Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!mcsun!ukc!acorn!john
From: john@acorn.co.uk (John Bowler)
Newsgroups: comp.windows.x
Subject: A question about ImageText
Keywords: ImageText Protocol
Message-ID: <1341@acorn.co.uk>
Date: 5 Jan 90 15:10:22 GMT
Reply-To: jbowler@acorn.co.uk (John Bowler)
Organization: Acorn Computers Ltd, Cambridge, UK
Lines: 17


The ImageText8 and ImageText16 protocol requests are defined to fill in
a background rectangle of width ``overallWidth''; where overallWidth
is the sum of the character width metrics.  So what happens if this
quantity is negative?  (Quite likely with a RightToLeft font).

The sensible interpretation is to fill in a rectangle of width
overall-width with an upper *right* corner at (x, y-fontAscent).  This
achieves what the application program probably expects with a
RightToLeft font (ie that the background of each character gets set, so
long as the character origins are at the right hand side of the
character).  If this interpretation is correct, is the pixel
(x,y-fontAscent) filled in?  If it is this means that the upper left
corner of the rectangle is at (x-overallWidth+1,y-fontAscent) (which
therefore disagrees with the protocol specification).

John Bowler (jbowler@acorn.co.uk)