[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.

1 files changed, 117 insertions, 7 deletions

diff --git a/main/main.cpp b/main/main.cpp
index 82be327cbb..cd97e3282d 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -72,6 +72,7 @@
 #include "servers/register_server_types.h"
 #include "servers/rendering/rendering_server_raster.h"
 #include "servers/rendering/rendering_server_wrap_mt.h"
+#include "servers/text_server.h"
 #include "servers/xr_server.h"
 
 #ifdef TESTS_ENABLED
@@ -113,6 +114,7 @@ static DisplayServer *display_server = nullptr;
 static RenderingServer *rendering_server = nullptr;
 static CameraServer *camera_server = nullptr;
 static XRServer *xr_server = nullptr;
+static TextServerManager *tsman = nullptr;
 static PhysicsServer3D *physics_server = nullptr;
 static PhysicsServer2D *physics_2d_server = nullptr;
 static NavigationServer3D *navigation_server = nullptr;
@@ -122,6 +124,7 @@ static bool _start_success = false;
 
 // Drivers
 
+static int text_driver_idx = -1;
 static int display_driver_idx = -1;
 static int audio_driver_idx = -1;
 
@@ -304,7 +307,18 @@ void Main::print_help(const char *p_binary) {
 		OS::get_singleton()->print(")");
 	}
 	OS::get_singleton()->print("].\n");
+
 	OS::get_singleton()->print("  --rendering-driver <driver>      Rendering driver (depends on display driver).\n");
+
+	OS::get_singleton()->print("  --text-driver <driver>           Text driver (Fonts, BiDi, shaping) [");
+	for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+		if (i > 0) {
+			OS::get_singleton()->print(", ");
+		}
+		OS::get_singleton()->print("'%s'", TextServerManager::get_interface_name(i).utf8().get_data());
+	}
+	OS::get_singleton()->print("].\n");
+
 	OS::get_singleton()->print("\n");
 
 #ifndef SERVER_ENABLED
@@ -544,6 +558,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 
 	I = args.front();
 
+	String text_driver = "";
 	String display_driver = "";
 	String audio_driver = "";
 	String tablet_driver = "";
@@ -649,6 +664,40 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 				OS::get_singleton()->print("Missing audio driver argument, aborting.\n");
 				goto error;
 			}
+		} else if (I->get() == "--text-driver") {
+			if (I->next()) {
+				text_driver = I->next()->get();
+				bool found = false;
+				for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+					if (text_driver == TextServerManager::get_interface_name(i)) {
+						found = true;
+					}
+				}
+
+				if (!found) {
+					OS::get_singleton()->print("Unknown text driver '%s', aborting.\nValid options are ",
+							text_driver.utf8().get_data());
+
+					for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+						if (i == TextServerManager::get_interface_count() - 1) {
+							OS::get_singleton()->print(" and ");
+						} else if (i != 0) {
+							OS::get_singleton()->print(", ");
+						}
+
+						OS::get_singleton()->print("'%s'", TextServerManager::get_interface_name(i).utf8().get_data());
+					}
+
+					OS::get_singleton()->print(".\n");
+
+					goto error;
+				}
+
+				N = I->next()->next();
+			} else {
+				OS::get_singleton()->print("Missing text driver argument, aborting.\n");
+				goto error;
+			}
 
 		} else if (I->get() == "--display-driver") { // force video driver
 
@@ -1159,6 +1208,11 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 
 	OS::get_singleton()->set_cmdline(execpath, main_args);
 
+	GLOBAL_DEF("display/window/text_name", "");
+	if (text_driver == "") {
+		text_driver = GLOBAL_GET("display/window/text_name");
+	}
+
 	GLOBAL_DEF("rendering/quality/driver/driver_name", "Vulkan");
 	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/driver/driver_name",
 			PropertyInfo(Variant::STRING,
@@ -1289,6 +1343,35 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 		OS::get_singleton()->_render_thread_mode = OS::RenderThreadMode(rtm);
 	}
 
+	/* Determine text driver */
+
+	if (text_driver != "") {
+		/* Load user selected text server. */
+		for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+			if (text_driver == TextServerManager::get_interface_name(i)) {
+				text_driver_idx = i;
+				break;
+			}
+		}
+	}
+
+	if (text_driver_idx < 0) {
+		/* If not selected, use one with the most features available. */
+		int max_features = 0;
+		for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+			uint32_t ftrs = TextServerManager::get_interface_features(i);
+			int features = 0;
+			while (ftrs) {
+				features += ftrs & 1;
+				ftrs >>= 1;
+			}
+			if (features >= max_features) {
+				max_features = features;
+				text_driver_idx = i;
+			}
+		}
+	}
+
 	/* Determine audio and video drivers */
 
 	for (int i = 0; i < DisplayServer::get_create_function_count(); i++) {
@@ -1388,6 +1471,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 
 error:
 
+	text_driver = "";
 	display_driver = "";
 	audio_driver = "";
 	tablet_driver = "";
@@ -1449,6 +1533,30 @@ Error Main::setup2(Thread::ID p_main_tid_override) {
 		Thread::_main_thread_id = p_main_tid_override;
 	}
 
+	/* Initialize Text Server */
+
+	{
+		tsman = memnew(TextServerManager);
+		Error err;
+		TextServer *text_server = TextServerManager::initialize(text_driver_idx, err);
+		if (err != OK || text_server == nullptr) {
+			for (int i = 0; i < TextServerManager::get_interface_count(); i++) {
+				if (i == text_driver_idx) {
+					continue; //don't try the same twice
+				}
+				text_server = TextServerManager::initialize(i, err);
+				if (err == OK && text_server != nullptr) {
+					break;
+				}
+			}
+		}
+
+		if (err != OK || text_server == nullptr) {
+			ERR_PRINT("Unable to create TextServer, all text drivers failed.");
+			return err;
+		}
+	}
+
 	/* Initialize Input */
 
 	input = memnew(Input);
@@ -1459,23 +1567,21 @@ Error Main::setup2(Thread::ID p_main_tid_override) {
 		String rendering_driver; // temp broken
 
 		Error err;
-		display_server = DisplayServer::create(display_driver_idx, rendering_driver, window_mode, window_flags,
-				window_size, err);
-		if (err != OK) {
+		display_server = DisplayServer::create(display_driver_idx, rendering_driver, window_mode, window_flags, window_size, err);
+		if (err != OK || display_server == nullptr) {
 			//ok i guess we can't use this display server, try other ones
 			for (int i = 0; i < DisplayServer::get_create_function_count(); i++) {
 				if (i == display_driver_idx) {
 					continue; //don't try the same twice
 				}
-				display_server = DisplayServer::create(display_driver_idx, rendering_driver, window_mode, window_flags,
-						window_size, err);
-				if (err == OK) {
+				display_server = DisplayServer::create(i, rendering_driver, window_mode, window_flags, window_size, err);
+				if (err == OK && display_server != nullptr) {
 					break;
 				}
 			}
 		}
 
-		if (!display_server || err != OK) {
+		if (err != OK || display_server == nullptr) {
 			ERR_PRINT("Unable to create DisplayServer, all display drivers failed.");
 			return err;
 		}
@@ -2572,6 +2678,10 @@ void Main::cleanup() {
 	finalize_navigation_server();
 	finalize_display();
 
+	if (tsman) {
+		memdelete(tsman);
+	}
+
 	if (input) {
 		memdelete(input);
 	}