X-Git-Url: https://git.draconx.ca/gitweb/liblbx.git/blobdiff_plain/0806586ee10e29b60a77c351d355a00087f81f57..ff5bd81012bba4202487c9a5bf7649bd63ca4bae:/src/image.c?ds=sidebyside
diff --git a/src/image.c b/src/image.c
index 86f6f98..3043861 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1,40 +1,76 @@
+/*
+ * 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 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 .
+ */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include
#include
+#include
#include
#include
-#include "lbx.h"
#include "byteorder.h"
+#include "misc.h"
+#include "lbx.h"
+#include "image.h"
+
+#define FLAG_OVERWRITE 0x0400 /* Draw each frame on a clean slate (unsure). */
+#define FLAG_PALETTE 0x1000 /* Image contains embedded palette. */
+#define FLAG_LOOPING 0x2000 /* Loop over all frames in the image (unsure). */
struct lbx_image {
- FILE *f;
uint16_t width, height;
- uint16_t wtf1, wtf2;
- uint16_t offs, frames;
+ uint16_t wtf1;
+ uint16_t frames, leadin;
+ uint16_t flags;
+ uint16_t palstart, palcount;
+
+ FILE *f;
+ long foff, paloff;
+
+ int currentframe;
+ int currentx, currenty;
+ unsigned char **framedata;
+ unsigned char **mask;
+
uint32_t offsets[];
};
struct lbx_image *lbximg_fopen(FILE *f)
{
- struct lbx_image tmp = {.f = f}, *new;
+ struct lbx_image tmp = {.f = f}, *new = NULL;
+ size_t rc;
if (fread(&tmp.width, sizeof tmp.width, 1, f) != 1) goto readerr;
if (fread(&tmp.height, sizeof tmp.height, 1, f) != 1) goto readerr;
if (fread(&tmp.wtf1, sizeof tmp.wtf1, 1, f) != 1) goto readerr;
- if (fread(&tmp.offs, sizeof tmp.offs, 1, f) != 1) goto readerr;
if (fread(&tmp.frames, sizeof tmp.frames, 1, f) != 1) goto readerr;
- if (fread(&tmp.wtf2, sizeof tmp.wtf2, 1, f) != 1) goto readerr;
+ if (fread(&tmp.leadin, sizeof tmp.leadin, 1, f) != 1) goto readerr;
+ if (fread(&tmp.flags, sizeof tmp.flags, 1, f) != 1) goto readerr;
- tmp.width = letohs(tmp.width);
- tmp.height = letohs(tmp.height);
- tmp.wtf1 = letohs(tmp.wtf1);
- tmp.offs = letohs(tmp.offs);
- tmp.frames = letohs(tmp.frames);
- tmp.wtf2 = letohs(tmp.wtf2);
+ tmp.width = letohs(tmp.width); tmp.foff += sizeof tmp.width;
+ tmp.height = letohs(tmp.height); tmp.foff += sizeof tmp.height;
+ tmp.wtf1 = letohs(tmp.wtf1); tmp.foff += sizeof tmp.wtf1;
+ tmp.frames = letohs(tmp.frames); tmp.foff += sizeof tmp.frames;
+ tmp.leadin = letohs(tmp.leadin); tmp.foff += sizeof tmp.leadin;
+ tmp.flags = letohs(tmp.flags); tmp.foff += sizeof tmp.flags;
/*
* DEBUG ONLY. These assertions exist to catch otherwise valid image
@@ -42,19 +78,41 @@ struct lbx_image *lbximg_fopen(FILE *f)
* If we never find any exceptions, we can replace the assertions with
* assumptions.
*/
- assert(tmp.wtf1 == 0);
- assert(tmp.offs == tmp.frames + 1);
+ _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.offs * sizeof *new->offsets);
+ new = malloc(sizeof *new + (tmp.frames+1) * sizeof *new->offsets);
if (!new) {
lbx_errno = -errno;
return NULL;
}
*new = tmp;
+ new->currentframe = -1;
- if (fread(new->offsets, sizeof *new->offsets, new->offs, f) != new->offs)
+ rc = fread(new->offsets, sizeof *new->offsets, new->frames+1, f);
+ if (rc < new->frames+1)
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:
@@ -68,10 +126,278 @@ readerr:
return NULL;
}
+static int _lbx_drawrow(int first, struct lbx_image *img)
+{
+ uint16_t type, yval, count, xval;
+ unsigned char *pos;
+ unsigned char abyss;
+ 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;
+
+ if (first) {
+ img->currentx = 0;
+ img->currenty = 0;
+ type = 0;
+ }
+
+ if (type == 0) {
+ if (fread(&yval, sizeof yval, 1, img->f) != 1) goto readerr;
+ yval = letohs(yval); img->foff += sizeof yval;
+ if (yval == 1000)
+ return 1;
+ if (fread(&count, sizeof count, 1, img->f) != 1) goto readerr;
+ count = letohs(count); img->foff += sizeof count;
+ if (fread(&xval, sizeof xval, 1, img->f) != 1) goto readerr;
+ xval = letohs(xval); img->foff += sizeof xval;
+ if (xval == 1000)
