Re: loading an image from data, not file

[muppet <scott asofyet org>]

On Jan 19, 2005, at 10:03 AM, zentara wrote:

> Anyways, the code below works fine when loading the image  
> new_from_file, but all I get is a bunch of colored pixels when trying  
> new_from_data.
>
> I'm guessing my "pack" is wrong, since the error I get is
>  Argument "M-^?M-XM-^?M-`\0^PJFIF\0^A^B\0\0d\0d\0\0M-^?M-l\...
> " isn't numeric in pack at ./image-viewport-from-data line 31.

The JFIF is the dead giveaway.  You're passing JPEG-encoded data rather  
than uncompressed image data.

gdk_pixbuf_new_from_data() wants uncompressed, packed 24-bit RGB pixel  
data:
http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf- 
creating.html#gdk-pixbuf-new-from-data


Use Gtk2::Gdk::Pixbuf::new_from_data() if you have created an image out  
of thin air or already have uncompressed data.  See  
Gtk2/examples/inline-images.pl for an example:
http://cvs.sourceforge.net/viewcvs.py/gtk2-perl/gtk2-perl-xs/Gtk2/ 
examples/inline-images.pl?rev=1.1&view=auto

Use Gtk2::Gdk::PixbufLoader if you need to load image data in a  
compressed format (e.g. from a stream or whatever).  Example here:
http://mail.gnome.org/archives/gtk-perl-list/2004-August/msg00017.html


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