-static unsigned char **read_raw_frame(struct lbx_image_priv *img, int frame)
-{
- unsigned long size = img->pub.width * img->pub.height;
- int rc;
-
- assert(img->flags & FLAG_RAW);
-
- rc = lbx_img_seek(&img->pub, frame);
- if (rc < 0)
- return NULL;
-
- if (img->fops->read(img->framedata[0], size, img->f) != size) {
- if (img->fops->eof(img->f))
- lbx_error_raise(LBX_EEOF);
- return NULL;
- }
- memset(img->mask[0], 1, size);
-
- if (img->fops->tell(img->f) > img->offsets[frame+1]) {
- lbx_error_raise(LBX_EFORMAT);
- return NULL;
- }
-
- return img->framedata;
-}
-
-unsigned char **lbx_img_getframe(struct lbx_image *pub, int frame)
-{
- struct lbx_image_priv *img = (struct lbx_image_priv *)pub;
- unsigned char buf[4];
-
- if (frame >= pub->frames || frame < 0) {
- lbx_error_raise(LBX_EINVAL);
- return NULL;
- }
-
- if (!img->framedata) {
- img->framedata = allocframebuffer(pub->width, pub->height);
- if (!img->framedata)
- return NULL;
- }
-
- if (!img->mask) {
- img->mask = allocframebuffer(pub->width, pub->height);
- if (!img->mask)
- return NULL;
- }
-
- if (img->flags & FLAG_RAW)
- return read_raw_frame(img, frame);
-
- if ((img->flags & FLAG_OVERWRITE)
- || (pub->chunk && !(frame % pub->chunk))) {
- /* Clear the slate. */
- img->currentframe = -1;
- memset(img->framedata[0], 0, pub->width * pub->height);
- memset(img->mask[0], 0, pub->width * pub->height);
- } else {
- /* Start over if we are backtracking. */
- if (img->currentframe > frame) {
- memset(img->mask[0], 0, pub->width * pub->height);
- img->currentframe = -1;
- }
-
- /* We must have previous frame decoded to continue. */
- if (frame > img->currentframe + 1) {
- if (!lbx_img_getframe(pub, frame-1))
- return NULL;
- }
- }
-
- if (img->currentframe != frame) {
- int rc;
-
- rc = lbx_img_seek(pub, frame);
- if (rc < 0)
- return NULL;
-
- do {
- rc = _lbx_drawrow(img);
- if (rc == -1)
- return NULL;
-
- if (img->fops->tell(img->f) > img->offsets[frame+1]) {
- lbx_error_raise(LBX_EFORMAT);
- return NULL;
- }
- } while (!rc);
- }
-
- img->currentframe = frame;
- return img->framedata;
-}
-