diff options
Diffstat (limited to 'prefsize_windows.go')
| -rw-r--r-- | prefsize_windows.go | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/prefsize_windows.go b/prefsize_windows.go index 68b54b9..4425f64 100644 --- a/prefsize_windows.go +++ b/prefsize_windows.go @@ -112,13 +112,18 @@ func (s *sysData) preferredSize() (width int, height int) { return width, height } -// attempts to mimic the behavior of kernel32.MulDiv() -// caling it directly would be better (TODO) -// alternatively TODO make sure the rounding is correct +var ( + _mulDiv = kernel32.NewProc("MulDiv") +) + func muldiv(ma int, mb int, div int) int { - xa := int64(ma) * int64(mb) - xa /= int64(div) - return int(xa) + // div will not be 0 in the usages above + // we also ignore overflow; that isn't likely to happen for our use case anytime soon + r1, _, _ := _mulDiv.Call( + uintptr(int32(ma)), + uintptr(int32(mb)), + uintptr(int32(div))) + return int(int32(r1)) } type _TEXTMETRICS struct { |