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ZGIFDatatype39.3.Doc
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ZGIFDatatype 39.3
August '93
Another FAST Utility Written by Michael Zucchi
This is a replacement for any of the other gif datatypes available, and its
main improvement is SPEEEEEEEED!
I don't have any timings, but i'd estimate at least a 3 to 4x speed
increase over the other releases, and much more than that if working
off of a floppy disk, due to async reading routines. This is on an A1200.
It _requires_ a 68020+ processor, and of course release 3.0+ system
software.
Main features:
Its FAST. It uses the FASTEST gif decoder in the Amiga world.
It should even be fractionally faster than ZGif04 (i don't believe
it, i left an ENTIRE register free before! :)
Should support almost any basic gif.
Uses async file reading for greater performance - on an A1200 will
load a picture the same speed off of floppy as off of hard drive!
100% Assembly language, very optimised.
Its _FREE_! (so any abnormal operaion is not my responsibility :)
Whats wrong with it then?
Does not suport OM_SAVE BOOPSI method. I don't know the BOOPSI
side of how to do it, and i haven't written an encoder yet.
Only decodes pictures with a global colour table.
Ignores any local colour tables (but still decodes picture)
To install:
Copy the gif.datatype file into your sys:classes/datatypes/ drawer
Copy the Datatypes/GIF file (and its icon) into DEVS:Datatypes/
Thats it!
To contact the Author:
I can be reached via email at:
9107047w@lux.levels.unisa.edu.au
I'd like to hear about any major/minor bugs.
I'm a _poor_ student currently doing 3rd year Computer Systems
Engineering at The University of South Australia.
(So, if ya want, please send me $$!)
Thanks to the guys who supplied me with those odd (and i mean _odd_ :)
gif's to test some of the weirder stuff.
Thanks also to C= for making such a _cool_ OS.
(Hey C=, do i have to test to see if i got my memory for setting up the
colour tables? bmp.datatype doesn't?)
- Michael Z
History
39.0 Initial version
39.1 Now does any depth gif, not only 4 or 8, used to ignore.
39.2 Now supprts interlaced gifs, used to ignore.
39.3 Added better viewmode selection via BestModeID(), uses
the 'workbench' monitor (if possible).