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console: add dummy surface for guests without graphic card

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So users get a notification instead of a crash.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-04-25 09:33:19 +02:00 committed by Anthony Liguori
parent 5209089fcd
commit d3002b0463
1 changed files with 32 additions and 2 deletions
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34
ui/console.c
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@ -1300,6 +1300,28 @@ DisplaySurface *qemu_create_displaysurface_from(int width, int height, int bpp,
return surface;
}
static DisplaySurface *qemu_create_dummy_surface(void)
{
static const char msg[] =
"This VM has no graphic display device.";
DisplaySurface *surface = qemu_create_displaysurface(640, 480);
pixman_color_t bg = color_table_rgb[0][COLOR_BLACK];
pixman_color_t fg = color_table_rgb[0][COLOR_WHITE];
pixman_image_t *glyph;
int len, x, y, i;
len = strlen(msg);
x = (640/FONT_WIDTH - len) / 2;
y = (480/FONT_HEIGHT - 1) / 2;
for (i = 0; i < len; i++) {
glyph = qemu_pixman_glyph_from_vgafont(FONT_HEIGHT, vgafont16, msg[i]);
qemu_pixman_glyph_render(glyph, surface->image, &fg, &bg,
x+i, y, FONT_WIDTH, FONT_HEIGHT);
qemu_pixman_image_unref(glyph);
}
return surface;
}
void qemu_free_displaysurface(DisplaySurface *surface)
{
if (surface == NULL) {
@ -1312,6 +1334,7 @@ void qemu_free_displaysurface(DisplaySurface *surface)
void register_displaychangelistener(DisplayChangeListener *dcl)
{
static DisplaySurface *dummy;
QemuConsole *con;
trace_displaychangelistener_register(dcl, dcl->ops->dpy_name);
@ -1324,8 +1347,15 @@ void register_displaychangelistener(DisplayChangeListener *dcl)
} else {
con = active_console;
}
if (dcl->ops->dpy_gfx_switch && con) {
dcl->ops->dpy_gfx_switch(dcl, con->surface);
if (dcl->ops->dpy_gfx_switch) {
if (con) {
dcl->ops->dpy_gfx_switch(dcl, con->surface);
} else {
if (!dummy) {
dummy = qemu_create_dummy_surface();
}
dcl->ops->dpy_gfx_switch(dcl, dummy);
}
}
}