[reactos] 04/06: [BOOTVID] Improve text scrolling performance for PC-98 (#2936)

[Dmitry Borisov]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=c87be643f844a276f69d7…

commit c87be643f844a276f69d759dd2652b7eff02086d
Author:     Dmitry Borisov <di.sean(a)protonmail.com>
AuthorDate: Mon Jul 27 23:57:45 2020 +0600
Commit:     Stanislav Motylkov <x86corez(a)gmail.com>
CommitDate: Wed Jul 29 19:10:39 2020 +0300

    [BOOTVID] Improve text scrolling performance for PC-98 (#2936)
---
 drivers/base/bootvid/i386/pc98/bootvid.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/base/bootvid/i386/pc98/bootvid.c
b/drivers/base/bootvid/i386/pc98/bootvid.c
index 459c8e07ca4..0563da8a5e0 100644
--- a/drivers/base/bootvid/i386/pc98/bootvid.c
+++ b/drivers/base/bootvid/i386/pc98/bootvid.c
@@ -283,24 +283,24 @@ PreserveRow(
     _In_ ULONG TopDelta,
     _In_ BOOLEAN Restore)
 {
-    PUCHAR OldPosition, NewPosition;
-    ULONG PixelCount = TopDelta * SCREEN_WIDTH;
+    PULONG OldPosition, NewPosition;
+    ULONG PixelCount = TopDelta * (SCREEN_WIDTH / sizeof(ULONG));
 
     if (Restore)
     {
         /* Restore the row by copying back the contents saved off-screen */
-        OldPosition = (PUCHAR)(FrameBuffer + FB_OFFSET(0, SCREEN_HEIGHT));
-        NewPosition = (PUCHAR)(FrameBuffer + FB_OFFSET(0, CurrentTop));
+        OldPosition = (PULONG)(FrameBuffer + FB_OFFSET(0, SCREEN_HEIGHT));
+        NewPosition = (PULONG)(FrameBuffer + FB_OFFSET(0, CurrentTop));
     }
     else
     {
         /* Preserve the row by saving its contents off-screen */
-        OldPosition = (PUCHAR)(FrameBuffer + FB_OFFSET(0, CurrentTop));
-        NewPosition = (PUCHAR)(FrameBuffer + FB_OFFSET(0, SCREEN_HEIGHT));
+        OldPosition = (PULONG)(FrameBuffer + FB_OFFSET(0, CurrentTop));
+        NewPosition = (PULONG)(FrameBuffer + FB_OFFSET(0, SCREEN_HEIGHT));
     }
 
     while (PixelCount--)
-        WRITE_REGISTER_UCHAR(NewPosition++, READ_REGISTER_UCHAR(OldPosition++));
+        WRITE_REGISTER_ULONG(NewPosition++, READ_REGISTER_ULONG(OldPosition++));
 }
 
 VOID