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-rw-r--r--plug-ins/file-fli/fli.c1033
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diff --git a/plug-ins/file-fli/fli.c b/plug-ins/file-fli/fli.c
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+++ b/plug-ins/file-fli/fli.c
@@ -0,0 +1,1033 @@
+
+/*
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * 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 "config.h"
+
+#include <glib/gstdio.h>
+
+#include <string.h>
+#include <stdio.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;
+ }
+ }
+
+ if (fli_header->width == 0)
+ fli_header->width = 320;
+
+ if (fli_header->height == 0)
+ fli_header->height = 200;
+}
+
+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 cnt_skip, cnt_col, col_pos, col_start;
+
+ 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 * 3;
+ 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 cnt_skip, cnt_col, col_pos, col_start;
+ 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 * 3;
+ 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);
+
+ while (cnt_col > 0)
+ {
+ fli_write_char (f, cmap[col_start++]);
+ fli_write_char (f, cmap[col_start++]);
+ fli_write_char (f, cmap[col_start++]);
+ cnt_col--;
+ }
+ }
+ } 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 pc, pcnt;
+ size_t n, xc;
+
+ pc = fli_read_char (f);
+ xc = 0;
+ pos = framebuf + (fli_header->width * yc);
+ n = (size_t) fli_header->width * (fli_header->height - 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 && xc < n; len--)
+ {
+ pos[xc++] = fli_read_char (f);
+ }
+ }
+ else
+ {
+ unsigned char val;
+ size_t len;
+
+ len = MIN (n - xc, ps);
+ val = fli_read_char (f);
+ memset (&(pos[xc]), val, len);
+ xc+=len;
+ }
+ }
+ }
+}
+
+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
+ * supports skipping 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);
+ if (numline > fli_header->height || fli_header->height - numline < firstline)
+ return;
+
+ for (yc = 0; yc < numline; yc++)
+ {
+ unsigned short pc, pcnt;
+ size_t n, xc;
+
+ pc = fli_read_char (f);
+ xc = 0;
+ pos = framebuf + (fli_header->width * (firstline + yc));
+ n = (size_t) fli_header->width * (fli_header->height - firstline - yc);
+ for (pcnt = pc; pcnt > 0; pcnt--)
+ {
+ unsigned short ps, skip;
+
+ skip = fli_read_char (f);
+ ps = fli_read_char (f);
+ xc+=MIN (n - xc, skip);
+ if (ps & 0x80)
+ {
+ unsigned char val;
+ size_t len;
+ ps = -(signed char) ps;
+ val = fli_read_char (f);
+ len = MIN (n - xc, ps);
+ memset (&(pos[xc]), val, len);
+ xc+=len;
+ }
+ else
+ {
+ size_t len;
+ len = MIN (n - xc, ps);
+ fread (&(pos[xc]), len, 1, f);
+ xc+=len;
+ }
+ }
+ }
+}
+
+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 supports
+ * skipping 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 pc, pcnt, lpf, lpn;
+ size_t n, xc;
+
+ 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);
+ }
+ yc = MIN (yc, fli_header->height);
+ xc = 0;
+ pos = framebuf + (fli_header->width * yc);
+ n = (size_t) fli_header->width * (fli_header->height - yc);
+ for (pcnt = pc; pcnt > 0; pcnt--)
+ {
+ unsigned short ps, skip;
+
+ skip = fli_read_char (f);
+ ps = fli_read_char (f);
+ xc += MIN (n - 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 && xc + 1 < n)
+ {
+ pos[xc++] = v1;
+ pos[xc++] = v2;
+ ps--;
+ }
+ }
+ else
+ {
+ size_t len;
+
+ len = MIN ((n - xc)/2, ps);
+ fread (&(pos[xc]), len, 2, f);
+ xc += len << 1;
+ }
+ }
+ if (lpf)
+ pos[xc] = lpn;
+ yc++;
+ }
+}