1 files changed, 314 insertions, 99 deletions

diff --git a/platform/linuxbsd/x11/display_server_x11.cpp b/platform/linuxbsd/x11/display_server_x11.cpp
index 8343370533..8724bc871a 100644
--- a/platform/linuxbsd/x11/display_server_x11.cpp
+++ b/platform/linuxbsd/x11/display_server_x11.cpp
@@ -32,12 +32,13 @@
 
 #ifdef X11_ENABLED
 
+#include "x11/detect_prime_x11.h"
+#include "x11/key_mapping_x11.h"
+
 #include "core/config/project_settings.h"
 #include "core/math/math_funcs.h"
 #include "core/string/print_string.h"
 #include "core/string/ustring.h"
-#include "detect_prime_x11.h"
-#include "key_mapping_x11.h"
 #include "main/main.h"
 #include "scene/resources/texture.h"
 
@@ -58,6 +59,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#undef CursorShape
+#include <X11/XKBlib.h>
+
 // ICCCM
 #define WM_NormalState 1L // window normal state
 #define WM_IconicState 3L // window minimized
@@ -65,9 +69,6 @@
 #define _NET_WM_STATE_REMOVE 0L // remove/unset property
 #define _NET_WM_STATE_ADD 1L // add/set property
 
-#undef CursorShape
-#include <X11/XKBlib.h>
-
 // 2.2 is the first release with multitouch
 #define XINPUT_CLIENT_VERSION_MAJOR 2
 #define XINPUT_CLIENT_VERSION_MINOR 2
@@ -186,6 +187,7 @@ bool DisplayServerX11::_refresh_device_info() {
 	xi.absolute_devices.clear();
 	xi.touch_devices.clear();
 	xi.pen_inverted_devices.clear();
+	xi.last_relative_time = 0;
 
 	int dev_count;
 	XIDeviceInfo *info = XIQueryDevice(x11_display, XIAllDevices, &dev_count);
@@ -302,37 +304,37 @@ void DisplayServerX11::_flush_mouse_motion() {
 #ifdef SPEECHD_ENABLED
 
 bool DisplayServerX11::tts_is_speaking() const {
-	ERR_FAIL_COND_V(!tts, false);
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	return tts->is_speaking();
 }
 
 bool DisplayServerX11::tts_is_paused() const {
-	ERR_FAIL_COND_V(!tts, false);
+	ERR_FAIL_COND_V_MSG(!tts, false, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	return tts->is_paused();
 }
 
 TypedArray<Dictionary> DisplayServerX11::tts_get_voices() const {
-	ERR_FAIL_COND_V(!tts, TypedArray<Dictionary>());
+	ERR_FAIL_COND_V_MSG(!tts, TypedArray<Dictionary>(), "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	return tts->get_voices();
 }
 
 void DisplayServerX11::tts_speak(const String &p_text, const String &p_voice, int p_volume, float p_pitch, float p_rate, int p_utterance_id, bool p_interrupt) {
-	ERR_FAIL_COND(!tts);
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	tts->speak(p_text, p_voice, p_volume, p_pitch, p_rate, p_utterance_id, p_interrupt);
 }
 
 void DisplayServerX11::tts_pause() {
-	ERR_FAIL_COND(!tts);
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	tts->pause();
 }
 
 void DisplayServerX11::tts_resume() {
-	ERR_FAIL_COND(!tts);
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	tts->resume();
 }
 
 void DisplayServerX11::tts_stop() {
-	ERR_FAIL_COND(!tts);
+	ERR_FAIL_COND_MSG(!tts, "Enable the \"audio/general/text_to_speech\" project setting to use text-to-speech.");
 	tts->stop();
 }
 
@@ -753,23 +755,56 @@ int DisplayServerX11::get_screen_count() const {
 }
 
 int DisplayServerX11::get_primary_screen() const {
-	return XDefaultScreen(x11_display);
+	int event_base, error_base;
+	if (XineramaQueryExtension(x11_display, &event_base, &error_base)) {
+		return 0;
+	} else {
+		return XDefaultScreen(x11_display);
+	}
 }
 
