From 7de242e72cbe45b808097e20b7d30d1c71d6dcba Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Wed, 13 May 2015 22:39:20 -0700
Subject: [PATCH] Added SDL_SetWindowsMessageHook() to facilitate full IME
 support on Windows

---
 include/SDL_system.h                  |  6 ++++++
 src/dynapi/SDL_dynapi_overrides.h     |  1 +
 src/dynapi/SDL_dynapi_procs.h         |  1 +
 src/video/SDL_egl.c                   |  0
 src/video/windows/SDL_windowsevents.c | 13 +++++++++++++
 5 files changed, 21 insertions(+)
 mode change 100755 => 100644 src/video/SDL_egl.c

diff --git a/include/SDL_system.h b/include/SDL_system.h
index ee9bb48166700..2bb64c27c4f54 100644
--- a/include/SDL_system.h
+++ b/include/SDL_system.h
@@ -42,6 +42,12 @@ extern "C" {
 
 /* Platform specific functions for Windows */
 #ifdef __WIN32__
+	
+/**
+   \brief Set a function that is called for every windows message, before TranslateMessage()
+*/
+typedef void (*SDL_WindowsMessageHook)(void *hWnd, unsigned int message, Uint64 wParam, Sint64 lParam);
+extern DECLSPEC void SDLCALL SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback);
 
 /**
    \brief Returns the D3D9 adapter index that matches the specified display index.
diff --git a/src/dynapi/SDL_dynapi_overrides.h b/src/dynapi/SDL_dynapi_overrides.h
index dcc6d4677693f..663feea2f5577 100644
--- a/src/dynapi/SDL_dynapi_overrides.h
+++ b/src/dynapi/SDL_dynapi_overrides.h
@@ -592,3 +592,4 @@
 #define SDL_GetQueuedAudioSize SDL_GetQueuedAudioSize_REAL
 #define SDL_ClearQueuedAudio SDL_ClearQueuedAudio_REAL
 #define SDL_GetGrabbedWindow SDL_GetGrabbedWindow_REAL
+#define SDL_SetWindowsMessageHook SDL_SetWindowsMessageHook_REAL
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index 6408e3f892d7c..e25bbda82559e 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -624,3 +624,4 @@ SDL_DYNAPI_PROC(int,SDL_QueueAudio,(SDL_AudioDeviceID a, const void *b, Uint32 c
 SDL_DYNAPI_PROC(Uint32,SDL_GetQueuedAudioSize,(SDL_AudioDeviceID a),(a),return)
 SDL_DYNAPI_PROC(void,SDL_ClearQueuedAudio,(SDL_AudioDeviceID a),(a),)
 SDL_DYNAPI_PROC(SDL_Window*,SDL_GetGrabbedWindow,(void),(),return)
+SDL_DYNAPI_PROC(void,SDL_SetWindowsMessageHook,(SDL_WindowsMessageHook a),(a),)
diff --git a/src/video/SDL_egl.c b/src/video/SDL_egl.c
old mode 100755
new mode 100644
diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
index 524e67adf7c05..6d0c5957de112 100644
--- a/src/video/windows/SDL_windowsevents.c
+++ b/src/video/windows/SDL_windowsevents.c
@@ -24,6 +24,7 @@
 
 #include "SDL_windowsvideo.h"
 #include "SDL_windowsshape.h"
+#include "SDL_system.h"
 #include "SDL_syswm.h"
 #include "SDL_timer.h"
 #include "SDL_vkeys.h"
@@ -925,6 +926,14 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
     }
 }
 
+/* A message hook called before TranslateMessage() */
+static SDL_WindowsMessageHook g_WindowsMessageHook = NULL;
+
+void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback)
+{
+    g_WindowsMessageHook = callback;
+}
+
 void
 WIN_PumpEvents(_THIS)
 {
@@ -934,6 +943,10 @@ WIN_PumpEvents(_THIS)
 
     if (g_WindowsEnableMessageLoop) {
         while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
+            if (g_WindowsMessageHook) {
+                g_WindowsMessageHook(msg.hwnd, msg.message, msg.wParam, msg.lParam);
+            }
+
             /* Always translate the message in case it's a non-SDL window (e.g. with Qt integration) */
             TranslateMessage(&msg);
             DispatchMessage(&msg);