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1991-10-13
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================================================================================
GIF_view (v. 2 / october '91)
by Lorenzo Musto
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Description
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GIF images viewer.
GIF_view is a program that allows to view all images wich data
are organized following the GIF format.
All strategies taken to manage the decoding algorithm plus a direct
image's assembling in memory ( i.e. without calls to any graphic
primitive like 'WritePixel') allow to reach relatively low decoding
times.
This program suits perfectly on PAL systems becouse it totaly uses
the avaible display area (256/512 lines);
it works right on those NTSC too.
The program starts execution showing some image and screen's details
obtained from input file. These will be adapted to the amiga graphic
system allowing scrolling for large images and using HAM-mode for those
ones with more than 32 colors; then will start the decoding step wich
output is a dot sequence.
After a while, whether all gone well, the image should appears.
At this time the program will be stopped for about twenty seconds;
then it goes over to terminate unless the user has hit one of the
following keys:
- Carriage Return that causes an early exit .
- Space Bar or Arrow Keys that hangs the program to a Carriage Return.
No action can be taken to abort execution until the image appears
(any attempt at your own risk: it's probable a loss of memory).
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Usage/Template
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GIF_view <filename> [QUICK]
option QUICK allows to gain 'speed, resolution, memory'
but to the detriment of image's color features.
Explanations about keyboard usage will be given during
program's running.
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Author
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Home Address: Lorenzo Musto
via A. Cantele 11
35129 Padova (Italy)
Internet address: maciste@alessia.dei.unipd.it
Phone: +39 49 609356
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Notes
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Contact me for every issue about this work ( preferely via e-mail ).
If you are pleased about it simply spread it but remember that gifts
of any type (floppies,cards,cakes whatever you think ... even $) as
counterpart are welcomed.
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History
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o ??-may-91 first version but prototype.
o ??-aug-91 first release.
o 02-oct-91 Idiosyncrasy for B&W images removed.
o 02-oct-91 Approximation of the 'Colors Map' refined.
o 04-oct-91 Fixed a bug.
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Trademarks
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G I F (tm)
Graphics Interchange Format (tm)
A standard defining a mechanism
for the storage and transmission
of raster-based graphics information
June 15, 1987
(c) CompuServe Incorporated, 1987
All rights reserved
GIF and 'Graphics Interchange Format' are trademarks of
CompuServe, Incorporated.
an H&R Block Company
5000 Arlington Centre Blvd.
Columbus, Ohio 43220
(614) 457-8600
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