Non-clipping clips(wasRe: [cairo] Alpha masks)

[Keith Packard]

Around 19 o'clock on Jan 6, Owen Taylor wrote:

> The intuitively expected definition of how the clip operates follows 
> from that:
> 
>  ((src Op dest) In clip) Add (dest Out clip)

I like it.  It has a nice 'obviousness' about it.

-keith


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