GdkPixbuf

["Chris Garrett" <garrett91 hotmail com>]

Hi,

I would like to manipulate pixel data in a GdkPixbuf (GTK/GDK/Gnome2.0).  I 
believe that I can get the start of the array of pixels with 
gdk_pixbuf_get_pixels()

Is this simply an RGB array?  If so, how is the information arranged - is 
each successive guchar r, g, b values for each pixel?  Is it a 1D array or a 
2D array?

Also, how are alpha channels handled?  gdk_pixbuf_get_has_alpha() will 
obviously tell me whether there is an alpha channel or not, but where is the 
data for that channel stored?

Finally, is there a recommended way of setting the colour and transparency 
of a specific pixel in a gdkpixbuf.  Do I have to reference the array 
elements directly, or are there helper functions that I have not found yet?

I cannot find a tutorial for these aspects of GdkPixbuf usage, so any code 
snippets that illustrate this would be really useful.

Your help is most appreciated,
Best regards,

Chris.

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