cocoa: Remove mouse event tap.

It doesn't appear to work anymore, and was disabled by default anyhow, since
the needed APIs are forbidden on the Mac App Store.

A better solution to lock the mouse to the window on macOS would still be
welcome. CGAssociateMouseAndMouseCursorPosition() works fine for relative
mouse mode, this was just a question of SDL_SetWindowGrab(). As it stands
now, a grabbed mouse can briefly break out of the window, causing varying
degrees of chaos.

Xcode/SDL/SDL.xcodeproj/project.pbxproj

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 				A7D8B26B23E2514200DCD162 /* vk_platform.h in Headers */,
 				A7D8AEB723E2514100DCD162 /* SDL_cocoametalview.h in Headers */,
 				A7D8AEF323E2514100DCD162 /* SDL_cocoaopengles.h in Headers */,
@@ -8181,7 +8150,6 @@
 				A75FCDFE23E25AB700529352 /* SDL_hidapi_xbox360w.c in Sources */,
 				A75FCDFF23E25AB700529352 /* SDL_atomic.c in Sources */,
 				A75FCE0023E25AB700529352 /* SDL_displayevents.c in Sources */,
-				A75FCE0123E25AB700529352 /* SDL_cocoamousetap.m in Sources */,
 				A75FCE0223E25AB700529352 /* SDL_log.c in Sources */,
 				A75FCE0323E25AB700529352 /* SDL_cocoaopengl.m in Sources */,
 				A75FCE0423E25AB700529352 /* SDL_offscreenframebuffer.c in Sources */,
@@ -8383,7 +8351,6 @@
 				A75FCFB723E25AC700529352 /* SDL_hidapi_xbox360w.c in Sources */,
 				A75FCFB823E25AC700529352 /* SDL_atomic.c in Sources */,
 				A75FCFB923E25AC700529352 /* SDL_displayevents.c in Sources */,
-				A75FCFBA23E25AC700529352 /* SDL_cocoamousetap.m in Sources */,
 				A75FCFBB23E25AC700529352 /* SDL_log.c in Sources */,
 				A75FCFBC23E25AC700529352 /* SDL_cocoaopengl.m in Sources */,
 				A75FCFBD23E25AC700529352 /* SDL_offscreenframebuffer.c in Sources */,
@@ -8606,7 +8573,6 @@
 				A769B18723E259AE00872273 /* SDL_hidapi_xbox360w.c in Sources */,
 				A769B18823E259AE00872273 /* SDL_atomic.c in Sources */,
 				A769B18923E259AE00872273 /* SDL_displayevents.c in Sources */,
-				A769B18A23E259AE00872273 /* SDL_cocoamousetap.m in Sources */,
 				A769B18B23E259AE00872273 /* SDL_log.c in Sources */,
 				A769B18C23E259AE00872273 /* SDL_cocoaopengl.m in Sources */,
 				A769B18D23E259AE00872273 /* SDL_offscreenframebuffer.c in Sources */,
@@ -8810,7 +8776,6 @@
 				A7D8B55E23E2514300DCD162 /* SDL_hidapi_xbox360w.c in Sources */,
 				A7D8A95823E2514000DCD162 /* SDL_atomic.c in Sources */,
 				A7D8BB2823E2514500DCD162 /* SDL_displayevents.c in Sources */,
-				A7D8AF1923E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2623E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8AE8923E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
 				A7D8AB7423E2514100DCD162 /* SDL_offscreenframebuffer.c in Sources */,
@@ -9012,7 +8977,6 @@
 				A7D8B55F23E2514300DCD162 /* SDL_hidapi_xbox360w.c in Sources */,
 				A7D8A95923E2514000DCD162 /* SDL_atomic.c in Sources */,
 				A7D8BB2923E2514500DCD162 /* SDL_displayevents.c in Sources */,
-				A7D8AF1A23E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2723E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8AE8A23E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
 				A7D8AB7523E2514100DCD162 /* SDL_offscreenframebuffer.c in Sources */,
@@ -9213,7 +9177,6 @@
 				A7D8B56123E2514300DCD162 /* SDL_hidapi_xbox360w.c in Sources */,
 				A7D8A95B23E2514000DCD162 /* SDL_atomic.c in Sources */,
 				A7D8BB2B23E2514500DCD162 /* SDL_displayevents.c in Sources */,
-				A7D8AF1C23E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2923E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8AE8C23E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
 				A7D8AB7723E2514100DCD162 /* SDL_offscreenframebuffer.c in Sources */,
@@ -9419,7 +9382,6 @@
 				A7D8A95723E2514000DCD162 /* SDL_atomic.c in Sources */,
 				A75FDBCE23EA380300529352 /* SDL_hidapi_rumble.c in Sources */,
 				A7D8BB2723E2514500DCD162 /* SDL_displayevents.c in Sources */,
-				A7D8AF1823E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2523E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8AE8823E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
 				A7D8AB7323E2514100DCD162 /* SDL_offscreenframebuffer.c in Sources */,
@@ -9621,7 +9583,6 @@
 				A75FDBD123EA380300529352 /* SDL_hidapi_rumble.c in Sources */,
 				A7D8BB2A23E2514500DCD162 /* SDL_displayevents.c in Sources */,
 				A7D8BBFC23E2574800DCD162 /* SDL_uikitopenglview.m in Sources */,
-				A7D8AF1B23E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2823E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8BC0223E2574800DCD162 /* SDL_uikitviewcontroller.m in Sources */,
 				A7D8AE8B23E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
@@ -9822,7 +9783,6 @@
 				A7D8A95C23E2514000DCD162 /* SDL_atomic.c in Sources */,
 				A75FDBD423EA380300529352 /* SDL_hidapi_rumble.c in Sources */,
 				A7D8BB2C23E2514500DCD162 /* SDL_displayevents.c in Sources */,
-				A7D8AF1D23E2514100DCD162 /* SDL_cocoamousetap.m in Sources */,
 				A7D8AB2A23E2514100DCD162 /* SDL_log.c in Sources */,
 				A7D8AE8D23E2514100DCD162 /* SDL_cocoaopengl.m in Sources */,
 				A7D8AB7823E2514100DCD162 /* SDL_offscreenframebuffer.c in Sources */,

