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Document the differences between the two asm fragments in initMMX2HScaler().

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Originally committed as revision 29978 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla
2009-12-07 03:52:55 +00:00
parent 445a9deea6
commit a8bcc7b42b
1 changed files with 6 additions and 0 deletions
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6
libswscale/swscale.c
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@ -1697,6 +1697,12 @@ static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *fil
int xpos, i; int xpos, i;
// create an optimized horizontal scaling routine // 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 //code fragment