mingw32-gtk2, gtk-demo fails on loading images.

[Mikkel Kruse Johnsen]

Hi All

Have had some problems running the gtk-demo on windows (and through
wine) it fails when loading images.

I talked to "tml" on the #gtk+ IRC and he suggested that mingw32-gtk+
was compiled without GDI+, so I recompiled it with "--disable-gdiplus
--without-libtiff" and everyting works fine now. Images is loading.

Trying to get TIFF support, found mingw32-libtiff
(http://sourceforge.net/project/showfiles.php?group_id=204414&package_id=...) compiled it without problems, but mingw32-gtk+ don't recognice it doing configure.

Could we compile mingw32-gtk+ without GDI+ and mayby someone could
figure out why libtiff check fails ?

/Mikkel

[Richard W.M. Jones]

[Note that mingw32-gtk2 is in Fedora, but we're not yet building it
because there are some unreviewed dependencies:
https://bugzilla.redhat.com/show_bug.cgi?id=467408 mingw32-jasper
https://bugzilla.redhat.com/show_bug.cgi?id=467419 mingw32-pango ]

On Fri, Feb 27, 2009 at 02:53:25PM +0100, Mikkel Kruse Johnsen wrote:
> Have had some problems running the gtk-demo on windows (and through
> wine) it fails when loading images.
>
> I talked to "tml" on the #gtk+ IRC and he suggested that mingw32-gtk+
> was compiled without GDI+, so I recompiled it with "--disable-gdiplus
> --without-libtiff" and everyting works fine now. Images is loading.

Do we lose any features by disabling GDI+ support?

We don't have a libtiff package.  Yet Gtk still builds the TIFF pixbuf
loader (libpixbufloader-gdip-tiff.dll).  The libtiff test in Gtk's
configure.in is a bit confusing.  No tiff* messages get printed in the
configure log.

dnl Test for libtiff
  if test x$os_win32 = xno || test x$enable_gdiplus = xno; then
    [...]
  fi

I looked at the gdk pixbuf loader for TIFF and I don't understand how
it can compile without <tiffio.h>.  Perhaps it is erroneously using
the system header file, but that still leaves open the question of
what library it is linking with.
> Trying to get TIFF support, found mingw32-libtiff
> (http://sourceforge.net/project/showfiles.php?group_id=204414&package_id=...) compiled it without problems, but mingw32-gtk+ don't recognice it doing configure.
>
> Could we compile mingw32-gtk+ without GDI+ and mayby someone could
> figure out why libtiff check fails ?

Got any patches that we can review?

Rich.

[Richard W.M. Jones]

I got the skinny on this from my contact at SUSE.

GDI+ is theoretically the best choice, since it's a native Win32
library that can load many different image formats.  It's what Gtk
will use by default if detected, and indeed it's what our mingw32-gtk2
package uses.  However _in practice_ this fails with images over a
certain size (bugs in Windows?  who'd have thought!).

So he recommends disabling GDI+ when compiling Gtk.  This means we
will need a mingw32-libtiff library if we want to support TIFF.

SUSE's packages also link the pixbuf loaders statically to avoid the
gtk-pixbuf.loaders configuration file.  He also tells me he links
pango's IM-modules statically to avoid another config file,
gtk.immodules.  That sounds like an excellent idea because we go
through hoops in nsiswrapper to create both these config files in the
right place with the right contents.

Anyone wants to have a go at making a patch for the above, please post
it on the list.

Rich.

[Mikkel Kruse Johnsen]

Hi

Just found out that the reason tiff was not being detected was because I
had to run "i686-pc-mingw32-ranlib" on the DLL files. mingw32-gtk2 is
now compiling with TIFF support from this package
http://sourceforge.net/project/showfiles.php?group_id=204414&package_id=...

I will see if I can compile it statically. For now just add
"--disable-gdiplus" to the configure line in the spec file.

Med Venlig Hilsen / Kind Regards

Mikkel Kruse
Johnsen
Adm.Dir.

Linet
Ørholmgade 6 st tv
Copenhagen N 2200
Denmark

Work: [phone]
Mobile: +45
21287793
Email:
[e-mail]
IM:
[e-mail]
(MSN)
 Professional
Profile
Healthcare

Network
Consultant

søn, 01 03 2009 kl. 19:00 +0000, skrev Richard W.M. Jones:
> I got the skinny on this from my contact at SUSE.
>
> GDI+ is theoretically the best choice, since it's a native Win32
> library that can load many different image formats.  It's what Gtk
> will use by default if detected, and indeed it's what our mingw32-gtk2
> package uses.  However _in practice_ this fails with images over a
> certain size (bugs in Windows?  who'd have thought!).
>
> So he recommends disabling GDI+ when compiling Gtk.  This means we
> will need a mingw32-libtiff library if we want to support TIFF.
>
> SUSE's packages also link the pixbuf loaders statically to avoid the
> gtk-pixbuf.loaders configuration file.  He also tells me he links
> pango's IM-modules statically to avoid another config file,
> gtk.immodules.  That sounds like an excellent idea because we go
> through hoops in nsiswrapper to create both these config files in the
> right place with the right contents.
>
> Anyone wants to have a go at making a patch for the above, please post
> it on the list.
>
> Rich.