src/video/cocoa/SDL_cocoamouse.h

@@ -40,7 +40,6 @@ typedef struct {
     /* What location we last saw the cursor move to. */
     CGFloat lastMoveX;
     CGFloat lastMoveY;
-    void *tapdata;
 } SDL_MouseData;
 
 @interface NSCursor (InvisibleCursor)

src/video/cocoa/SDL_cocoamouse.m

@@ -24,7 +24,6 @@
 
 #include "SDL_events.h"
 #include "SDL_cocoamouse.h"
-#include "SDL_cocoamousetap.h"
 #include "SDL_cocoavideo.h"
 
 #include "../../events/SDL_mouse_c.h"
@@ -348,8 +347,6 @@ Cocoa_InitMouse(_THIS)
 
     SDL_SetDefaultCursor(Cocoa_CreateDefaultCursor());
 
-    Cocoa_InitMouseEventTap(driverdata);
-
     const NSPoint location =  [NSEvent mouseLocation];
     driverdata->lastMoveX = location.x;
     driverdata->lastMoveY = location.y;
@@ -467,8 +464,6 @@ Cocoa_QuitMouse(_THIS)
     SDL_Mouse *mouse = SDL_GetMouse();
     if (mouse) {
         if (mouse->driverdata) {
-            Cocoa_QuitMouseEventTap(((SDL_MouseData*)mouse->driverdata));
-
             SDL_free(mouse->driverdata);
             mouse->driverdata = NULL;
         }

src/video/cocoa/SDL_cocoamousetap.h

@@ -1,34 +0,0 @@
-/*
-  Simple DirectMedia Layer
-  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-*/
-#include "../../SDL_internal.h"
-
-#ifndef SDL_cocoamousetap_h_
-#define SDL_cocoamousetap_h_
-
-#include "SDL_cocoamouse.h"
-
-extern void Cocoa_InitMouseEventTap(SDL_MouseData *driverdata);
-extern void Cocoa_EnableMouseEventTap(SDL_MouseData *driverdata, SDL_bool enabled);
-extern void Cocoa_QuitMouseEventTap(SDL_MouseData *driverdata);
-
-#endif /* SDL_cocoamousetap_h_ */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/video/cocoa/SDL_cocoamousetap.m

