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List:       cairo
Subject:    Re: [cairo] Alpha problems at some resolutions
From:       Behdad Esfahbod <behdad () behdad ! org>
Date:       2008-06-21 17:03:20
Message-ID: 1214067800.1272.76.camel () behdad ! behdad ! org
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On Sat, 2008-06-21 at 16:25 +0300, M Joonas Pihlaja wrote:
> Hi John,
> 
> On Fri, 20 Jun 2008, John Perkins wrote:
> 
> > I found that clearing the image prior to drawing seems to fix the problem.
> > 
> > What I don't understand is how I have never seen random garbage, it is always \
> > this transparent yellow.
> 
> Looking at the attached image in gimp shows the ARGB value of the
> transparent yellow to be $BAADF00D.  That looks like something
> malloc() might initialise memory to in debug builds.

Indeed.  From http://en.wikipedia.org/wiki/0xDEADBEEF#Magic_debug_values

0xBAADF00D : Used by Microsoft's LocalAlloc(LMEM_FIXED) to mark
uninitialised allocated heap memory

> Cheers,
> 
> Joonas

-- 
behdad
http://behdad.org/

"Those who would give up Essential Liberty to purchase a little
 Temporary Safety, deserve neither Liberty nor Safety."
        -- Benjamin Franklin, 1759

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