-Rect2i DisplayServerX11::_screen_get_rect(int p_screen) const {
-	Rect2i rect(0, 0, 0, 0);
+int DisplayServerX11::get_keyboard_focus_screen() const {
+	int count = get_screen_count();
+	if (count < 2) {
+		// Early exit with single monitor.
+		return 0;
+	}
 
-	switch (p_screen) {
-		case SCREEN_PRIMARY: {
-			p_screen = get_primary_screen();
-		} break;
-		case SCREEN_OF_MAIN_WINDOW: {
-			p_screen = window_get_current_screen(MAIN_WINDOW_ID);
-		} break;
-		default:
-			break;
+	Window focus = 0;
+	int revert_to = 0;
+
+	XGetInputFocus(x11_display, &focus, &revert_to);
+	if (focus) {
+		Window focus_child = 0;
+		int x = 0, y = 0;
+		XTranslateCoordinates(x11_display, focus, DefaultRootWindow(x11_display), 0, 0, &x, &y, &focus_child);
+
+		XWindowAttributes xwa;
+		XGetWindowAttributes(x11_display, focus, &xwa);
+		Rect2i window_rect = Rect2i(x, y, xwa.width, xwa.height);
+
+		// Find which monitor has the largest overlap with the given window.
+		int screen_index = 0;
+		int max_area = 0;
+		for (int i = 0; i < count; i++) {
+			Rect2i screen_rect = _screen_get_rect(i);
+			Rect2i intersection = screen_rect.intersection(window_rect);
+			int area = intersection.get_area();
+			if (area > max_area) {
+				max_area = area;
+				screen_index = i;
+			}
+		}
+		return screen_index;
 	}
 
+	return get_primary_screen();
+}
+
+Rect2i DisplayServerX11::_screen_get_rect(int p_screen) const {
+	Rect2i rect(0, 0, 0, 0);
+
+	p_screen = _get_screen_index(p_screen);
 	ERR_FAIL_COND_V(p_screen < 0, rect);
 
 	// Using Xinerama Extension.
@@ -821,12 +856,30 @@ Size2i DisplayServerX11::screen_get_size(int p_screen) const {
 	return _screen_get_rect(p_screen).size;
 }
 
+// A Handler to avoid crashing on non-fatal X errors by default.
+//
+// The original X11 error formatter `_XPrintDefaultError` is defined here:
+// https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/e45ca7b41dcd3ace7681d6897505f85d374640f2/src/XlibInt.c#L1322
+// It is not exposed through the API, accesses X11 internals,
+// and is much more complex, so this is a less complete simplified error X11 printer.
+int default_window_error_handler(Display *display, XErrorEvent *error) {
+	static char message[1024];
+	XGetErrorText(display, error->error_code, message, sizeof(message));
+
+	ERR_PRINT(vformat("Unhandled XServer error: %s"
+					  "\n   Major opcode of failed request: %d"
+					  "\n   Serial number of failed request: %d"
+					  "\n   Current serial number in output stream: %d",
+			String::utf8(message), (uint64_t)error->request_code, (uint64_t)error->minor_code, (uint64_t)error->serial));
+	return 0;
+}
+
 bool g_bad_window = false;
 int bad_window_error_handler(Display *display, XErrorEvent *error) {
 	if (error->error_code == BadWindow) {
 		g_bad_window = true;
 	} else {
-		ERR_PRINT("Unhandled XServer error code: " + itos(error->error_code));
+		return default_window_error_handler(display, error);
 	}
 	return 0;
 }
@@ -834,17 +887,7 @@ int bad_window_error_handler(Display *display, XErrorEvent *error) {
 Rect2i DisplayServerX11::screen_get_usable_rect(int p_screen) const {
 	_THREAD_SAFE_METHOD_
 
-	switch (p_screen) {
-		case SCREEN_PRIMARY: {
-			p_screen = get_primary_screen();
-		} break;
-		case SCREEN_OF_MAIN_WINDOW: {
-			p_screen = window_get_current_screen(MAIN_WINDOW_ID);
-		} break;
-		default:
-			break;
-	}
-
+	p_screen = _get_screen_index(p_screen);
 	int screen_count = get_screen_count();
 
