windowscodecs: Implement CreateBitmapFromHBITMAP.

[Dmitry Timoshkov]

Vincent Povirk <madewokherd at gmail.com> wrote:

> Maybe the format for 32-bit bitmaps should be determined by the alpha
> channel options?

Probably, but as the patch comment says the code is based on gdiplus
implementation, and there is no such an option flag in the corresponding
gdiplus API params. I'd suggest to accept the patch as as, and make further
improvements based on it.

-- 
Dmitry.