>From 8d685ff821480aabf28973d2f174f47921617c01 Mon Sep 17 00:00:00 2001
From: Remi Thebault <address@hidden>
Date: Sun, 25 Jan 2015 17:09:58 +0100
Subject: [PATCH 4/4 v2] input: sdl2 win32 ui handles altgr key correctly

Linux guest / Windows host had a dead altgr key problem due to
Windows mapping of altgr to ctrl-alt. This commit fixes it by sending
a fake ctrl-up event to the guest when appropriate.
In case of turbo mode, only one fake event is sent.
In a windows guest, altgr key still works as usual.

Signed-off-by: Remi Thebault <address@hidden>
---
 ui/sdl2.c | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/ui/sdl2.c b/ui/sdl2.c
index 1ad74ba..bba8f4f 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -73,6 +73,12 @@ static SDL_Cursor *guest_sprite;
 static int scaling_active;
 static Notifier mouse_mode_notifier;

+#if defined(INPUT_NEEDS_ALTGR_FIX)
+/* win32 alt-gr handling */
+static bool l_ctrl_down = 0;
+static bool r_alt_down = 0;
+#endif
+
 static void sdl_update_caption(struct sdl2_state *scon);

 static struct sdl2_state *get_scon_from_window(uint32_t window_id)
@@ -252,11 +258,37 @@ static void sdl_process_key(struct sdl2_state *scon,
         } else {
             modifiers_state[ev->keysym.scancode] = 1;
         }
-        /* fall though */
-    default:
-        qemu_input_event_send_key_qcode(con, qcode,
-                                        ev->type == SDL_KEYDOWN);
+        break;
+    }
+
+#if defined(INPUT_NEEDS_ALTGR_FIX)
+    /* Windows maps altgr key to l-ctrl + r-alt.
+       For proper handling in the guest, only r-alt is to be sent.
+       This is done by sending a fake "ctrl up" event when appropriate. */
+    switch (ev->keysym.scancode) {
+    case SDL_SCANCODE_LCTRL: /* l-ctrl */
+        if (!l_ctrl_down && r_alt_down) {
+            /* fake ctrl up already sent */
+            return;
+        }
+        l_ctrl_down = (ev->type == SDL_KEYDOWN);
+        break;
+    case SDL_SCANCODE_RALT: /* r-alt */
+        if (l_ctrl_down && !r_alt_down &&
+                ev->type == SDL_KEYDOWN) {
+            /* sending fake "ctrl up" event */
+            qemu_input_event_send_key_qcode(con,
+                    sdl2_scancode_to_qcode[SDL_SCANCODE_LCTRL],
+                    false);
+            l_ctrl_down = false;
+        }
+        r_alt_down = (ev->type == SDL_KEYDOWN);
+        break;
     }
+#endif
+
+    qemu_input_event_send_key_qcode(con, qcode,
+                                    ev->type == SDL_KEYDOWN);
 }

 static void sdl_update_caption(struct sdl2_state *scon)
--
1.8.5.2.msysgit.0