ui/cocoa.m

/*
 * QEMU Cocoa CG display driver
 *
 * Copyright (c) 2008 Mike Kronenberg
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"

#import <Cocoa/Cocoa.h>
#include <crt_externs.h>

#include "qemu-common.h"
#include "ui/clipboard.h"
#include "ui/console.h"
#include "ui/input.h"
#include "ui/kbd-state.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "sysemu/cpu-throttle.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-commands-misc.h"
#include "sysemu/blockdev.h"
#include "qemu-version.h"
#include "qemu/cutils.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include <Carbon/Carbon.h>
#include "hw/core/cpu.h"

#ifndef MAC_OS_X_VERSION_10_13
#define MAC_OS_X_VERSION_10_13 101300
#endif

/* 10.14 deprecates NSOnState and NSOffState in favor of
 * NSControlStateValueOn/Off, which were introduced in 10.13.
 * Define for older versions
 */
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
#define NSControlStateValueOn NSOnState
#define NSControlStateValueOff NSOffState
#endif

//#define DEBUG

#ifdef DEBUG
#define COCOA_DEBUG(...)  { (void) fprintf (stdout, __VA_ARGS__); }
#else
#define COCOA_DEBUG(...)  ((void) 0)
#endif

#define cgrect(nsrect) (*(CGRect *)&(nsrect))

typedef struct {
    int width;
    int height;
} QEMUScreen;

static void cocoa_update(DisplayChangeListener *dcl,
                         int x, int y, int w, int h);

static void cocoa_switch(DisplayChangeListener *dcl,
                         DisplaySurface *surface);

static void cocoa_refresh(DisplayChangeListener *dcl);

static NSWindow *normalWindow, *about_window;
static const DisplayChangeListenerOps dcl_ops = {
    .dpy_name          = "cocoa",
    .dpy_gfx_update = cocoa_update,
    .dpy_gfx_switch = cocoa_switch,
    .dpy_refresh = cocoa_refresh,
};
static DisplayChangeListener dcl = {
    .ops = &dcl_ops,
};
static int last_buttons;
static int cursor_hide = 1;

static int gArgc;
static char **gArgv;
static bool stretch_video;
static NSTextField *pauseLabel;

static QemuSemaphore display_init_sem;
static QemuSemaphore app_started_sem;
static bool allow_events;

static NSInteger cbchangecount = -1;
static QemuClipboardInfo *cbinfo;
static QemuEvent cbevent;

// Utility functions to run specified code block with iothread lock held
typedef void (^CodeBlock)(void);
typedef bool (^BoolCodeBlock)(void);

static void with_iothread_lock(CodeBlock block)
{
    bool locked = qemu_mutex_iothread_locked();
    if (!locked) {
        qemu_mutex_lock_iothread();
    }
    block();
    if (!locked) {
        qemu_mutex_unlock_iothread();
    }
}

static bool bool_with_iothread_lock(BoolCodeBlock block)
{
    bool locked = qemu_mutex_iothread_locked();
    bool val;

    if (!locked) {
        qemu_mutex_lock_iothread();
    }
    val = block();
    if (!locked) {
        qemu_mutex_unlock_iothread();
    }
    return val;
}

// Mac to QKeyCode conversion
static const int mac_to_qkeycode_map[] = {
    [kVK_ANSI_A] = Q_KEY_CODE_A,
    [kVK_ANSI_B] = Q_KEY_CODE_B,
    [kVK_ANSI_C] = Q_KEY_CODE_C,
    [kVK_ANSI_D] = Q_KEY_CODE_D,
    [kVK_ANSI_E] = Q_KEY_CODE_E,
    [kVK_ANSI_F] = Q_KEY_CODE_F,
    [kVK_ANSI_G] = Q_KEY_CODE_G,
    [kVK_ANSI_H] = Q_KEY_CODE_H,
    [kVK_ANSI_I] = Q_KEY_CODE_I,
    [kVK_ANSI_J] = Q_KEY_CODE_J,
    [kVK_ANSI_K] = Q_KEY_CODE_K,
    [kVK_ANSI_L] = Q_KEY_CODE_L,
    [kVK_ANSI_M] = Q_KEY_CODE_M,
    [kVK_ANSI_N] = Q_KEY_CODE_N,
    [kVK_ANSI_O] = Q_KEY_CODE_O,
    [kVK_ANSI_P] = Q_KEY_CODE_P,
    [kVK_ANSI_Q] = Q_KEY_CODE_Q,
    [kVK_ANSI_R] = Q_KEY_CODE_R,
    [kVK_ANSI_S] = Q_KEY_CODE_S,
    [kVK_ANSI_T] = Q_KEY_CODE_T,
    [kVK_ANSI_U] = Q_KEY_CODE_U,
    [kVK_ANSI_V] = Q_KEY_CODE_V,
    [kVK_ANSI_W] = Q_KEY_CODE_W,
    [kVK_ANSI_X] = Q_KEY_CODE_X,
    [kVK_ANSI_Y] = Q_KEY_CODE_Y,
    [kVK_ANSI_Z] = Q_KEY_CODE_Z,

