reduce calls to win-title

rather than calling the script unconditionally per redraw, we now have
a `title_dirty` flag and keep track of when any of the relavent
information changes.

Co-authored-by: Arthur Williams <taaparthur@gmail.com>
Partially fixes: https://github.com/nsxiv/nsxiv/issues/258

1 files changed, 2 insertions, 3 deletions

diff --git a/image.c b/image.c
index 2904887..02e3957 100644
--- a/image.c
+++ b/image.c
@@ -546,7 +546,7 @@ static bool img_fit(img_t *img)
 
 	if (ABS(img->zoom - z) > 1.0/MAX(img->w, img->h)) {
 		img->zoom = z;
-		img->dirty = true;
+		img->dirty = title_dirty = true;
 		return true;
 	} else {
 		return false;
@@ -677,8 +677,7 @@ bool img_zoom_to(img_t *img, float z)
 		img->y = y - (y - img->y) * z / img->zoom;
 		img->zoom = z;
 		img->scalemode = SCALE_ZOOM;
-		img->checkpan = true;
-		img->dirty = true;
+		img->dirty = img->checkpan = title_dirty = true;
 		return true;
 	} else {
 		return false;