[mapserver-users] Problems with png output when using libpng 1.5

[Christy Nieman]

Thomas,

Sorry it took me awhile to respond - I'd left things compiling when I 
went home last night, and it failed, so I had to fix it and get it going 
again this morning.  With libpng 1.5.3 beta3 and mapserver 6.0 beta 7 
(since it was released before I fixed things this morning), everything 
now seems fine.

Christy

On 04/21/2011 04:59 AM, thomas bonfort wrote:
> Christy,
> Can you confirm that the bug disappeared with the latest libpng beta ?
>
> --
> thomas
>
> On Wed, Apr 20, 2011 at 16:39, Christy Nieman<cnieman at dmsolutions.ca>  wrote:
>> Aha, thanks Thomas.  I hadn't found that.
>>
>> On 04/20/2011 10:28 AM, thomas bonfort wrote:
>>> Christy,
>>> I suspect this is due to a bug in libpng. see
>>>
>>> http://sourceforge.net/tracker/index.php?func=detail&aid=3288207&group_id=5624&atid=105624
>>> .
>>>
>>> On Wed, Apr 20, 2011 at 15:20, Christy Nieman<cnieman at dmsolutions.ca>
>>>   wrote:
>>>> Hi,
>>>>
>>>> I compiled MapServer 6.0 beta6 against libpng 1.5.2 and encountered the
>>>> following problems:
>>>>
>>>> when using the default png IMAGETYPE (i.e. no OUTPUTFORMAT block), I got
>>>> yellow&    striped maps (see cyprus.png)
>>>> when using the AGG/PNG driver and IMAGEMODE "RGBA", the output image
>>>> looks
>>>> fine
>>>> when using the default png8 IMAGETYPE, the output image looks fine
>>>>
>>>> I also compiled with cairo, and with the driver set to CAIRO/PNG, I had
>>>> the
>>>> same yellow&    striped maps.
>>> rgba and png8 use different png formats. agg/png and cairo/png use the
>>> same codepath when saving images, so the behavior your are observing
>>> is normal.
>>>
>>>> With libpng 1.2.44, everything seems to work properly.  Has anyone else
>>>> seen
>>>> this problem with libpng 1.5?  Should it work properly with MapServer?
>>>>
>>>> Regards,
>>>> Christy
>>>>
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>>>>
>>>>