提交 c388f408 编写于 作者: T Thomas Huth 提交者: Gerd Hoffmann

ui: Print available display backends with '-display help'

We already print availabled devices with "-device help", or available
backends with "-netdev help" or "-chardev help". Let's provide a way
for the users to query the available display backends, too.
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-id: 20200108144702.29969-1-thuth@redhat.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
上级 3c8a6575
......@@ -442,6 +442,7 @@ void qemu_display_register(QemuDisplay *ui);
bool qemu_display_find_default(DisplayOptions *opts);
void qemu_display_early_init(DisplayOptions *opts);
void qemu_display_init(DisplayState *ds, DisplayOptions *opts);
void qemu_display_help(void);
/* vnc.c */
void vnc_display_init(const char *id, Error **errp);
......
......@@ -1669,7 +1669,8 @@ STEXI
@item -display @var{type}
@findex -display
Select type of display to use. This option is a replacement for the
old style -sdl/-curses/... options. Valid values for @var{type} are
old style -sdl/-curses/... options. Use @code{-display help} to list
the available display types. Valid values for @var{type} are
@table @option
@item sdl
Display video output via SDL (usually in a separate graphics
......
......@@ -2333,6 +2333,21 @@ void qemu_display_init(DisplayState *ds, DisplayOptions *opts)
dpys[opts->type]->init(ds, opts);
}
void qemu_display_help(void)
{
int idx;
printf("Available display backend types:\n");
for (idx = DISPLAY_TYPE_NONE; idx < DISPLAY_TYPE__MAX; idx++) {
if (!dpys[idx]) {
ui_module_load_one(DisplayType_str(idx));
}
if (dpys[idx]) {
printf("%s\n", DisplayType_str(dpys[idx]->type));
}
}
}
void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp)
{
int val;
......
......@@ -1869,6 +1869,11 @@ static void parse_display(const char *p)
{
const char *opts;
if (is_help_option(p)) {
qemu_display_help();
exit(0);
}
if (strstart(p, "sdl", &opts)) {
/*
* sdl DisplayType needs hand-crafted parser instead of
......
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