 	// Check if screen is valid.
@@ -1121,18 +1164,7 @@ Rect2i DisplayServerX11::screen_get_usable_rect(int p_screen) const {
 int DisplayServerX11::screen_get_dpi(int p_screen) const {
 	_THREAD_SAFE_METHOD_
 
-	switch (p_screen) {
-		case SCREEN_PRIMARY: {
-			p_screen = get_primary_screen();
-		} break;
-		case SCREEN_OF_MAIN_WINDOW: {
-			p_screen = window_get_current_screen(MAIN_WINDOW_ID);
-		} break;
-		default:
-			break;
-	}
-
-	//invalid screen?
+	p_screen = _get_screen_index(p_screen);
 	ERR_FAIL_INDEX_V(p_screen, get_screen_count(), 0);
 
 	//Get physical monitor Dimensions through XRandR and calculate dpi
@@ -1193,8 +1225,8 @@ Color DisplayServerX11::screen_get_pixel(const Point2i &p_position) const {
 	return Color();
 }
 
-float DisplayServerX11::screen_get_refresh_rate(int p_screen) const {
-	_THREAD_SAFE_METHOD_
+Ref<Image> DisplayServerX11::screen_get_image(int p_screen) const {
+	ERR_FAIL_INDEX_V(p_screen, get_screen_count(), Ref<Image>());
 
 	switch (p_screen) {
 		case SCREEN_PRIMARY: {
@@ -1207,7 +1239,95 @@ float DisplayServerX11::screen_get_refresh_rate(int p_screen) const {
 			break;
 	}
 
-	//invalid screen?
+	ERR_FAIL_COND_V(p_screen < 0, Ref<Image>());
+
+	XImage *image = nullptr;
+
+	int event_base, error_base;
+	if (XineramaQueryExtension(x11_display, &event_base, &error_base)) {
+		int xin_count;
+		XineramaScreenInfo *xsi = XineramaQueryScreens(x11_display, &xin_count);
+		if (p_screen < xin_count) {
+			int x_count = XScreenCount(x11_display);
+			for (int i = 0; i < x_count; i++) {
+				Window root = XRootWindow(x11_display, i);
+				XWindowAttributes root_attrs;
+				XGetWindowAttributes(x11_display, root, &root_attrs);
+				if ((xsi[p_screen].x_org >= root_attrs.x) && (xsi[p_screen].x_org <= root_attrs.x + root_attrs.width) && (xsi[p_screen].y_org >= root_attrs.y) && (xsi[p_screen].y_org <= root_attrs.y + root_attrs.height)) {
+					image = XGetImage(x11_display, root, xsi[p_screen].x_org, xsi[p_screen].y_org, xsi[p_screen].width, xsi[p_screen].height, AllPlanes, ZPixmap);
+					break;
+				}
+			}
+		} else {
+			ERR_FAIL_V_MSG(Ref<Image>(), "Invalid screen index: " + itos(p_screen) + "(count: " + itos(xin_count) + ").");
+		}
+	} else {
+		int x_count = XScreenCount(x11_display);
+		if (p_screen < x_count) {
+			Window root = XRootWindow(x11_display, p_screen);
+
+			XWindowAttributes root_attrs;
+			XGetWindowAttributes(x11_display, root, &root_attrs);
+
+			image = XGetImage(x11_display, root, root_attrs.x, root_attrs.y, root_attrs.width, root_attrs.height, AllPlanes, ZPixmap);
+		} else {
+			ERR_FAIL_V_MSG(Ref<Image>(), "Invalid screen index: " + itos(p_screen) + "(count: " + itos(x_count) + ").");
+		}
+	}
+
+	Ref<Image> img;
+	if (image) {
+		int width = image->width;
+		int height = image->height;
+
+		Vector<uint8_t> img_data;
+		img_data.resize(height * width * 4);
+
+		uint8_t *sr = (uint8_t *)image->data;
+		uint8_t *wr = (uint8_t *)img_data.ptrw();
+
+		if (image->bits_per_pixel == 24 && image->red_mask == 0xff0000 && image->green_mask == 0x00ff00 && image->blue_mask == 0x0000ff) {
+			for (int y = 0; y < height; y++) {
+				for (int x = 0; x < width; x++) {
+					wr[(y * width + x) * 4 + 0] = sr[(y * width + x) * 3 + 2];
+					wr[(y * width + x) * 4 + 1] = sr[(y * width + x) * 3 + 1];
+					wr[(y * width + x) * 4 + 2] = sr[(y * width + x) * 3 + 0];
+					wr[(y * width + x) * 4 + 3] = 255;
+				}
+			}
+		} else if (image->bits_per_pixel == 24 && image->red_mask == 0x0000ff && image->green_mask == 0x00ff00 && image->blue_mask == 0xff0000) {
+			for (int y = 0; y < height; y++) {
+				for (int x = 0; x < width; x++) {
+					wr[(y * width + x) * 4 + 0] = sr[(y * width + x) * 3 + 2];
+					wr[(y * width + x) * 4 + 1] = sr[(y * width + x) * 3 + 1];
+					wr[(y * width + x) * 4 + 2] = sr[(y * width + x) * 3 + 0];
+					wr[(y * width + x) * 4 + 3] = 255;
+				}
+			}
+		} else if (image->bits_per_pixel == 32 && image->red_mask == 0xff0000 && image->green_mask == 0x00ff00 && image->blue_mask == 0x0000ff) {
+			for (int y = 0; y < height; y++) {
+				for (int x = 0; x < width; x++) {
+					wr[(y * width + x) * 4 + 0] = sr[(y * width + x) * 4 + 2];
+					wr[(y * width + x) * 4 + 1] = sr[(y * width + x) * 4 + 1];
+					wr[(y * width + x) * 4 + 2] = sr[(y * width + x) * 4 + 0];
+					wr[(y * width + x) * 4 + 3] = 255;
+				}
+			}
+		} else {
+			XFree(image);
+			ERR_FAIL_V_MSG(Ref<Image>(), vformat("XImage with RGB mask %x %x %x and depth %d is not supported.", (uint64_t)image->red_mask, (uint64_t)image->green_mask, (uint64_t)image->blue_mask, (int64_t)image->bits_per_pixel));
+		}
+		img = Image::create_from_data(width, height, false, Image::FORMAT_RGBA8, img_data);
+		XFree(image);
+	}
+
+	return img;
+}
+
+float DisplayServerX11::screen_get_refresh_rate(int p_screen) const {
+	_THREAD_SAFE_METHOD_
+
+	p_screen = _get_screen_index(p_screen);
 	ERR_FAIL_INDEX_V(p_screen, get_screen_count(), SCREEN_REFRESH_RATE_FALLBACK);
 
