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[base] Some comments.

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This commit is contained in:
Werner Lemberg 2018-09-21 08:32:22 +02:00
parent 2a9850c4fc
commit 493aa68f5c
1 changed files with 9 additions and 2 deletions
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11
src/base/ftobjs.c
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@ -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 )