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Introduction
This is yet another datatype for IFF ILBM pictures. My primary
motivatior for this datatype is that I ran into some issues
loading a number of IFF pictures by my favorite datatypes
based viewer and decided to find a solution for these pictures.
This ILBM datatype supports 1-8 bitplanes including EHB and HAM
in V42 (non RTG) mode. In presence of RTG and/or picture.datatype
V43 or later, 24 Bit images are supported as well. In addition,
planar color mapped data and HAM images are loaded into FastRAM
and internally promoted to chunky representation with active RTG
in order to conserve ChipRAM. Some routines are implemented in
Assembler to provide a good loading speed.
This datatype also handles some of the known issues with ILBM
images generated by certain software like Adobe Photoshop.
In addition to regular ILBM images, this datatype also provides
support for dynamic palettes which are generated by tools like
HAMLab or HAM_convert into PCHG or SHAM chunks.
Installation
At most two files need to be copied for installation: the
datatypes descriptor (ILBM) and the datatype class
(ilbm.datatype). You might want move the existing files to
a safekeeping place (e.g. SYS:Storage/Datatypes/). A reboot
is usually required to enable the new datatype.
From CLI:
Copy Classes/Datatypes/ilbm.datatype Sys:Classes/Datatypes/
Copy Devs/Datatypes/ILBM Devs:Datatypes/
From WB:
Drag the ILBM icon from Devs/Datatypes of this distribution
to SYS:Devs/Datatypes and drag Classes/Datatypes/ilbm.datatype
to SYS:Classes/Datatypes.
Troubleshooting
Malformed IFF ILBM files
Some slightly malformed IFF ILBM files are known that they
can be loaded in popular imaging programs but sometimes fail
to be recognised by datatypes. In such cases, stringent checks
in Datatypes.library and IFFParse.library alongside the
requirement to actually rely on these two libraries prevent
the invocation of ilbm.datatype.
This package contains a commandline tool called "fixiff"
which is able to fix some commonly encountered problems with
IFF ILBM files. It takes two arguments. The first argument
is the input file and the second argument is the resulting
copy.
Example: fixiff Workbench:broken_iff.iff ram:fixed_iff.iff
The fixiff tool will correct incorrect IFF FORM header sizes,
convert out-of-spec run-length encoding to valid encoding,
trim extra data and fill up incomplete BODY data with zeros.
The latest fixiff got two additional switches:
NOMASK will omit the mask in the output
ADDGRAB converts a masked picture into a brush.
CPU compatibility
The datatype is an all-in-one binary for any 68k Amiga. Some
68020+ optimizations are enabled at runtime, if applicable.
History
47.6 - dynamic HiRes and dynamic HAM support (PCHG,SHAM) by
promoting such images to 24 bit (V43 picture.datatype)
47.5 - Mask support in 24 Bit mode
- Transparency masks will only be handed to picture.datatype
for brush type IFFs (i.e. some pictures contain a mask plane
that is actually a drawing stencil)
47.4 - Replaced Datatypes descriptor (DEVS:Datatypes/ILBM) by
a different variant that relies on pattern matching
instead of detection code. This fixes issues with
clipboard operations. Datatypes.library 45.4 now likes
the new descriptor, too.
47.3 - first Aminet release
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Contents of util/dtype/ILBMdt.lha
PERMISSION UID GID PACKED SIZE RATIO METHOD CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[unknown] 261 516 50.6% -lh5- 551a Jul 31 10:22 ILBMdt/Classes/Datatypes.info
[unknown] 7834 15560 50.3% -lh5- 5b74 Dec 22 08:11 ILBMdt/Classes/Datatypes/ilbm.datatype