 	//Use xrandr to get screen refresh rate.
@@ -1354,7 +1474,7 @@ void DisplayServerX11::delete_sub_window(WindowID p_id) {
 	}
 	XDestroyWindow(x11_display, wd.x11_xim_window);
 #ifdef XKB_ENABLED
-	if (xkb_loaded) {
+	if (xkb_loaded_v05p) {
 		if (wd.xkb_state) {
 			xkb_compose_state_unref(wd.xkb_state);
 			wd.xkb_state = nullptr;
@@ -1570,18 +1690,7 @@ void DisplayServerX11::window_set_current_screen(int p_screen, WindowID p_window
 	ERR_FAIL_COND(!windows.has(p_window));
 	WindowData &wd = windows[p_window];
 
-	switch (p_screen) {
-		case SCREEN_PRIMARY: {
-			p_screen = get_primary_screen();
-		} break;
-		case SCREEN_OF_MAIN_WINDOW: {
-			p_screen = window_get_current_screen(MAIN_WINDOW_ID);
-		} break;
-		default:
-			break;
-	}
-
-	// Check if screen is valid
+	p_screen = _get_screen_index(p_screen);
 	ERR_FAIL_INDEX(p_screen, get_screen_count());
 
 	if (window_get_current_screen(p_window) == p_screen) {
@@ -2517,6 +2626,15 @@ void DisplayServerX11::window_move_to_foreground(WindowID p_window) {
 	XFlush(x11_display);
 }
 
