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JPEG-DT35.readme
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1999-11-14
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Short: New Datatype for JPEG Images (46.0)
Uploader: astegema@ix.urz.uni-heidelberg.de (Achim Stegemann)
Author: astegema@ix.urz.uni-heidelberg.de (Achim Stegemann)
Type: util/dtype
Version: 46.0
Requires minimum:
* OS 3.5
Additionally recommended:
* MUI 3.8 for the preferences.
##########################################################
NOTE:
This JPEG datatype is for OS 3.5 only !!
Download util/dtype/JPEG-DT.lha under OS 3.0 or OS 3.1 !!
##########################################################
With the help of the jpeg.datatype, your datatype sytem is able to read JPEG images.
This datatype is freeware and can be used for any purpose !
##### Why another datatype for JPEG images ? #####
Well there are many of them available on the Aminet, but this has two unbeatable
advantages !!
1. It is very short, only about 8 kB !! Why ? Because it does not contain the JPEG
de/encoder in the datatype itself.
The datatype uses the jpeg.library from Paul Huxham for the JPEG de/encoding
from the latest JPEG V6b release, so it is up-to-date.
2. It can write JPEG files when using the DTMW_RAW flag in the DTM_WRITE method !!
Internet: http://www.rzuser.uni-heidelberg.de/~astegema/
Important note about the source code:
*************************************
The source has been written in C++ using Maxon-C++ V3.
You will find several instructions a bit strange as I have converted all C-style OS-structures
to C++ OS-structures.
E.g.
struct Library
{
struct Node lib_Node;
UBYTE lib_Flags;
UBYTE lib_pad;
UWORD lib_NegSize;
UWORD lib_PosSize;
UWORD lib_Version;
UWORD lib_Revision;
APTR lib_IdString;
ULONG lib_Sum;
UWORD lib_OpenCnt;
};
has been converted to
struct Library:Node // !!!!!
{
UBYTE lib_Flags;
UBYTE lib_pad;
UWORD lib_NegSize;
UWORD lib_PosSize;
UWORD lib_Version;
UWORD lib_Revision;
APTR lib_IdString;
ULONG lib_Sum;
UWORD lib_OpenCnt;
};
This simplifies the code as I don't always need to cast variables to fit arguments
in functions.
Additionally C++ allows to leave away the 'struct' keyword !
If you like to recompile the source-code for your compiler, you need to adjust the
source-code to C. But this should be no problem.