[Mono-winforms-list] [PATCH] DrawImage alpha blend broken in libgdiplus

Sebastien Pouliot sebastien.pouliot at gmail.com
Tue May 12 10:44:22 EDT 2009

On Tue, 2009-05-12 at 15:25 +0300, Alex Shulgin wrote:
> Alex Shulgin wrote:
> > Alex Shulgin wrote:
> >> Sebastien Pouliot wrote:
> >>> Sounds correct but will requires a lot of testing. Please open a bug
> >>> report for this  and copy/paste the email info into it (otherwise we'll
> >>> lose track of important data).
> >>
> >> Thanks, filed a bug here: 
> >> https://bugzilla.novell.com/show_bug.cgi?id=495516
> >>
> >> Will prepare a patch soon.
> > 
> > Hi all again!
> > 
> > I'm not posting this to the bug report, because there might be quite a 
> > discussion about this patch.
> I'd really, _really_ appreciate some feedback on this issue...

Thanks for your patch but *please*, like I said in my earlier email,
attach all patches to the bug reports. I don't mind them being sent to
any list, but not having them on the bug report means I won't see (or
remember them) next time I have time to look at libgdiplus bugs. And
like you've seen this is not the kind of patch to create "quite a

Two things about it:

1) caution: Historically such changes requires a lot of testing outside
libgdiplus. Many times it caused regressions that were found after one
(or more) release(s).

2) regression: even if unit tests are not enough it still better than
nothing. However when, like this patch, it breaks some* of them then
it's likely to break existing apps too (which often supplied, even if
indirectly, those test cases).


* it may looks strange but the number of bug reports abouts icons, and
their specific behavior, is much greater than the one about transparency

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