+bool DisplayServerX11::window_is_focused(WindowID p_window) const {
+	_THREAD_SAFE_METHOD_
+
+	ERR_FAIL_COND_V(!windows.has(p_window), false);
+	const WindowData &wd = windows[p_window];
+
+	return wd.focused;
+}
+
 bool DisplayServerX11::window_can_draw(WindowID p_window) const {
 	//this seems to be all that is provided by X11
 	return window_get_mode(p_window) != WINDOW_MODE_MINIMIZED;
@@ -2654,16 +2772,12 @@ void DisplayServerX11::cursor_set_custom_image(const Ref<Resource> &p_cursor, Cu
 		}
 
 		Ref<Texture2D> texture = p_cursor;
+		ERR_FAIL_COND(!texture.is_valid());
 		Ref<AtlasTexture> atlas_texture = p_cursor;
-		Ref<Image> image;
 		Size2i texture_size;
 		Rect2i atlas_rect;
 
-		if (texture.is_valid()) {
-			image = texture->get_image();
-		}
-
-		if (!image.is_valid() && atlas_texture.is_valid()) {
+		if (atlas_texture.is_valid()) {
 			texture = atlas_texture->get_atlas();
 
 			atlas_rect.size.width = texture->get_width();
@@ -2673,19 +2787,23 @@ void DisplayServerX11::cursor_set_custom_image(const Ref<Resource> &p_cursor, Cu
 
 			texture_size.width = atlas_texture->get_region().size.x;
 			texture_size.height = atlas_texture->get_region().size.y;
-		} else if (image.is_valid()) {
+		} else {
 			texture_size.width = texture->get_width();
 			texture_size.height = texture->get_height();
 		}
 
-		ERR_FAIL_COND(!texture.is_valid());
 		ERR_FAIL_COND(p_hotspot.x < 0 || p_hotspot.y < 0);
 		ERR_FAIL_COND(texture_size.width > 256 || texture_size.height > 256);
 		ERR_FAIL_COND(p_hotspot.x > texture_size.width || p_hotspot.y > texture_size.height);
 
-		image = texture->get_image();
+		Ref<Image> image = texture->get_image();
 
 		ERR_FAIL_COND(!image.is_valid());
+		if (image->is_compressed()) {
+			image = image->duplicate(true);
+			Error err = image->decompress();
+			ERR_FAIL_COND_MSG(err != OK, "Couldn't decompress VRAM-compressed custom mouse cursor image. Switch to a lossless compression mode in the Import dock.");
+		}
 
 		// Create the cursor structure
 		XcursorImage *cursor_image = XcursorImageCreate(texture_size.width, texture_size.height);
@@ -2734,15 +2852,15 @@ void DisplayServerX11::cursor_set_custom_image(const Ref<Resource> &p_cursor, Cu
 		XcursorImageDestroy(cursor_image);
 	} else {
 		// Reset to default system cursor
-		if (img[p_shape]) {
-			cursors[p_shape] = XcursorImageLoadCursor(x11_display, img[p_shape]);
+		if (cursor_img[p_shape]) {
+			cursors[p_shape] = XcursorImageLoadCursor(x11_display, cursor_img[p_shape]);
 		}
 
+		cursors_cache.erase(p_shape);
+
 		CursorShape c = current_cursor;
 		current_cursor = CURSOR_MAX;
 		cursor_set_shape(c);
-
-		cursors_cache.erase(p_shape);
 	}
 }
 
@@ -2848,7 +2966,7 @@ Key DisplayServerX11::keyboard_get_keycode_from_physical(Key p_keycode) const {
 	Key modifiers = p_keycode & KeyModifierMask::MODIFIER_MASK;
 	Key keycode_no_mod = p_keycode & KeyModifierMask::CODE_MASK;
 	unsigned int xkeycode = KeyMappingX11::get_xlibcode(keycode_no_mod);
-	KeySym xkeysym = XkbKeycodeToKeysym(x11_display, xkeycode, 0, 0);
+	KeySym xkeysym = XkbKeycodeToKeysym(x11_display, xkeycode, keyboard_get_current_layout(), 0);
 	if (is_ascii_lower_case(xkeysym)) {
 		xkeysym -= ('a' - 'A');
 	}
@@ -2987,7 +3105,7 @@ void DisplayServerX11::_handle_key_event(WindowID p_window, XKeyEvent *p_event,
 
