[base] Some comments.
diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c
index 6509a4a..608c478 100644
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -391,8 +391,10 @@
case FT_RENDER_MODE_MONO:
pixel_mode = FT_PIXEL_MODE_MONO;
#if 1
- /* undocumented but confirmed: bbox values get rounded */
- /* for narrow glyphs bbox is extended to one pixel first */
+ /* x */
+
+ /* undocumented but confirmed: bbox values get rounded; */
+ /* for narrow glyphs bbox is extended to one pixel first */
if ( pbox.xMax - pbox.xMin <= 1 )
{
if ( pbox.xMax - pbox.xMin == 0 )
@@ -404,9 +406,14 @@
cbox.xMin = cbox.xMax = ( cbox.xMin + cbox.xMax ) / 2;
}
+ /* we do asymmetric rounding so that the center */
+ /* of a pixel gets always included */
+
pbox.xMin += ( cbox.xMin + 31 ) >> 6;
pbox.xMax += ( cbox.xMax + 32 ) >> 6;
+ /* y */
+
if ( pbox.yMax - pbox.yMin <= 1 )
{
if ( pbox.yMax - pbox.yMin == 0 )
