GNU bug report logs - #16691
24.3.50; emacs_backtrace.txt

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Message #37 received at 16691 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 16691 <at> debbugs.gnu.org, lekktu <at> gmail.com, drew.adams <at> oracle.com
Subject: Re: bug#16691: 24.3.50; emacs_backtrace.txt
Date: Sun, 09 Feb 2014 19:58:12 +0100

>> I don't understand the glyph_row structure and hopefully never ever have
>> touched it.

But while you're here could you please try to explain the following
issues wrt three members of glyph_row:

- short used[1 + LAST_AREA]: What does "Number of glyphs actually filled
  in areas." mean?  Does this mean that for example the first element is
  zero when the left margin doesn't exist?

- int x, y: Where and how are these set for a particular row (including
  header- and mode-line) and when and how are these eventually consumed?
  This is the greatest mystery for me so far.

- int visible_height: "Partially visible rows may be found at the top
  and bottom of a window."  Is it true that we can draw partially
  visible rows at the top of the window?

Thanks, martin

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