Fix #813: Animated GIF should use faster antialiasing (or none at all)

https://github.com/BestImageViewer/geeqie/issues/813

If the file extension is .gif, 2pass is set to FALSE, and interpolation
is set to nearest.

diff --git a/src/image.c b/src/image.c
index c81b1c5..889f241 100644 (file)
--- a/src/image.c
+++ b/src/image.c
@@ -1095,6 +1095,15 @@ static void image_change_complete(ImageWindow *imd, gdouble zoom)
                        pr = PIXBUF_RENDERER(imd->pr);
                        pr->zoom = zoom;        /* store the zoom, needed by the loader */
 
+                       /* Disable 2-pass for GIFs. Animated GIFs can flicker when enabled
+                        * Reduce quality to worst but fastest to avoid dropped frames */
+                       if (g_ascii_strcasecmp(imd->image_fd->extension, ".GIF") == 0)
+                               {
+                               g_object_set(G_OBJECT(imd->pr), "zoom_2pass", FALSE, NULL);
+                               g_object_set(G_OBJECT(imd->pr), "zoom_quality", GDK_INTERP_NEAREST, NULL);
+                               }
+
+
                        if (image_load_begin(imd, imd->image_fd))
                                {
                                imd->unknown = FALSE;