Fixed building and using fcitx IME support on Linux

docs/README-linux.md

@@ -19,7 +19,8 @@ sudo apt-get install build-essential mercurial make cmake autoconf automake \
 libtool libasound2-dev libpulse-dev libaudio-dev libx11-dev libxext-dev \
 libxrandr-dev libxcursor-dev libxi-dev libxinerama-dev libxxf86vm-dev \
 libxss-dev libgl1-mesa-dev libesd0-dev libdbus-1-dev libudev-dev \
-libgles1-mesa-dev libgles2-mesa-dev libegl1-mesa-dev libibus-1.0-dev
+libgles1-mesa-dev libgles2-mesa-dev libegl1-mesa-dev libibus-1.0-dev \
+fcitx-libs-dev
 
 Ubuntu 16.04 can also add "libwayland-dev libxkbcommon-dev wayland-protocols"
 to that command line for Wayland support.

src/core/linux/SDL_fcitx.c

@@ -62,7 +62,7 @@ static int
 GetDisplayNumber()
 {
     const char *display = SDL_getenv("DISPLAY");
-    const char *p = NULL;;
+    const char *p = NULL;
     int number = 0;
 
     if (display == NULL)

src/core/linux/SDL_ime.c

@@ -43,30 +43,22 @@ static void
 InitIME()
 {
     static SDL_bool inited = SDL_FALSE;
-    const char *im_module = NULL;
+    const char *im_module;
+    const char *xmodifiers = SDL_getenv("XMODIFIERS");
 
     if (inited == SDL_TRUE)
-        return ;
+        return;
 
     inited = SDL_TRUE;
-    // TODO:
-    // better move every ime implenment to a shared library
-
-    // default to IBus
-#ifdef HAVE_IBUS_IBUS_H
-    SDL_IME_Init_Real = SDL_IBus_Init;
-    SDL_IME_Quit_Real = SDL_IBus_Quit;
-    SDL_IME_SetFocus_Real = SDL_IBus_SetFocus;
-    SDL_IME_Reset_Real = SDL_IBus_Reset;
-    SDL_IME_ProcessKeyEvent_Real = SDL_IBus_ProcessKeyEvent;
-    SDL_IME_UpdateTextRect_Real = SDL_IBus_UpdateTextRect;
-    SDL_IME_PumpEvents_Real = SDL_IBus_PumpEvents;
-#endif
 
     im_module = SDL_getenv("SDL_IM_MODULE");
-    if (im_module) {
+    xmodifiers = SDL_getenv("XMODIFIERS");
-        if (SDL_strcmp(im_module, "fcitx") == 0) {
+
+    /* See if fcitx IME support is being requested */
 #ifdef HAVE_FCITX_FRONTEND_H
+    if (!SDL_IME_Init_Real &&
+        ((im_module && SDL_strcmp(im_module, "fcitx") == 0) ||
+         (!im_module && xmodifiers && SDL_strstr(xmodifiers, "@im=fcitx") != NULL))) {
         SDL_IME_Init_Real = SDL_Fcitx_Init;
         SDL_IME_Quit_Real = SDL_Fcitx_Quit;
         SDL_IME_SetFocus_Real = SDL_Fcitx_SetFocus;
@@ -74,9 +66,21 @@ InitIME()
         SDL_IME_ProcessKeyEvent_Real = SDL_Fcitx_ProcessKeyEvent;
         SDL_IME_UpdateTextRect_Real = SDL_Fcitx_UpdateTextRect;
         SDL_IME_PumpEvents_Real = SDL_Fcitx_PumpEvents;
-#endif
     }
+#endif /* HAVE_FCITX_FRONTEND_H */
+
+    /* default to IBus */
+#ifdef HAVE_IBUS_IBUS_H
+    if (!SDL_IME_Init_Real) {
+        SDL_IME_Init_Real = SDL_IBus_Init;
+        SDL_IME_Quit_Real = SDL_IBus_Quit;
+        SDL_IME_SetFocus_Real = SDL_IBus_SetFocus;
+        SDL_IME_Reset_Real = SDL_IBus_Reset;
+        SDL_IME_ProcessKeyEvent_Real = SDL_IBus_ProcessKeyEvent;
+        SDL_IME_UpdateTextRect_Real = SDL_IBus_UpdateTextRect;
+        SDL_IME_PumpEvents_Real = SDL_IBus_PumpEvents;
     }
+#endif /* HAVE_IBUS_IBUS_H */
 }
 
 SDL_bool

src/video/x11/SDL_x11video.c

@@ -397,6 +397,7 @@ X11_VideoInit(_THIS)
         char *prev_xmods  = X11_XSetLocaleModifiers(NULL);
         const char *new_xmods = "";
         const char *env_xmods = SDL_getenv("XMODIFIERS");
+        SDL_bool has_dbus_ime_support = SDL_FALSE;
 
         if (prev_xmods) {
             prev_xmods = SDL_strdup(prev_xmods);
@@ -406,7 +407,17 @@ X11_VideoInit(_THIS)
            when it is used via XIM which causes issues. Prevent this by forcing
            @im=none if XMODIFIERS contains @im=ibus. IBus can still be used via 
            the DBus implementation, which also has support for pre-editing. */
+#ifdef HAVE_IBUS_IBUS_H
         if (env_xmods && SDL_strstr(env_xmods, "@im=ibus") != NULL) {
+            has_dbus_ime_support = SDL_TRUE;
+        }
+#endif
+#ifdef HAVE_FCITX_FRONTEND_H
+        if (env_xmods && SDL_strstr(env_xmods, "@im=fcitx") != NULL) {
+            has_dbus_ime_support = SDL_TRUE;
+        }
+#endif
+        if (has_dbus_ime_support) {
             new_xmods = "@im=none";
         }