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DPtoLP needs to round the result. 

Fixed MulDiv to deal better with negative numbers.
This commit is contained in:
Francis Beaudet 1999-09-27 11:44:01 +00:00 committed by Alexandre Julliard
parent d3d2477014
commit ec09a400a7
2 changed files with 39 additions and 10 deletions
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16
include/gdi.h
View File

@ -402,24 +402,24 @@ static inline void WINE_UNUSED INTERNAL_LPTODP(DC *dc, LPPOINT point)
} }
#define XDPTOLP(dc,x) \ #define XDPTOLP(dc,x) \
(((x)-(dc)->vportOrgX) * (dc)->wndExtX / (dc)->vportExtX+(dc)->wndOrgX) (MulDiv(((x)-(dc)->vportOrgX), (dc)->wndExtX, (dc)->vportExtX) + (dc)->wndOrgX)
#define YDPTOLP(dc,y) \ #define YDPTOLP(dc,y) \
(((y)-(dc)->vportOrgY) * (dc)->wndExtY / (dc)->vportExtY+(dc)->wndOrgY) (MulDiv(((y)-(dc)->vportOrgY), (dc)->wndExtY, (dc)->vportExtY) + (dc)->wndOrgY)
#define XLPTODP(dc,x) \ #define XLPTODP(dc,x) \
(((x)-(dc)->wndOrgX) * (dc)->vportExtX / (dc)->wndExtX+(dc)->vportOrgX) (MulDiv(((x)-(dc)->wndOrgX), (dc)->vportExtX, (dc)->wndExtX) + (dc)->vportOrgX)
#define YLPTODP(dc,y) \ #define YLPTODP(dc,y) \
(((y)-(dc)->wndOrgY) * (dc)->vportExtY / (dc)->wndExtY+(dc)->vportOrgY) (MulDiv(((y)-(dc)->wndOrgY), (dc)->vportExtY, (dc)->wndExtY) + (dc)->vportOrgY)
/* Device <-> logical size conversion */ /* Device <-> logical size conversion */
#define XDSTOLS(dc,x) \ #define XDSTOLS(dc,x) \
((x) * (dc)->wndExtX / (dc)->vportExtX) MulDiv((x), (dc)->wndExtX, (dc)->vportExtX)
#define YDSTOLS(dc,y) \ #define YDSTOLS(dc,y) \
((y) * (dc)->wndExtY / (dc)->vportExtY) MulDiv((y), (dc)->wndExtY, (dc)->vportExtY)
#define XLSTODS(dc,x) \ #define XLSTODS(dc,x) \
((x) * (dc)->vportExtX / (dc)->wndExtX) MulDiv((x), (dc)->vportExtX, (dc)->wndExtX)
#define YLSTODS(dc,y) \ #define YLSTODS(dc,y) \
((y) * (dc)->vportExtY / (dc)->wndExtY) MulDiv((y), (dc)->vportExtY, (dc)->wndExtY)
/* GDI local heap */ /* GDI local heap */

33
objects/gdiobj.c
View File

@ -1029,13 +1029,42 @@ INT WINAPI MulDiv(
) { ) {
#if (SIZEOF_LONG_LONG >= 8) #if (SIZEOF_LONG_LONG >= 8)
long long ret; long long ret;
if (!nDivisor) return -1; if (!nDivisor) return -1;
ret = (((long long)nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
/* We want to deal with a positive divisor to simplify the logic. */
if (nDivisor < 0)
{
nMultiplicand = - nMultiplicand;
nDivisor = -nDivisor;
}
/* If the result is positive, we "add" to round. else, we subtract to round. */
if ( ( (nMultiplicand < 0) && (nMultiplier < 0) ) ||
( (nMultiplicand >= 0) && (nMultiplier >= 0) ) )
ret = (((long long)nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
else
ret = (((long long)nMultiplicand * nMultiplier) - (nDivisor/2)) / nDivisor;
if ((ret > 2147483647) || (ret < -2147483647)) return -1; if ((ret > 2147483647) || (ret < -2147483647)) return -1;
return ret; return ret;
#else #else
if (!nDivisor) return -1; if (!nDivisor) return -1;
return ((nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
/* We want to deal with a positive divisor to simplify the logic. */
if (nDivisor < 0)
{
nMultiplicand = - nMultiplicand;
nDivisor = -nDivisor;
}
/* If the result is positive, we "add" to round. else, we subtract to round. */
if ( ( (nMultiplicand < 0) && (nMultiplier < 0) ) ||
( (nMultiplicand >= 0) && (nMultiplier >= 0) ) )
return ((nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
return ((nMultiplicand * nMultiplier) - (nDivisor/2)) / nDivisor;
#endif #endif
} }
/******************************************************************* /*******************************************************************