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1992-10-02
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FastGIF V1.20
(c) 1992 by Christophe PASSUELLO
(Last version before FastGIF II)
--------------------------------
FastGIF is a fast viewer for GIF files, written in C for the user interface
and assembler for unpacking and viewing routines. (The fastest GIF viewer
for Amiga).
FastGIF can't be sold alone or in any package, but you can freely
distribute it on PD's disks (like Fred Fish one) or on any BBS only if
complete and unmodified.
DISCLAIMER
----------
The author isn't responsable of any damages resulting of the use of FastGIF.
BAD
---
- It uses a lot of memory (loading file in RAM), allocates large block (320Kb
for a 640 * 512 pixels pictures)
GOOD
----
- Very fast, mains routines are written using very highly optimised assembler
(twice faster than TurboGIF)
- It should be even faster with 32 bits cards because the assembly routines
are small enough to fit in the cache.
- It should works on NTSC or PAL. (i don't have NTSC)
- You can scroll picture.
- It handles corrupted GIF files
HOW TO USE FASTGIF
------------------
FastGIF displays pictures with more then 32 colors using grey scale, else it
uses colors.
Usage: FastGIF <GIF-File> [-low] [-cNN] [-bNN]
<GIF-File> : GIF filename.
-low : May help you if you are low in memory, for example to display
a 640 * 480 picture with 1 Mbytes. The freeware tool ADD21K
may also help you.
-cNN : Set the contrast for gray-scaled pictures, can greetly improve
the picture. a value of 15 is usually enough.
-bNN : Set the brightness for gray-scaled pictures.
For each picture FastGIF displays size, numbers of colors and so on, ...
Once displayed you can use the keys:
L : switch Interlace
H : switch Hires (only if not a 32 colors picture)
O : switch OverScan
ESC : escape from FastGIF
To scroll picture use the cursor, with SHIFT you can scroll using a 16 pixels
step, with ALT you move to any side of the picture.
The picture is displayed in a intuition screen so you can put the Workbench
in front using the keys Amiga-Left N.
TO DO
-----
- Using colors instead of grey-scale for pictures with more than 32 colors.
- Saving to IFF 1 to 5 bits , 8 bits, 12 bits and 24 bits.
AUTHOR
------
Send me any suggestion, bugs-report, flames, etc....
Any contribution is welcome [free/share]ware or money (bills only).
I'am looking for docs about 256 colors WorkBench to adapt FastGIF on it.
For bugs-report send informations about your config:
Witch processor, version of Workbench, how many RAM you own (CHIP & FAST).
You can contact me at the address
Christophe PASSUELLO
25, Rue du Plateau
91600 SAVIGNY SUR ORGE
FRANCE
HISTORY
-------
- RELEASE V1.00
First release
- RELEASE V1.02
Decompression 5% faster.
Bug fixed : ScrollVPort doesn't works very well with Interlaced. I use
MakeScreen and ReThinkDisplay instead.
- RELEASE V1.10
Now can display pictures with more than 32 colors in gray-scale.
Pictures are now centered in the middle of the screen.
- RELEASE V1.11
Internal release.
Fast scrolling added.
- RELEASE V1.12
New algorithm for decompression: 25 % FASTER.
- RELEASE V1.13
Bug fixed: palette colors wasn't good.
- RELEASE V1.14 (Sep 15 1992)
-low option added.
- VERSION V1.20 (Oct 1 1992)
GIF parsing completly rewritten, much safer than before.
Now support GIF89a files.
Options for contrast and brightness added.
GIFInfo added to the archive.
-------------
Enjoy FastGIF !!!!!!!!!!!