Alexandre Julliard julliard@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.
I just added the code to my test app to draw a bitmap with BitBlt() loaded with LoadBitmap() (instead of assigning it to the Static control), and the result is drawn without transparency under Windows.