Composition speed improvements

Over the years I have heard people complain that image composition is 
slow.  Yesterday I completed a composition overhaul which has been 
planned for four years now.  The result is in CVS head and the latest 
(1.3.020080602) development snapshot.

The new implementation is based on a pixel iterator interface 
framework that I invented in 2004.  Using this interface allows each 
composition operator to be as fast as it can be.  It is difficult to 
imagine how the channel copy operators (Copy, CopyRed, CopyGreen, 
CopyBlue, CopyOpacity, CopyCyan, CopyMagenta, CopyYellow, CopyBlack) 
could be any faster without resorting to assembly code.  Floating 
point intensive composition operators are observed to be faster since 
the compiler is able to optimize them better.

Please let me know about any bugs you may find.

Bob
======================================
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/


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