@@ -1,286 +0,0 @@
-/*
-  Simple DirectMedia Layer
-  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-*/
-#include "../../SDL_internal.h"
-
-#if SDL_VIDEO_DRIVER_COCOA
-
-#include "SDL_cocoamousetap.h"
-
-/* Event taps are forbidden in the Mac App Store, so we can only enable this
- * code if your app doesn't need to ship through the app store.
- * This code makes it so that a grabbed cursor cannot "leak" a mouse click
- * past the edge of the window if moving the cursor too fast.
- */
-#if SDL_MAC_NO_SANDBOX
-
-#include "SDL_keyboard.h"
-#include "SDL_cocoavideo.h"
-#include "../../thread/SDL_systhread.h"
-
-#include "../../events/SDL_mouse_c.h"
-
-typedef struct {
-    CFMachPortRef tap;
-    CFRunLoopRef runloop;
-    CFRunLoopSourceRef runloopSource;
-    SDL_Thread *thread;
-    SDL_sem *runloopStartedSemaphore;
-} SDL_MouseEventTapData;
-
-static const CGEventMask movementEventsMask =
-      CGEventMaskBit(kCGEventLeftMouseDragged)
-    | CGEventMaskBit(kCGEventRightMouseDragged)
-    | CGEventMaskBit(kCGEventMouseMoved);
-
-static const CGEventMask allGrabbedEventsMask =
-      CGEventMaskBit(kCGEventLeftMouseDown)    | CGEventMaskBit(kCGEventLeftMouseUp)
-    | CGEventMaskBit(kCGEventRightMouseDown)   | CGEventMaskBit(kCGEventRightMouseUp)
-    | CGEventMaskBit(kCGEventOtherMouseDown)   | CGEventMaskBit(kCGEventOtherMouseUp)
-    | CGEventMaskBit(kCGEventLeftMouseDragged) | CGEventMaskBit(kCGEventRightMouseDragged)
-    | CGEventMaskBit(kCGEventMouseMoved);
-
-static CGEventRef
-Cocoa_MouseTapCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon)
-{
-    SDL_MouseEventTapData *tapdata = (SDL_MouseEventTapData*)refcon;
-    SDL_Mouse *mouse = SDL_GetMouse();
-    SDL_Window *window = SDL_GetKeyboardFocus();
-    NSWindow *nswindow;
-    NSRect windowRect;
-    CGPoint eventLocation;
-
-    switch (type) {
-        case kCGEventTapDisabledByTimeout:
-            {
-                CGEventTapEnable(tapdata->tap, true);
-                return NULL;
-            }
-        case kCGEventTapDisabledByUserInput:
-            {
-                return NULL;
-            }
-        default:
-            break;
-    }
-
-
-    if (!window || !mouse) {
-        return event;
-    }
-
-    if (mouse->relative_mode) {
-        return event;
-    }
-
-    if (!(window->flags & SDL_WINDOW_MOUSE_GRABBED)) {
-        return event;
-    }
-
-    /* This is the same coordinate system as Cocoa uses. */
-    nswindow = ((SDL_WindowData *) window->driverdata)->nswindow;
-    eventLocation = CGEventGetUnflippedLocation(event);
-    windowRect = [nswindow contentRectForFrameRect:[nswindow frame]];
-
-    if (!NSMouseInRect(NSPointFromCGPoint(eventLocation), windowRect, NO)) {
-
-        /* This is in CGs global screenspace coordinate system, which has a
-         * flipped Y.
-         */
-        CGPoint newLocation = CGEventGetLocation(event);
-
-        if (eventLocation.x < NSMinX(windowRect)) {
-            newLocation.x = NSMinX(windowRect);
-        } else if (eventLocation.x >= NSMaxX(windowRect)) {
-            newLocation.x = NSMaxX(windowRect) - 1.0;
-        }
-
-        if (eventLocation.y <= NSMinY(windowRect)) {
-            newLocation.y -= (NSMinY(windowRect) - eventLocation.y + 1);
-        } else if (eventLocation.y > NSMaxY(windowRect)) {
-            newLocation.y += (eventLocation.y - NSMaxY(windowRect));
-        }
-
-        CGWarpMouseCursorPosition(newLocation);
-        CGAssociateMouseAndMouseCursorPosition(YES);
-
-        if ((CGEventMaskBit(type) & movementEventsMask) == 0) {
-            /* For click events, we just constrain the event to the window, so
-             * no other app receives the click event. We can't due the same to
-             * movement events, since they mean that our warp cursor above
-             * behaves strangely.
-             */
-            CGEventSetLocation(event, newLocation);
-        }
-    }
-
-    return event;
-}
-
-static void
-SemaphorePostCallback(CFRunLoopTimerRef timer, void *info)
-{
-    SDL_SemPost((SDL_sem*)info);
-}
-
-static int
-Cocoa_MouseTapThread(void *data)
-{
-    SDL_MouseEventTapData *tapdata = (SDL_MouseEventTapData*)data;
-
-    /* Tap was created on main thread but we own it now. */
-    CFMachPortRef eventTap = tapdata->tap;
-    if (eventTap) {
-        /* Try to create a runloop source we can schedule. */
-        CFRunLoopSourceRef runloopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
-        if  (runloopSource) {
-            tapdata->runloopSource = runloopSource;
-        } else {
-            CFRelease(eventTap);
