[RFC] Reading images

[Adam Fedor]

I've implemented support for NSBitmapImageRep's initWithFocusedViewRect:
by changing the backend method NSReadPixel: to GSReadRect: (the
NSReadPixel function could be implemented in terms of GSReadRect
anyway).

I implemented it in the xlib backend.  Perhaps Alex could give me a hint
of how to do it in the art backend (or maybe do a quick hack himself :-)

Seem ok?

read.patch
Description: Text document

readback.patch
Description: Text document