Re: sprite map issues using gdk_pixbuf_composite()

[David Nečas <yeti physics muni cz>]

On Wed, Oct 29, 2014 at 09:11:07PM -0500, Greg Donald wrote:
> I'm having problems trying to chop sprites out of a sprite map.  I can
> get my first sprite from the top left corner with this:
>
> gdk_pixbuf_composite( sprite_src, sprite_buf,
>                       0, 0, sprite_w, sprite_h,
>                       0.0, 0.0, 1.0, 1.0,
>                       GDK_INTERP_HYPER,
>                       255 );
>
> But then I cannot get my second sprite that is just to the right of
> the first one:
>
> gdk_pixbuf_composite( sprite_src, sprite_buf2,
>                       sprite_w, 0, sprite_w * 2, sprite_h,
>                       0.0, 0.0, 1.0, 1.0,
>                       GDK_INTERP_HYPER,
>                       255 );
>
> The first one looks great but I get a black rectangle and a failed
> assertion on the second one:
>
> GdkPixbuf-CRITICAL **: gdk_pixbuf_composite: assertion 'dest_x >= 0 &&
> dest_x + dest_width <= dest->width' failed
>
> I have tried everything I can think of.  Any idea what I'm doing wrong?

You must change offset in the source, not position in the destination.

Yeti