Re: extracting a portion of a GdkPixmap

["Brian J. Tarricone" <bjt23 cornell edu>]

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Boncek, John wrote:
> I have a GdkPixmap.  I need to programmatically extract a new GdkPixmap
> from this image based on x- and y-coordinates, plus width and height.  The
> x, y, width, and height parameters will vary too much at runtime to store
> all the copies needed.  Conceptually this seems simple.  But from among
> the enormous number of different image formats and image-manipulation
> functions in GTK/GDK, I can't find a way to do it, after a *lot* of
> searching.

If you just need to copy a region of a GdkPixmap into another GdkPixmap,
you can use gdk_draw_drawable():
http://developer.gnome.org/doc/API/2.0/gdk/gdk-Drawing-Primitives.html#gdk-draw-drawable
Note that you need to create the destination GdkPixmap first, via
gdk_pixmap_new().

If you want to copy a region of a GdkPixmap to a client-side GdkPixbuf,
use gdk_pixbuf_get_from_drawable():
http://developer.gnome.org/doc/API/2.0/gdk/gdk-Pixbufs.html#gdk-pixbuf-get-from-drawable

        -brian

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