    [kVK_ANSI_0] = Q_KEY_CODE_0,
    [kVK_ANSI_1] = Q_KEY_CODE_1,
    [kVK_ANSI_2] = Q_KEY_CODE_2,
    [kVK_ANSI_3] = Q_KEY_CODE_3,
    [kVK_ANSI_4] = Q_KEY_CODE_4,
    [kVK_ANSI_5] = Q_KEY_CODE_5,
    [kVK_ANSI_6] = Q_KEY_CODE_6,
    [kVK_ANSI_7] = Q_KEY_CODE_7,
    [kVK_ANSI_8] = Q_KEY_CODE_8,
    [kVK_ANSI_9] = Q_KEY_CODE_9,

    [kVK_ANSI_Grave] = Q_KEY_CODE_GRAVE_ACCENT,
    [kVK_ANSI_Minus] = Q_KEY_CODE_MINUS,
    [kVK_ANSI_Equal] = Q_KEY_CODE_EQUAL,
    [kVK_Delete] = Q_KEY_CODE_BACKSPACE,
    [kVK_CapsLock] = Q_KEY_CODE_CAPS_LOCK,
    [kVK_Tab] = Q_KEY_CODE_TAB,
    [kVK_Return] = Q_KEY_CODE_RET,
    [kVK_ANSI_LeftBracket] = Q_KEY_CODE_BRACKET_LEFT,
    [kVK_ANSI_RightBracket] = Q_KEY_CODE_BRACKET_RIGHT,
    [kVK_ANSI_Backslash] = Q_KEY_CODE_BACKSLASH,
    [kVK_ANSI_Semicolon] = Q_KEY_CODE_SEMICOLON,
    [kVK_ANSI_Quote] = Q_KEY_CODE_APOSTROPHE,
    [kVK_ANSI_Comma] = Q_KEY_CODE_COMMA,
    [kVK_ANSI_Period] = Q_KEY_CODE_DOT,
    [kVK_ANSI_Slash] = Q_KEY_CODE_SLASH,
    [kVK_Space] = Q_KEY_CODE_SPC,

    [kVK_ANSI_Keypad0] = Q_KEY_CODE_KP_0,
    [kVK_ANSI_Keypad1] = Q_KEY_CODE_KP_1,
    [kVK_ANSI_Keypad2] = Q_KEY_CODE_KP_2,
    [kVK_ANSI_Keypad3] = Q_KEY_CODE_KP_3,
    [kVK_ANSI_Keypad4] = Q_KEY_CODE_KP_4,
    [kVK_ANSI_Keypad5] = Q_KEY_CODE_KP_5,
    [kVK_ANSI_Keypad6] = Q_KEY_CODE_KP_6,
    [kVK_ANSI_Keypad7] = Q_KEY_CODE_KP_7,
    [kVK_ANSI_Keypad8] = Q_KEY_CODE_KP_8,
    [kVK_ANSI_Keypad9] = Q_KEY_CODE_KP_9,
    [kVK_ANSI_KeypadDecimal] = Q_KEY_CODE_KP_DECIMAL,
    [kVK_ANSI_KeypadEnter] = Q_KEY_CODE_KP_ENTER,
    [kVK_ANSI_KeypadPlus] = Q_KEY_CODE_KP_ADD,
    [kVK_ANSI_KeypadMinus] = Q_KEY_CODE_KP_SUBTRACT,
    [kVK_ANSI_KeypadMultiply] = Q_KEY_CODE_KP_MULTIPLY,
    [kVK_ANSI_KeypadDivide] = Q_KEY_CODE_KP_DIVIDE,
    [kVK_ANSI_KeypadEquals] = Q_KEY_CODE_KP_EQUALS,
    [kVK_ANSI_KeypadClear] = Q_KEY_CODE_NUM_LOCK,

