[src/trunk]: src/sys/dev/rasops Fix cursor movement for ri_xscale = 1, e.g., ...

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

details:   https://anonhg.NetBSD.org/src/rev/27bca7b9462a
branches:  trunk
changeset: 457816:27bca7b9462a
user:      rin <rin%NetBSD.org@localhost>
date:      Sun Jul 21 16:19:45 2019 +0000

description:
Fix cursor movement for ri_xscale = 1, e.g., fontwidth = 8 and bpp = 1.

diffstat:

 sys/dev/rasops/rasops.c |  34 +++++++++++++++++++++++++++++-----
 1 files changed, 29 insertions(+), 5 deletions(-)

diffs (57 lines):

diff -r db521d9eaf3e -r 27bca7b9462a sys/dev/rasops/rasops.c
--- a/sys/dev/rasops/rasops.c   Sun Jul 21 16:18:08 2019 +0000
+++ b/sys/dev/rasops/rasops.c   Sun Jul 21 16:19:45 2019 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: rasops.c,v 1.79 2018/12/04 09:27:59 mlelstv Exp $     */
+/*      $NetBSD: rasops.c,v 1.80 2019/07/21 16:19:45 rin Exp $ */
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rasops.c,v 1.79 2018/12/04 09:27:59 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rasops.c,v 1.80 2019/07/21 16:19:45 rin Exp $");
 
 #include "opt_rasops.h"
 #include "rasops_glue.h"
@@ -1025,11 +1025,35 @@
                hrp = ri->ri_hwbits + row * ri->ri_yscale + col
                    * ri->ri_xscale;
        height = ri->ri_font->fontheight;
-       slop1 = (4 - ((long)rp & 3)) & 3;
+
+       /*
+        * For ri_xscale = 1:
+        *
+        * Logic below does not work for ri_xscale = 1, e.g.,
+        * fontwidth = 8 and bpp = 1. So we take care of it.
+        */
+       if (ri->ri_xscale == 1) {
+               while (height--) {
+                       uint8_t tmp8 = ~*rp;
+
+                       *rp = tmp8;
+                       rp += ri->ri_stride;
 
-       if (slop1 > ri->ri_xscale)
-               slop1 = ri->ri_xscale;
+                       if (ri->ri_hwbits) {
+                               *hrp = tmp8;
+                               hrp += ri->ri_stride;
+                       }
+               }
+               return;
+       }
 
+       /*
+        * For ri_xscale = 2, 3, 4, ...:
+        *
+        * Note that siop1 <= ri_xscale even for ri_xscale = 2,
+        * since rp % 3 = 0 or 2.
+        */
+       slop1 = (4 - ((uintptr_t)rp & 3)) & 3;
        slop2 = (ri->ri_xscale - slop1) & 3;
        full1 = (ri->ri_xscale - slop1 - slop2) >> 2;