[src/trunk]: src/sys/dev/wscons properly optimize drawing stretches of blanks...

[macallan <macallan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/93ff5f8965b6
branches:  trunk
changeset: 823574:93ff5f8965b6
user:      macallan <macallan%NetBSD.org@localhost>
date:      Wed Apr 26 21:03:52 2017 +0000

description:
properly optimize drawing stretches of blanks that are interrupted only by
a change in background colour or flags

diffstat:

 sys/dev/wscons/wsdisplay_vcons.c |  11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diffs (42 lines):

diff -r 6042c3598eaf -r 93ff5f8965b6 sys/dev/wscons/wsdisplay_vcons.c
--- a/sys/dev/wscons/wsdisplay_vcons.c  Wed Apr 26 18:20:01 2017 +0000
+++ b/sys/dev/wscons/wsdisplay_vcons.c  Wed Apr 26 21:03:52 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wsdisplay_vcons.c,v 1.35 2015/11/08 16:49:20 christos Exp $ */
+/*     $NetBSD: wsdisplay_vcons.c,v 1.36 2017/04/26 21:03:52 macallan Exp $ */
 
 /*-
  * Copyright (c) 2005, 2006 Michael Lorenz
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wsdisplay_vcons.c,v 1.35 2015/11/08 16:49:20 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wsdisplay_vcons.c,v 1.36 2017/04/26 21:03:52 macallan Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -421,7 +421,7 @@
        int i, j, offset, boffset = 0, start = -1;
 
        mask = 0x00ff00ff;      /* background and flags */
-       cmp = -1;               /* never match anything */
+       cmp = 0xffffffff;       /* never match anything */
        vcons_lock(scr);
        if (SCREEN_IS_VISIBLE(scr) && SCREEN_CAN_DRAW(scr)) {
 
@@ -474,11 +474,12 @@
                                        } else if (acmp != last_a) {
                                                /*
                                                 * different attr, need to
-                                                * flush 
+                                                * flush & restart 
                                                 */
                                                vd->erasecols(ri, i, start,
                                                    j - start, last_a);
-                                               start = -1;
+                                               start = j;
+                                               last_a = acmp;
                                        }
                                } else {
                                        if (start != -1) {