    [kVK_UpArrow] = Q_KEY_CODE_UP,
    [kVK_DownArrow] = Q_KEY_CODE_DOWN,
    [kVK_LeftArrow] = Q_KEY_CODE_LEFT,
    [kVK_RightArrow] = Q_KEY_CODE_RIGHT,

    [kVK_Help] = Q_KEY_CODE_INSERT,
    [kVK_Home] = Q_KEY_CODE_HOME,
    [kVK_PageUp] = Q_KEY_CODE_PGUP,
    [kVK_PageDown] = Q_KEY_CODE_PGDN,
    [kVK_End] = Q_KEY_CODE_END,
    [kVK_ForwardDelete] = Q_KEY_CODE_DELETE,

    [kVK_Escape] = Q_KEY_CODE_ESC,

    /* The Power key can't be used directly because the operating system uses
     * it. This key can be emulated by using it in place of another key such as
     * F1. Don't forget to disable the real key binding.
     */
    /* [kVK_F1] = Q_KEY_CODE_POWER, */

    [kVK_F1] = Q_KEY_CODE_F1,
    [kVK_F2] = Q_KEY_CODE_F2,
    [kVK_F3] = Q_KEY_CODE_F3,
    [kVK_F4] = Q_KEY_CODE_F4,
    [kVK_F5] = Q_KEY_CODE_F5,
    [kVK_F6] = Q_KEY_CODE_F6,
    [kVK_F7] = Q_KEY_CODE_F7,
    [kVK_F8] = Q_KEY_CODE_F8,
    [kVK_F9] = Q_KEY_CODE_F9,
    [kVK_F10] = Q_KEY_CODE_F10,
    [kVK_F11] = Q_KEY_CODE_F11,
    [kVK_F12] = Q_KEY_CODE_F12,
    [kVK_F13] = Q_KEY_CODE_PRINT,
    [kVK_F14] = Q_KEY_CODE_SCROLL_LOCK,
    [kVK_F15] = Q_KEY_CODE_PAUSE,

    // JIS keyboards only
    [kVK_JIS_Yen] = Q_KEY_CODE_YEN,
    [kVK_JIS_Underscore] = Q_KEY_CODE_RO,
    [kVK_JIS_KeypadComma] = Q_KEY_CODE_KP_COMMA,
    [kVK_JIS_Eisu] = Q_KEY_CODE_MUHENKAN,
    [kVK_JIS_Kana] = Q_KEY_CODE_HENKAN,

    /*
     * The eject and volume keys can't be used here because they are handled at
     * a lower level than what an Application can see.
     */
};

static int cocoa_keycode_to_qemu(int keycode)
{
    if (ARRAY_SIZE(mac_to_qkeycode_map) <= keycode) {
        error_report("(cocoa) warning unknown keycode 0x%x", keycode);
        return 0;
    }
    return mac_to_qkeycode_map[keycode];
}

/* Displays an alert dialog box with the specified message */
static void QEMU_Alert(NSString *message)
{
    NSAlert *alert;
    alert = [NSAlert new];
    [alert setMessageText: message];
    [alert runModal];
}

/* Handles any errors that happen with a device transaction */
static void handleAnyDeviceErrors(Error * err)
{
    if (err) {
        QEMU_Alert([NSString stringWithCString: error_get_pretty(err)
                                      encoding: NSASCIIStringEncoding]);
        error_free(err);
    }
}

/*
 ------------------------------------------------------
    QemuCocoaView
 ------------------------------------------------------
*/
@interface QemuCocoaView : NSView
{
    QEMUScreen screen;
    NSWindow *fullScreenWindow;
    float cx,cy,cw,ch,cdx,cdy;
    pixman_image_t *pixman_image;
    QKbdState *kbd;
    BOOL isMouseGrabbed;
    BOOL isFullscreen;
    BOOL isAbsoluteEnabled;
}
- (void) switchSurface:(pixman_image_t *)image;
- (void) grabMouse;
- (void) ungrabMouse;
- (void) toggleFullScreen:(id)sender;
- (void) handleMonitorInput:(NSEvent *)event;
- (bool) handleEvent:(NSEvent *)event;
- (bool) handleEventLocked:(NSEvent *)event;
- (void) setAbsoluteEnabled:(BOOL)tIsAbsoluteEnabled;
/* The state surrounding mouse grabbing is potentially confusing.
 * isAbsoluteEnabled tracks qemu_input_is_absolute() [ie "is the emulated
 *   pointing device an absolute-position one?"], but is only updated on
 *   next refresh.
 * isMouseGrabbed tracks whether GUI events are directed to the guest;
 *   it controls whether special keys like Cmd get sent to the guest,
 *   and whether we capture the mouse when in non-absolute mode.
 */
- (BOOL) isMouseGrabbed;
- (BOOL) isAbsoluteEnabled;
- (float) cdx;
- (float) cdy;
- (QEMUScreen) gscreen;
- (void) raiseAllKeys;
@end

