From a8bcc7b42b275b18bbc2f65f48fa637e20847d36 Mon Sep 17 00:00:00 2001 From: Ramiro Polla Date: Mon, 7 Dec 2009 03:52:55 +0000 Subject: [PATCH] Document the differences between the two asm fragments in initMMX2HScaler(). Originally committed as revision 29978 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale --- libswscale/swscale.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libswscale/swscale.c b/libswscale/swscale.c index 222c0c0..079ed31 100644 --- a/libswscale/swscale.c +++ b/libswscale/swscale.c @@ -1697,6 +1697,12 @@ static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *fil int xpos, i; // create an optimized horizontal scaling routine + /* This scaler is made of runtime-generated MMX2 code using specially + * tuned pshufw instructions. For every four output pixels, if four + * input pixels are enough for the fast bilinear scaling, then a chunk + * of fragmentB is used. If five input pixels are needed, then a chunk + * of fragmentA is used. + */ //code fragment -- 2.7.4