OSX wxClientDC coordinates slides by +2 pixels

[erdem_ua]

On OSX Cacao and wxWidgets version 2.9.4 (but AFAIK this is true for all previous 2.9 releases) wxClientDC coordinates are slides +2 pixel at both x and y vector.

Than 0,0 became +2,+2 at screen and leave first 2 pixels are not updated by last render and produce corruption/artifacts on screen...

Instead using wxWindowDC has no such an issue.

I believe this bug also effects wxCaret, so it miss aligned to text. Probably it's due use of wxClientDC at it's code.

[csomor]

the different between the windowdc and wxclient is the origin which for the first is at the border while for the second it is at the content. caret is using a completely different overlay dc. do you have a patch to minimal sample which shows a real drawing issues outside of wxCaret ?

[erdem_ua]

Sorry not the patch but custom minimal program to show issue.
Valuable lines are located at 28 - 47.

wxPaintDC & wxWindowDC makes their job as intended.
But on OSX wx2.9.x CACAO has +2 pixel on both axis if you are do same thing with wxClientDC.

And same issue is available caret sample clearly.
Regards.

[csomor]

thanks,

[SC]

(In [73199]) setting offsets for window and client dcs when not in a paint event, see #14904

[erdem_ua]

Looks fixed wxClientDC.
But this time I think the patch broke wxWindowDC.
wxWindowDC draw -2 pixel on both axis with the patch.
O:)

[csomor]

wxWindowDC must draw on the border, that is correct, so the topleft will not be visible in your sample, as it is covered by the window's frame

[csomor]

to be exact: by the wxWindow's border

[erdem_ua]

Thanks :)