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[BOOTVID] Improve text scrolling performance for PC-98 (#2936)

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Dmitry Borisov 2020-07-27 23:57:45 +06:00 committed by Stanislav Motylkov
parent 5d40981efa
commit c87be643f8
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GPG key ID: AFE513258CBA9E92
1 changed files with 7 additions and 7 deletions
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14
drivers/base/bootvid/i386/pc98/bootvid.c
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@ -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