artist: Allow to turn cursor on or off

Bit 0x80 in the cursor_cntrl register specifies if the cursor
should be visible. Prevent rendering the cursor if it's invisible.

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

diff --git a/hw/display/artist.c b/hw/display/artist.c
index 780cb15..b8930b7 100644 (file)
--- a/hw/display/artist.c
+++ b/hw/display/artist.c
@@ -353,10 +353,20 @@ static void artist_get_cursor_pos(ARTISTState *s, int *x, int *y)
     }
 }
 
+static inline bool cursor_visible(ARTISTState *s)
+{
+    /* cursor is visible if bit 0x80 is set in cursor_cntrl */
+    return s->cursor_cntrl & 0x80;
+}
+
 static void artist_invalidate_cursor(ARTISTState *s)
 {
     int x, y;
 
+    if (!cursor_visible(s)) {
+        return;
+    }
+
     artist_get_cursor_pos(s, &x, &y);
     artist_invalidate_lines(&s->vram_buffer[ARTIST_BUFFER_AP],
                             y, s->cursor_height);
@@ -1218,6 +1228,10 @@ static void artist_draw_cursor(ARTISTState *s)
     struct vram_buffer *cursor0, *cursor1 , *buf;
     int cx, cy, cursor_pos_x, cursor_pos_y;
 
+    if (!cursor_visible(s)) {
+        return;
+    }
+
     cursor0 = &s->vram_buffer[ARTIST_BUFFER_CURSOR1];
     cursor1 = &s->vram_buffer[ARTIST_BUFFER_CURSOR2];
     buf = &s->vram_buffer[ARTIST_BUFFER_AP];