[Qemu-devel] [PULL 11/12] vl: drop display_type variable

[Gerd Hoffmann <kraxel@redhat.com>]

Switch over all leftover users to qapi DisplayType.
Then delete the unused display_type variable.

Add 'default' DisplayType, which isn't an actual display type but
a placeholder for "user didn't specify a display".  It will be replaced
by the DisplayType actually used, which in turn depends on the
DisplayTypes availabel in the particular build.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20180202111022.19269-13-kraxel@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 vl.c         | 54 ++++++++++++++----------------------------------------
 qapi/ui.json |  5 +++--
 2 files changed, 17 insertions(+), 42 deletions(-)

diff --git a/vl.c b/vl.c
index 11dc98eba2..9e7235df6d 100644
--- a/vl.c
+++ b/vl.c
@@ -2080,24 +2080,12 @@ static void select_vgahw(const char *p)
     }
 }
 
-typedef enum LegacyDisplayType {
-    DT_DEFAULT,
-    DT_CURSES,
-    DT_SDL,
-    DT_COCOA,
-    DT_GTK,
-    DT_EGL,
-    DT_NONE,
-} LegacyDisplayType;
-
-static LegacyDisplayType select_display(const char *p)
+static void parse_display(const char *p)
 {
     const char *opts;
-    LegacyDisplayType display = DT_DEFAULT;
 
     if (strstart(p, "sdl", &opts)) {
 #ifdef CONFIG_SDL
-        display = DT_SDL;
         dpy.type = DISPLAY_TYPE_SDL;
         while (*opts) {
             const char *nextopt;
@@ -2172,7 +2160,6 @@ static LegacyDisplayType select_display(const char *p)
     } else if (strstart(p, "egl-headless", &opts)) {
 #ifdef CONFIG_OPENGL_DMABUF
         display_opengl = 1;
-        display = DT_EGL;
         dpy.type = DISPLAY_TYPE_EGL_HEADLESS;
 #else
         error_report("egl support is disabled");
@@ -2180,7 +2167,6 @@ static LegacyDisplayType select_display(const char *p)
 #endif
     } else if (strstart(p, "curses", &opts)) {
 #ifdef CONFIG_CURSES
-        display = DT_CURSES;
         dpy.type = DISPLAY_TYPE_CURSES;
 #else
         error_report("curses support is disabled");
@@ -2188,7 +2174,6 @@ static LegacyDisplayType select_display(const char *p)
 #endif
     } else if (strstart(p, "gtk", &opts)) {
 #ifdef CONFIG_GTK
-        display = DT_GTK;
         dpy.type = DISPLAY_TYPE_GTK;
         while (*opts) {
             const char *nextopt;
@@ -2225,14 +2210,11 @@ static LegacyDisplayType select_display(const char *p)
         exit(1);
 #endif
     } else if (strstart(p, "none", &opts)) {
-        display = DT_NONE;
         dpy.type = DISPLAY_TYPE_NONE;
     } else {
         error_report("unknown display type");
         exit(1);
     }
-
-    return display;
 }
 
 static int balloon_parse(const char *arg)
@@ -3056,7 +3038,6 @@ int main(int argc, char **argv, char **envp)
     const char *incoming = NULL;
     bool userconfig = true;
     bool nographic = false;
-    LegacyDisplayType display_type = DT_DEFAULT;
     int display_remote = 0;
     const char *log_mask = NULL;
     const char *log_file = NULL;
@@ -3250,18 +3231,16 @@ int main(int argc, char **argv, char **envp)
                 }
                 break;
             case QEMU_OPTION_display:
-                display_type = select_display(optarg);
+                parse_display(optarg);
                 break;
             case QEMU_OPTION_nographic:
                 olist = qemu_find_opts("machine");
                 qemu_opts_parse_noisily(olist, "graphics=off", false);
                 nographic = true;
-                display_type = DT_NONE;
                 dpy.type = DISPLAY_TYPE_NONE;
                 break;
             case QEMU_OPTION_curses:
 #ifdef CONFIG_CURSES
-                display_type = DT_CURSES;
                 dpy.type = DISPLAY_TYPE_CURSES;
 #else
                 error_report("curses support is disabled");
@@ -3665,7 +3644,6 @@ int main(int argc, char **argv, char **envp)
                 break;
             case QEMU_OPTION_sdl:
 #ifdef CONFIG_SDL
-                display_type = DT_SDL;
                 dpy.type = DISPLAY_TYPE_SDL;
                 break;
 #else
@@ -4281,7 +4259,7 @@ int main(int argc, char **argv, char **envp)
             exit(1);
         }
 #ifdef CONFIG_CURSES
-        if (display_type == DT_CURSES) {
+        if (dpy.type == DISPLAY_TYPE_CURSES) {
             error_report("curses display cannot be used with -daemonize");
             exit(1);
         }
@@ -4327,39 +4305,35 @@ int main(int argc, char **argv, char **envp)
         display_remote++;
     }
 #endif
-    if (display_type == DT_DEFAULT && !display_remote) {
+    if (dpy.type == DISPLAY_TYPE_DEFAULT && !display_remote) {
 #if defined(CONFIG_GTK)
-        display_type = DT_GTK;
         dpy.type = DISPLAY_TYPE_GTK;
 #elif defined(CONFIG_SDL)
-        display_type = DT_SDL;
         dpy.type = DISPLAY_TYPE_SDL;
 #elif defined(CONFIG_COCOA)
-        display_type = DT_COCOA;
         dpy.type = DISPLAY_TYPE_COCOA;
 #elif defined(CONFIG_VNC)
         vnc_parse("localhost:0,to=99,id=default", &error_abort);
 #else
-        display_type = DT_NONE;
         dpy.type = DISPLAY_TYPE_NONE;
 #endif
     }
 