-            SDL_SemPost(tapdata->runloopStartedSemaphore);
-            /* TODO: Both here and in the return below, set some state in
-             * tapdata to indicate that initialization failed, which we should
-             * check in InitMouseEventTap, after we move the semaphore check
-             * from Quit to Init.
-             */
-            return 1;
-        }
-    } else {
-        SDL_SemPost(tapdata->runloopStartedSemaphore);
-        return 1;
-    }
-
-    tapdata->runloop = CFRunLoopGetCurrent();
-    CFRunLoopAddSource(tapdata->runloop, tapdata->runloopSource, kCFRunLoopCommonModes);
-    CFRunLoopTimerContext context = {.info = tapdata->runloopStartedSemaphore};
-    /* We signal the runloop started semaphore *after* the run loop has started, indicating it's safe to CFRunLoopStop it. */
-    CFRunLoopTimerRef timer = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent(), 0, 0, 0, &SemaphorePostCallback, &context);
-    CFRunLoopAddTimer(tapdata->runloop, timer, kCFRunLoopCommonModes);
-    CFRelease(timer);
-
-    /* Run the event loop to handle events in the event tap. */
-    CFRunLoopRun();
-    /* Make sure this is signaled so that SDL_QuitMouseEventTap knows it can safely SDL_WaitThread for us. */
-    if (SDL_SemValue(tapdata->runloopStartedSemaphore) < 1) {
-        SDL_SemPost(tapdata->runloopStartedSemaphore);
-    }
-    CFRunLoopRemoveSource(tapdata->runloop, tapdata->runloopSource, kCFRunLoopCommonModes);
-
-    /* Clean up. */
-    CGEventTapEnable(tapdata->tap, false);
-    CFRelease(tapdata->runloopSource);
-    CFRelease(tapdata->tap);
-    tapdata->runloopSource = NULL;
-    tapdata->tap = NULL;
-
-    return 0;
-}
-
-void
-Cocoa_InitMouseEventTap(SDL_MouseData* driverdata)
-{
-    SDL_MouseEventTapData *tapdata;
-    driverdata->tapdata = SDL_calloc(1, sizeof(SDL_MouseEventTapData));
-    tapdata = (SDL_MouseEventTapData*)driverdata->tapdata;
-
-    tapdata->runloopStartedSemaphore = SDL_CreateSemaphore(0);
-    if (tapdata->runloopStartedSemaphore) {
-        tapdata->tap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap,
-                                        kCGEventTapOptionDefault, allGrabbedEventsMask,
-                                        &Cocoa_MouseTapCallback, tapdata);
-        if (tapdata->tap) {
-            /* Tap starts disabled, until app requests mouse grab */
-            CGEventTapEnable(tapdata->tap, false);
-            tapdata->thread = SDL_CreateThreadInternal(&Cocoa_MouseTapThread, "Event Tap Loop", 512 * 1024, tapdata);
-            if (tapdata->thread) {
-                /* Success - early out. Ownership transferred to thread. */
-                return;
-            }
-            CFRelease(tapdata->tap);
-        }
-        SDL_DestroySemaphore(tapdata->runloopStartedSemaphore);
-    }
-    SDL_free(driverdata->tapdata);
-    driverdata->tapdata = NULL;
-}
-
-void
-Cocoa_EnableMouseEventTap(SDL_MouseData *driverdata, SDL_bool enabled)
-{
-    SDL_MouseEventTapData *tapdata = (SDL_MouseEventTapData*)driverdata->tapdata;
-    if (tapdata && tapdata->tap)
-    {
-        CGEventTapEnable(tapdata->tap, !!enabled);
-    }
-}
-
-void
-Cocoa_QuitMouseEventTap(SDL_MouseData *driverdata)
-{
-    SDL_MouseEventTapData *tapdata = (SDL_MouseEventTapData*)driverdata->tapdata;
-    int status;
-
-    if (tapdata == NULL) {
-        /* event tap was already cleaned up (possibly due to CGEventTapCreate
-         * returning null.)
-         */
-        return;
-    }
-
-    /* Ensure that the runloop has been started first.
-     * TODO: Move this to InitMouseEventTap, check for error conditions that can
-     * happen in Cocoa_MouseTapThread, and fall back to the non-EventTap way of
-     * grabbing the mouse if it fails to Init.
-     */
-    status = SDL_SemWaitTimeout(tapdata->runloopStartedSemaphore, 5000);
-    if (status > -1) {
-        /* Then stop it, which will cause Cocoa_MouseTapThread to return. */
-        CFRunLoopStop(tapdata->runloop);
-        /* And then wait for Cocoa_MouseTapThread to finish cleaning up. It
-         * releases some of the pointers in tapdata. */
-        SDL_WaitThread(tapdata->thread, &status);
-    }
-
-    SDL_free(driverdata->tapdata);
-    driverdata->tapdata = NULL;
-}
-
-#else /* SDL_MAC_NO_SANDBOX */
-
-void
-Cocoa_InitMouseEventTap(SDL_MouseData *unused)
-{
-}
-
-void
-Cocoa_EnableMouseEventTap(SDL_MouseData *driverdata, SDL_bool enabled)
-{
-}
-
-void
-Cocoa_QuitMouseEventTap(SDL_MouseData *driverdata)
-{
-}
-
-#endif /* !SDL_MAC_NO_SANDBOX */
-
-#endif /* SDL_VIDEO_DRIVER_COCOA */
-
-/* vi: set ts=4 sw=4 expandtab: */