QemuCocoaView *cocoaView;

@implementation QemuCocoaView
- (id)initWithFrame:(NSRect)frameRect
{
    COCOA_DEBUG("QemuCocoaView: initWithFrame\n");

    self = [super initWithFrame:frameRect];
    if (self) {

        screen.width = frameRect.size.width;
        screen.height = frameRect.size.height;
        kbd = qkbd_state_init(dcl.con);

    }
    return self;
}

- (void) dealloc
{
    COCOA_DEBUG("QemuCocoaView: dealloc\n");

    if (pixman_image) {
        pixman_image_unref(pixman_image);
    }

    qkbd_state_free(kbd);
    [super dealloc];
}

- (BOOL) isOpaque
{
    return YES;
}

- (BOOL) screenContainsPoint:(NSPoint) p
{
    return (p.x > -1 && p.x < screen.width && p.y > -1 && p.y < screen.height);
}

/* Get location of event and convert to virtual screen coordinate */
- (CGPoint) screenLocationOfEvent:(NSEvent *)ev
{
    NSWindow *eventWindow = [ev window];
    // XXX: Use CGRect and -convertRectFromScreen: to support macOS 10.10
    CGRect r = CGRectZero;
    r.origin = [ev locationInWindow];
    if (!eventWindow) {
        if (!isFullscreen) {
            return [[self window] convertRectFromScreen:r].origin;
        } else {
            CGPoint locationInSelfWindow = [[self window] convertRectFromScreen:r].origin;
            CGPoint loc = [self convertPoint:locationInSelfWindow fromView:nil];
            if (stretch_video) {
                loc.x /= cdx;
                loc.y /= cdy;
            }
            return loc;
        }
    } else if ([[self window] isEqual:eventWindow]) {
        if (!isFullscreen) {
            return r.origin;
        } else {
            CGPoint loc = [self convertPoint:r.origin fromView:nil];
            if (stretch_video) {
                loc.x /= cdx;
                loc.y /= cdy;
            }
            return loc;
        }
    } else {
        return [[self window] convertRectFromScreen:[eventWindow convertRectToScreen:r]].origin;
    }
}

- (void) hideCursor
{
    if (!cursor_hide) {
        return;
    }
    [NSCursor hide];
}

- (void) unhideCursor
{
    if (!cursor_hide) {
        return;
    }
    [NSCursor unhide];
}

- (void) drawRect:(NSRect) rect
{
    COCOA_DEBUG("QemuCocoaView: drawRect\n");

    // get CoreGraphic context
    CGContextRef viewContextRef = [[NSGraphicsContext currentContext] CGContext];

    CGContextSetInterpolationQuality (viewContextRef, kCGInterpolationNone);
    CGContextSetShouldAntialias (viewContextRef, NO);

    // draw screen bitmap directly to Core Graphics context
    if (!pixman_image) {
        // Draw request before any guest device has set up a framebuffer:
        // just draw an opaque black rectangle
        CGContextSetRGBFillColor(viewContextRef, 0, 0, 0, 1.0);
        CGContextFillRect(viewContextRef, NSRectToCGRect(rect));
    } else {
        int w = pixman_image_get_width(pixman_image);
        int h = pixman_image_get_height(pixman_image);
        int bitsPerPixel = PIXMAN_FORMAT_BPP(pixman_image_get_format(pixman_image));
        int stride = pixman_image_get_stride(pixman_image);
        CGDataProviderRef dataProviderRef = CGDataProviderCreateWithData(
            NULL,
            pixman_image_get_data(pixman_image),
            stride * h,
            NULL
        );
        CGImageRef imageRef = CGImageCreate(
            w, //width
            h, //height
            DIV_ROUND_UP(bitsPerPixel, 8) * 2, //bitsPerComponent
            bitsPerPixel, //bitsPerPixel
            stride, //bytesPerRow
            CGColorSpaceCreateWithName(kCGColorSpaceSRGB), //colorspace
            kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst, //bitmapInfo
            dataProviderRef, //provider
            NULL, //decode
            0, //interpolate
            kCGRenderingIntentDefault //intent
        );
        // selective drawing code (draws only dirty rectangles) (OS X >= 10.4)
        const NSRect *rectList;
        NSInteger rectCount;
        int i;
        CGImageRef clipImageRef;
        CGRect clipRect;

