hb_blob_t *blob = reference_blob_for_glyph (glyph, x_ppem, y_ppem,
HB_TAG ('p','n','g',' '),
&x_offset, &y_offset);
- if (hb_blob_get_length (blob) < sizeof (PNGHeader))
+
+ const PNGHeader &header = *blob->as<PNGHeader>();
+ if (header.width == 0 && header.width == 0)
return false;
extents->x_bearing = x_offset;
extents->y_bearing = y_offset;
- const PNGHeader &header = *blob->as<PNGHeader>();
extents->width = header.width;
extents->height = header.height;
hb_blob_destroy (blob);