ephyr: Resize screen automatically when parent window is resized

Bugzilla: https://bugs.freedesktop.org/25804
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Vic Lee <llyzs@163.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

hw/kdrive/ephyr/ephyr.c

@@ -558,6 +558,8 @@ ephyrRandRSetConfig(ScreenPtr pScreen,
     if (wasEnabled)
         KdEnableScreen(pScreen);
 
+    RRScreenSizeNotify(pScreen);
+
     return TRUE;
 
  bail4:
@@ -590,6 +592,43 @@ ephyrRandRInit(ScreenPtr pScreen)
     pScrPriv->rrSetConfig = ephyrRandRSetConfig;
     return TRUE;
 }
+
+static Bool
+ephyrResizeScreen (ScreenPtr           pScreen,
+                  int                  newwidth,
+                  int                  newheight)
+{
+    KdScreenPriv(pScreen);
+    KdScreenInfo *screen = pScreenPriv->screen;
+    RRScreenSize size = {0};
+    Bool ret;
+    int t;
+
+    if (screen->randr & (RR_Rotate_90|RR_Rotate_270)) {
+        t = newwidth;
+        newwidth = newheight;
+        newheight = t;
+    }
+
+    if (newwidth == screen->width && newheight == screen->height) {
+        return FALSE;
+    }
+
+    size.width = newwidth;
+    size.height = newheight;
+
+    ret = ephyrRandRSetConfig (pScreen, screen->randr, 0, &size);
+    if (ret) {
+        RROutputPtr output;
+
+        output = RRFirstOutput(pScreen);
+        if (!output)
+            return FALSE;
+        RROutputSetModes(output, NULL, 0, 0);
+    }
+
+    return ret;
+}
 #endif
 
 Bool
@@ -930,6 +969,14 @@ ephyrPoll(void)
             break;
 #endif                          /* XF86DRI */
 
+#ifdef RANDR
+        case EPHYR_EV_CONFIGURE:
+            ephyrResizeScreen(screenInfo.screens[ev.data.configure.screen],
+                              ev.data.configure.width,
+                              ev.data.configure.height);
+            break;
+#endif /* RANDR */
+
         default:
             break;
         }

hw/kdrive/ephyr/hostx.c

@@ -348,7 +348,8 @@ hostx_init(void)
         | PointerMotionMask
         | KeyPressMask
         | KeyReleaseMask
-        | ExposureMask;
+        | ExposureMask
+        | StructureNotifyMask;
 
     EPHYR_DBG("mark");
 
@@ -696,12 +697,14 @@ hostx_screen_init(EphyrScreenInfo screen,
     XResizeWindow(HostX.dpy, host_screen->win, width, height);
 
     /* Ask the WM to keep our size static */
-    size_hints = XAllocSizeHints();
-    size_hints->max_width = size_hints->min_width = width;
-    size_hints->max_height = size_hints->min_height = height;
-    size_hints->flags = PMinSize | PMaxSize;
-    XSetWMNormalHints(HostX.dpy, host_screen->win, size_hints);
-    XFree(size_hints);
+    if (host_screen->win_pre_existing == None) {
+        size_hints = XAllocSizeHints();
+        size_hints->max_width = size_hints->min_width = width;
+        size_hints->max_height = size_hints->min_height = height;
+        size_hints->flags = PMinSize | PMaxSize;
+        XSetWMNormalHints(HostX.dpy, host_screen->win, size_hints);
+        XFree(size_hints);
+    }
 
     XMapWindow(HostX.dpy, host_screen->win);
 
@@ -1004,6 +1007,22 @@ hostx_get_event(EphyrHostXEvent * ev)
             ev->data.key_up.scancode = xev.xkey.keycode;
             return 1;
 
+        case ConfigureNotify:
+        {
+            struct EphyrHostScreen *host_screen =
+                host_screen_from_window(xev.xconfigure.window);
+
+            if (host_screen && host_screen->win_pre_existing != None) {
+                ev->type = EPHYR_EV_CONFIGURE;
+                ev->data.configure.width = xev.xconfigure.width;
+                ev->data.configure.height = xev.xconfigure.height;
+                ev->data.configure.window = xev.xconfigure.window;
+                ev->data.configure.screen = host_screen->mynum;
+                return 1;
+            }
+
+            return 0;
+        }
         default:
             break;
 

hw/kdrive/ephyr/hostx.h

@@ -47,7 +47,8 @@ typedef enum EphyrHostXEventType {
     EPHYR_EV_MOUSE_RELEASE,
     EPHYR_EV_KEY_PRESS,
     EPHYR_EV_KEY_RELEASE,
-    EPHYR_EV_EXPOSE
+    EPHYR_EV_EXPOSE,
+    EPHYR_EV_CONFIGURE,
 } EphyrHostXEventType;
 
 /* I can't believe it's not a KeySymsRec. */
@@ -89,6 +90,13 @@ struct EphyrHostXEvent {
             int window;
         } expose;
 
+        struct configure {
+            int width;
+            int height;
+            int screen;
+            int window;
+        } configure;
+
     } data;
 
     int key_state;