 	String keysym;
 #ifdef XKB_ENABLED
-	if (xkb_loaded) {
+	if (xkb_loaded_v08p) {
 		KeySym keysym_unicode_nm = 0; // keysym used to find unicode
 		XLookupString(&xkeyevent_no_mod, nullptr, 0, &keysym_unicode_nm, nullptr);
 		keysym = String::chr(xkb_keysym_to_utf32(xkb_keysym_to_upper(keysym_unicode_nm)));
@@ -3082,7 +3200,7 @@ void DisplayServerX11::_handle_key_event(WindowID p_window, XKeyEvent *p_event,
 		} while (status == XBufferOverflow);
 #endif
 #ifdef XKB_ENABLED
-	} else if (xkeyevent->type == KeyPress && wd.xkb_state && xkb_loaded) {
+	} else if (xkeyevent->type == KeyPress && wd.xkb_state && xkb_loaded_v05p) {
 		xkb_compose_feed_result res = xkb_compose_state_feed(wd.xkb_state, keysym_unicode);
 		if (res == XKB_COMPOSE_FEED_ACCEPTED) {
 			if (xkb_compose_state_get_status(wd.xkb_state) == XKB_COMPOSE_COMPOSED) {
@@ -3507,8 +3625,17 @@ void DisplayServerX11::_window_changed(XEvent *event) {
 
 	// Query display server about a possible new window state.
 	wd.fullscreen = _window_fullscreen_check(window_id);
-	wd.minimized = _window_minimize_check(window_id);
-	wd.maximized = _window_maximize_check(window_id, "_NET_WM_STATE");
+	wd.maximized = _window_maximize_check(window_id, "_NET_WM_STATE") && !wd.fullscreen;
+	wd.minimized = _window_minimize_check(window_id) && !wd.fullscreen && !wd.maximized;
+
+	// Readjusting the window position if the window is being reparented by the window manager for decoration
+	Window root, parent, *children;
+	unsigned int nchildren;
+	if (XQueryTree(x11_display, wd.x11_window, &root, &parent, &children, &nchildren) && wd.parent != parent) {
+		wd.parent = parent;
+		window_set_position(wd.position, window_id);
+	}
+	XFree(children);
 
 	{
 		//the position in xconfigure is not useful here, obtain it manually
@@ -4994,12 +5121,13 @@ DisplayServerX11::WindowID DisplayServerX11::_create_window(WindowMode p_mode, V
 	{
 		wd.x11_window = XCreateWindow(x11_display, RootWindow(x11_display, visualInfo.screen), win_rect.position.x, win_rect.position.y, win_rect.size.width > 0 ? win_rect.size.width : 1, win_rect.size.height > 0 ? win_rect.size.height : 1, 0, visualInfo.depth, InputOutput, visualInfo.visual, valuemask, &windowAttributes);
 
+		wd.parent = RootWindow(x11_display, visualInfo.screen);
 		XSetWindowAttributes window_attributes_ime = {};
 		window_attributes_ime.event_mask = KeyPressMask | KeyReleaseMask | StructureNotifyMask | ExposureMask;
 
