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Date:      Thu, 20 Apr 2017 14:06:05 -0400
From:      Jung-uk Kim <jkim@FreeBSD.org>
To:        Ed Maste <emaste@freebsd.org>
Cc:        "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>
Subject:   Re: svn commit: r317171 - head/sys/dev/vt
Message-ID:  <f7db1900-5d12-4b0d-9358-75c5aa8a9c58@FreeBSD.org>
In-Reply-To: <CAPyFy2C4d9LJMME%2BSPd%2BAA1s375eFKOXyNJQYTmT6Edf1%2BCRrA@mail.gmail.com>
References:  <201704192221.v3JMLFPs032866@repo.freebsd.org> <CAPyFy2C4d9LJMME%2BSPd%2BAA1s375eFKOXyNJQYTmT6Edf1%2BCRrA@mail.gmail.com>

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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Ed Maste <emaste@freebsd.org>
Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>,
 "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>,
 "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>
Message-ID: <f7db1900-5d12-4b0d-9358-75c5aa8a9c58@FreeBSD.org>
Subject: Re: svn commit: r317171 - head/sys/dev/vt
References: <201704192221.v3JMLFPs032866@repo.freebsd.org>
 <CAPyFy2C4d9LJMME+SPd+AA1s375eFKOXyNJQYTmT6Edf1+CRrA@mail.gmail.com>
In-Reply-To: <CAPyFy2C4d9LJMME+SPd+AA1s375eFKOXyNJQYTmT6Edf1+CRrA@mail.gmail.com>

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On 04/19/2017 22:22, Ed Maste wrote:
> On 19 April 2017 at 18:21, Jung-uk Kim <jkim@freebsd.org> wrote:
>> Author: jkim
>> Date: Wed Apr 19 22:21:15 2017
>> New Revision: 317171
>> URL: https://svnweb.freebsd.org/changeset/base/317171
>>
>> Log:
>>   Micro-optimize vt_set_border().
>=20
> I expect we'll eventually have vt drivers that have a non-trivial
> vd_drawrect, making the previous implementation preferable. Can you
> comment a bit more on this change?

Maybe but I haven't seen much improvement in the area for many years.
Do you have any reason to believe someone is working on it?

Even if we have such backend, I don't expect much difference in drawing
small area, i.e., redrawing narrow borders.  On top of that, I don't
like "if (vd->vd_driver->vd_drawrect =3D=3D NULL) return (ENOTSUP)" stuff=
=2E

Jung-uk Kim


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