diff options
-rw-r--r-- | lib/libpamn.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/libpamn.c b/lib/libpamn.c index ff8af2fb..bd3fab21 100644 --- a/lib/libpamn.c +++ b/lib/libpamn.c @@ -541,7 +541,12 @@ static void applyopacityCommon(enum applyUnapply const applyUnapply, struct pam * const pamP, tuplen * const tuplenrow) { - +/*---------------------------------------------------------------------------- + Either apply or unapply opacity to the row tuplenrow[], per + 'applyUnapply'. Apply means to multiply each foreground sample by + the opacity value for that pixel; Unapply means to do the inverse, as + if the foreground values had already been so multiplied. +-----------------------------------------------------------------------------*/ unsigned int opacityPlane; bool haveOpacity; |