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/*
===========================================================================
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);
}
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