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.
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