- ps=-(signed char)ps;
- val=fli_read_char(f);
- memset(&(pos[xc]), val, ps);
- xc+=ps;
- } else {
- fread(&(pos[xc]), ps, 1, f);
- xc+=ps;
- }
- }
- }
- }
-
- void fli_write_lc(FILE *f, s_fli_header *fli_header, unsigned char *old_framebuf, unsigned char *framebuf)
- {
- unsigned long chunkpos;
- s_fli_chunk chunk;
- unsigned short yc, firstline, numline, lastline;
- unsigned char *linebuf, *old_linebuf;
-
- chunkpos=ftell(f);
- fseek(f, chunkpos+6, SEEK_SET);
-
- /* first check, how many lines are unchanged at the beginning */
- firstline=0;
- while ((memcmp(old_framebuf+(firstline*fli_header->width), framebuf+(firstline*fli_header->width), fli_header->width)==0) && (firstline<fli_header->height)) firstline++;
-
- /* then check from the end, how many lines are unchanged */
- if (firstline<fli_header->height) {
- lastline=fli_header->height-1;
- while ((memcmp(old_framebuf+(lastline*fli_header->width), framebuf+(lastline*fli_header->width), fli_header->width)==0) && (lastline>firstline)) lastline--;
- numline=(lastline-firstline)+1;
- } else {
- numline=0;
- }
- if (numline==0) firstline=0;
-
- fli_write_short(f, firstline);
- fli_write_short(f, numline);
-
- for (yc=0; yc < numline; yc++) {
- unsigned short xc, sc, cc, tc;
- unsigned long linepos, lineend, bc;
- linepos=ftell(f); bc=0;
- fseek(f, 1, SEEK_CUR);
-
- linebuf=framebuf + ((firstline+yc)*fli_header->width);
- old_linebuf=old_framebuf + ((firstline+yc)*fli_header->width);
- xc=0;
- while (xc < fli_header->width) {
- sc=0;
- while ((linebuf[xc]==old_linebuf[xc]) && (xc<fli_header->width) && (sc<255)) {
- xc++; sc++;
- }
- fli_write_char(f, sc);
- cc=1;
- while ((linebuf[xc]==linebuf[xc+cc]) && ((xc+cc)<fli_header->width) && (cc<120)) {
- cc++;
- }
- if (cc>2) {
- bc++;
- fli_write_char(f, (cc-1)^0xFF);
- fli_write_char(f, linebuf[xc]);
- xc+=cc;
- } else {
- tc=0;
- do {
- sc=0;
- while ((linebuf[tc+xc+sc]==old_linebuf[tc+xc+sc]) && ((tc+xc+sc)<fli_header->width) && (sc<5)) {
- sc++;
- }
- cc=1;
- while ((linebuf[tc+xc]==linebuf[tc+xc+cc]) && ((tc+xc+cc)<fli_header->width) && (cc<10)) {
- cc++;
- }
- tc++;
- } while ((tc<120) && (cc<9) && (sc<4) && ((xc+tc)<fli_header->width));
- bc++;
- fli_write_char(f, tc);
- fwrite(linebuf+xc, tc, 1, f);
- xc+=tc;
- }
- }
- lineend=ftell(f);
- fseek(f, linepos, SEEK_SET);
- fli_write_char(f, bc);
- fseek(f, lineend, SEEK_SET);
- }
-
- chunk.size=ftell(f)-chunkpos;
- chunk.magic=FLI_LC;
-
- fseek(f, chunkpos, SEEK_SET);
- fli_write_long(f, chunk.size);
- fli_write_short(f, chunk.magic);
-
- if (chunk.size & 1) chunk.size++;
- fseek(f,chunkpos+chunk.size,SEEK_SET);
- }
-
-
- /*
- * This is an enhanced version of the old delta-compression used by
- * the autodesk animator pro. It's word-oriented, and allows to skip
- * larger parts of the image. This chunk is used in FLC files.
- */
- void fli_read_lc_2(FILE *f, s_fli_header *fli_header, unsigned char *old_framebuf, unsigned char *framebuf)
- {
- unsigned short yc, lc, numline;
- unsigned char *pos;
- memcpy(framebuf, old_framebuf, fli_header->width * fli_header->height);
- yc=0;
- numline = fli_read_short(f);
- for (lc=0; lc < numline; lc++) {
- unsigned short xc, pc, pcnt, lpf, lpn;
- pc=fli_read_short(f);
- lpf=0; lpn=0;
- while (pc & 0x8000) {
- if (pc & 0x4000) {
- yc+=-(signed short)pc;
- } else {
- lpf=1;lpn=pc&0xFF;
- }
- pc=fli_read_short(f);
- }
- xc=0;
- pos=framebuf+(fli_header->width * yc);
- for (pcnt=pc; pcnt>0; pcnt--) {
- unsigned short ps,skip;
- skip=fli_read_char(f);
- ps=fli_read_char(f);
- xc+=skip;
- if (ps & 0x80) {
- unsigned char v1,v2;
- ps=-(signed char)ps;
- v1=fli_read_char(f);
- v2=fli_read_char(f);
- while (ps>0) {
- pos[xc++]=v1;
- pos[xc++]=v2;
- ps--;
- }
- } else {
- fread(&(pos[xc]), ps, 2, f);
- xc+=ps << 1;
- }
- }
- if (lpf) pos[xc]=lpn;
- yc++;
- }
- }
-