Merge pull request #9350 from sowfelicity/x11-ime

Workaround for IME on Linux.

platform/x11/godot_x11.cpp

@@ -28,6 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 #include <limits.h>
+#include <locale.h>
 #include <stdlib.h>
 #include <unistd.h>
 
@@ -38,6 +39,8 @@ int main(int argc, char *argv[]) {
 
 	OS_X11 os;
 
+	setlocale(LC_CTYPE, "");
+
 	char *cwd = (char *)malloc(PATH_MAX);
 	getcwd(cwd, PATH_MAX);
 

platform/x11/os_x11.cpp

@@ -93,6 +93,7 @@ const char *OS_X11::get_audio_driver_name(int p_driver) const {
 
 void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
 
+	long im_event_mask = 0;
 	last_button_state = 0;
 
 	xmbstring = NULL;
@@ -113,7 +114,10 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 	/** XLIB INITIALIZATION **/
 	x11_display = XOpenDisplay(NULL);
 
-	char *modifiers = XSetLocaleModifiers("@im=none");
+	char *modifiers = XSetLocaleModifiers("");
+	if (modifiers == NULL) {
+		modifiers = XSetLocaleModifiers("@im=none");
+	}
 	if (modifiers == NULL) {
 		WARN_PRINT("Error setting locale modifiers");
 	}
@@ -153,6 +157,14 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 		WARN_PRINT("XOpenIM failed");
 		xim_style = 0L;
 	} else {
+		::XIMCallback im_destroy_callback;
+		im_destroy_callback.client_data = (::XPointer)(this);
+		im_destroy_callback.callback = (::XIMProc)(xim_destroy_callback);
+		if (XSetIMValues(xim, XNDestroyCallback, &im_destroy_callback,
+					NULL) != NULL) {
+			WARN_PRINT("Error setting XIM destroy callback");
+		}
+
 		::XIMStyles *xim_styles = NULL;
 		xim_style = 0L;
 		char *imvalret = NULL;
@@ -303,7 +315,8 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 						  StructureNotifyMask |
 						  SubstructureNotifyMask | SubstructureRedirectMask |
 						  FocusChangeMask | PropertyChangeMask |
-						  ColormapChangeMask | OwnerGrabButtonMask;
+						  ColormapChangeMask | OwnerGrabButtonMask |
+						  im_event_mask;
 
 	XChangeWindowAttributes(x11_display, x11_window, CWEventMask, &new_attr);
 
@@ -327,6 +340,16 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 	if (xim && xim_style) {
 
 		xic = XCreateIC(xim, XNInputStyle, xim_style, XNClientWindow, x11_window, XNFocusWindow, x11_window, (char *)NULL);
+		if (XGetICValues(xic, XNFilterEvents, &im_event_mask, NULL) != NULL) {
+			WARN_PRINT("XGetICValues couldn't obtain XNFilterEvents value");
+			XDestroyIC(xic);
+			xic = NULL;
+		}
+		if (xic) {
+			XSetICFocus(xic);
+		} else {
+			WARN_PRINT("XCreateIC couldn't create xic");
+		}
 	} else {
 
 		xic = NULL;
@@ -445,6 +468,30 @@ void OS_X11::initialize(const VideoMode &p_desired, int p_video_driver, int p_au
 	_ensure_data_dir();
 }
 
+void OS_X11::xim_destroy_callback(::XIM im, ::XPointer client_data,
+		::XPointer call_data) {
+	WARN_PRINT("Input method stopped");
+	OS_X11 *os = reinterpret_cast<OS_X11 *>(client_data);
+	os->xim = NULL;
+	os->xic = NULL;
+}
+
+void OS_X11::set_ime_position(short x, short y) {
+	if (xic) {
+		::XPoint spot;
+		spot.x = x;
+		spot.y = y;
+		XVaNestedList preedit_attr = XVaCreateNestedList(0,
+				XNSpotLocation, &spot,
+				NULL);
+		XSetICValues(xic,
+				XNPreeditAttributes, preedit_attr,
+				NULL);
+		XFree(preedit_attr);
+	}
+	return;
+}
+
 void OS_X11::finalize() {
 
 	if (main_loop)
@@ -492,8 +539,12 @@ void OS_X11::finalize() {
 			XcursorImageDestroy(img[i]);
 	};
 
+	if (xic) {
 		XDestroyIC(xic);
+	}
+	if (xim) {
 		XCloseIM(xim);
+	}
 
 	XCloseDisplay(x11_display);
 	if (xmbstring)
@@ -1041,11 +1092,61 @@ void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {
 		xmblen = 8;
 	}
 
