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83 lines
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83 lines
3.5 KiB
HTML
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<h1>A GIMP Image Compositing Subsystem</h1>
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<quote>
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Update. The latest version of this code will be available in the
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cvs version of The GIMP "real soon now." Instead of tracking this
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software separately, you can simply wait for it to show up in CVS.
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</quote>
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<p>
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On Februrary 26, 2003 I volunteered to help with the GIMP <abbr
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title="Intel Multimedia Extensions">MMX</abbr> implemetation
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that had been languishing and had recently started to cause
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problems when building the current GIMP code.
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</p>
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<p>
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<a href="gimp-composite.tgz">This</a> is release 0.0 of an extensible and customisable image
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compositing interface for the GIMP. I'd like to hear feedback.
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</p>
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<p>
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What you get is this:
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</p>
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<ul>
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<li style="margin-bottom: 1em;">
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A general mechanism for incorporating compositing functions based
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upon the compositing function and the pixel formats of the inputs and
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the outputs of the function.
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</li>
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<li style="margin-bottom: 1em;">
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Generic implementations of the supported compositing functions as a
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foundation for further/future improvements. You can see this code in
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gimp-composite-generic.c which is a direct "port" of the existing GIMP
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code which does the same.
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</li>
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<li style="margin-bottom: 1em;">
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The general mechanism allows any compositing function
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implementation to be replaced by a different implementation that is,
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for example, customised for the target CPU, or pixel formats, hardware
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acceleration, and so forth. You can see this sort of code in
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gimp-composite-mmx.c which contains implementations of several
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compositing functions optimised with MMX assembly code.
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</li>
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</ul>
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<h2>Caveat</h2>
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<p>
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While I've been using this code, and working out the various problems
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as they occur, this code is still immature and you may experience
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problems. If you do, please tell me.
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</p>
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<h2>Installation</h2>
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<p>
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To use this you :
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</p>
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<ul>
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<li style="margin-bottom: 1em;">
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Untar the gimp-composite.tgz tarball,
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<pre style="border: 1px solid purple; padding: 1ex;">% tar xzf gimp-composite.tgz</pre>
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</li>
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<li style="margin-bottom: 1em;">
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Edit <tt>gimp-composite/Makefile</tt> to set the values of three variables
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to correspond to your local environment. For example, my values are:
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<pre style="border: 1px solid purple; padding: 1ex;">
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GLIBINCLUDE=/home/helvetix/garnome/include/glib-2.0
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GLIBLIB=/home/helvetix/garnome/lib/glib-2.0/
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GIMP=/home/helvetix/Gnome/gimp</pre>
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Note that the <tt>GIMP</tt> variable points to a clean cvs checkout of the
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gimp-1.3 source code, <b>not</b> the path name of the gimp executable.
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</li>
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<li style="margin-bottom: 1em;">
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In the gimp-composite/ directory, execute "make install"
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<pre style="border: 1px solid purple; padding: 1ex;">% cd gimp-composite ; make install</pre>
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</li>
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<li style="margin-bottom: 1em;">
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In the gimp-1.3 source directory, execute "autogen.sh && make"
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<pre style="border: 1px solid purple; padding: 1ex;">% cd gimp ; ./autogen.sh && make</pre>
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</li>
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<li style="margin-bottom: 1em;">
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You can install the resultant gimp, or you can run it in place.
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</li>
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</ul>
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<p>
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Enjoy! Comments, feedback, complaints to me: HELVETIX Mysterious.ORG
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</p>
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