Re: GdkPixbuf pixel data weirdness

["Chris Garrett" <garrett91 hotmail com>]

Thanks Evan!

It was a rowstride problem.  I did not realise that the width of each row 
was not equal to the number of pixels * 3 (in 8bpp mode) or 4 if an alpha 
channel was added.

Why is this?  What are the padding pixels used for at the end of each row? - 
is it so that the start of the next row is word aligned?  I could not find 
anything in the docs apart from the gdk_pixbuf_get_rowstride() function 
call, which simply defines rowstride without an explanation.

Best regards,

Chris.




> From: Evan Martin <martine cs washington edu>
> To: Chris Garrett <garrett91 hotmail com>
> CC: gtk-app-devel-list gnome org
> Subject: Re: GdkPixbuf pixel data weirdness
> Date: Sun, 9 Mar 2003 19:04:43 -0800
>
> On Sun, Mar 09, 2003 at 09:31:38PM +0000, Chris Garrett wrote:
> > I changed the size of the pixbuf and things went pearshaped.  When the
> > width of the pixbuf is a multiple of 4, it works (20, 24, 28...).  With 
> any
> > other width, its as though I have offset the data somehow - the pixbuf
> > appears striped and the border comes in diagonally.
>
> Looks like a rowstride problem.  Look for "rowstride" in the docs.
>
> --
>       Evan Martin
> martine cs washington edu
>   http://neugierig.org
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list


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