[2/3] gdiplus: If a 32-bit dib is selected in an hdc, use the dib directly.

Vincent Povirk madewokherd at gmail.com
Tue Dec 4 09:54:13 CST 2012

>>> you won't get a negative height with GetObject,
>> Hmm, is GdipCreateBitmapFromHBITMAP doing it right, then? It assumes
>> all DIB objects have positive stride.
> No, that's wrong. It should most likely just do a GetDIBits (in one go,
> not line by line like it currently does).

Does that mean there's no way to access the bits directly given a DIB object?

I think we do it line by line so that we don't rely on
GdipCreateBitmapFromScan0 to create the bitmap with a particular
stride. I guess we could specify a stride when calling that.

>>> you won't get DIB info at all for DDBs.
>> I don't think it makes sense to do this for DDBs, as I can't draw them
>> directly and don't expect them to have alpha information.
> Sure, but it shouldn't crash and burn.

I don't understand why it would. I'd expect the GetObject to fail
given sizeof(DIBSECTION) if the object is a DDB.

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