[unknown] 261 516 50.6% -lh5- 551a Jul 31 10:22 ILBMdt/Devs/Datatypes.info
[unknown] 141 168 83.9% -lh5- ddf3 Dec 22 08:09 ILBMdt/Devs/Datatypes/ILBM
[unknown] 281 467 60.2% -lh5- c6c4 Jul 31 10:22 ILBMdt/Devs/Datatypes/ILBM.info
[unknown] 1769 7488 23.6% -lh5- 2eac Dec 20 15:38 ILBMdt/Source/pchg.c
[unknown] 921 2373 38.8% -lh5- 8cad Dec 21 10:49 ILBMdt/Source/pchg.h
[unknown] 659 1230 53.6% -lh5- 9c67 Dec 22 08:03 ILBMdt/Source/releasenotes
[unknown] 506 939 53.9% -lh5- dc96 Jul 31 10:22 ILBMdt/Source/rtgtest.c
[unknown] 182 276 65.9% -lh5- 982f Jul 31 10:22 ILBMdt/Source/rtgtest.h
[unknown] 266 459 58.0% -lh5- bfbb Jul 31 10:22 ILBMdt/Source/unpackrow_asm.h
[unknown] 1343 4322 31.1% -lh5- ca27 Jul 31 10:22 ILBMdt/Source/unpackrow_asm.s
[unknown] 836 1810 46.2% -lh5- c73b Jul 31 10:22 ILBMdt/Source/unpackrow_c.c
[unknown] 207 385 53.8% -lh5- 0925 Jul 31 10:22 ILBMdt/Source/unpackrow_c.h
[unknown] 1049 2059 50.9% -lh5- 2cde Jul 31 10:22 ILBMdt/Source/dthook.asm
[unknown] 7234 21235 34.1% -lh5- 788f Dec 22 08:05 ILBMdt/Source/fixiff.c
[unknown] 1391 3867 36.0% -lh5- 86ef Sep 7 13:11 ILBMdt/Source/fixiff.h
[unknown] 613 1759 34.8% -lh5- ca1b Dec 19 20:09 ILBMdt/Source/ham2rgb24.c
[unknown] 213 369 57.7% -lh5- 3273 Dec 19 20:05 ILBMdt/Source/ham2rgb24.h
[unknown] 122 215 56.7% -lh5- 49a4 Dec 22 08:09 ILBMdt/Source/ilbm.datatype_rev.h
[unknown] 135 261 51.7% -lh5- 22fa Dec 22 08:09 ILBMdt/Source/ilbm.datatype_rev.i
[unknown] 2 2 100.0% -lh0- a797 Dec 22 08:09 ILBMdt/Source/ilbm.datatype_rev.rev
[unknown] 10871 44453 24.5% -lh5- c622 Dec 22 08:07 ILBMdt/Source/loadimage.c
[unknown] 528 1067 49.5% -lh5- 8916 Dec 20 09:20 ILBMdt/Source/loadimage.h
[unknown] 294 653 45.0% -lh5- 1756 Jul 31 10:22 ILBMdt/Source/p2c_asm.h
[unknown] 4531 25828 17.5% -lh5- 23fe Jul 31 10:22 ILBMdt/Source/p2c_asm.s
[unknown] 748 3729 20.1% -lh5- a174 Jul 31 10:22 ILBMdt/Source/p2c_c.c
[unknown] 187 308 60.7% -lh5- 3a6c Jul 31 10:22 ILBMdt/Source/p2c_c.h
[unknown] 3664 6476 56.6% -lh5- 8155 Dec 22 08:11 ILBMdt/C/fixiff
[unknown] 1784 3658 48.8% -lh5- f9d2 Dec 22 08:30 ILBMdt/ILBMdt.readme
[unknown] 1644 5100 32.2% -lh5- 2698 Jul 31 10:22 ILBMdt/Source/classbase.c
[unknown] 689 2528 27.3% -lh5- ab56 Jul 31 10:22 ILBMdt/Source/classbase.h
[unknown] 724 1368 52.9% -lh5- 5e6b Jul 31 10:22 ILBMdt/Source/classheader.c
[unknown] 796 1843 43.2% -lh5- eee3 Jul 31 10:22 ILBMdt/Source/classinit.c
[unknown] 667 1551 43.0% -lh5- 4c04 Jul 31 10:22 ILBMdt/Source/compiler.h
[unknown] 246 428 57.5% -lh5- caaf Aug 29 12:45 ILBMdt/Source/debug.h
[unknown] 789 1786 44.2% -lh5- 7acf Jul 31 10:22 ILBMdt/Source/dispatch.c
[unknown] 119 174 68.4% -lh5- 3a64 Jul 31 10:22 ILBMdt/Source/dispatch.h
[unknown] 623 1337 46.6% -lh5- 4fbe Nov 28 15:32 ILBMdt/Source/dtdesc.asm
[unknown] 486 1022 47.6% -lh5- 7fc2 Jul 31 10:22 ILBMdt/Source/dtdesc_binary.asm
[unknown] 247 402 61.4% -lh5- 51ae Dec 21 10:44 ILBMdt/Source/FastDecomp.h
[unknown] 930 2426 38.3% -lh5- 8b1b Dec 22 07:59 ILBMdt/Source/FastDecomp.s
[unknown] 775 1552 49.9% -lh5- 93fc Dec 22 08:11 ILBMdt/Source/Makefile
[unknown] 259 516 50.2% -lh5- 2f1b Jul 31 10:22 ILBMdt.info
[unknown] 256 516 49.6% -lh5- 05b0 Jul 31 10:22 ILBMdt/Classes.info
[unknown] 259 516 50.2% -lh5- 85c7 Jul 31 10:22 ILBMdt/Devs.info
[unknown] 272 514 52.9% -lh5- 84ea Jul 31 10:22 ILBMdt/ILBMdt.readme.info
---------- ----------- ------- ------- ------ ---------- ------------ ----------
Total 47 files 58614 176027 33.3% Dec 23 04:00
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Müller and the Aminet team.
Aminet contact address: <aminet aminet net> |
