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merged optimizations from 2.2

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9820 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2001-04-21 01:46:19 +00:00
parent 0fa7981012
commit 807a903e68
7 changed files with 428 additions and 176 deletions
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18
src/msw/utils.cpp
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@@ -990,10 +990,22 @@ void wxGetMousePosition( int* x, int* y )
// Return TRUE if we have a colour display
bool wxColourDisplay()
{
ScreenHDC dc;
int noCols = GetDeviceCaps(dc, NUMCOLORS);
// this function is called from wxDC ctor so it is called a *lot* of times
// hence we optimize it a bit but doign the check only once
//
// this should be MT safe as only the GUI thread (holding the GUI mutex)
// can call us
static int s_isColour = -1;
return (noCols == -1) || (noCols > 2);
if ( s_isColour == -1 )
{
ScreenHDC dc;
int noCols = ::GetDeviceCaps(dc, NUMCOLORS);
s_isColour = (noCols == -1) || (noCols > 2);
}
return s_isColour != 0;
}
// Returns depth of screen