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Re: Question about display engine
From: |
Eli Zaretskii |
Subject: |
Re: Question about display engine |
Date: |
Wed, 07 Aug 2019 19:41:25 +0300 |
> Cc: address@hidden
> From: martin rudalics <address@hidden>
> Date: Wed, 7 Aug 2019 18:25:37 +0200
>
> > And, of course, this leaves the more general problem I described in my
> > message: what is the right behavior for extending the face that
> > crosses a newline. (Note that the display engine in general doesn't
> > know whether a face that doesn't end before a newline will or won't
> > continue on the next screen line.)
>
> Recalling your proposal
>
> (defcustom face-extend-to-window-edge t
> "Non-nil means extend face of last character on line to window edge.
Thanks for the reminder.
> Certain face attributes, if present in the face of the last character
> of a line and different from those of the default face, cause the
> empty space following the end of text on the line to be drawn with
> those attributes, to give the empty space appearance similar to that
> of the preceding text. These attributes are those which affect the
> background of a face: `:background', `:stipple', `:box', `:underline',
> `:overline', and `:strike-through'. By default, if the face of a
> line's last character has any of these attributes, and the value is
> different from that of the default face, the empty space following the
> line's text will be drawn in the face of the last character.
This is inaccurate, I think: on GUI frames only :background and :box
are extended all the way, the rest only "infect" the glyph we add for
displaying the newline.
> This variable allows fine-tuning which attributes trigger the face
> extension. The default value of t means any of the mentioned
> attributes will cause face extension. The value of nil means face
> extension is turned off. A value that is a list of attributes will
> extend the face only if any of the attributes from the list are
> present in the last character's face. Note that only attributes from
> the above list are meaningful in list values of this variable.")
>
> in the discussion of Bug#23574.
And I think we need to consider the case of the region using one of
the attributes that are not in the list.
- Question about display engine, Ergus, 2019/08/06
- Re: Question about display engine, Eli Zaretskii, 2019/08/07
- Re: Question about display engine, Ergus, 2019/08/07
- Re: Question about display engine, Eli Zaretskii, 2019/08/07
- Re: Question about display engine, Ergus, 2019/08/07
- Re: Question about display engine, Eli Zaretskii, 2019/08/07
- Re: Question about display engine, martin rudalics, 2019/08/07
- Re: Question about display engine,
Eli Zaretskii <=
- Re: Question about display engine, martin rudalics, 2019/08/08
- Re: Question about display engine, Ergus, 2019/08/08
- Re: Question about display engine, martin rudalics, 2019/08/08
- Re: Question about display engine, Ergus, 2019/08/08
- Re: Question about display engine, martin rudalics, 2019/08/08
- Re: Question about display engine, Eli Zaretskii, 2019/08/08
- Re: Question about display engine, Ergus, 2019/08/08
- Re: Question about display engine, Eli Zaretskii, 2019/08/08
- Re: Question about display engine, Ergus, 2019/08/08
- Re: Question about display engine, Eli Zaretskii, 2019/08/09