I am trying to gain a very technical understanding of how X maps coordinates on the 2d screen to objects. For example, there are many applications running with graphical interfaces to them active on the screen, and each application interface has dozens (if not hundreds) of objects. Some objects are contained within other objects.
So, what I am trying to learn more about is how X maps a screen coordinate (and an action like a mouse click) to an object quickly. In particular, when there are objects within objects, how it narrows the search down to the "smallest" element that your mouse is hovering over when a click event fired. I'd love to know about what data structures and algorithms are used to perform this mapping between the 2D graphical space to objects. Pointers to prior discussion, documentation, code... anything is helpful. Thanks much! - George
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