1 files changed, 131 insertions, 0 deletions
diff --git a/code/macosx/CGMouseDeltaFix.m b/code/macosx/CGMouseDeltaFix.m
new file mode 100755
index 0000000..ee83eeb
--- /dev/null
+++ b/code/macosx/CGMouseDeltaFix.m
@@ -0,0 +1,131 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake III Arena source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Foobar; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+#import "CGMouseDeltaFix.h"
+#import "CGPrivateAPI.h"
+
+#import <Foundation/Foundation.h>
+#import <mach-o/dyld.h>
+
+
+// We will try to automatically fall back to using the original CGGetLastMouseDelta when we are on a system new enough to have the fix.  Any version of CoreGraphics past 1.93.0 will have the fixed version.
+
+
+static BOOL originalVersionShouldWork = YES;
+static CGMouseDelta CGFix_Mouse_DeltaX, CGFix_Mouse_DeltaY;
+
+static void CGFix_NotificationCallback(CGSNotificationType note, CGSNotificationData data, CGSByteCount dataLength, CGSNotificationArg arg);
+
+static CGSRegisterNotifyProcType registerNotifyProc = NULL;
+
+void CGFix_Initialize()
+{
+    NSAutoreleasePool *pool;
+    NSBundle *cgBundle;
+    NSString *version;
+    NSArray *components;
+    
+    if (registerNotifyProc)
+        // We've already been called once and have registered our callbacks.  If the original version works, this will be NULL, but we'll end up doing nothing (again, possibly).
+        return;
+
+    //NSLog(@"CGFix_Initialize\n");
+        
+    pool = [[NSAutoreleasePool alloc] init];
+    cgBundle = [NSBundle bundleWithPath: @"/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework"];
+    if (!cgBundle) {
+        // If it's moved, it must be newer than what we know about and should work
+        //NSLog(@"No /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework\n");
+        goto done;
+    }
+    
+    version = [[cgBundle infoDictionary] objectForKey: @"CFBundleShortVersionString"];
+    components = [version componentsSeparatedByString: @"."];
+    //NSLog(@"version = %@\n", version);
+    //NSLog(@"components = %@\n", components);
+
+
+    if ([components count] < 2)
+        // We don't understand this versioning scheme.  Must have changed.
+        goto done;
+    
+    if (![[components objectAtIndex: 0] isEqualToString: @"1"] || [[components objectAtIndex: 1] intValue] > 93)
+        // This version should be new enough to work
+        goto done;
+    
+    // Look up the function pointer we need to register our callback.
+    if (!NSIsSymbolNameDefined("_CGSRegisterNotifyProc")) {
+        //NSLog(@"No _CGSRegisterNotifyProc\n");
+        goto done;
+    }
+    
+    registerNotifyProc = NSAddressOfSymbol(NSLookupAndBindSymbol("_CGSRegisterNotifyProc"));
+    //NSLog(@"registerNotifyProc = 0x%08x", registerNotifyProc);
+
+    // Must not work if we got here
+    originalVersionShouldWork = NO;
+    
+    // We want to catch all the events that could possible indicate mouse movement and sum them up
+    registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationMouseMoved, NULL);
+    registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationLeftMouseDragged, NULL);
+    registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationRightMouseDragged, NULL);
+    registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationNotificationOtherMouseDragged, NULL);
+    
+done:
+    [pool release];
+}
+
+void CGFix_GetLastMouseDelta(CGMouseDelta *dx, CGMouseDelta *dy)
+{
+    if (originalVersionShouldWork) {
+        CGGetLastMouseDelta(dx, dy);
+        return;
+    }
+    
+    *dx = CGFix_Mouse_DeltaX;
+    *dy = CGFix_Mouse_DeltaY;
+    
+    CGFix_Mouse_DeltaX = CGFix_Mouse_DeltaY = 0;
+}
+
+static void CGFix_NotificationCallback(CGSNotificationType note, CGSNotificationData data, CGSByteCount dataLength, CGSNotificationArg arg)
+{
+    CGSEventRecordPtr event;
+
+    //fprintf(stderr, "CGFix_NotificationCallback(note=%d, date=0x%08x, dataLength=%d, arg=0x%08x)\n", note, data, dataLength, arg);
+    
+#ifdef DEBUG
+    if ((note != kCGSEventNotificationMouseMoved && 
+         note != kCGSEventNotificationLeftMouseDragged &&
+         note != kCGSEventNotificationRightMouseDragged &&
+         note != kCGSEventNotificationNotificationOtherMouseDragged) ||
+         dataLength != sizeof (CGSEventRecord))
+         fprintf(stderr, "Unexpected arguments to callback function CGFix_NotificationCallback(note=%d, date=0x%08x, dataLength=%d, arg=0x%08x)\n", note, data, dataLength, arg);
+         abort();
+    }
+#endif
+
+    event = (CGSEventRecordPtr)data;
+
+    CGFix_Mouse_DeltaX += event->data.move.deltaX;
+    CGFix_Mouse_DeltaY += event->data.move.deltaY;
+    //fprintf(stderr, "  dx += %d, dy += %d\n", event->data.move.deltaX, event->data.move.deltaY);
+}