RE: gdk_pixbuf_new_from_file_at_scale() returning error saying "Unrecognized image file format" when loading png files

[<avijit manna wipro com>]

Hi,

On further debugging I could see the below behaviour:

1. _gdk_pixbuf_get_module receives the buffer header as:<89>PNG
2. But when it fetch the mime_type on that buffer it is getting mime_type:application/octet-stream which should be image/png.

Due to this there is a type mismatch in mime_type and hence it is returning error with "Unrecognized image file format".

Any idea which could be the reason for this mime_type mismatch?

Regards,
Avijit


________________________________________
From: Avijit Manna (WT01 - PES)
Sent: Tuesday, June 12, 2012 4:33 PM
To: gtk-devel-list gnome org
Subject: gdk_pixbuf_new_from_file_at_scale() returning error saying "Unrecognized image file format" when loading png files

Hi,

I have built weston with wayland (wayland 0.85). When I try to run weston server it is loaded properly but the cursor is not displayed.

When I dig into more detail and put some logs I could see that following functions are getting called:
create_pointer_surfaces()->display_create_surface_from_file()->display_create_egl_image_surface_from_file()-gdk_pixbuf_new_from_file_at_scale().

Now, the function gdk_pixbuf_new_from_file_at_scale() is returning some error value with "Unrecognized image file format" which is resulting in error print "Error loading pointer image.".

I checked the mime database. The mime database is present in /usr/share. But I am installing and using my local directory for all my source code. My directory is /home/avijit/install/ and there is no mime database installed under /home/avijit/install/share. So, do I need to install the mime databse within my environment?? If yes, what is the procedure to do so?

I checked the gdk-pixbuf loader in my environment (/home/install/lib/gdk-pixbuf/2.10.0/loaders) and it is using an external loader. The png loader file is also mentioned in loader.cache.

Here is the output command of ldd:
ldd libgdk_pixbuf-2.0.so
        linux-gate.so.1 =>  (0x004e2000)
        libgmodule-2.0.so.0 => /home/wipro/install/lib/libgmodule-2.0.so.0 (0x00cd8000)
        libgio-2.0.so.0 => /home/wipro/install/lib/libgio-2.0.so.0 (0x00e3a000)
        libgobject-2.0.so.0 => /home/wipro/install/lib/libgobject-2.0.so.0 (0x00ce9000)
        libglib-2.0.so.0 => /home/wipro/install/lib/libglib-2.0.so.0 (0x00110000)
        libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0x003c5000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0x00b35000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0x00981000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0x0060f000)
        libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0x00232000)
        libresolv.so.2 => /lib/i386-linux-gnu/libresolv.so.2 (0x00394000)
        libffi.so.5 => /home/wipro/install/lib/libffi.so.5 (0x002d1000)
        librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0x00c07000)
        /lib/ld-linux.so.2 (0x00247000)
ldd libpixbufloader-png.so
        linux-gate.so.1 =>  (0x00319000)
        libgdk_pixbuf-2.0.so.0 => /home/wipro/install/lib/libgdk_pixbuf-2.0.so.0 (0x0074b000)
        libgobject-2.0.so.0 => /home/wipro/install/lib/libgobject-2.0.so.0 (0x00130000)
        libglib-2.0.so.0 => /home/wipro/install/lib/libglib-2.0.so.0 (0x00bd6000)
        libpng12.so.0 => /lib/i386-linux-gnu/libpng12.so.0 (0x0089b000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0x009da000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0x00180000)
        libgmodule-2.0.so.0 => /home/wipro/install/lib/libgmodule-2.0.so.0 (0x00b00000)
        libgio-2.0.so.0 => /home/wipro/install/lib/libgio-2.0.so.0 (0x0031a000)
        libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0x0047e000)
        libffi.so.5 => /home/wipro/install/lib/libffi.so.5 (0x007b0000)
        librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0x00110000)
        libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0x00119000)
        /lib/ld-linux.so.2 (0x00ec8000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0x002fc000)
        libresolv.so.2 => /lib/i386-linux-gnu/libresolv.so.2 (0x00b7e000)

Regards,
Avijit