Reads a Lisp Machine bitmap as input. Produces a portable graymap as
This is the file format written by the tv:write-bit-array-file function
on TI Explorer and Symbolics lisp machines.
Multi-plane bitmaps on lisp machines are color; but the lispm image
file format does not include a color map, so we must treat it as a
graymap instead. This is unfortunate.
The Lispm bitmap file format is a bit quirky; Usually the image in the
file has its width rounded up to the next higher multiple of 32, but
not always. If the width is not a multiple of 32, we don't deal with
it properly, but because of the Lispm microcode, such arrays are proba-
bly not image data anyway.
Also, the lispm code for saving bitmaps has a bug, in that if you are
writing a bitmap which is not mod32 across, the file may be up to 7
bits too short! They round down instead of up, and we don't handle
this bug gracefully.
Copyright (C) 1991 by Jamie Zawinski and Jef Poskanzer.
06 March 1990 lispmtopgm(1)
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