        [self getRectsBeingDrawn:&rectList count:&rectCount];
        for (i = 0; i < rectCount; i++) {
            clipRect.origin.x = rectList[i].origin.x / cdx;
            clipRect.origin.y = (float)h - (rectList[i].origin.y + rectList[i].size.height) / cdy;
            clipRect.size.width = rectList[i].size.width / cdx;
            clipRect.size.height = rectList[i].size.height / cdy;
            clipImageRef = CGImageCreateWithImageInRect(
                                                        imageRef,
                                                        clipRect
                                                        );
            CGContextDrawImage (viewContextRef, cgrect(rectList[i]), clipImageRef);
            CGImageRelease (clipImageRef);
        }
        CGImageRelease (imageRef);
        CGDataProviderRelease(dataProviderRef);
    }
}

- (void) setContentDimensions
{
    COCOA_DEBUG("QemuCocoaView: setContentDimensions\n");

    if (isFullscreen) {
        cdx = [[NSScreen mainScreen] frame].size.width / (float)screen.width;
        cdy = [[NSScreen mainScreen] frame].size.height / (float)screen.height;

        /* stretches video, but keeps same aspect ratio */
        if (stretch_video == true) {
            /* use smallest stretch value - prevents clipping on sides */
            if (MIN(cdx, cdy) == cdx) {
                cdy = cdx;
            } else {
                cdx = cdy;
            }
        } else {  /* No stretching */
            cdx = cdy = 1;
        }
        cw = screen.width * cdx;
        ch = screen.height * cdy;
        cx = ([[NSScreen mainScreen] frame].size.width - cw) / 2.0;
        cy = ([[NSScreen mainScreen] frame].size.height - ch) / 2.0;
    } else {
        cx = 0;
        cy = 0;
        cw = screen.width;
        ch = screen.height;
        cdx = 1.0;
        cdy = 1.0;
    }
}

- (void) updateUIInfoLocked
{
    /* Must be called with the iothread lock, i.e. via updateUIInfo */
    NSSize frameSize;
    QemuUIInfo info;

    if (!qemu_console_is_graphic(dcl.con)) {
        return;
    }

    if ([self window]) {
        NSDictionary *description = [[[self window] screen] deviceDescription];
        CGDirectDisplayID display = [[description objectForKey:@"NSScreenNumber"] unsignedIntValue];
        NSSize screenSize = [[[self window] screen] frame].size;
        CGSize screenPhysicalSize = CGDisplayScreenSize(display);

        frameSize = isFullscreen ? screenSize : [self frame].size;
        info.width_mm = frameSize.width / screenSize.width * screenPhysicalSize.width;
        info.height_mm = frameSize.height / screenSize.height * screenPhysicalSize.height;
    } else {
        frameSize = [self frame].size;
        info.width_mm = 0;
        info.height_mm = 0;
    }

    info.xoff = 0;
    info.yoff = 0;
    info.width = frameSize.width;
    info.height = frameSize.height;

    dpy_set_ui_info(dcl.con, &info, TRUE);
}

- (void) updateUIInfo
{
    if (!allow_events) {
        /*
         * Don't try to tell QEMU about UI information in the application
         * startup phase -- we haven't yet registered dcl with the QEMU UI
         * layer, and also trying to take the iothread lock would deadlock.
         * When cocoa_display_init() does register the dcl, the UI layer
         * will call cocoa_switch(), which will call updateUIInfo, so
         * we don't lose any information here.
         */
        return;
    }

    with_iothread_lock(^{
        [self updateUIInfoLocked];
    });
}

- (void)viewDidMoveToWindow
{
    [self updateUIInfo];
}

- (void) switchSurface:(pixman_image_t *)image
{
    COCOA_DEBUG("QemuCocoaView: switchSurface\n");

    int w = pixman_image_get_width(image);
    int h = pixman_image_get_height(image);
    /* cdx == 0 means this is our very first surface, in which case we need
     * to recalculate the content dimensions even if it happens to be the size
     * of the initial empty window.
     */
    bool isResize = (w != screen.width || h != screen.height || cdx == 0.0);

    int oldh = screen.height;
    if (isResize) {
        // Resize before we trigger the redraw, or we'll redraw at the wrong size
        COCOA_DEBUG("switchSurface: new size %d x %d\n", w, h);
        screen.width = w;
        screen.height = h;
        [self setContentDimensions];
        [self setFrame:NSMakeRect(cx, cy, cw, ch)];
    }

