[PATCH 2/2] comctl32: Paint 32-bpp bitmaps with an alpha channel using GdiAlphaBlend.

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at baikal.ru> writes:

> Alexandre Julliard <julliard at winehq.org> wrote:
>
>> My question was whether it's drawn with transparency in that case, since
>> it's not really specified in which cases a DDB is considered to have an
>> alpha channel.
>
> In order to draw it with a transparency it's necessary to create a 32-bpp
> DIB section, copy source bitmap bits, and use GdiAlphaBlend() with a DIB
> section. Basically my patch does all of this.

Yes of course. My question was whether on Windows it's drawn transparent
even for the DDB case. I guess the answer is yes since you have an app
that does this, but a small test case wouldn't hurt.

-- 
Alexandre Julliard
julliard at winehq.org