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From: turk@Apple.COM (Ken "Turk" Turkowski)
Newsgroups: comp.sys.mac,comp.graphics
Subject: Re: PICT file format
Keywords: PICT
Message-ID: <1609@internal.Apple.COM>
Date: 1 May 89 06:55:17 GMT
References: <404@coriander.UUCP>
Organization: Advanced Technology Graphics, Apple Computer, Cupertino, CA, USA
Lines: 29

In article <404@coriander.UUCP> colm@ukfca1 (Colm Gavin) writes:
>We have some colour
>images (in our own in-house 8-bit format) which we would like to transfer to a
>PICT type file on the Mac.
>
>The problem we face is that Mac files seem to have a 128 byte header containing
>things such as the filename. In order to construct a file to be transfered to
>the Mac we need to know what to put in there. Leaving them blank doesn't seem
>to be very successful! We also need to know how to store the PICT resource,
>what format it is and how it is stored in the rest of the file?

Actually, PICT files contain a 512 byte header, which can contain just
about anything, such as image description, copyright, etc.  The rest of
the file is a Picture (aka PICT) and is described in Inside Macintosh
volume 5.

The easiest way to generate the rest of the file is to put all of the
data into a PixMap, then call OpenPicture(), CopyBits(), etc.

Alternatively, you can try to do the same yourself.  Normally, images
are compressed by Quickdraw, but there seems to be both a BitsRect
(rectangle clipped copybits) opcode as well as a PackBitsRect
(rectangle clipped copybits, packed with Copybits) opcode (pp. V-96 -
V-105).  Try the BitsRect opcode and see what happens.
-- 
Ken Turkowski @ Apple Computer, Inc., Cupertino, CA
Internet: turk@apple.com
Applelink: TURKOWSKI1
UUCP: sun!apple!turk