Improving X11.Image

[Mitar]

Hi!

I have made some improvements to Graphics.X11.Xlib.Image. Currently it
is made as a independent library which provides extended functionality
(mostly I was interested in saving screen shots of windows), but I
could be easily moved to Graphics.X11.Xlib.Image. Please see attached
files.

image.c and image.h is additional C code required, Image.hsc is an interface to:

PlaneMask,
allPlanes,
Image(..),
getImage,
getPixel,
writeBitmapFile,
getHeader,
readColors,
getXwdColor,
freeReadColors,
saveImage

Some links:

http://tronche.com/gui/x/xlib/graphics/XGetImage.html
http://tronche.com/gui/x/xlib/utilities/XWriteBitmapFile.html

saveImage is a helper function for saving screen shots.


Mitar
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