src/video/cocoa/SDL_cocoawindow.m

@@ -38,7 +38,6 @@
 #include "SDL_cocoavideo.h"
 #include "SDL_cocoashape.h"
 #include "SDL_cocoamouse.h"
-#include "SDL_cocoamousetap.h"
 #include "SDL_cocoaopengl.h"
 #include "SDL_cocoaopengles.h"
 
@@ -1122,13 +1121,7 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
                 y = window->h - 1;
             }
 
-#if !SDL_MAC_NO_SANDBOX
             CGPoint cgpoint;
-
-            /* When SDL_MAC_NO_SANDBOX is set, this is handled by
-             * SDL_cocoamousetap.m.
-             */
-
             cgpoint.x = window->x + x;
             cgpoint.y = window->y + y;
 
@@ -1136,7 +1129,6 @@ SetWindowStyle(SDL_Window * window, NSUInteger style)
             CGAssociateMouseAndMouseCursorPosition(YES);
 
             Cocoa_HandleMouseWarp(cgpoint.x, cgpoint.y);
-#endif
         }
     }
 
@@ -1972,12 +1964,8 @@ Cocoa_GetWindowGammaRamp(_THIS, SDL_Window * window, Uint16 * ramp)
 void
 Cocoa_SetWindowMouseGrab(_THIS, SDL_Window * window, SDL_bool grabbed)
 {
-    SDL_Mouse *mouse = SDL_GetMouse();
     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
 
-    /* Enable or disable the event tap as necessary */
-    Cocoa_EnableMouseEventTap(mouse->driverdata, grabbed);
-
     /* Move the cursor to the nearest point in the window */
     if (grabbed && data && ![data->listener isMoving]) {
         int x, y;