[PATCH] ephyr: Add -resizeable option

[Daniel Martin]

From: Daniel Martin <daniel.martin at secunet.com>

With this option passed, ephyr windows can be resized like normal
windows on the fly, without the need of an explicit parent window.

Signed-off-by: Daniel Martin <daniel.martin at secunet.com>
---
 hw/kdrive/ephyr/ephyr.c     |    1 +
 hw/kdrive/ephyr/ephyrinit.c |    6 ++++++
 hw/kdrive/ephyr/hostx.c     |   34 ++++++++++++++++++++++------------
 3 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/hw/kdrive/ephyr/ephyr.c b/hw/kdrive/ephyr/ephyr.c
index e6520d0..f32e432 100644
--- a/hw/kdrive/ephyr/ephyr.c
+++ b/hw/kdrive/ephyr/ephyr.c
@@ -56,6 +56,7 @@ typedef struct _EphyrInputPrivate {
 } EphyrKbdPrivate, EphyrPointerPrivate;
 
 Bool EphyrWantGrayScale = 0;
+Bool EphyrWantResize = 0;
 
 Bool
 ephyrInitialize(KdCardInfo * card, EphyrPriv * priv)
diff --git a/hw/kdrive/ephyr/ephyrinit.c b/hw/kdrive/ephyr/ephyrinit.c
index 5e2eb67..adacac9 100644
--- a/hw/kdrive/ephyr/ephyrinit.c
+++ b/hw/kdrive/ephyr/ephyrinit.c
@@ -31,6 +31,7 @@
 
 extern Window EphyrPreExistingHostWin;
 extern Bool EphyrWantGrayScale;
+extern Bool EphyrWantResize;
 extern Bool kdHasPointer;
 extern Bool kdHasKbd;
 
@@ -116,6 +117,7 @@ ddxUseMsg(void)
     ErrorF("-host-cursor         Re-use exisiting X host server cursor\n");
     ErrorF("-fullscreen          Attempt to run Xephyr fullscreen\n");
     ErrorF("-grayscale           Simulate 8bit grayscale\n");
+    ErrorF("-resizeable          Make Xephyr windows resizeable\n");
     ErrorF
         ("-fakexa              Simulate acceleration using software rendering\n");
     ErrorF("-verbosity <level>   Set log verbosity level\n");
@@ -210,6 +212,10 @@ ddxProcessArgument(int argc, char **argv, int i)
         EphyrWantGrayScale = 1;
         return 1;
     }
+    else if (!strcmp(argv[i], "-resizeable")) {
+        EphyrWantResize = 1;
+        return 1;
+    }
     else if (!strcmp(argv[i], "-fakexa")) {
         ephyrFuncs.initAccel = ephyrDrawInit;
         ephyrFuncs.enableAccel = ephyrDrawEnable;
diff --git a/hw/kdrive/ephyr/hostx.c b/hw/kdrive/ephyr/hostx.c
index 157ac36..54cd2af 100644
--- a/hw/kdrive/ephyr/hostx.c
+++ b/hw/kdrive/ephyr/hostx.c
@@ -117,6 +117,8 @@ extern EphyrKeySyms ephyrKeySyms;
 
 extern int monitorResolution;
 
+extern Bool EphyrWantResize;
+
 char *ephyrResName = NULL;
 int ephyrResNameFromCmd = 0;
 char *ephyrTitle = NULL;
@@ -697,7 +699,7 @@ hostx_screen_init(EphyrScreenInfo screen,
     XResizeWindow(HostX.dpy, host_screen->win, width, height);
 
     /* Ask the WM to keep our size static */
-    if (host_screen->win_pre_existing == None) {
+    if (host_screen->win_pre_existing == None && !EphyrWantResize) {
         size_hints = XAllocSizeHints();
         size_hints->max_width = size_hints->min_width = width;
         size_hints->max_height = size_hints->min_height = height;
@@ -1011,19 +1013,27 @@ hostx_get_event(EphyrHostXEvent * ev)
 
         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;
+            struct EphyrHostScreen *host_screen;
+
+            /* event compression as for Expose events, cause
+             * we don't want to resize the framebuffer for
+             * every single change */
+            while (XCheckTypedWindowEvent(HostX.dpy, xev.xconfigure.window,
+                                          ConfigureNotify, &xev));
+            host_screen = host_screen_from_window(xev.xconfigure.window);
+
+            if (!host_screen ||
+                (host_screen->win_pre_existing == None && !EphyrWantResize)) {
+                return 0;
             }
 
-            return 0;
+            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;
         }
         default:
             break;
-- 
1.7.9.5