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view.doc
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1994-05-04
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View V2.0 - ANIM/ILBM Viewer
View is a program that allows you to view all ANIM opcode 5 or
6 animations and all ILBM IFF format pictures. You can also view
RGB Raw (Sculpt), or Pro RGB files. This viewer program is freely
re-distributable. This means that you may distribute it to anyone,
or anywhere that you so desire providing that this unaltered file,
and the original unmodified program are distributed together.
View 2.0 supports IFF ANIM OpCode 5 animations. This is the
standard ANIM format that has been adopted by the Amiga
community. Old animations from VideoScape, & HASH Enterprises
may NOT be OpCode 5. Some ANIM and ILBMs have non-standard
methods of filling the Bitmap Header structure. Meaning that the
values are not what View or other viewers expect. This is very
unfortunate and impossible to detect. Therefore View will ignore
the questionable values and insert the values that are set in the
users preferences. This way ALL pictures and animations will be
centered onto your display (that is if your preferences places
your WorkBench screen into the center of your monitor's display).
This also is useful for those of you that have Flicker-Fixers
connected.
OpCode-6 Animation is my own creation and has not been
recognized as a standard IFF ANIM format by Commodore. The format
is exactly the same as OpCode 5 but is QUAD buffered instead of
DOUBLE buffered. This allows the player to show 2 screens at one
time for the X-Specs Glasses. Each picture MUST be viewed for
1/60th of a second, therefore to see a 3D-Picture the viewer can
only play ANIMs at 30 frames per second. (2 pictures = 1 frame).
Once I hear from Commodore the OpCode may or may not change
depending on whether OpCode 6 has been taken already, so don't
write any code that may depend on it. There is a problem
inherent in this QUAD buffering technique! The problem is in the
fact that standard Amigas only have 512K of CHIP ram, and some is
taken for the workbench screen. But since you probably haven't
got an animation that is Op-Code 6 (since I haven't released any
yet, and 3D Professional isn't out yet to make your own) these
problems are not yours. I will attempt to do some memory magic
to require only 2 of the four bitmaps to be in chip ram at one
time. But I have a feeling that this will cause the animations
to slow down, due to data swapping that may or may not need to be
done.
The programs execution should be fairly easy to understand. To
view a single animation or picture either run view from CLI
passing it the filename, or click onto the PROJECT icon of the
file.
Example: if desired ANIM is named "foo.anim"
<CLI> 1> view foo.anim
<WORKBENCH> double click the "foo.anim" icon. The icon
MUST be a project type icon, with its DEFAULT
TOOL set to point to the View
program.
To view multiple animations or pictures simply run the view
program with no arguments. A file requester will appear and you
may select a file. After viewing the picture or animation the
file requester will reappear.
When you have seen enough click on the CANCEL gadget in the file
selector.
Example:
<CLI> 1> view
<WORKBENCH> double click the "VIEW" icon.
VIEWING CONTROLS:
<ESC> stops viewing for an animation or picture.
<ARROWS> move the view offsets of the picture or
animation.
<FUNCTION KEYS> change the playback speed of the animation.
<RETURN> Default speed. This will use the timing
information in the
ANIM file for its speed. This option is DEFAULT
on.
<SPACE> Freezes the animation at the current frame.
<a> Advances forward one frame. (must first freeze it of
course).
To view RGB pictures simply select the file to view. If it is
a Raw-RGB file it must use the standard ".red", ".grn", ".blu"
extensions. You will be prompted for an input resolution and an
output format. If the RGB file is in Pro-RGB format the input
resolution can not be modified. Once the output format has been
selected you can click on the "SHOW", "SAVE", or "CANCEL" buttons.
If you select "SAVE" the picture will be shown and when you press
the <ESC> key you will be prompted for a filename to save with.
If you are not sure whether you wish to save the picture or not
select the "SHOW" button. After viewing the picture pressing the
"S" key will save the picture.