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C_V43-DT.readme
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1998-10-31
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Short: How: OS3 V40/43 PicDatatype in 100% C
Author: Andreas_Kleinert@t-online.de
Uploader: Andreas_Kleinert@t-online.de
Type: dev/c
samplePNM.datatype and source-code V43.20 (4.9.98)
(C) 1996-97 by Andreas R. Kleinert. All rights reserved.
---
This small sample datatype source code demonstrates, how to completely
write an Amiga OS 3 datatype (V40/V43) without any assembler stubs
or compiler/linker tricks in PURE C source code (currently SAS/C-based:
see Aminet:dev/c/CLib37x.LHA on how to adjust for some other compilers).
You may e.g. use this example source code to write more portable
Amiga OS 3 datatypes to allow easier porting of these
to other Amiga OS-derived operating systems, or the native
OS of an upcoming PowerPC Amiga.
Translate your 68k-assembler datatype startup-codes smartly
to C by simply using this source-code as an advice how to do it.
As a common case, a datatype of class picture, supporting
PNM-PGM (P5) and PNM-PPM (P6) has been used as an example.
With picture.datatype V40-42 only PGM is supported,
and with picture.datatype V43 reading of PPM is offered as well,
while encountering an PGM file under V43 causes a fallback to V40
routines (could have been done differently, but was not necessary
here just for demonstration).
For testing this datatype, simply use a tool from the NetPBM package
(or maybe for example a tool supporting superview.library) and save
a graphics in the binary PGM or PPM format (P5/P6 of the PNM series).
Then install this datatype and try loading the file via MultiView.
Should work fine.
---
Feel free to use this source for own projects.
It is allowed to be spread and distributed anywhere, as far
as my consent is concerned.
Amiga Technologies, or the current owner of the technologie,
is allowed to always put this source on their newest
Developer CD-ROM.
Thanks and credits will always be appreciated - for example,
you MAY, but NEED NOT:
give me credits in your program's docs, send me keyfiles for
your programs using the library, and so on.
But that's simply voluntarily.
This work was only roughly inspired by David Junod's original
example source codes for datatypes.
** General PerSuaSiVe SoftWorX WWW Support Site is http://wdo.de/ark/
** - actually redirected to http://home.t-online.de/home/Andreas_Kleinert/
_________________________________________________________
| You may reach me the following way. |
| Send bug-reports, money or whatever to: |
|---------------------------------------------------------|
| * SuperView Development & Registration * |
| * DRAFU Development & Registration * |
| * Image Engineer Registration Site Europe * |
| |
| |
| PerSuaSiVe SoftWorX |
| |
| Andreas R. Kleinert |
| Sandstrasse 1 |
| D-57072 Siegen |
| Germany, Europe |
| |
| Any snail mail to the old address will still be routed. |
| |
| Phone: +49-271-22869 also FAX + AM |
| |
| Weekdays after 18.00h. |
| |
| When calling via phone you may leave a message, |
| if I'm not available - but don't expect me |
| calling back to USA, Australia, ... since |
| german phone rates are HIGHLY expensive. |
|_________________________________________________________|
EMail:
Please send binaries via ARK@News.wwbnet.de, and keep
them smaller than 16 KB - otherwise ask before.
Please think twice before sending them - my postbox
is not unlimited in size.
* Do not send binaries via Fido or Fido-Gates ! *
- Fido Andreas Kleinert 2:2457/350.18
- Usenet
>>> Andreas_Kleinert@t-online.de (T-Online)
ARK@News.wwbnet.de (Z-Netz)
ARK@superview.ftn.neckar-alb.de (Fido-Gate)
Andreas_Kleinert@gmx.de (GMX)
(note, that mail sent to @gmx.de currently will be
forwarded to @t-online.de - so, as long as it works,
try to address the latter directly)
- If nothing else works, try one of these public
Fido-Usenet gateways:
In Germany:
Andreas_Kleinert@p18.f350.n2457.z2.fido.sub.org
From USA or elsewhere:
Andreas_Kleinert@p18.f350.n2457.z2.fidonet.org
Known Bugs: - some versions of DOpus and all Installer versions
can't fetch the version information from the
library binary due to some bugs in their code.
Newer DOpus versions have this fixed and C:Version
for example did that task always.
See also: Aminet:dev/GetVersion.lha for a fix.
History:
V43.20 (4.9.97): - fixed dispatcher again
(-> Axel Doerfler)
V43.10 (29.9.97): - added note about GetVersion.lha
- rewrote Dispatch() routine completely,
implemented new routines derived
from Roland Mainz' improved sample code
- DTM_WRITE now can be forced to its
old behaviour by specifying the hidden
prefs option "OLD_DTM_WRITE"
(IFF-ILBM then will be written without
any error code given because of
unsupported DTWR_RAW)
- etc.
V43.9 (29.6.97) : - fixed memory bug-fix (argh)
(-> Gunter Nikl)
V43.8 (24.6.97) : - again removed class dispatcher code (refresh bug)
- added "known bugs" section
- LibInit now delocates library base on error
(NULL return)
(-> Gunter Nikl)
V43.7 (14.6.97) : - fixed ftn-email address
- updated class dispatcher
(-> Roland Mainz)
V43.6 (27.3.97) : - did some finetuning
- now can simply be turned into a V40 datatype
by removing a #define (and/or the corresponding
parts of the code)
V43.5 (25.1.97) : - now explicitely checks for DTA_SourceType == DTST_File
- small changes
- updated email information
V43.4 (3.1.97) : - fixed PRI entry in resident part
- slightly changed SCOPTIONS
- fixed some style things (APTR and library casts)
- fixed a bug: bitmap would not have been freed
on temporary-buffer allocation error
- added note about library opening to L_OpenLibs()
V43.3 (30.11.96) : - added SAS/C specific Ctrl-C disabling code
- made some workarounds compiler sensitive
- redone all with SAS/C V6.57
V43.2 (3.11.96) : - there was a FreeBitMap() call missing (oops)
- it's samplePNM.dt, not samplePNG.dt ;-)
V43.1 (25.10.96) : - added picture datatype V43 support
- thus added support for 24 Bit PPM (P6),
since PGM only has 256 grayscales
- thus renamed to samplePNM.datatype
V40.3 (13.9.96) : - fixed more "style" things
V40.2 (5.9.96) : - fixed some "style" things
V40.1 (2.9.96) : - first release
---
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