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This is a better fix for #1384, which is rather about signed overflow. * include/freetype/ftimage.h (FT_Span): Use unsigned position. * src/smooth/ftgrays.c (gray_sweep_direct): Sync with FT_Span. * src/smooth/ftsmooth.c (ft_smooth_render): Remove redundant shift. * src/base/ftobjs.c (ft_glyphslot_preset_bitmap): Readjust limits.