 		wd.x11_xim_window = XCreateWindow(x11_display, wd.x11_window, 0, 0, 1, 1, 0, CopyFromParent, InputOnly, CopyFromParent, CWEventMask, &window_attributes_ime);
 #ifdef XKB_ENABLED
-		if (dead_tbl && xkb_loaded) {
+		if (dead_tbl && xkb_loaded_v05p) {
 			wd.xkb_state = xkb_compose_state_new(dead_tbl, XKB_COMPOSE_STATE_NO_FLAGS);
 		}
 #endif
@@ -5283,9 +5411,16 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 		ERR_FAIL_MSG("Can't load XCursor dynamically.");
 	}
 #ifdef XKB_ENABLED
-	xkb_loaded = (initialize_xkbcommon(dylibloader_verbose) == 0);
-	if (!xkb_context_new || !xkb_compose_table_new_from_locale || !xkb_compose_table_unref || !xkb_context_unref || !xkb_compose_state_feed || !xkb_compose_state_unref || !xkb_compose_state_new || !xkb_compose_state_get_status || !xkb_compose_state_get_utf8 || !xkb_keysym_to_utf32 || !xkb_keysym_to_upper) {
-		xkb_loaded = false;
+	bool xkb_loaded = (initialize_xkbcommon(dylibloader_verbose) == 0);
+	xkb_loaded_v05p = xkb_loaded;
+	if (!xkb_context_new || !xkb_compose_table_new_from_locale || !xkb_compose_table_unref || !xkb_context_unref || !xkb_compose_state_feed || !xkb_compose_state_unref || !xkb_compose_state_new || !xkb_compose_state_get_status || !xkb_compose_state_get_utf8) {
+		xkb_loaded_v05p = false;
+		print_verbose("Detected XKBcommon library version older than 0.5, dead key composition and Unicode key labels disabled.");
+	}
+	xkb_loaded_v08p = xkb_loaded;
+	if (!xkb_keysym_to_utf32 || !xkb_keysym_to_upper) {
+		xkb_loaded_v08p = false;
+		print_verbose("Detected XKBcommon library version older than 0.8, Unicode key labels disabled.");
 	}
 #endif
 	if (initialize_xext(dylibloader_verbose) != 0) {
@@ -5341,9 +5476,18 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 	r_error = OK;
 
+	{
+		if (!XcursorImageCreate || !XcursorImageLoadCursor || !XcursorImageDestroy || !XcursorGetDefaultSize || !XcursorGetTheme || !XcursorLibraryLoadImage) {
+			// There's no API to check version, check if functions are available instead.
+			ERR_PRINT("Unsupported Xcursor library version.");
+			r_error = ERR_UNAVAILABLE;
+			return;
+		}
+	}
+
 	for (int i = 0; i < CURSOR_MAX; i++) {
 		cursors[i] = None;
-		img[i] = nullptr;
+		cursor_img[i] = nullptr;
 	}
 
 	XInitThreads(); //always use threads
@@ -5357,6 +5501,71 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 		return;
 	}
 
+	{
+		int version_major = 0;
+		int version_minor = 0;
+		int rc = XShapeQueryVersion(x11_display, &version_major, &version_minor);
+		print_verbose(vformat("Xshape %d.%d detected.", version_major, version_minor));
+		if (rc != 1 || version_major < 1) {
+			ERR_PRINT("Unsupported Xshape library version.");
+			r_error = ERR_UNAVAILABLE;
+			XCloseDisplay(x11_display);
+			return;
+		}
+	}
+
+	{
+		int version_major = 0;
+		int version_minor = 0;
+		int rc = XineramaQueryVersion(x11_display, &version_major, &version_minor);
+		print_verbose(vformat("Xinerama %d.%d detected.", version_major, version_minor));
+		if (rc != 1 || version_major < 1) {
+			ERR_PRINT("Unsupported Xinerama library version.");
+			r_error = ERR_UNAVAILABLE;
+			XCloseDisplay(x11_display);
+			return;
+		}
+	}
+
+	{
+		int version_major = 0;
+		int version_minor = 0;
+		int rc = XRRQueryVersion(x11_display, &version_major, &version_minor);
+		print_verbose(vformat("Xrandr %d.%d detected.", version_major, version_minor));
+		if (rc != 1 || (version_major == 1 && version_minor < 3) || (version_major < 1)) {
+			ERR_PRINT("Unsupported Xrandr library version.");
+			r_error = ERR_UNAVAILABLE;
+			XCloseDisplay(x11_display);
+			return;
+		}
+	}
+
+	{
+		int version_major = 0;
+		int version_minor = 0;
+		int rc = XRenderQueryVersion(x11_display, &version_major, &version_minor);
+		print_verbose(vformat("Xrender %d.%d detected.", version_major, version_minor));
+		if (rc != 1 || (version_major == 0 && version_minor < 11)) {
+			ERR_PRINT("Unsupported Xrender library version.");
+			r_error = ERR_UNAVAILABLE;
+			XCloseDisplay(x11_display);
+			return;
+		}
+	}
+
+	{
+		int version_major = 2; // Report 2.2 as supported by engine, but should work with 2.1 or 2.0 library as well.
+		int version_minor = 2;
+		int rc = XIQueryVersion(x11_display, &version_major, &version_minor);
+		print_verbose(vformat("Xinput %d.%d detected.", version_major, version_minor));
+		if (rc != Success || (version_major < 2)) {
+			ERR_PRINT("Unsupported Xinput2 library version.");
+			r_error = ERR_UNAVAILABLE;
+			XCloseDisplay(x11_display);
+			return;
+		}
+	}
+
 	char *modifiers = nullptr;
 	Bool xkb_dar = False;
 	XAutoRepeatOn(x11_display);
@@ -5471,7 +5680,10 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 #ifdef SPEECHD_ENABLED
 	// Init TTS
-	tts = memnew(TTS_Linux);
+	bool tts_enabled = GLOBAL_GET("audio/general/text_to_speech");
+	if (tts_enabled) {
+		tts = memnew(TTS_Linux);
+	}
 #endif
 
