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artist: only render dirty scanlines on the display surface

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The framebuffer_update_display() function returns the dirty scanlines that were
touched since the last display update, however artist_update_display() always calls
dpy_gfx_update() with start and end scanlines of 0 and s->height causing the
entire display surface to be rendered on every update.

Update artist_update_display() so that dpy_gfx_update() only renders the dirty
scanlines on the display surface, bypassing the display surface rendering
completely if framebuffer_update_display() indicates no changes occurred.

This noticeably improves boot performance when the framebuffer is enabled on my
rather modest laptop here, including making the GTK UI usable.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20220504153708.10352-4-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Helge Deller <deller@gmx.de>
Reviewed-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2022-05-04 16:37:08 +01:00
parent ada804eb89
commit 1f11051619
1 changed files with 3 additions and 1 deletions
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4
hw/display/artist.c
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@ -1243,7 +1243,9 @@ static void artist_update_display(void *opaque)
artist_draw_cursor(s);
dpy_gfx_update(s->con, 0, 0, s->width, s->height);
if (first >= 0) {
dpy_gfx_update(s->con, 0, first, s->width, last - first + 1);
}
}
static void artist_invalidate(void *opaque)