Better Cursors

src/main/java/net/silentclient/client/utils/MouseCursorHandler.java

@@ -1,5 +1,6 @@
 package net.silentclient.client.utils;
 
+import net.silentclient.client.utils.cursors.SystemCursors;
 import org.apache.logging.log4j.LogManager;
 import org.lwjgl.BufferUtils;
 import org.lwjgl.LWJGLException;
@@ -69,6 +70,10 @@ public class MouseCursorHandler {
     }
 
     public boolean enableCursor(final CursorType cursorType) {
+        if(SystemCursors.isSupported()) {
+            SystemCursors.setCursor(cursorType.getCursor());
+            return true;
+        } else {
             if (this.customCursorDisabled) {
                 return false;
             }
@@ -92,8 +97,12 @@ public class MouseCursorHandler {
             }
             return false;
         }
+    }
 
     public void disableCursor() {
+        if(SystemCursors.isSupported()) {
+            SystemCursors.setCursor(SystemCursors.ARROW);
+        } else {
             if (this.customCursorDisabled) {
                 return;
             }
@@ -107,18 +116,29 @@ public class MouseCursorHandler {
                 }
             }
         }
+    }
 
     public CursorType getCurrentCursor() {
-        return currentCursor;
+        return CursorType.NORMAL;
     }
 
     public enum CursorType
     {
-        NORMAL,
+        NORMAL(SystemCursors.ARROW),
-        NESW_RESIZE,
+        NESW_RESIZE(SystemCursors.RESIZE_NESW),
-        NWSE_RESIZE,
+        NWSE_RESIZE(SystemCursors.RESIZE_NWSE),
-        MOVE,
+        MOVE(SystemCursors.CROSSHAIR),
-        EDIT_TEXT,
+        EDIT_TEXT(SystemCursors.IBEAM),
-        POINTER;
+        POINTER(SystemCursors.POINTING_HAND);
+
+        private final byte cursor;
+
+        CursorType(byte cursor) {
+            this.cursor = cursor;
+        }
+
+        public byte getCursor() {
+            return cursor;
+        }
     }
 }

src/main/java/net/silentclient/client/utils/cursors/SystemCursors.java

@@ -0,0 +1,56 @@
+package net.silentclient.client.utils.cursors;
+
+import org.apache.logging.log4j.*;
+import org.lwjgl.LWJGLUtil;
+import org.lwjgl.input.Mouse;
+
+public class SystemCursors {
+    public static final byte ARROW = 0;
+    public static final byte IBEAM = 1;
+    public static final byte CROSSHAIR = 2;
+    public static final byte POINTING_HAND = 3;
+    public static final byte RESIZE_EW = 4;
+    public static final byte RESIZE_NS = 5;
+    public static final byte RESIZE_NWSE = 6;
+    public static final byte RESIZE_NESW = 7;
+    public static final byte ALL_CURSOR = 8;
+    public static final byte NOT_ALLOWED = 9;
+    public static final byte SIZE = size();
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static boolean supported = true;
+
+    static void markUnsupported() {
+        supported = false;
+    }
+
+    public static void setCursor(byte cursor) {
+        if (!supported)
+            return;
+
+        try {
+            if (cursor == ARROW) {
+                Mouse.setNativeCursor(null);
+                return;
+            }
+
+            if (cursor < 0 || cursor >= SIZE)
+                throw new IllegalArgumentException(Byte.toString(cursor));
+
+            if (LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_LINUX || LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_MACOSX)
+                X11SystemCursors.setCursor(cursor);
+            else if (LWJGLUtil.getPlatform() == LWJGLUtil.PLATFORM_WINDOWS)
+                Win32SystemCursors.setCursor(cursor);
+        } catch (Throwable error) {
+            LOGGER.error("Error occured; not trying again", error);
+            markUnsupported();
+        }
+    }
+
+    public static boolean isSupported() {
+        return supported;
+    }
+
+    private static byte size() {
+        return NOT_ALLOWED + 1;
+    }
+}

