+/* 2ooM: The Master of Orion II Reverse Engineering Project
+ * Library for working with LBX image files.
+ * Copyright (C) 2006-2008 Nick Bowler
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
uint16_t wtf1;
uint16_t frames, leadin;
uint16_t flags;
+ uint16_t palstart, palcount;
FILE *f;
- long foff;
+ long foff, paloff;
int currentframe;
int currentx, currenty;
unsigned char **framedata;
+ unsigned char **mask;
uint32_t offsets[];
};
tmp.leadin = letohs(tmp.leadin); tmp.foff += sizeof tmp.leadin;
tmp.flags = letohs(tmp.flags); tmp.foff += sizeof tmp.flags;
- /* Format constraints. */
- if (tmp.frames <= tmp.leadin) {
- lbx_errno = LBX_EFORMAT;
- return NULL;
- }
-
/*
* DEBUG ONLY. These assertions exist to catch otherwise valid image
* files which differ from what I believe to be true of all LBX images.
* assumptions.
*/
_lbx_assert(tmp.wtf1 == 0);
+ _lbx_assert(tmp.frames > tmp.leadin); /* cmbtshp.lbx breaks this. */
_lbx_assert(!(tmp.flags & ~(FLAG_PALETTE|FLAG_OVERWRITE|FLAG_LOOPING)));
new = malloc(sizeof *new + (tmp.frames+1) * sizeof *new->offsets);
goto readerr;
new->foff += sizeof *new->offsets * (new->frames+1);
+ if (new->flags & FLAG_PALETTE) {
+ if (fread(&new->palstart, sizeof new->palstart, 1, f) != 1)
+ goto readerr;
+ if (fread(&new->palcount, sizeof new->palcount, 1, f) != 1)
+ goto readerr;
+
+ new->palstart = letohs(new->palstart);
+ new->palcount = letohs(new->palcount);
+ new->foff += sizeof new->palstart + sizeof new->palcount;
+ new->paloff = new->foff;
+
+ if (new->palstart + new->palcount > 256) {
+ lbx_errno = LBX_EFORMAT;
+ free(new);
+ return NULL;
+ }
+ }
+
return new;
readerr:
if (feof(f)) {
size_t rc;
assert(img->framedata);
+ assert(img->mask);
if (fread(&type, sizeof type, 1, img->f) != 1) goto readerr;
type = letohs(type); img->foff += sizeof type;
return -1;
}
+ memset(&img->mask[img->currenty][img->currentx], 1, count);
+
pos = &img->framedata[img->currenty][img->currentx];
rc = fread(pos, 1, count, img->f);
img->currentx += rc;
return -1;
}
+static unsigned char **allocframebuffer(size_t width, size_t height)
+{
+ unsigned char **new, *tmp;
+ size_t i;
+
+ tmp = calloc(height, width);
+ if (!tmp) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ new = malloc(height * sizeof *new);
+ if (!new) {
+ lbx_errno = -errno;
+ free(tmp);
+ return NULL;
+ }
+
+ for (i = 0; i < height; i++) {
+ new[i] = tmp + i * width;
+ }
+
+ return new;
+}
+
unsigned char **lbximg_getframe(struct lbx_image *img, int frame)
{
if (frame >= img->frames || frame < 0) {
}
if (!img->framedata) {
- unsigned char *tmp;
- int i;
-
- tmp = malloc(img->width * img->height);
- if (!tmp) {
- lbx_errno = -errno;
+ img->framedata = allocframebuffer(img->width, img->height);
+ if (!img->framedata)
return NULL;
- }
+ }
- img->framedata = malloc(img->height * sizeof *img->framedata);
- if (!img->framedata) {
- lbx_errno = -errno;
- free(tmp);
+ if (!img->mask) {
+ img->mask = allocframebuffer(img->width, img->height);
+ if (!img->mask)
return NULL;
- }
-
- for (i = 0; i < img->height; i++) {
- img->framedata[i] = tmp + i * img->width;
- }
}
/* Start over if we are backtracking. */
if (img->flags & FLAG_OVERWRITE) {
/* Clear the slate. */
memset(img->framedata[0], 0, img->width * img->height);
+ memset(img->mask[0], 0, img->width * img->height);
} else {
/* We must have previous frame decoded to continue. */
if (frame > img->currentframe + 1) {
int
lbximg_getpalette(struct lbx_image *img, struct lbx_colour palette[static 256])
{
- size_t hdrlen = 6*(sizeof img->wtf1)+(img->frames+1)*(sizeof *img->offsets);
unsigned int i;
size_t rc;
- uint16_t start, count;
uint8_t entry[4];
/* Do nothing if the image doesn't have embedded palette data. */
if (!(img->flags & FLAG_PALETTE))
return 0;
- /* Palette data is located right after the header. */
- if (_lbx_fseek(img->f, &img->foff, hdrlen) == -1)
+ if (_lbx_fseek(img->f, &img->foff, img->paloff) == -1)
return -1;
- /* Palette header */
- if (fread(&start, sizeof start, 1, img->f) != 1) goto readerr;
- if (fread(&count, sizeof count, 1, img->f) != 1) goto readerr;
- start = letohs(start); img->foff += sizeof start;
- count = letohs(count); img->foff += sizeof count;
-
- if (start + count > 256) {
- lbx_errno = LBX_EFORMAT;
- return -1;
- }
-
- if (hdrlen + 2*sizeof start + count*sizeof entry > img->offsets[0]) {
- lbx_errno = LBX_EFORMAT;
- return -1;
- }
-
- for (i = 0; i < count; i++) {
+ for (i = 0; i < img->palcount; i++) {
rc = fread(entry, 1, sizeof entry, img->f);
img->foff += rc;
return -1;
}
- palette[start + i] = (struct lbx_colour){
+ palette[img->palstart + i] = (struct lbx_colour){
.red = entry[1] << 2,
.green = entry[2] << 2,
.blue = entry[3] << 2,
.width = img->width,
.height = img->height,
.nframes = img->frames,
- .haspalette = (_Bool)(img->flags & FLAG_PALETTE),
+ .palettesz = (img->flags & FLAG_PALETTE) ? img->palcount : 0,
};
/* There seems to be two ways of specifying that an image loops. */
}
}
+unsigned char **lbximg_getmask(struct lbx_image *img)
+{
+ return img->mask;
+}
+
void lbximg_close(struct lbx_image *img)
{
if (!img) return;
free(img->framedata);
}
+ if (img->mask) {
+ free(img->mask[0]);
+ free(img->mask);
+ }
+
if (img->f) {
fclose(img->f);
}
projects / liblbx.git / blobdiff