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 Readme for:  Datatype » Image » warppngdt.lha


Description: PNG image datatype V45.23
Download: warppngdt.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 160kb
Version: 45.23
Date: 01 Apr 2021
Author: oliver@futaura.co.uk (Oliver Roberts)
Submitter: Samir Hawamdeh
Homepage: http://www.warpdt.co.uk/
Category: datatype/image
Replaces: datatype/image/warppngdt.lha
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 11627
Comments: 1
Snapshots: 0
Videos: 0
Downloads: 87  (Current version)
796  (Accumulated)
Votes: 1 (0/0)  (30 days/7 days)

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Changes since previous OS4Depot release:

 - Relaxed integrity checks to increase performance. Now 15-20%
   faster on 68k, 5-10% faster on OS4, 7% faster on WarpOS and
   5% faster on MorphOS.
 - Allow images with incorrect CMF bytes to be loaded - such
   images should really be fixed with pngfix [BUGID 0002].
 - Fixed faulty parsing of the background colour option.
 - Fixed incorrect default background colour reading on WarpOS.
 - Completely reworked more intelligent detection of features
   available in differing picture.datatype versions and a more
   robust detection of alpha channel support (OS 3.1.4 no longer
   misidentified as alpha aware).
 - Changed prefs loading routine due to dos/ReadArgs() on MorphOS not
   being fully compatible with AmigaOS, which was causing the prefs
   to not always be read properly.


 - Supports both normal and interlaced PNG files

 - Gamma correction options allow the output image to be changed to
   suit your monitor/environment

 - Alpha channel handling can be configured to output RGBA bitmaps, or
   RGB bitmaps either by combining the alpha information internally
   using a configurable background colour or simply stripping it

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

 - 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 libpng 1.6.37 and zlib 1.2.11


WarpPNG is a PNG 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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