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wintab32: Use 64-bit math in ScaleForContext.

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With some tablet configurations, the InExt value passed to
ScaleForContext can be very large, leading to an integer overflow.

Signed-off-by: John Chadwick <john@jchw.io>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
John Chadwick 2019-11-17 14:26:40 -08:00 committed by Alexandre Julliard
parent a45dfea99a
commit 27afc0d3ab
1 changed files with 2 additions and 2 deletions
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4
dlls/wintab32/context.c
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@ -178,9 +178,9 @@ int TABLET_PostTabletMessage(LPOPENCONTEXT newcontext, UINT msg, WPARAM wParam,
static inline DWORD ScaleForContext(DWORD In, LONG InOrg, LONG InExt, LONG OutOrg, LONG OutExt)
{
if (((InExt > 0 )&&(OutExt > 0)) || ((InExt<0) && (OutExt < 0)))
return ((In - InOrg) * abs(OutExt) / abs(InExt)) + OutOrg;
return MulDiv(In - InOrg, abs(OutExt), abs(InExt)) + OutOrg;
else
return ((abs(InExt) - (In - InOrg))*abs(OutExt) / abs(InExt)) + OutOrg;
return MulDiv(abs(InExt) - (In - InOrg), abs(OutExt), abs(InExt)) + OutOrg;
}
LPOPENCONTEXT AddPacketToContextQueue(LPWTPACKET packet, HWND hwnd)