-    if ((no_frame || alt_grab || ctrl_grab) && display_type != DT_SDL) {
+    if ((no_frame || alt_grab || ctrl_grab) && dpy.type != DISPLAY_TYPE_SDL) {
         error_report("-no-frame, -alt-grab and -ctrl-grab are only valid "
                      "for SDL, ignoring option");
     }
     if (dpy.has_window_close &&
-        (display_type != DT_GTK && display_type != DT_SDL)) {
+        (dpy.type != DISPLAY_TYPE_GTK && dpy.type != DISPLAY_TYPE_SDL)) {
         error_report("-no-quit is only valid for GTK and SDL, "
                      "ignoring option");
     }
 
-    if (display_type == DT_GTK) {
+    if (dpy.type == DISPLAY_TYPE_GTK) {
         early_gtk_display_init(&dpy);
     }
 
-    if (display_type == DT_SDL) {
+    if (dpy.type == DISPLAY_TYPE_SDL) {
         sdl_display_early_init(&dpy);
     }
 
@@ -4690,17 +4664,17 @@ int main(int argc, char **argv, char **envp)
     ds = init_displaystate();
 
     /* init local displays */
-    switch (display_type) {
-    case DT_CURSES:
+    switch (dpy.type) {
+    case DISPLAY_TYPE_CURSES:
         curses_display_init(ds, &dpy);
         break;
-    case DT_SDL:
+    case DISPLAY_TYPE_SDL:
         sdl_display_init(ds, &dpy);
         break;
-    case DT_COCOA:
+    case DISPLAY_TYPE_COCOA:
         cocoa_display_init(ds, &dpy);
         break;
-    case DT_GTK:
+    case DISPLAY_TYPE_GTK:
         gtk_display_init(ds, &dpy);
         break;
     default:
@@ -4721,7 +4695,7 @@ int main(int argc, char **argv, char **envp)
     }
 
 #ifdef CONFIG_OPENGL_DMABUF
-    if (display_type == DT_EGL) {
+    if (dpy.type == DISPLAY_TYPE_EGL_HEADLESS) {
         egl_headless_init(&dpy);
     }
 #endif
diff --git a/qapi/ui.json b/qapi/ui.json
index 398baa9698..3e82f25ac5 100644
--- a/qapi/ui.json
+++ b/qapi/ui.json
@@ -1020,7 +1020,7 @@
 #
 ##
 { 'enum'    : 'DisplayType',
-  'data'    : [ 'none', 'gtk', 'sdl',
+  'data'    : [ 'default', 'none', 'gtk', 'sdl',
                 'egl-headless', 'curses', 'cocoa' ] }
 
 ##
@@ -1042,7 +1042,8 @@
                 '*window-close'  : 'bool',
                 '*gl'            : 'bool' },
   'discriminator' : 'type',
-  'data'    : { 'none'           : 'DisplayNoOpts',
+  'data'    : { 'default'        : 'DisplayNoOpts',
+                'none'           : 'DisplayNoOpts',
                 'gtk'            : 'DisplayGTK',
                 'sdl'            : 'DisplayNoOpts',
                 'egl-headless'   : 'DisplayNoOpts',
-- 
2.9.3