mirror of https://github.com/GNOME/gimp.git
722 lines
19 KiB
C
722 lines
19 KiB
C
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/*
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* Written 1998 Jens Ch. Restemeier <jchrr@hrz.uni-bielefeld.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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* This code can be used to read and write FLI movies. It is currently
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* only used for the GIMP fli plug-in, but it can be used for other
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* programs, too.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fli.h"
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/*
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* To avoid endian-problems I wrote these functions:
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*/
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static unsigned char fli_read_char(FILE *f)
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{
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unsigned char b;
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fread(&b,1,1,f);
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return b;
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}
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static unsigned short fli_read_short(FILE *f)
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{
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unsigned char b[2];
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fread(&b,1,2,f);
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return (unsigned short)(b[1]<<8) | b[0];
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}
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static unsigned long fli_read_long(FILE *f)
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{
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unsigned char b[4];
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fread(&b,1,4,f);
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return (unsigned long)(b[3]<<24) | (b[2]<<16) | (b[1]<<8) | b[0];
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}
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static void fli_write_char(FILE *f, unsigned char b)
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{
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fwrite(&b,1,1,f);
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}
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static void fli_write_short(FILE *f, unsigned short w)
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{
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unsigned char b[2];
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b[0]=w&255;
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b[1]=(w>>8)&255;
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fwrite(&b,1,2,f);
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}
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static void fli_write_long(FILE *f, unsigned long l)
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{
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unsigned char b[4];
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b[0]=l&255;
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b[1]=(l>>8)&255;
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b[2]=(l>>16)&255;
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b[3]=(l>>24)&255;
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fwrite(&b,1,4,f);
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}
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void fli_read_header(FILE *f, s_fli_header *fli_header)
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{
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fli_header->filesize=fli_read_long(f); /* 0 */
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fli_header->magic=fli_read_short(f); /* 4 */
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fli_header->frames=fli_read_short(f); /* 6 */
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fli_header->width=fli_read_short(f); /* 8 */
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fli_header->height=fli_read_short(f); /* 10 */
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fli_header->depth=fli_read_short(f); /* 12 */
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fli_header->flags=fli_read_short(f); /* 14 */
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if (fli_header->magic == HEADER_FLI) {
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/* FLI saves speed in 1/70s */
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fli_header->speed=fli_read_short(f)*14; /* 16 */
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} else {
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if (fli_header->magic == HEADER_FLC) {
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/* FLC saves speed in 1/1000s */
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fli_header->speed=fli_read_long(f); /* 16 */
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} else {
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fprintf(stderr, "error: magic number is wrong !\n");
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fli_header->magic = NO_HEADER;
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}
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}
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}
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void fli_write_header(FILE *f, s_fli_header *fli_header)
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{
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fli_header->filesize=ftell(f);
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fseek(f, 0, SEEK_SET);
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fli_write_long(f, fli_header->filesize); /* 0 */
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fli_write_short(f, fli_header->magic); /* 4 */
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fli_write_short(f, fli_header->frames); /* 6 */
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fli_write_short(f, fli_header->width); /* 8 */
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fli_write_short(f, fli_header->height); /* 10 */
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fli_write_short(f, fli_header->depth); /* 12 */
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fli_write_short(f, fli_header->flags); /* 14 */
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if (fli_header->magic == HEADER_FLI) {
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/* FLI saves speed in 1/70s */
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fli_write_short(f, fli_header->speed / 14); /* 16 */
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} else {
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if (fli_header->magic == HEADER_FLC) {
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/* FLC saves speed in 1/1000s */
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fli_write_long(f, fli_header->speed); /* 16 */
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fseek(f, 80, SEEK_SET);
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fli_write_long(f, fli_header->oframe1); /* 80 */
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fli_write_long(f, fli_header->oframe2); /* 84 */
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} else {
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fprintf(stderr, "error: magic number in header is wrong !\n");
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}
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}
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}
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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)
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{
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s_fli_frame fli_frame;
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unsigned long framepos;
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int c;
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framepos=ftell(f);
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fli_frame.size=fli_read_long(f);
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fli_frame.magic=fli_read_short(f);
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fli_frame.chunks=fli_read_short(f);
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if (fli_frame.magic == FRAME) {
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fseek(f, framepos+16, SEEK_SET);
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for (c=0;c<fli_frame.chunks;c++) {
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s_fli_chunk chunk;
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unsigned long chunkpos;
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chunkpos = ftell(f);
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chunk.size=fli_read_long(f);
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chunk.magic=fli_read_short(f);
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switch (chunk.magic) {
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case FLI_COLOR: fli_read_color(f, fli_header, old_cmap, cmap); break;
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case FLI_COLOR_2: fli_read_color_2(f, fli_header, old_cmap, cmap); break;
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case FLI_BLACK: fli_read_black(f, fli_header, framebuf); break;
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case FLI_BRUN: fli_read_brun(f, fli_header, framebuf); break;
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case FLI_COPY: fli_read_copy(f, fli_header, framebuf); break;
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case FLI_LC: fli_read_lc(f, fli_header, old_framebuf, framebuf); break;
