xv and png

[Ryan Schmidt]

On Apr 4, 2008, at 19:39, Rainer Müller wrote:

> Joerg van den Hoff wrote:
>
>> standard  `xv'   does  not have png support although patches
>> seem to exist.
>
> The standard xv release does not support PNG images according to  
> the homepage. Even if there are any patches available somewhere,  
> they are not applied at the moment.
>
> There is an official patch on the downloads page, "Patch to read/ 
> write PNG files" [1].
>
> The statement in the description is, "This version has been patched  
> to support the PNG & PhotoCD image types." But it seems that it is  
> just using the standard source distribution without additional  
> patches.
>
>> `port  info  xv'  lists `libpng'  as one of the dependencies
>> and PNG is explicitely mentioned under  the  supported  file
>> formats.   therefore  I installed it hoping for PNG support,
>> but without success: no display of png images.
>
> Strange enough, it is really linked against libpng. But it can't  
> display PNG images for me neither.
>
> $ otool -L /opt/local/bin/xv
> /opt/local/bin/xv:
> [...]
>         /opt/local/lib/libjpeg.62.dylib (compatibility version  
> 63.0.0, current version 63.0.0)
>         /opt/local/lib/libtiff.3.dylib (compatibility version  
> 12.0.0, current version 12.2.0)
>         /usr/X11/lib/libpng.3.dylib (compatibility version 4.0.0,  
> current version 4.0.0)
> [...]

Looks like it's also linked against the system's libpng, not  
MacPorts' libpng, which is unfortunate and should be fixed.