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1992-07-14
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GIF_view v. 4 - March 1992
GIF images viewer
plus
GIF to IFF converter
Copyright © 1991,92 by Lorenzo Musto
GIF images viewer plus
GIF to IFF converter .
GIF_view is a program allows to view all images which data
are organized following the GIF format as well as to convert
them into ones matching IFF standards.
This is version 4, of it, which follows the 2 one.
The main improvements were done to make the program more
fast and Intuition-like; with this goal keeped in mind
the decompression phase were redesigned to make it more
efficient and then coded in assembly.
About Intuition compatibility I just attached the image's
bitmaps to a screen, handling as well as possible (for me)
strange situation. Besides I have introduced an overscan
to do nice playing with bigger than screen images.
At this time the program isn't just a fast viewer but comes
with saving function which allows to create an IFF file.
A windmill signals the program's run which may be aborted
by CTRL-C as expected.
All that results in a source code made-up by about thousand
lines of C code mixed to assembly one, allowing to get an
high speed with a low use of memory.
No particular hw/sw is required to run this program;
it suits well on PAL systems as well as on those NTSC.
This work is dedicated to my father.
Author
Contact me for every issue about this work:
paper: Lorenzo Musto
via A. Cantele 11,
35129 Padova (Italy)
e-mail: maciste@alessia.dei.unipd.it ( INTERNET )
alessia.dei.unipd.it!argo!root ( UUCP )
phone: +39 49 609356
Distribution
GIF_view is a
shareware
program.
GIF_view is also a
copyrighted
piece of software.
You may copy or upload archive wherever you choose but only
complete and unchanged. You are not allowed to sell GIF_view
for profit, or include GIF_view on a disk which is sold for
profit, without the author's (Lorenzo Musto) permission.
If you often use it, please pay me a donation of 10 US$ or
equivalent in any cash. Therefore you will get from me one
update service without the troublesome requester. Please send
money and no check.
Usage - Template
GIF_view <filename> [QUICK] [TIME n] [SAVE filename[.iff]]
QUICK allows to gain 'speed, resolution, memory'
but to the detriment of image's color features.
TIME allows to set time-out mechanism to <n> seconds;
default value is twenty.
SAVE allows to save into file <filename> what results
from decompression step, i.e. displayed picture,
following IFF standards.
--------
KeyStrokes
- carriage return
ends displaying phase.
- arrow keys
scrolling.
- numeric keypad
[1..4]
[6..9] active only with images bigger than screen they
allow to scroll around.
[0] refreshes whole display area.
[5] puts screen to back.
- CTRL-C
aborts execution freeing all allocated resources.
Trademarks
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
"ILBM" IFF Interleaved Bitmap, from Electronic Arts.
Electronic Arts[tm] is a trademark of Electronic Arts.
History
o may-91 version 0 but prototype.
o aug-91 version 1
o 02-oct-91 Idiosyncrasy for B&W images removed.
o 02-oct-91 Approximation of the 'Color Map' refined.
o 04-oct-91 Fixed a bug.
o 05-oct-91 version 2.
o nov-91 fall into intuition: screen, overscan.
o dec-91 optimization of code.
o jan-92 appears assembly-code to do critical steps.
o mar-92 set up TIME and SAVE options.
o 08-mar-92 buffered output on writing IFF destination file.
o 10-mar-92 version 4.
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