[PULL 6/6] hw/display/artist: Fix draw_line() artefacts

[Helge Deller <deller@gmx.de>]

From: Sven Schnelle <svens@stackframe.org>

The draw_line() function left artefacts on the screen because it was using the
x/y variables which were incremented in the loop before. Fix it by using the
unmodified x1/x2 variables instead.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: Helge Deller <deller@gmx.de>
---
 hw/display/artist.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/display/artist.c b/hw/display/artist.c
index 8a9fa482d0..1d877998b9 100644
--- a/hw/display/artist.c
+++ b/hw/display/artist.c
@@ -553,10 +553,11 @@ static void draw_line(ARTISTState *s,
         }
         x++;
     } while (x <= x2 && (max_pix == -1 || --max_pix > 0));
+
     if (c1)
-        artist_invalidate_lines(buf, x, dy+1);
+        artist_invalidate_lines(buf, x1, x2 - x1);
     else
-        artist_invalidate_lines(buf, y, dx+1);
+        artist_invalidate_lines(buf, y1 > y2 ? y2 : y1, x2 - x1);
 }

 static void draw_line_pattern_start(ARTISTState *s)
--
2.34.1