gdiplus: Don't create a DIB section for non-alpha or reference bitmaps.

Vincent Povirk vincent at
Thu Sep 30 16:20:40 CDT 2010

I sent a patch earlier that adds an option for this.

This can theoretically cause a regression if a program creates a bitmap from a custom buffer and draws to it with a not-yet-implemented-in-software gdiplus function. However, I expect that in most cases if a program supplies a custom buffer, it expects drawing operations to change that buffer, and the program will need this change before it can work correctly anyway.

So I'm expecting to see far more programs that require this change (even if they're not immediately improved, this should make the issues easier to identify) than programs that are broken by it.
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