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-rw-r--r--frontends/gtk/bitmap.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/frontends/gtk/bitmap.c b/frontends/gtk/bitmap.c
index 36b614cf9..e7b859d06 100644
--- a/frontends/gtk/bitmap.c
+++ b/frontends/gtk/bitmap.c
@@ -478,6 +478,10 @@ bitmap_render(struct bitmap *bitmap, struct hlcache_handle *content)
* aspect ratio of the required thumbnail. */
cheight = ((cwidth * dheight) + (dwidth / 2)) / dwidth;
+ /* At this point, we MUST have decided to render something non-zero sized */
+ assert(cwidth > 0);
+ assert(cheight > 0);
+
/* Create surface to render into */
surface = cairo_surface_create_similar(dsurface, CAIRO_CONTENT_COLOR_ALPHA, cwidth, cheight);