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case FLI_LC_2: fli_read_lc_2(f, fli_header, old_framebuf, framebuf); break;
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case FLI_MINI: /* unused, skip */ break;
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default: /* unknown, skip */ break;
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}
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if (chunk.size & 1) chunk.size++;
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fseek(f,chunkpos+chunk.size,SEEK_SET);
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}
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} /* else: unknown, skip */
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fseek(f, framepos+fli_frame.size, SEEK_SET);
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}
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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)
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{
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s_fli_frame fli_frame;
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unsigned long framepos, frameend;
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framepos=ftell(f);
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fseek(f, framepos+16, SEEK_SET);
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switch (fli_header->frames) {
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case 0: fli_header->oframe1=framepos; break;
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case 1: fli_header->oframe2=framepos; break;
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}
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fli_frame.size=0;
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fli_frame.magic=FRAME;
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fli_frame.chunks=0;
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/*
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* create color chunk
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*/
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if (fli_header->magic == HEADER_FLI) {
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if (fli_write_color(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
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} else {
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if (fli_header->magic == HEADER_FLC) {
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if (fli_write_color_2(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
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} else {
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fprintf(stderr, "error: magic number in header is wrong !\n");
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}
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}
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#if 0
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if (codec_mask & W_COLOR) {
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if (fli_write_color(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
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}
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if (codec_mask & W_COLOR_2) {
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if (fli_write_color_2(f, fli_header, old_cmap, cmap)) fli_frame.chunks++;
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}
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#endif
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/* create bitmap chunk */
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if (old_framebuf==NULL) {
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fli_write_brun(f, fli_header, framebuf);
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} else {
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fli_write_lc(f, fli_header, old_framebuf, framebuf);
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}
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fli_frame.chunks++;
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frameend=ftell(f);
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fli_frame.size=frameend-framepos;
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fseek(f, framepos, SEEK_SET);
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fli_write_long(f, fli_frame.size);
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fli_write_short(f, fli_frame.magic);
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fli_write_short(f, fli_frame.chunks);
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fseek(f, frameend, SEEK_SET);
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fli_header->frames++;
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}
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/*
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* palette chunks from the classical Autodesk Animator.
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*/
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void fli_read_color(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
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{
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unsigned short num_packets, cnt_packets, col_pos;
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col_pos=0;
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num_packets=fli_read_short(f);
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for (cnt_packets=num_packets; cnt_packets>0; cnt_packets--) {
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unsigned short skip_col, num_col, col_cnt;
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skip_col=fli_read_char(f);
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num_col=fli_read_char(f);
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if (num_col==0) {
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for (col_pos=0; col_pos<768; col_pos++) {
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cmap[col_pos]=fli_read_char(f)<<2;
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}
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return;
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}
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for (col_cnt=skip_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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}
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for (col_cnt=num_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
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cmap[col_pos++]=fli_read_char(f)<<2;
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cmap[col_pos++]=fli_read_char(f)<<2;
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cmap[col_pos++]=fli_read_char(f)<<2;
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}
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}
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}
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int fli_write_color(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
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{
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unsigned long chunkpos;
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unsigned short num_packets;
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s_fli_chunk chunk;
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chunkpos=ftell(f);
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fseek(f, chunkpos+8, SEEK_SET);
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num_packets=0;
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if (old_cmap==NULL) {
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unsigned short col_pos;
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num_packets=1;
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fli_write_char(f, 0); /* skip no color */
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fli_write_char(f, 0); /* 256 color */
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for (col_pos=0; col_pos<768; col_pos++) {
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fli_write_char(f, cmap[col_pos]>>2);
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}
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} else {
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unsigned short num_packets, cnt_skip, cnt_col, col_pos, col_start;
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num_packets=0; col_pos=0;
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do {
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cnt_skip=0;
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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])) {
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cnt_skip++; col_pos++;
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}
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col_start=col_pos;
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cnt_col=0;
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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]))) {
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cnt_col++; col_pos++;
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}
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if (cnt_col>0) {
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num_packets++;
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fli_write_char(f, cnt_skip & 255);
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fli_write_char(f, cnt_col & 255);
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while (cnt_col>0) {
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fli_write_char(f, cmap[col_start++]>>2);
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fli_write_char(f, cmap[col_start++]>>2);
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fli_write_char(f, cmap[col_start++]>>2);
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cnt_col--;
