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EnigmA Amiga Run 1995 October
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EnigmA AMIGA RUN 01 (1995)(G.R. Edizioni)(IT)[!][issue 1995-10][Aminet 7].iso
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ShowGIF.doc
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1993-06-21
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ShowGIF V1.01
(C) 1993 by Christophe PASSUELLO
--------------------------------
ShowGIF is a GIF viewer, it takes advantage of the new AGA chipset, it
allows scrolling, it support wild-card and Workench. It's always the
FASTEST GIF viewer on Amiga.
ShowGIF can't be sold alone or in any package, but you can freely
distribuate 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 ShowGIF use.
REQUIREMENTS
------------
Before starting ShowGIF, you must be sure to have the Arp.library in your
LIBS: directory.
PRESENTATION
------------
ShowGIF 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.
With ShowGIF you can't specify contrast and brightness for gray-scaled
pictures, to do this check out for FastGIF II my GIF viewer with an user
interface (Saving to IFF with registered version).
There is still some little problems with AGA chipset: when you use hires
switch during display the image may looks strange, these little problems
will be fixed as soon as i will receive docs about the new libraries of
WorkBench 3.0.
FEATURES
--------
- Can be run from WorkBench or CLI.
- Automaticly adjust screen size regarding picture size.
- 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 displays GIF89a files.
- It works on NTSC or PAL.
- You can scroll picture.
- It handles corrupted GIF files.
- Completly multitasking.
- Multiple wild-card for slide-show.
- ShowGif is pure
RUNNING ShowGIF WITH CLI
------------------------
ShowGif is now pure so you can, you can make it resident.
Usage: ShowGIF <Patterns> [-aga] [-low] [-all] [-agif]
You can specify more than one pattern in the command line.
Example: ShowGIF df0:*.gif dh0:GIFPictures/* GIF:A*
-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. (May slow down decompression).
-aga : Set this flag if you have a new Amiga with AGA chipset.
-all : With this flag, ShowGIF will scan recursivly all directories
from the specified directory.
-agif : Set this flag if the GIF pictures come from Amiga. It is used
to do a better guess of picture ratio.
ShowGIF will display pictures one after each other, you can stop ShowGIF
with a CTRL/C.
RUNNING ShowGIF WITH WORKBENCH
------------------------------
Click on the icons of disks, drawers and files to view while holding down
the SHIFT key, and double-click on the ShowGIF icon.
You can set the following Tools Types (With Info item of WorkBench menu).
LOWMEM=ON : 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. (May slow down decompression).
CHIPAGA=ON : Set this flag if you have a new Amiga with AGA chipset.
ALL=ON : With this flag, ShowGIF will scan recursivly all directories
from the specified directory.
AMIGAGIF=ON : Set this flag if the GIF pictures come from Amiga. It is
used to do a better guess of picture ratio.
ShowGIF will display pictures one after each other, you can stop ShowGIF
with a CTRL/C.
ONCE RUNNING
------------
Once ShowGIF displays the picture, 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.
TO DO
-----
- Double buffering ?
AUTHOR
------
Send me any suggestion, bugs-report, flames, donations, etc....
I'am looking for docs about the graphics.library to use 24 bits palette,
to look for avaible display mode (sources, examples, includes and LVOs),
to improve this viewer.
I'm looking also for docs about PCX, PIC and BMP or other format to write a
multi-format viewer.
For bugs-report send informations about your config:
ShowGIF 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
-------
* ShowGIF use the great Arp.library for pattern matching.
* GIF Format is Copyright (c) CompuServe Incorporated.
* Thanks to Thierry Andeol and Arto Ikola for beta-testing and suggestions.
HISTORY
-------
- RELEASE V1.00
First release.
- RELEASE V1.01 (Jun 21 1993)
ShowGif is now pure.
Best AGA support (64 bits aligned bitmap width, 24 bits palette).
AppIcon for workbench 2.x
Small bugs fixed.
---------- Enjoy GIF on Amiga ----------