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 Readme for:  Datatype » Image » warpjpegdt.lha


Description: JFIF-JPEG datatype V45.17
Download: warpjpegdt.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 328kb
Version: 45.17
Date: 09 Oct 2022
Author: oliver@futaura.co.uk (Oliver Roberts)
Submitter: Samir Hawamdeh
Homepage: http://www.warpdt.co.uk/
Category: datatype/image
Replaces: datatype/image/warpjpegdt.lha
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 12263
Comments: 0
Snapshots: 0
Videos: 0
Downloads: 73  (Current version)
951  (Accumulated)
Votes: 1 (0/0)  (30 days/7 days)

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Changes since previous OS4Depot release:

 - Merged in changes from IJG jpeglib v9e.
 - Disabled asynchronous i/o when loading images via OS4 vector-port
   filesystems, removing overhead to improve performance (still enabled
   for older filesystems such as FFS2 and SFS).
 - OS4 version recompiled with GCC 11.2.0.
 - MorphOS and WarpOS versions recompiled with VBCC 0.9h.
 - Tweaked version string so that CPU information can be viewed with
   the version command.


 - Supports regular JFIF files, and also many JPEG variant formats such
   as Exif, Adobe, Photoshop, Mavi, Windows, JCCK/CMYK colorspace files
   and other less common formats

 - Supports both normal and progressive JPEG files

 - SmartScale lossless capable JPEG decoder

 - Can optionally downscale large images to fit the screen, during the
   JPEG decoding process, allowing huge oversized images to be loaded
   and displayed much faster.

 - Full true colour (24-bit) and high quality reduced colour (256 colours
   or less) and greyscale output modes, for graphics cards and native Amiga
   displays respectively

 - Highly optimized datatype dispatch engine, and fast JPEG decoder,
   resulting in a very efficient, compact and quick JPEG datatype

 - Asynchronous file i/o and double buffering techniques (WarpOS only),
   which speeds up image decoding
 - Optimized versions for 68020, 030, 040 and 060

 - PowerPC support with native OS4, WarpOS and MorphOS versions

 - AltiVec speed optimizations for OS4 and MorphOS

 - Alter the pen allocation precision when images are remapped to an
   8-bit display

 - Specific support for the AmigaOS picture.datatype v44+, when available

 - The dithering feature of the AmigaOS picture.datatype v44+ can be
   configured to your liking (e.g. disabled for 15/16-bit displays)

 - Based on the Independent JPEG Group's jpeglib 9d/6b and libjpeg-turbo


WarpJPEG is a JFIF/JPEG datatype which utilizes and requires the following:

 - Kickstart 3.0 or higher
 - picture.datatype v43 or higher
   (i.e. either of the ones supplied with AmigaOS 3.5+, P96 or CGraphX)

 68k version

 - 68020 processor or higher (optimized versions included)

 WarpOS version

 - PPC accelerator card + 68040/060
 - WarpUp Release 5.0 or higher

 OS4 version

 - PPC accelerator card / AmigaOne / SAM
 - AmigaOS 4.0 or higher

 MorphOS version

 - PPC accelerator card / Pegasos / Efika
 - MorphOS 1.4 or higher

Note that a graphics card is not necessary.

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