+	keysym_unicode = keysym_keycode;
+
 	if (xkeyevent->type == KeyPress && xic) {
 
 		Status status;
-		do {
+#ifdef X_HAVE_UTF8_STRING
+		int utf8len = 8;
+		char *utf8string = (char *)memalloc(sizeof(char) * utf8len);
+		int utf8bytes = Xutf8LookupString(xic, xkeyevent, utf8string,
+				utf8len - 1, &keysym_unicode, &status);
+		if (status == XBufferOverflow) {
+			utf8len = utf8bytes + 1;
+			utf8string = (char *)memrealloc(utf8string, utf8len);
+			utf8bytes = Xutf8LookupString(xic, xkeyevent, utf8string,
+					utf8len - 1, &keysym_unicode, &status);
+		}
+		utf8string[utf8bytes] = '\0';
 
+		if (status == XLookupChars) {
+			bool keypress = xkeyevent->type == KeyPress;
+			unsigned int keycode = KeyMappingX11::get_keycode(keysym_keycode);
+			String tmp;
+			tmp.parse_utf8(utf8string, utf8bytes);
+			for (int i = 0; i < tmp.length(); i++) {
+				Ref<InputEventKey> k;
+				k.instance();
+				if (keycode == 0 && tmp[i] == 0) {
+					continue;
+				}
+
+				get_key_modifier_state(xkeyevent->state, k);
+
+				k->set_unicode(tmp[i]);
+
+				k->set_pressed(keypress);
+
+				if (keycode >= 'a' && keycode <= 'z')
+					keycode -= 'a' - 'A';
+				k->set_scancode(keycode);
+
+				k->set_echo(p_echo);
+
+				if (k->get_scancode() == KEY_BACKTAB) {
+					//make it consistent across platforms.
+					k->set_scancode(KEY_TAB);
+					k->set_shift(true);
+				}
+
+				input->parse_input_event(k);
+			}
+			return;
+		}
+		memfree(utf8string);
+#else
+		do {
 			int mnbytes = XmbLookupString(xic, xkeyevent, xmbstring, xmblen - 1, &keysym_unicode, &status);
 			xmbstring[mnbytes] = '\0';
 
@@ -1054,6 +1155,7 @@ void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {
 				xmbstring = (char *)memrealloc(xmbstring, xmblen);
 			}
 		} while (status == XBufferOverflow);
+#endif
 	}
 
 	/* Phase 2, obtain a pigui keycode from the keysym */
@@ -1082,11 +1184,6 @@ void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {
 
 	bool keypress = xkeyevent->type == KeyPress;
 
-	if (xkeyevent->type == KeyPress && xic) {
-		if (XFilterEvent((XEvent *)xkeyevent, x11_window))
-			return;
-	}
-
 	if (keycode == 0 && unicode == 0)
 		return;
 
@@ -1253,6 +1350,10 @@ void OS_X11::process_xevents() {
 		XEvent event;
 		XNextEvent(x11_display, &event);
 
+		if (XFilterEvent(&event, None)) {
+			continue;
+		}
+
 		switch (event.type) {
 			case Expose:
 				Main::force_redraw();
@@ -1295,6 +1396,9 @@ void OS_X11::process_xevents() {
 							ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 							GrabModeAsync, GrabModeAsync, x11_window, None, CurrentTime);
 				}
+				if (xic) {
+					XSetICFocus(xic);
+				}
 				break;
 
 			case FocusOut:
@@ -1308,9 +1412,17 @@ void OS_X11::process_xevents() {
 					}
 					XUngrabPointer(x11_display, CurrentTime);
 				}
+				if (xic) {
+					XUnsetICFocus(xic);
+				}
 				break;
 
 			case ConfigureNotify:
+				if (xic) {
+					//  Not portable.
+					set_ime_position(0, 1);
+				}
+
 				/* call resizeGLScene only if our window-size changed */
 
 				if ((event.xconfigure.width == current_videomode.width) &&

platform/x11/os_x11.h

@@ -113,6 +113,10 @@ class OS_X11 : public OS_Unix {
 	::XIC xic;
 	::XIM xim;
 	::XIMStyle xim_style;
+	static void xim_destroy_callback(::XIM im, ::XPointer client_data,
+			::XPointer call_data);
+	void set_ime_position(short x, short y);
+
 	Point2i last_mouse_pos;
 	bool last_mouse_pos_valid;
 	Point2i last_click_pos;