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stdvga: fix screen blanking

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In case the display surface uses a shared buffer (i.e. uses vga vram
directly instead of a shadow) go unshare the buffer before clearing it.

This avoids vga memory corruption, which in turn fixes unblanking not
working properly with X11.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2067
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20240605131444.797896-2-kraxel@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
(cherry picked from commit b1cf266c82)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Gerd Hoffmann 2024-06-05 15:14:41 +02:00 committed by Michael Tokarev
parent 6ce9033339
commit c53db9c66d
1 changed files with 7 additions and 0 deletions
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7
hw/display/vga.c
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@ -1746,6 +1746,13 @@ static void vga_draw_blank(VGACommonState *s, int full_update)
if (s->last_scr_width <= 0 || s->last_scr_height <= 0)
return;
if (is_buffer_shared(surface)) {
/* unshare buffer, otherwise the blanking corrupts vga vram */
surface = qemu_create_displaysurface(s->last_scr_width,
s->last_scr_height);
dpy_gfx_replace_surface(s->con, surface);
}
w = s->last_scr_width * surface_bytes_per_pixel(surface);
d = surface_data(surface);
for(i = 0; i < s->last_scr_height; i++) {