 	//!!!!!!!!!!!!!!!!!!!!!!!!!!
@@ -5635,8 +5847,8 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 			"question_arrow"
 		};
 
-		img[i] = XcursorLibraryLoadImage(cursor_file[i], cursor_theme, cursor_size);
-		if (!img[i]) {
+		cursor_img[i] = XcursorLibraryLoadImage(cursor_file[i], cursor_theme, cursor_size);
+		if (!cursor_img[i]) {
 			const char *fallback = nullptr;
 
 			switch (i) {
@@ -5674,7 +5886,7 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 					fallback = "bd_double_arrow";
 					break;
 				case CURSOR_MOVE:
-					img[i] = img[CURSOR_DRAG];
+					cursor_img[i] = cursor_img[CURSOR_DRAG];
 					break;
 				case CURSOR_VSPLIT:
 					fallback = "sb_v_double_arrow";
@@ -5687,11 +5899,11 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 					break;
 			}
 			if (fallback != nullptr) {
-				img[i] = XcursorLibraryLoadImage(fallback, cursor_theme, cursor_size);
+				cursor_img[i] = XcursorLibraryLoadImage(fallback, cursor_theme, cursor_size);
 			}
 		}
-		if (img[i]) {
-			cursors[i] = XcursorImageLoadCursor(x11_display, img[i]);
+		if (cursor_img[i]) {
+			cursors[i] = XcursorImageLoadCursor(x11_display, cursor_img[i]);
 		} else {
 			print_verbose("Failed loading custom cursor: " + String(cursor_file[i]));
 		}
@@ -5746,6 +5958,7 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 
 	portal_desktop = memnew(FreeDesktopPortalDesktop);
 #endif
+	XSetErrorHandler(&default_window_error_handler);
 
 	r_error = OK;
 }
@@ -5779,7 +5992,7 @@ DisplayServerX11::~DisplayServerX11() {
 		}
 		XDestroyWindow(x11_display, wd.x11_xim_window);
 #ifdef XKB_ENABLED
-		if (xkb_loaded) {
+		if (xkb_loaded_v05p) {
 			if (wd.xkb_state) {
 				xkb_compose_state_unref(wd.xkb_state);
 				wd.xkb_state = nullptr;
@@ -5791,7 +6004,7 @@ DisplayServerX11::~DisplayServerX11() {
 	}
 
 #ifdef XKB_ENABLED
-	if (xkb_loaded) {
+	if (xkb_loaded_v05p) {
 		if (dead_tbl) {
 			xkb_compose_table_unref(dead_tbl);
 		}
@@ -5830,8 +6043,8 @@ DisplayServerX11::~DisplayServerX11() {
 		if (cursors[i] != None) {
 			XFreeCursor(x11_display, cursors[i]);
 		}
-		if (img[i] != nullptr) {
-			XcursorImageDestroy(img[i]);
+		if (cursor_img[i] != nullptr) {
+			XcursorImageDestroy(cursor_img[i]);
 		}
 	}
 
@@ -5845,7 +6058,9 @@ DisplayServerX11::~DisplayServerX11() {
 	}
 
 #ifdef SPEECHD_ENABLED
-	memdelete(tts);
+	if (tts) {
+		memdelete(tts);
+	}
 #endif
 
 #ifdef DBUS_ENABLED