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Correct rounding of the result in MulDiv16().

This commit is contained in:
Rein Klazes 2000-03-12 21:12:38 +00:00 committed by Alexandre Julliard
parent c302f3bd4a
commit ad5d10f223
1 changed files with 21 additions and 6 deletions
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27
objects/gdiobj.c
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@ -1110,13 +1110,28 @@ WORD WINAPI GdiFreeResources16( DWORD reserve )
/***********************************************************************
* MulDiv16 (GDI.128)
*/
INT16 WINAPI MulDiv16( INT16 foo, INT16 bar, INT16 baz )
INT16 WINAPI MulDiv16(
INT16 nMultiplicand,
INT16 nMultiplier,
INT16 nDivisor)
{
INT ret;
if (!baz) return -32768;
ret = (foo * bar) / baz;
if (!nDivisor) return -32768;
/* 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 = (((int)nMultiplicand * nMultiplier) + (nDivisor/2)) / nDivisor;
else
ret = (((int)nMultiplicand * nMultiplier) - (nDivisor/2)) / nDivisor;
if ((ret > 32767) || (ret < -32767)) return -32768;
return ret;
return (INT16) ret;
}
@ -1129,8 +1144,8 @@ INT16 WINAPI MulDiv16( INT16 foo, INT16 bar, INT16 baz )
INT WINAPI MulDiv(
INT nMultiplicand,
INT nMultiplier,
INT nDivisor
) {
INT nDivisor)
{
#if SIZEOF_LONG_LONG >= 8
long long ret;