Hey,
I am experiencing some really weird behavior with CGDisplaySetDisplayMode
behavior on osx 10.9.3 on a late 2013 retina mbp.
if I call CGDisplaySetDisplayMode only once, it seems to end up in weird
display modes, that are not even listed through CGDisplayCopyAllDisplayModes
i.e. oftentimes 16 bit modes. If I call CGDisplaySetDisplayMode again right
afterwards, it goes to the desired mode. Here is a very simple example:
if I do:
GDisplayModeRef originalMode = CGDisplayCopyDisplayMode(CGMainDisplayID());
CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
CGDisplayModeRelease(originalMode);
It goes from the current mode (1440x900,32 bit hidpi) to the same mode in 16
bit!!
If I do:
GDisplayModeRef originalMode = CGDisplayCopyDisplayMode(CGMainDisplayID());
CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
CGDisplayModeRelease(originalMode);
it arrives at the correct mode.
This is the simplest test case I could come up with as I was getting similar
garbage when using CGDisplayCopyAllDisplayModes
to select a specific mode, i.e:
CFArrayRef allModes = CGDisplayCopyAllDisplayModes(_id, NULL);
if(allModes)
{
for(int i = 0; i < CFArrayGetCount(allModes); i++)
{
CGDisplayModeRef mode =
(CGDisplayModeRef)CFArrayGetValueAtIndex(allModes, i);
Size width = CGDisplayModeGetWidth(mode);
Size height = CGDisplayModeGetHeight(mode);
if(width == 800 && height == 600)
{
CGDisplaySetDisplayMode((CGDirectDisplayID)_id,
mode, NULL);
//CGDisplaySetDisplayMode((CGDirectDisplayID)_id,
mode, NULL);
break;
}
}
CFRelease(allModes);
}
Only properly goes to 800x600 if I uncomment the second call to
CGDisplaySetDisplayMode this seems really odd…
Any ideas?
thanks,
Matthias
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