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MMX2 scaler: factorize initMMX2Scaler(). 

Originally committed as revision 29453 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla 2009-07-28 05:42:46 +00:00
parent 901775c714
commit f1c6dfa371
1 changed files with 10 additions and 30 deletions
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40
libswscale/swscale.c
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@ -1889,6 +1889,10 @@ static void initMMX2HScaler(int dstW, int xInc, uint8_t *funnyCode, int16_t *fil
int c=((xpos+xInc*2)>>16) - xx;
int d=((xpos+xInc*3)>>16) - xx;
int inc = (d+1<4);
uint8_t *fragment = (d+1<4) ? fragmentB : fragmentA;
x86_reg imm8OfPShufW1 = (d+1<4) ? imm8OfPShufW1B : imm8OfPShufW1A;
x86_reg imm8OfPShufW2 = (d+1<4) ? imm8OfPShufW2B : imm8OfPShufW2A;
x86_reg fragmentLength = (d+1<4) ? fragmentLengthB : fragmentLengthA;
filter[i ] = (( xpos & 0xFFFF) ^ 0xFFFF)>>9;
filter[i+1] = (((xpos+xInc ) & 0xFFFF) ^ 0xFFFF)>>9;
@ -1896,16 +1900,15 @@ static void initMMX2HScaler(int dstW, int xInc, uint8_t *funnyCode, int16_t *fil
filter[i+3] = (((xpos+xInc*3) & 0xFFFF) ^ 0xFFFF)>>9;
filterPos[i/2]= xx;
if (d+1<4)
{
int maxShift= 3-(d+inc);
int shift=0;
memcpy(funnyCode + fragmentPos, fragmentB, fragmentLengthB);
memcpy(funnyCode + fragmentPos, fragment, fragmentLength);
funnyCode[fragmentPos + imm8OfPShufW1B]=
funnyCode[fragmentPos + imm8OfPShufW1]=
(a+inc) | ((b+inc)<<2) | ((c+inc)<<4) | ((d+inc)<<6);
funnyCode[fragmentPos + imm8OfPShufW2B]=
funnyCode[fragmentPos + imm8OfPShufW2]=
a | (b<<2) | (c<<4) | (d<<6);
if (i+4-inc>=dstW) shift=maxShift; //avoid overread
@ -1913,35 +1916,12 @@ static void initMMX2HScaler(int dstW, int xInc, uint8_t *funnyCode, int16_t *fil
if (shift && i>=shift)
{
funnyCode[fragmentPos + imm8OfPShufW1B]+= 0x55*shift;
funnyCode[fragmentPos + imm8OfPShufW2B]+= 0x55*shift;
funnyCode[fragmentPos + imm8OfPShufW1]+= 0x55*shift;
funnyCode[fragmentPos + imm8OfPShufW2]+= 0x55*shift;
filterPos[i/2]-=shift;
}
fragmentPos+= fragmentLengthB;
}
else
{
int maxShift= 3-d;
int shift=0;
memcpy(funnyCode + fragmentPos, fragmentA, fragmentLengthA);
funnyCode[fragmentPos + imm8OfPShufW1A]=
funnyCode[fragmentPos + imm8OfPShufW2A]=
a | (b<<2) | (c<<4) | (d<<6);
if (i+4>=dstW) shift=maxShift; //avoid overread
else if ((filterPos[i/2]&3) <= maxShift) shift=filterPos[i/2]&3; //partial align
if (shift && i>=shift)
{
funnyCode[fragmentPos + imm8OfPShufW1A]+= 0x55*shift;
funnyCode[fragmentPos + imm8OfPShufW2A]+= 0x55*shift;
filterPos[i/2]-=shift;
}
fragmentPos+= fragmentLengthA;
fragmentPos+= fragmentLength;
}
funnyCode[fragmentPos]= RET;