+ return 1;
+
+ /* Ensure that the row fits in the image. */
+ if (img->height - img->currenty <= yval || xval >= img->width) {
+ lbx_errno = LBX_EFORMAT;
+ return -1;
+ }
+
+ img->currenty += yval;
+ img->currentx = xval;
+ } else {
+ if (fread(&xval, sizeof xval, 1, img->f) != 1) goto readerr;
+ xval = letohs(xval); img->foff += sizeof xval;
+
+ if (img->width - img->currentx <= xval) {
+ lbx_errno = LBX_EFORMAT;
+ return -1;
+ }
+ img->currentx += xval;
+
+ count = type;
+
+ }
+
+ if (count > img->width - img->currentx) {
+ lbx_errno = LBX_EFORMAT;
+ 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;
+ img->foff += rc;
+
+ if (rc < count)
+ goto readerr;
+
+ if (count % 2) {
+ if (fread(&abyss, 1, 1, img->f) != 1)
+ goto readerr;
+ img->foff += 1;
+ }
+
+ return 0;
+readerr:
+ if (feof(img->f)) {
+ lbx_errno = LBX_EEOF;
+ } else {
+ lbx_errno = -errno;
+ }
+ 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) {
+ lbx_errno = LBX_ERANGE;
+ return NULL;
+ }
+
+ if (!img->framedata) {
+ img->framedata = allocframebuffer(img->width, img->height);
+ if (!img->framedata)
+ return NULL;
+ }
+
+ if (!img->mask) {
+ img->mask = allocframebuffer(img->width, img->height);
+ if (!img->mask)
+ return NULL;
+ }
+
+ /* Start over if we are backtracking. */
+ if (img->currentframe > frame)
+ img->currentframe == -1;
+
+ 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) {
+ if (!lbximg_getframe(img, frame-1))
+ return NULL;
+ }
+ }
+
+ if (img->currentframe != frame) {
+ int rc, first = 1;
+
+ if (_lbx_fseek(img->f, &img->foff, img->offsets[frame]) == -1)
+ return NULL;
+
+ do {
+ rc = _lbx_drawrow(first, img);
+ if (rc == -1)
+ return NULL;
+ first = 0;
+
+ if (!rc && img->foff > img->offsets[frame+1]) {
+ lbx_errno = LBX_EFORMAT;
+ return NULL;
+ }
+ } while (!rc);
+ }
+
+ img->currentframe = frame;
+ return img->framedata;
+}
+
+int lbximg_loadpalette(FILE *f, struct lbx_colour palette[static 256])
+{
+ uint8_t entry[4];
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ if (fread(entry, sizeof entry, 1, f) != 1) {
+ lbx_errno = (feof(f)) ? LBX_EEOF : -errno;
+ return -1;
+ }
+
+ if (entry[0] != 1) {
+ lbx_errno = LBX_EFORMAT;
+ return -1;
+ }
+
+ palette[i] = (struct lbx_colour){
+ .red = entry[1] << 2,
+ .green = entry[2] << 2,
+ .blue = entry[3] << 2,
+ };
+ }
+
+ return 0;
+}
+
+int
+lbximg_getpalette(struct lbx_image *img, struct lbx_colour palette[static 256])
+{
+ unsigned int i;
+ size_t rc;
+
+ uint8_t entry[4];
+
+ /* Do nothing if the image doesn't have embedded palette data. */
+ if (!(img->flags & FLAG_PALETTE))
+ return 0;
+
+ if (_lbx_fseek(img->f, &img->foff, img->paloff) == -1)
+ return -1;
+
+ for (i = 0; i < img->palcount; i++) {
+ rc = fread(entry, 1, sizeof entry, img->f);
+ img->foff += rc;
+
+ if (rc < sizeof entry) {
+ goto readerr;
+ }
+
+ if (entry[0] != 0) {
+ lbx_errno = LBX_EFORMAT;
+ return -1;
+ }
+
+ palette[img->palstart + i] = (struct lbx_colour){
+ .red = entry[1] << 2,
+ .green = entry[2] << 2,
+ .blue = entry[3] << 2,
+ };
+ }
+
+ return 0;
+readerr:
+ lbx_errno = feof(img->f) ? LBX_EEOF : -errno;
+ return -1;
+}
+
+void lbximg_getinfo(struct lbx_image *img, struct lbx_imginfo *info)
+{
+ *info = (struct lbx_imginfo) {
+ .width = img->width,
+ .height = img->height,
+ .nframes = img->frames,
+ .palettesz = (img->flags & FLAG_PALETTE) ? img->palcount : 0,
+ };
+
+ /* There seems to be two ways of specifying that an image loops. */
+ if (img->flags & FLAG_LOOPING) {
+ info->loopstart = 0;
+ info->looping = 1;
+ } else if (img->leadin != img->frames - 1) {
+ info->loopstart = img->leadin;
+ info->looping = 1;
+ }
+}
+
+unsigned char **lbximg_getmask(struct lbx_image *img)
+{
+ return img->mask;
+}
+
void lbximg_close(struct lbx_image *img)
{
if (!img) return;
+ if (img->framedata) {
+ free(img->framedata[0]);
+ free(img->framedata);
+ }
+
+ if (img->mask) {
+ free(img->mask[0]);
+ free(img->mask);
+ }
+
if (img->f) {
fclose(img->f);
}