See screenshots included. If the center slice is NULL then west or north slice is also NULL so the height_n or width_w is also NULL. We can count these values from raw (non- scaled) bitmaps. The values will be the same as before for common cases. And the bug will be fixed.
-- With best regards, _______________________________ Vladimir Testov, ROSA Laboratory. www.rosalab.ru
<<attachment: after-widget-box.png>>
diff -Naur grub-2.01/grub-core/gfxmenu/widget-box.c grub-box-draw/grub-core/gfxmenu/widget-box.c --- grub-2.01/grub-core/gfxmenu/widget-box.c 2013-02-25 16:54:27.000000000 +0400 +++ grub-box-draw/grub-core/gfxmenu/widget-box.c 2013-07-17 21:25:10.536077964 +0400 @@ -81,8 +81,8 @@ int height_n; int width_w; - height_n = get_height (self->scaled_pixmaps[BOX_PIXMAP_N]); - width_w = get_width (self->scaled_pixmaps[BOX_PIXMAP_W]); + height_n = get_height (self->raw_pixmaps[BOX_PIXMAP_N]); + width_w = get_width (self->raw_pixmaps[BOX_PIXMAP_W]); /* Draw sides. */ blit (self, BOX_PIXMAP_N, x + width_w, y);
<<attachment: before-widget-box.png>>
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