commit ea3987db9ae910923a93c4001af8ca7c2589338c
Author: Carl Worth <cworth@cworth.org>
Date:   Wed Jun 14 04:32:25 2006 -0700

    Bug 6617: Special case size-zero bitmap glyphs to avoid setting an error

diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
index c5fb728..340d9c1 100644
--- a/src/cairo-ft-font.c
+++ b/src/cairo-ft-font.c
@@ -705,7 +705,7 @@ _native_byte_order_lsb (void)
     return *((char *) &x) == 1;
 }
 
-/* Fills in val->image with an image surface created from @bitmap
+/* Creates an image surface from @bitmap
  */
 static cairo_status_t
 _get_bitmap_surface (FT_Bitmap		     *bitmap,
@@ -721,6 +721,15 @@ _get_bitmap_surface (FT_Bitmap		     *bi
     width = bitmap->width;
     height = bitmap->rows;
 
+    /* For a size-zero bitmap we still want to have a valid pointer to
+     * an image surface, but presumably we don't care what format we
+     * use for that. */
+    if (width == 0 || height == 0) {
+	*surface = (cairo_image_surface_t *)
+	    cairo_image_surface_create (CAIRO_FORMAT_A1, 0, 0);
+	return (*surface)->base.status;
+    }
+
     switch (bitmap->pixel_mode) {
     case FT_PIXEL_MODE_MONO:
 	stride = (((width + 31) & ~31) >> 3);