src/main/java/net/silentclient/client/utils/cursors/Util.java

@@ -0,0 +1,77 @@
+package net.silentclient.client.utils.cursors;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.lwjgl.input.Mouse;
+import org.lwjgl.opengl.Display;
+import org.lwjgl.opengl.InputImplementation;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UncheckedIOException;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+public class Util {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static MethodHandle getInputImplementationMethod;
+    private static MethodHandle getDisplayImplementationMethod;
+
+    static {
+        try {
+            Method getInputImplementation = Mouse.class.getDeclaredMethod("getImplementation");
+            getInputImplementation.setAccessible(true);
+            getInputImplementationMethod = MethodHandles.lookup().unreflect(getInputImplementation);
+
+            Method getDisplayImplementation = Display.class.getDeclaredMethod("getImplementation");
+            getDisplayImplementation.setAccessible(true);
+            getDisplayImplementationMethod = MethodHandles.lookup().unreflect(getDisplayImplementation);
+        } catch (Throwable error) {
+            LOGGER.error("Could not perform reflection", error);
+        }
+    }
+
+    public static RuntimeException sneakyThrow(Throwable error) {
+        if (error instanceof Error)
+            throw (Error) error;
+        if (error instanceof RuntimeException)
+            throw (RuntimeException) error;
+        if (error instanceof IOException)
+            throw new UncheckedIOException((IOException) error);
+
+        throw new IllegalStateException(error);
+    }
+
+    public static boolean foundInputImplementationMethod() {
+        return getInputImplementationMethod != null;
+    }
+
+    public static InputImplementation getInputImplementation() {
+        try {
+            return (InputImplementation) getInputImplementationMethod.invokeExact();
+        } catch (Throwable error) {
+            throw sneakyThrow(error);
+        }
+    }
+
+    public static Object getDisplayImplementation() {
+        try {
+            return getDisplayImplementationMethod.invoke();
+        } catch (Throwable error) {
+            throw sneakyThrow(error);
+        }
+    }
+
+    public static void loadLibrary(String name) throws IOException {
+        String resourceName = System.mapLibraryName(name);
+        File file = File.createTempFile(resourceName, "");
+        file.deleteOnExit();
+        try (InputStream in = Util.class.getResourceAsStream('/' + resourceName)) {
+            FileUtils.copyInputStreamToFile(in, file);
+        }
+        System.load(file.getAbsolutePath());
+    }
+}

src/main/java/net/silentclient/client/utils/cursors/Win32SystemCursors.java

@@ -0,0 +1,54 @@
+package net.silentclient.client.utils.cursors;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+public class Win32SystemCursors {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static final Long[] CACHE = new Long[SystemCursors.SIZE];
+    private static MethodHandle getHwndMethod;
+
+    static {
+        if (Util.foundInputImplementationMethod()) {
+            try {
+                Class<?> windowsDisplay = Class.forName("org.lwjgl.opengl.WindowsDisplay");
+                Method getHwnd = windowsDisplay.getDeclaredMethod("getHwnd");
+                getHwnd.setAccessible(true);
+                getHwndMethod = MethodHandles.lookup().unreflect(getHwnd);
+
+                Util.loadLibrary("lwjglLegacyCursorsWin32");
+            } catch (Throwable error) {
+                LOGGER.error("Could not perform reflection/load natives", error);
+                SystemCursors.markUnsupported();
+            }
+        } else
+            SystemCursors.markUnsupported();
+    }
+
+    public static void setCursor(byte cursor) {
+        nSetCursor(getHwnd(), getDefaultCursorHandle(cursor));
+    }
+
+    private static long getDefaultCursorHandle(byte cursor) {
+        if (CACHE[cursor] != null)
+            return CACHE[cursor];
+
+        return CACHE[cursor] = nGetDefaultCursorHandle(cursor);
+    }
+
+    private static long getHwnd() {
+        try {
+            return (long) getHwndMethod.invoke(Util.getDisplayImplementation());
+        } catch (Throwable error) {
+            throw Util.sneakyThrow(error);
+        }
+    }
+
+    private static native long nGetDefaultCursorHandle(byte cursor);
+
+    private static native void nSetCursor(long hwnd, long cursor);
+}

