Short:        QOI datatype + converter, fast, 68000+
Author:       Tobias Karlsson
Uploader:     tobias karlsson piratkopia se (Tobias Karlsson)
Type:         util/dtype
Version:      0.1b1
Architecture: m68k-amigaos >= 3.0.0

================================================================
  QOI - QOI pictures for every Amiga: a datatype and a converter
================================================================


WHAT IT IS

  QOI ("Quite OK Image", qoiformat.org) is a lossless picture
  format with full colour and transparency that decodes many
  times faster than PNG. This package teaches the Amiga to use it:

  qoi.datatype  shows QOI pictures in every program that opens
                pictures through datatypes: MultiView, a double-
                click on Workbench, file managers, paint programs

  ToQOI         turns pictures into QOI files: anything the Amiga
                has a picture datatype for (PNG, JPEG, GIF, BMP,
                WebP, ILBM...)

  Both are one build for every Amiga, from a 68000 up, with
  OS 3.0 or later.


FEATURES

  - Full colour with transparency on OS 3.5, 3.9 and 3.2; on 3.2
    the pixels go straight into picture.datatype's own buffer
  - 256 colours on OS 3.0 and 3.1, whose picture.datatype takes no
    full colour: a picture with 256 colours or fewer keeps exactly
    its own, a bigger one gets the best 256 with dithering

  - Fast: a decoder written for the 68k, with a hand-written loop
    for the 68020 and later chosen at run time. On the real A1200
    (Emu68) photos open 2.4-3.6x faster than with the older QOI
    datatype on Aminet, and 3.5-9x faster than the same pictures as
    PNG with OS 3.2's own png.datatype

  - ToQOI keeps PNG transparency and the transparent colour of GIF
    and ILBM pictures; on OS 3.0/3.1 it reads HAM and Extra-
    Halfbrite pictures itself. Patterns, a target drawer, and a
    Workbench start: select pictures, then shift-double-click ToQOI
    (give it a tool icon first)

  - Little memory: neither the datatype nor ToQOI ever holds the
    whole file, and ToQOI never holds the whole picture

  - Safe with broken files: every pixel the same as the reference
    decoder's (qoi.h), also for damaged and cut-short files,
    checked on 450 test pictures and fuzzed. Every byte ToQOI
    writes is the same as the reference encoder's

  - Recognised by its first bytes ("qoif"), whatever the file is
    called


COMPARED WITH THE OLDER QOI DATATYPE (qoi-datatype 0.6, 2022)

  - It needs picture.datatype 43 and does not open QOI pictures on
    OS 3.0 or 3.1; this one shows them there in 256 colours
  - It drops transparency (transparent parts turn black); this one
    keeps it
  - This one opens pictures 2.4-3.6x faster (real A1200)
  - It has no converter; this package has ToQOI


INSTALLATION

  Classes/DataTypes/qoi.datatype  to SYS:Classes/DataTypes/
  Devs/DataTypes/QOI              to DEVS:DataTypes/
  C/ToQOI                         to C:

  Then AddDataTypes REFRESH, or restart the Amiga if another
  qoi.datatype was installed before. The full manual is qoi.doc.


SOURCE

  https://github.com/creep-ltx/AmigaDatatypes  (folder qoi, MIT)


HISTORY

  0.1b1 (17.10.2026) - the first version: qoi.datatype and ToQOI