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eliminate unnecessary multiplications in the inner loops of DIB_1BPP_BitBltSrcCopy_From1BPP

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svn path=/trunk/; revision=9507
This commit is contained in:
Royce Mitchell III 2004-05-27 12:35:23 +00:00
parent 6e3bbc606d
commit 961036b735
1 changed files with 14 additions and 9 deletions
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23
reactos/subsys/win32k/dib/dib1bpp.c
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@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software * along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/ */
/* $Id: dib1bpp.c,v 1.28 2004/05/14 22:56:17 gvg Exp $ */ /* $Id: dib1bpp.c,v 1.29 2004/05/27 12:35:23 royce Exp $ */
#include <w32k.h> #include <w32k.h>
VOID VOID
@ -77,6 +77,7 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
// which direction are we going? // which direction are we going?
int xinc; int xinc;
int yinc; int yinc;
int ySrcDelta, yDstDelta;
// following 4 variables are used for the y-sweep // following 4 variables are used for the y-sweep
int dy; // dest y int dy; // dest y
@ -101,6 +102,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
dy2 = DestRect->bottom - 1; dy2 = DestRect->bottom - 1;
sy1 = SourcePoint->y; sy1 = SourcePoint->y;
yinc = 1; yinc = 1;
ySrcDelta = SourceSurf->lDelta;
yDstDelta = DestSurf->lDelta;
} }
else else
{ {
@ -109,6 +112,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
dy2 = DestRect->top; dy2 = DestRect->top;
sy1 = SourcePoint->y + dy1 - dy2; sy1 = SourcePoint->y + dy1 - dy2;
yinc = -1; yinc = -1;
ySrcDelta = -SourceSurf->lDelta;
yDstDelta = -DestSurf->lDelta;
} }
if ( DestRect->left <= SourcePoint->x ) if ( DestRect->left <= SourcePoint->x )
{ {
@ -161,8 +166,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
if ( dy == dy2 ) if ( dy == dy2 )
break; break;
dy += yinc; dy += yinc;
pd += yinc * DestSurf->lDelta; pd += yDstDelta;
ps += yinc * SourceSurf->lDelta; ps += ySrcDelta;
} }
} }
else if ( !(0xFF00 & (srcmask<<shift) ) ) // check if ps[0] not needed... else if ( !(0xFF00 & (srcmask<<shift) ) ) // check if ps[0] not needed...
@ -176,8 +181,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
if ( dy == dy2 ) if ( dy == dy2 )
break; break;
dy += yinc; dy += yinc;
pd += yinc * DestSurf->lDelta; pd += yDstDelta;
ps += yinc * SourceSurf->lDelta; ps += ySrcDelta;
} }
} }
else if ( !(0xFF & (srcmask<<shift) ) ) // check if ps[1] not needed... else if ( !(0xFF & (srcmask<<shift) ) ) // check if ps[1] not needed...
@ -191,8 +196,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
if ( dy == dy2 ) if ( dy == dy2 )
break; break;
dy += yinc; dy += yinc;
pd += yinc * DestSurf->lDelta; pd += yDstDelta;
ps += yinc * SourceSurf->lDelta; ps += ySrcDelta;
} }
} }
else // both ps[0] and ps[1] are needed else // both ps[0] and ps[1] are needed
@ -206,8 +211,8 @@ DIB_1BPP_BitBltSrcCopy_From1BPP (
if ( dy == dy2 ) if ( dy == dy2 )
break; break;
dy += yinc; dy += yinc;
pd += yinc * DestSurf->lDelta; pd += yDstDelta;
ps += yinc * SourceSurf->lDelta; ps += ySrcDelta;
} }
} }