carolyn@cbmvax.cbm.UUCP (Carolyn Scheppner) (06/17/86)
The following is a description of a newly registered IFF FORM "ACBM"
and its ABIT chunk. Amiga screens stored in this form may be loaded
more quickly by AmigaBasic using one xRead() for each bitplane.
(Using xRead() requires a dos.bmap made with NewConvertFD)
If there is any interest, I can post the AmigaBasic programs LoadACBM,
LoadILBM-SaveACBM, and SaveILBM. NewConvertFD and ScreenPrint were in
my previous message.
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IFF FORM / CHUNK DESCRIPTION
============================
Form/Chunk ID: FORM ACBM (Amiga Contiguous BitMap)
Chunk ABIT (Amiga BITplanes)
Date Submitted: 05/29/86
Submitted by: Carolyn Scheppner CBM
FORM
====
FORM ID: ACBM (Amiga Contiguous BitMap)
FORM Description:
FORM ACBM has the same format as FORM ILBM except the normal BODY
chunk (InterLeaved BitMap) is replaced by an ABIT chunk (Amiga BITplanes).
FORM Purpose:
To enable faster loading/saving of screens, especially from Basic,
while retaining the flexibility and portability of IFF format files.
CHUNKS
======
Chunk ID: ABIT (Amiga BITplanes)
Chunk Description:
The ABIT chunk contains contiguous bitplane data. The chunk contains
sequential data for bitplane 0 through bitplane n.
Chunk Purpose:
To enable loading/storing of bitmaps with one DOS Read/Write per
bitplane. Significant speed increases are realized when loading/saving
screens from Basic.
SUPPORTING SOFTWARE
===================
(Public Domain, available soon via Fish PD disk, various networks)
LoadILBM-SaveACBM (AmigaBasic)
Loads and displays an IFF ILBM pic file (Graphicraft, DPaint, Images).
Optionally saves the screen in ACBM format.
LoadACBM (AmigaBasic)
Loads and display an ACBM format pic file.
SaveILBM (AmigaBasic)
Saves a demo screen as an ILBM pic file which can be loaded into
Graphicraft, DPaint, Images.
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Carolyn Scheppner -- CBM >>Amiga Technical Support<<
UUCP ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn
PHONE 215-431-9180
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