From: Nick Bowler <nbowler@draconx.ca>
Date: Mon, 8 Feb 2010 04:58:57 +0000 (-0500)
Subject: liblbx: Clear the image mask when backtracking frames.
X-Git-Url: https://git.draconx.ca/gitweb/liblbx.git/commitdiff_plain/5cd07246cf1e87f099c88e89c6aa0a4cfb3b202b

liblbx: Clear the image mask when backtracking frames.

Without this, undrawn pixels in the first frame will have the pixel
values from the previously drawn frame.
---

diff --git a/src/image.c b/src/image.c
index 9ad154a..76fbfed 100644
--- a/src/image.c
+++ b/src/image.c
@@ -291,8 +291,10 @@ unsigned char **lbximg_getframe(struct lbx_image *img, int frame)
 		memset(img->mask[0],      0, img->width * img->height);
 	} else {
 		/* Start over if we are backtracking. */
-		if (img->currentframe > frame)
+		if (img->currentframe > frame) {
+			memset(img->mask[0], 0, img->width * img->height);
 			img->currentframe = -1;
+		}
 
 		/* We must have previous frame decoded to continue. */
 		if (frame > img->currentframe + 1) {