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FastGIF II V1.01
(c) 1992,93 by Christophe PASSUELLO
-------------------------------------
FastGIF II is The GIF viewer. This new version has been rewritten, now
there is a real user interface, a file-requester, gadgets, and also
short-cut, now you can display picture in a screen as before and in a
WorkBench window. FastGIF II takes advantage of the new AGA chipset.
It's always the FASTEST GIF viewer on Amiga.
FastGIF II is now SHAREWARE, so if you use it often send me a contribution
of 10 US$ or 50 French Francs (bills only), you will receive the registred
version of FastGIF II with IFF saving. If you live out Europa add 4 US$
or 20 French Francs for mailing.
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. Distribution of registred version is FORBIDEN.
DISCLAIMER
----------
The author isn't responsable of any damages resulting of FastGIF II use.
Before starting FastGIF II, you must be sure to have the Reqtools.library
and the iff.library (for registred version) in your LIBS: directory.
PRESENTATION
------------
FastGIF II displays pictures with more than 32 colors using gray-scale,
and using color if the picture don't have move than 32 colors. If you own
a new Amiga with AGA chipset (A1200 & A4000), display will use colors even
with a 256 colors picture.
FastGIF II has been succesfully tested on a A1200 with WorkBench 1.3, there
is still some little problems with AGA chipset, the palette used is a 12 bits
palette instead of a 24 bits palette, and when you use hires switch during
display the image may look strange, these little problems will be fixed as
soon as i will receive docs about the new libraries of WorkBench 3.0.
BAD
---
- It uses a lot of memory (loading file in RAM), allocates large block (320Kb
for a 640 * 512 pixels pictures).
GOOD
----
- Now with a user interface, file-requester, iconify and so on.
- 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. (I suggest you to set on the cache
instruction using CPU or SetCPU)
- It should display GIF89a files (I don't have GIF89a files so if it doesn't
works send-me some GIF89a files)
- It should works on NTSC or PAL. (i don't have NTSC)
- You can scroll picture.
- It handles corrupted GIF files
- Completly multitasking
RUNNING FASTGIF II WITH CLI
---------------------------
You can use one option:
Usage: FastGIF [-low]
-low : This can you help when you are low on memory, with this option
you can display a 640*512 picture with 512 KB CHIP and 512 KB
FAST.
I suggest you to set this option in FastGIF II using the Options Window.
RUNNING FASTGIF II WITH WORKBENCH
---------------------------------
Just double-click on the FastGIF II 's icon. You can set the following Tools
Types before running (With Info item of WorkBench menu).
CHIPAGA=ON to use AGA chipset
LOWMEM=ON if you don't have much memory.
This options can be set in FastGIF II using the Options Window.
HOW TO USE FASTGIF II
---------------------
Once loaded, you can see 6 buttons and two text areas, the small one gives
information about the current file, the big one tells what FastGIF II is
doing. Underlined letter are short-cut.
I BUTTON LOAD
-------------
Opens a file-requester, if you choose a file it will be loaded in ram and
decompressed, picture size and so on will be printed on Information area.
If you wait until the file requester has scanned all the directory, the
next time you won't have to wait: the directory will be in the buffer.
II BUTTON VIEW
--------------
First open a window with viewing options:
- You can choose between a screen and a WorkBench window for displaying
pictures. If you choose the WB window, the WorkBench must have enough
colors else the picture will be converted in gray-scale if the WorkBench
has at least 16 colors. With this mode 256 colors graphics cards that
emulate WorkBench may works (Tell me if it works)
- For screen display you can choose hires, interlace and overscan.
- For gray-scale converted picture you can choose brightness and contrat.
Contrast can greetly improve the quality of picture (a value of 15 is
usually enough).
* Once the screen is displayed you can use the following keys:
L : switch Interlace
H : switch Hires
O : switch Overscan
ESC : close the screen
To scroll picture use cursor keys, with SHIFT scrolling will use 16 pixels
step, with ALT you to go to border of the screen. Click on right mouse
button to close the screen.
* Using WB window:
You can change window size, use scroller to scroll picture in window,
using the CloseWindow gadget or ESC key you will close window.
III BUTTON SAVE
---------------
WARNING! IFF saving is only available with registred version.
A requester let you choose options:
- You can choose to save the picture with all its colors (Without
conversion) or to convert picture to gray-scale (contrast and bright-
ness are those used in VIEW part.)
- Compression tells if you want to compress pictures, no compression is
useful if you power-pack pictures.
A filerequester let you choose the filename.
IV BUTTON ABOUT
---------------
Tells some info about FastGIF II.
V BUTTON OPTIONS
----------------
This will allow you set FastGIF II options:
- 256 Colors must be set to use 256 colors modes (You must have AGA chipset
or may be a 256 colors graphic card).
- Low memory may help you if you are low in memory.
- Will free memory used by current file when iconified, so once iconifed
FastGIF II will only use 40 KBytes of memory.
IV ICONIFY
----------
Just iconify FastGIF II.
TO DO
-----
- Using colors instead of grey-scale for pictures with more than 32 colors. ?
AUTHOR
------
Send me any suggestion, bugs-report, flames, donations, etc....
I'am looking for docs about the new graphics.library of WorkBench 3.0
especially how to use the 24 bits palette of AGA chipset (prototypes and
LVOs). I'm looking also for docs about PCX, PIC and BMP file format.
For bugs-report send informations about your config:
FastGIF version, witch processor, version of Workbench, how many RAM you
own (CHIP & FAST), ...
You can contact me at the following address:
Christophe PASSUELLO
25, Rue du Plateau
91600 SAVIGNY SUR ORGE
FRANCE
CREDITS
-------
* FastGIF II uses the great ReqTools.library, copyright (c) by Nico François.
* Iconify routine based on Iconify by Leo L. Schwab (available on Fred Fish
Disk 126).
* GIF Format is Copyright (c) CompuServe Incorporated.
* iff.library is Copyright (c) Christian A. WEBER.
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.
- VERSION FASTGIF II V1.00 (Jan 31 1993)
Completly rewritten version.
Now FastGIF II is SHAREWARE.
Intuition User Interface added (Gadgets, requester, iconification).
There is now a filerequester.
Viewing routine rewritten.
You can now view pictures in a Workbench window.
You can run FastGIF II from WorkBench
LZW decompressing 68020+ version added.
Now supports the new AGA chips.
IFF saving added (with registred version).
- VERSION FASTGIF II V1.01 (Feb 04 1993)
Now cut corrupted part of the picture.
Small bug in the text area fixed.
-------------
Enjoy FastGIF !!!!!!!!!!!