Description
-----------
This program is a simple but very fast jpeg viewer for Amigas having
a PPC inside and WarpOS running.
The viewer supports as far as I know all image types of JPEG and opens
a window on a public screen (default: default public screen).
The public screen must be running under CyberGraphX or Picasso96 in
Hi/True-Color (>=15 Bit).
PPCjpeg is also able to display images which are bigger than your
Workbench screen, you can scroll around in the image (using scroll-bars
and/or the cursor keys).
The cursor key-scrolling supports the following types:
- 20-pixel scrolling (just press the cursor keys)
- 200-pixel scrolling (press SHIFT together with the cursor keys)
- single pixel scrolling (ALT and the cursor keys)
- "border jumping" (ALT, SHIFT and the cursor keys together)
The program also displays the file name, size (pixels), raw-size (kb/MB)
and the type (COLOR, GRAYSCALE) of the loaded JPEG image.
PPCjpeg also supports to save the decoded image as PPM-file (just use
the menu entry "Save as PPM...").
Usage
-----
PPCjpeg File/M,Left/N,Top/N,Width/N,Height/N,Center/S,AbortLeft/S,PubScreen/K
File : filename of an JPEG-image or nothing -> FileRequester
Left, Top : left/top-Edge of the window (optional)
Width, Height: max. width/height of the window (optional)
Center : centers the window on the screen (optional)
AbortLeft : close the window with a simple left mousebutton click
PubScreen : name of a Hi/TrueColor-Public Screen to open the window on
(optional)
Example: PPCjpeg dh4:image4.jpg Center
(opens the picture "dh4:image4.jpg" centered on the workbench)
Requirements
------------
o AmigaOS 3.x+ (successfully tested with OS 3.1 and 3.0)
o CyberGraphX or Picasso96 with a Workbench running in HiColor (>=15 Bit)
o enough RAM to hold the complete image data (>=32MB recommended!)
o PowerPC-Board
o WarpOS, successfully tested with WarpUP Release 3, but works also under V7
(Thanks to Robert Nilsson for reporting this to me!)
WarpOS is available at www.haage-partner.com under the PPC download area.
Distribution
------------
PPCjpeg is FREEWARE. I would be happy to get an eMail if you like/use
it or if you have any questions about this program.
This JPEG viewer is based on the sources of the Independent JPEG Group (V6b).
Future
------
- Multible file support for the requester & dos parameters
- Additional fileformats
- New GUI
- Zooming
- Rotation
- and all of your ideas... ;)
History
-------
V1.0: (30.12.98)
** first public release **
V1.1: (02.01.99)
- Added an ASL-Requester if no filename is specified
Thanks to Lars Broweleit for this suggestion!
- Added PublicScreen-support (keyword "PubScreen")
Thanks again, Lars!
- Removed the superbitmap-stuff and replaced it by own scrolling
routines (-> much faster). This should save also a little
bit memory...
- Added <Esc> button event to close the window by keyboard
Thanks to Audun Evensen for this suggestion!
- Added full keyboard-support (scrolling with cursors, shift, alt)
- Added the Keywords "Center", "Left", "Top", "Width", "Height" for
pre-defined window-positions
- Improvements of the error abort function
- Now it's possible to save the decoded image as PPM-file!
V1.11: (03.01.99)
- dramatically speedup on window refreshes
V1.12: (11.01.99)
- Sven Ottemann told me that there are JPEG-images which cannot
be shown with PPCjpeg V1.1, these image files have illegal
headers, I changed a little bit to ignore those headers.
Many thanks for this info, Sven!
- Changed the window menu to newlook, forgot to set the flag...
- Now PPCjpeg only displays the filename without the whole path
in the window-titlebar
V1.2: (15.01.99)
- Fixed (finally) the bug which prevented PPCjpeg to read all
jpeg files. The problem was an illegal jpeg format saved
with "Adobe Photoshop"... I removed this problem by using the
latest sources of "The Independent JPEG Group" (V6b).
- Added the tooltype "AbortLeft" which allows to close the window
with a simple left click on it...
Thanks to Manfred Ambros for this idea, I like it! :)
- Added wheelmouse support. This is yet untestet but it should work...
Thanks to Audun E. for this idea!
V1.21: (18.01.99)
- Increased the jumps with wheelmouse by three (Thanks Audun!).
- Finally removed the NewLookMenu-bug... well, CGX displayed it on
my computer always right... grrr... :) (Thanks to Tim Riedel!)
V1.22: (17.03.99)
- Removed a problem with refreshing window, now it should work
correctly. Thanks Audun for reporting this... ;)
- Added the new mousewheel (left-right)-functions provided by
newmouse (by Alessandro Zummo). Thanks Audun!
- PPCjpeg should now be about at least 8-10% faster than 1.21 and
below because I now use the newest StormC linkerlibs... ;)
I also raised the height of the decode-stripe to 150 pixels,
this minimizes the context switches a little bit more and
I think that decoding is now even faster... :)
Author
------
Stefan Robl <stefan.robl tirnet.de>
More infos about ArtecScan, PPCjpeg and my other Projects?
Just visit my Homepage: http://www.tirnet.de/~srobl
Have fun!
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