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}
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}
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} while (col_pos<256);
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}
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if (num_packets>0) {
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chunk.size=ftell(f)-chunkpos;
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chunk.magic=FLI_COLOR;
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fseek(f, chunkpos, SEEK_SET);
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fli_write_long(f, chunk.size);
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fli_write_short(f, chunk.magic);
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fli_write_short(f, num_packets);
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if (chunk.size & 1) chunk.size++;
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fseek(f,chunkpos+chunk.size,SEEK_SET);
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return 1;
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}
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fseek(f,chunkpos, SEEK_SET);
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return 0;
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}
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/*
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* palette chunks from Autodesk Animator pro
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*/
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void fli_read_color_2(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
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{
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unsigned short num_packets, cnt_packets, col_pos;
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num_packets=fli_read_short(f);
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col_pos=0;
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for (cnt_packets=num_packets; cnt_packets>0; cnt_packets--) {
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unsigned short skip_col, num_col, col_cnt;
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skip_col=fli_read_char(f);
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num_col=fli_read_char(f);
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if (num_col == 0) {
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for (col_pos=0; col_pos<768; col_pos++) {
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cmap[col_pos]=fli_read_char(f);
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}
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return;
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}
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for (col_cnt=skip_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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cmap[col_pos]=old_cmap[col_pos];col_pos++;
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}
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for (col_cnt=num_col; (col_cnt>0) && (col_pos<768); col_cnt--) {
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cmap[col_pos++]=fli_read_char(f);
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cmap[col_pos++]=fli_read_char(f);
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cmap[col_pos++]=fli_read_char(f);
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}
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}
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}
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int fli_write_color_2(FILE *f, s_fli_header *fli_header, unsigned char *old_cmap, unsigned char *cmap)
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{
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unsigned long chunkpos;
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unsigned short num_packets;
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s_fli_chunk chunk;
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chunkpos=ftell(f);
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fseek(f, chunkpos+8, SEEK_SET);
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num_packets=0;
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if (old_cmap==NULL) {
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unsigned short col_pos;
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num_packets=1;
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fli_write_char(f, 0); /* skip no color */
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fli_write_char(f, 0); /* 256 color */
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for (col_pos=0; col_pos<768; col_pos++) {
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fli_write_char(f, cmap[col_pos]);
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}
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} else {
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unsigned short num_packets, cnt_skip, cnt_col, col_pos, col_start;
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num_packets=0; col_pos=0;
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do {
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cnt_skip=0;
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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])) {
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cnt_skip++; col_pos++;
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}
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col_start=col_pos;
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cnt_col=0;
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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]))) {
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cnt_col++; col_pos++;
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}
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if (cnt_col>0) {
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num_packets++;
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fli_write_char(f, cnt_skip);
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fli_write_char(f, cnt_col);
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for (; cnt_col>0; cnt_col--) {
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fli_write_char(f, cmap[col_start++]);
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fli_write_char(f, cmap[col_start++]);
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fli_write_char(f, cmap[col_start++]);
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}
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}
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} while (col_pos<256);
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}
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if (num_packets>0) {
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chunk.size=ftell(f)-chunkpos;
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chunk.magic=FLI_COLOR_2;
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fseek(f, chunkpos, SEEK_SET);
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fli_write_long(f, chunk.size);
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fli_write_short(f, chunk.magic);
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fli_write_short(f, num_packets);
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if (chunk.size & 1) chunk.size++;
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fseek(f,chunkpos+chunk.size,SEEK_SET);
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return 1;
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}
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fseek(f,chunkpos, SEEK_SET);
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return 0;
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}
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/*
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* completely black frame
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*/
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void fli_read_black(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
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{
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memset(framebuf, 0, fli_header->width * fli_header->height);
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}
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void fli_write_black(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
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{
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s_fli_chunk chunk;
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chunk.size=6;
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chunk.magic=FLI_BLACK;
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fli_write_long(f, chunk.size);
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fli_write_short(f, chunk.magic);
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}
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/*
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* Uncompressed frame
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*/
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void fli_read_copy(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
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{
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fread(framebuf, fli_header->width, fli_header->height, f);
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}
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void fli_write_copy(FILE *f, s_fli_header *fli_header, unsigned char *framebuf)
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{
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unsigned long chunkpos;
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s_fli_chunk chunk;
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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++;
|
|
}
|
|
}
|