Path: utzoo!yunexus!geac!orcisi!michael
From: michael@orcisi.UUCP (Michael Herman)
Newsgroups: comp.lang.smalltalk
Subject: Re: Blue Book errors?
Message-ID: <1098@orcisi.UUCP>
Date: 9 Jan 88 17:47:46 GMT
Article-I.D.: orcisi.1098
Posted: Sat Jan  9 12:47:46 1988
References: <80500024@uiucdcsp>
Organization: Optical Recording Corporation, Toronto, Ontario
Lines: 21

> Does anyone have a list of Blue Book* errors, typos, etc.?
> * 'Smalltalk-80, The Language and Its Implementation' by Goldberg and Robson

The Blue Book's implementation of Rotation doesn't work properly when
used with the same book's implementation of Bitblt.  A couple of us
from Waterloo "discovered" this a few years ago.  It was checked out
and acknowledged by Robson.

The problem was discovered while trying to rotate small 32x32 or 64x64
bitmaps.  I believe the problem occurred then the source and
destination bitmap were the same bitmap and the width of the rectangle
was the same as the word size of the machine (or something like that).

If anyone has a fix, I would still be interesting in looking at it.

Michael Herman
Optical Recording Corporation
141 John Street, Toronto, Ontario, Canada  M5V 2E4

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