src/main/java/net/silentclient/client/utils/cursors/X11SystemCursors.java

@@ -0,0 +1,53 @@
+package net.silentclient.client.utils.cursors;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.lwjgl.LWJGLException;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+public class X11SystemCursors {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static final Long[] CACHE = new Long[SystemCursors.SIZE];
+    private static MethodHandle getDisplayMethod;
+
+    static {
+        if (Util.foundInputImplementationMethod()) {
+            try {
+                Class<?> linuxDisplay = Class.forName("org.lwjgl.opengl.LinuxDisplay");
+                Method getDisplay = linuxDisplay.getDeclaredMethod("getDisplay");
+                getDisplay.setAccessible(true);
+                getDisplayMethod = MethodHandles.lookup().unreflect(getDisplay);
+
+                Util.loadLibrary("lwjglLegacyCursorsX11");
+            } catch (Throwable error) {
+                LOGGER.error("Could not perform reflection/load natives", error);
+                SystemCursors.markUnsupported();
+            }
+        } else
+            SystemCursors.markUnsupported();
+    }
+
+    public static void setCursor(byte cursor) throws LWJGLException {
+        Util.getInputImplementation().setNativeCursor(getDefaultCursorHandle(cursor));
+    }
+
+    private static long getDefaultCursorHandle(byte cursor) {
+        if (CACHE[cursor] != null)
+            return CACHE[cursor];
+
+        return CACHE[cursor] = nGetDefaultCursorHandle(getDisplay(), cursor);
+    }
+
+    private static long getDisplay() {
+        try {
+            return (long) getDisplayMethod.invokeExact();
+        } catch (Throwable error) {
+            throw Util.sneakyThrow(error);
+        }
+    }
+
+    private static native long nGetDefaultCursorHandle(long display, byte cursor);
+}

src/main/resources/liblwjglLegacyCursorsX11.c

@@ -0,0 +1,23 @@
+#include <Xcursor/Xcursor.h>
+#include <jni.h>
+
+const char *LOOKUP[] = {
+	"default",
+	"text",
+	"crosshair",
+	"pointer",
+	"ew-resize",
+	"ns-resize",
+	"nwse-resize",
+	"nesw-resize",
+	"all-scroll",
+	"not-allowed"
+};
+
+JNIEXPORT jlong JNICALL Java_io_github_solclient_client_util_cursors_X11SystemCursors_nGetDefaultCursorHandle(
+		JNIEnv *env, jclass unused, jlong display, jbyte cursor) {
+	if (cursor < 0 || cursor >= sizeof(LOOKUP) / sizeof(*LOOKUP))
+		cursor = 0;
+
+	return XcursorLibraryLoadCursor((Display *) display, LOOKUP[cursor]);
+}

src/main/resources/lwjglLegacyCursorsWin32.c

@@ -0,0 +1,36 @@
+#include <windows.h>
+#include <winuser.h>
+#include <jni.h>
+
+JNIEXPORT jlong JNICALL Java_io_github_solclient_client_util_cursors_Win32SystemCursors_nGetDefaultCursorHandle(
+		JNIEnv *env, jclass unused, jbyte cursor) {
+	switch (cursor) {
+		case 0:
+		default:
+			return (jlong) LoadCursor(NULL, IDC_ARROW);
+		case 1:
+			return (jlong) LoadCursor(NULL, IDC_IBEAM);
+		case 2:
+			return (jlong) LoadCursor(NULL, IDC_CROSS);
+		case 3:
+			return (jlong) LoadCursor(NULL, IDC_HAND);
+		case 4:
+			return (jlong) LoadCursor(NULL, IDC_SIZEWE);
+		case 5:
+			return (jlong) LoadCursor(NULL, IDC_SIZENS);
+		case 6:
+			return (jlong) LoadCursor(NULL, IDC_SIZENWSE);
+		case 7:
+			return (jlong) LoadCursor(NULL, IDC_SIZENESW);
+		case 8:
+			return (jlong) LoadCursor(NULL, IDC_SIZEALL);
+		case 9:
+			return (jlong) LoadCursor(NULL, IDC_NO);
+	}
+}
+
+JNIEXPORT void JNICALL Java_io_github_solclient_client_util_cursors_Win32SystemCursors_nSetCursor(
+		JNIEnv *env, jclass unused, jlong hwnd, jlong cursor) {
+	SetClassLongPtr((HWND) hwnd, GCLP_HCURSOR, NULL);
+	SetCursor((HCURSOR) cursor);
+}