[Wine] DIBEngine: GetDIBits and BitBlt

Roald Ribe roald.ribe at hotmail.com
Sun Nov 20 00:29:57 CST 2011

On Sun, 20 Nov 2011 01:47:02 -0300, Dribble <wineforum-user at winehq.org> wrote:

> I am trying to run a Windows app on Mac using Wineskin. The app uses the functions GetDIBits and BitBlt for the purpose of capturing a snapshot of the screen.
> The problem is that these functions seem to behave a little different with Wineskin than in Windows. For example:
> HBITMAP hbm;
> hbm = (HBITMAP) GetCurrentObject(bitmapDC, OBJ_BITMAP);
> GetDIBits(bitmapDC, hbm, 0, 0, NULL, (LPBITMAPINFO) bitmapInfo, DIB_RGB_COLORS);
> After I do the above, I get wrong info in bitmapInfo (bitcount 1 instead of 32, width 1 instead of 1366, height 1 instead of 768, compression BI_RGB instead of the BI_BITFIELDS that I get in Windows).
> Also, when I use BitBlt to copy from screen DC to a bitmap DC, I get a black bitmap when running on Wine.
> I'm new to Wine (the reason I'm using Wineskin) and after some Googling I came across the notes on DIBEngine.  Compiling wine is no small task on a Mac, so before I start down that road, can anyone tell me:  will DIBEngine fix this issue?

Ending up with a 1x1 b/w bitmap is a quite normal occurrence even in "real" Windows, if the DC's/bitmaps are not obtained/created/selected/initialized in the right way/sequence. Whether that is the case here is impossible to tell from your example. If you can document a difference in behavior (with a code sample), you should report it as a bug.


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