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Re: [patch] add "underwave" face attribute

From: Alp Aker
Subject: Re: [patch] add "underwave" face attribute
Date: Sun, 5 Feb 2012 20:14:42 -0500

Aurélien Aptel wrote:

> Are you sure this won't break the rest of the code? (which relies
> heavily on clipping) It sure looks cleaner but the rest of the code
> uses ns_focus/unfocus.

Fairly sure.  What's needed here is a temporary change to the graphics state in the middle of a redisplay; we change the clipping rectangle, draw the underwave, then restore the previous clipping rectangle, if any.   ns_focus/ns_unfocus can't be used to do that; they're intended to be used at the beginning and end of redisplay.  

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