Re: [Caml-list] camlimages problems on mac

[Samuel Hornus <samuel.hornus@inria.fr>]

On Nov7, 2012, at 14:20 , Alan Schmitt wrote:

> Samuel Hornus <samuel.hornus@inria.fr> writes:
> 
>> Hello,
>> 
>> When installing camlimages 4.0.1 with MacPort (Mac OS X 10.7.5, Latest MacPorts),
>> the resulting camlimages has no support for JPEG, PNG, PPM, XPM, etc…
>> which makes it sort of useless.
> I just tried to configure it using godi, and this is what is supported
> on my system:
> 
> External libraries: lablgtk2 bmp ppm png jpeg tiff freetype(2) ps
> 
> Most of my image libraries are installed through homebrew (I see for
> instance "jpeg" or "libpng", I don't know where the ppm support comes
> from).
> 
> To get support for gifs, I installed giflib (still through homebrew).
> 
> After doing this, camlimages seems to compile fine.

The compilation goes without a hitch here as well (both using omake or macports), but the support for most of the image file formats are automatically disabled after examining the third-party' header files, so you get an OCaml exception at runtime. There is a piece of code (from camlimages) that dumps what is actually supported (see below). Does your camlimages actually has support for  jpeg or png ?
Thank you Alan for your answer,
Sam

 let capabilities () = let open Format in
  let supported b = if b then "supported" else "not supported" in
  printf "*******************************************************@.";
  printf "Camlimages library capabilities currently available@.";
  printf "bmp\t: %s@." (supported Camlimages.lib_bmp);
  printf "ppm\t: %s@." (supported Camlimages.lib_ppm);
  printf "gif\t: %s@." (supported Camlimages.lib_gif);
  printf "jpeg\t: %s@." (supported Camlimages.lib_jpeg);
  printf "tiff\t: %s@." (supported Camlimages.lib_tiff);
  printf "png\t: %s@." (supported Camlimages.lib_png);
  printf "xpm\t: %s@." (supported Camlimages.lib_xpm);
  printf "xv thumbnails\t: %s@." (supported Camlimages.lib_xvthumb);
  printf "postscript\t: %s@." (supported Camlimages.lib_ps);
  printf "freetype\t: %s@." (supported Camlimages.lib_freetype);
  printf "*******************************************************@.";;

Mine shows:
bmp	: supported
ppm	: supported (* but crashes anyway: Fatal error: exception Images.Wrong_file_type *)
gif	: not supported
jpeg	: not supported
tiff	: not supported
png	: not supported
xpm	: supported (* but crashes anyway: Fatal error: exception Images.Wrong_file_type *)
xv thumbnails	: supported
postscript	: supported
freetype	: supported