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From: Eli Zaretskii <eliz@gnu.org>
To: Po Lu <luangruo@yahoo.com>
Cc: emacs-devel@gnu.org
Subject: Re: master 77c3d41adc: Prevent text decorations from overwriting surrounding areas on X
Date: Mon, 10 Jan 2022 19:47:36 +0200	[thread overview]
Message-ID: <8335lva3ev.fsf@gnu.org> (raw)
In-Reply-To: <87zgo3pzu3.fsf@yahoo.com> (message from Po Lu on Mon, 10 Jan 2022 19:58:12 +0800)

> From: Po Lu <luangruo@yahoo.com>
> Date: Mon, 10 Jan 2022 19:58:12 +0800
> 
> Po Lu via Mailing list for Emacs changes <emacs-diffs@gnu.org> writes:
> 
> >     Prevent text decorations from overwriting surrounding areas on X
> >     
> >     * src/xterm.c (x_draw_underwave): New parameter
> >     `decoration_width'.
> >     (x_draw_glyph_string): Constrain decoration width to current
> >     text area.
> 
> This happens on X because nothing actually clips the decoration to the
> string's area when we draw the decoration.

I'm not sure I understand what clipping did you have in mind.  In
x_draw_underwave, for example, we have this:

  /* Find and set clipping rectangle */

  wave_clip.x = x0;
  wave_clip.y = y0;
  wave_clip.width = width;
  wave_clip.height = wave_height;
  get_glyph_string_clip_rect (s, &string_clip);

  if (!gui_intersect_rectangles (&wave_clip, &string_clip, &final_clip))
    return;

  XSetClipRectangles (display, s->gc, 0, 0, &final_clip, 1, Unsorted);

Isn't this the clipping?  Or what am I missing?

> You can test by running custom-set-faces on default, enabling an
> underline or overline, and typing in a field that is extended to the end
> of the line.

Please show some actual Lisp to try this, so we wouldn't need to guess
whether the problem doesn't exist or we failed to reproduce correctly.



  reply	other threads:[~2022-01-10 17:47 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <164181573002.27254.10999604516337949526@vcs2.savannah.gnu.org>
     [not found] ` <20220110115530.E4B34C0DA1D@vcs2.savannah.gnu.org>
2022-01-10 11:58   ` master 77c3d41adc: Prevent text decorations from overwriting surrounding areas on X Po Lu
2022-01-10 17:47     ` Eli Zaretskii [this message]
2022-01-11  0:37       ` Po Lu
2022-01-11 12:42         ` Eli Zaretskii
2022-01-11 13:18           ` Po Lu
2022-01-11 13:35             ` Eli Zaretskii
2022-01-12  1:56               ` Po Lu
2022-01-12  2:30                 ` Jose Antonio Ortega Ruiz
2022-01-12  3:05                   ` Po Lu
2022-01-12  3:48                     ` Jose Antonio Ortega Ruiz
2022-01-12  3:29                 ` Eli Zaretskii

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