Who can explain the display architecture?

[David Abrahams <dave@boost-consulting.com>]

I am trying to get a clue as to how this stuff is organized so that I
can fix the problems described below.  Thanks for your attention.

David Abrahams <dave@boost-consulting.com> writes:

> This concerns the one remaining problem with the ClearType patch I'm
> trying to clean up and submit.  I hope I don't seem too insistent, but
> I've been trying to get a hint for about a week.
>
> David Abrahams <dave@boost-consulting.com> writes:
>
>> David Abrahams <dave@boost-consulting.com> writes:
>>
>>> David Abrahams <dave@boost-consulting.com> writes:
>>>
>>>> I am seeing some minor artifacts that I don't know what to do about.
>>>> For example, when I backspace over these parens starting from the end
>>>> of the line, I end up with some small remnants of the background color
>>>> emacs uses to highlight matching parens for me.  When all the close
>>>> parens are gone there's a thin vertical cyan line at the right edge of
>>>> each open paren.  Any clues where to attack that?
>>>>
>>>> ((((()))))
>>>
>>> Even some vague hints would be a big help here.  This is the only
>>> remaining detail as far as I can tell.
>>
>> I have one more piece of information for anyone who can think about
>> this problem for a moment: When I do `C-s x', the first instance of x
>> (or whatever character) that is found gets highlighted in purple and
>> looks right.  The next instance of x on that line gets highlighted in
>> cyan and looks right.  The rest of the instances of x on that line get
>> highlighted in cyan, and the highlighting extends one pixel too far to
>> the left.  On each line thereafter, the first instance of x is
>> highlighted in cyan and looks right, and the rest of the instances on
>> that line are highlighted in cyan and look wrong (i.e. the
>> highlighting extends one pixel too far to the left).
>
> Can someone please give me some hint as to which entry points to
> breakpoint in order to observe these calculations and/or drawing in
> action?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com