OS4 DepotLogo by Alessandro Bacchia 
(anonymous IP:,1663) 

   Bug tracker
   Locale browser


   o Audio (332)
   o Datatype (50)
   o Demo (188)
   o Development (562)
   o Document (21)
   o Driver (94)
   o Emulation (143)
   o Game (914)
   o Graphics (479)
   o Library (105)
   o Network (218)
   o Office (60)
   o Utility (858)
   o Video (65)

Total files: 4089

Full index file
Recent index file



Support the site

 Readme for:  Datatype » Image » warpjpegdt.lha


Description: JFIF-JPEG datatype V45.14
Download: warpjpegdt.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 330kb
Version: 45.14
Date: 29 Apr 2020
Author: oliver@futaura.co.uk (Oliver Roberts)
Submitter: uploader
Homepage: http://www.warpdt.co.uk/
Category: datatype/image
Replaces: datatype/image/warpjpegdt.lha
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 11259
Comments: 0
Snapshots: 0
Videos: 0
Downloads: 124  (Current version)
655  (Accumulated)
Votes: 1 (0/0)  (30 days/7 days)

Show comments Show snapshots Show videos Show content Show crashlogs Replace file 
Changes since previous Aminet release:

 - Further 10% speed increase when using AltiVec (OS4 and MorphOS).
 - 5-10% faster on 68k and MorphOS, and 2% faster on WarpOS.
 - Merged in changes from IJG jpeglib v9d.
 - Minor optimizations and improvements.
 - MorphOS and WarpOS versions recompiled with VBCC 0.9g.
 - OS4 version and MorphOS AltiVec code recompiled with GCC 8.1.0.
 - All benchmarks recomputed after the repair of my A1200, with
   SCSI2SD replacing my SCSI HDD and disabling all debug tools.
 - Updated Spanish installer.


 - 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.

Copyright © 2004-2021 by Björn Hagström All Rights Reserved