    // update screenBuffer
    if (pixman_image) {
        pixman_image_unref(pixman_image);
    }

    pixman_image = image;

    // update windows
    if (isFullscreen) {
        [[fullScreenWindow contentView] setFrame:[[NSScreen mainScreen] frame]];
        [normalWindow setFrame:NSMakeRect([normalWindow frame].origin.x, [normalWindow frame].origin.y - h + oldh, w, h + [normalWindow frame].size.height - oldh) display:NO animate:NO];
    } else {
        if (qemu_name)
            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s", qemu_name]];
        [normalWindow setFrame:NSMakeRect([normalWindow frame].origin.x, [normalWindow frame].origin.y - h + oldh, w, h + [normalWindow frame].size.height - oldh) display:YES animate:NO];
    }

    if (isResize) {
        [normalWindow center];
    }
}

- (void) toggleFullScreen:(id)sender
{
    COCOA_DEBUG("QemuCocoaView: toggleFullScreen\n");

    if (isFullscreen) { // switch from fullscreen to desktop
        isFullscreen = FALSE;
        [self ungrabMouse];
        [self setContentDimensions];
        [fullScreenWindow close];
        [normalWindow setContentView: self];
        [normalWindow makeKeyAndOrderFront: self];
        [NSMenu setMenuBarVisible:YES];
    } else { // switch from desktop to fullscreen
        isFullscreen = TRUE;
        [normalWindow orderOut: nil]; /* Hide the window */
        [self grabMouse];
        [self setContentDimensions];
        [NSMenu setMenuBarVisible:NO];
        fullScreenWindow = [[NSWindow alloc] initWithContentRect:[[NSScreen mainScreen] frame]
            styleMask:NSWindowStyleMaskBorderless
            backing:NSBackingStoreBuffered
            defer:NO];
        [fullScreenWindow setAcceptsMouseMovedEvents: YES];
        [fullScreenWindow setHasShadow:NO];
        [fullScreenWindow setBackgroundColor: [NSColor blackColor]];
        [self setFrame:NSMakeRect(cx, cy, cw, ch)];
        [[fullScreenWindow contentView] addSubview: self];
        [fullScreenWindow makeKeyAndOrderFront:self];
    }
}

- (void) toggleKey: (int)keycode {
    qkbd_state_key_event(kbd, keycode, !qkbd_state_key_get(kbd, keycode));
}

// Does the work of sending input to the monitor
- (void) handleMonitorInput:(NSEvent *)event
{
    int keysym = 0;
    int control_key = 0;

    // if the control key is down
    if ([event modifierFlags] & NSEventModifierFlagControl) {
        control_key = 1;
    }

    /* translates Macintosh keycodes to QEMU's keysym */

    int without_control_translation[] = {
        [0 ... 0xff] = 0,   // invalid key

        [kVK_UpArrow]       = QEMU_KEY_UP,
        [kVK_DownArrow]     = QEMU_KEY_DOWN,
        [kVK_RightArrow]    = QEMU_KEY_RIGHT,
        [kVK_LeftArrow]     = QEMU_KEY_LEFT,
        [kVK_Home]          = QEMU_KEY_HOME,
        [kVK_End]           = QEMU_KEY_END,
        [kVK_PageUp]        = QEMU_KEY_PAGEUP,
        [kVK_PageDown]      = QEMU_KEY_PAGEDOWN,
        [kVK_ForwardDelete] = QEMU_KEY_DELETE,
        [kVK_Delete]        = QEMU_KEY_BACKSPACE,
    };

    int with_control_translation[] = {
        [0 ... 0xff] = 0,   // invalid key

        [kVK_UpArrow]       = QEMU_KEY_CTRL_UP,
        [kVK_DownArrow]     = QEMU_KEY_CTRL_DOWN,
        [kVK_RightArrow]    = QEMU_KEY_CTRL_RIGHT,
        [kVK_LeftArrow]     = QEMU_KEY_CTRL_LEFT,
        [kVK_Home]          = QEMU_KEY_CTRL_HOME,
        [kVK_End]           = QEMU_KEY_CTRL_END,
        [kVK_PageUp]        = QEMU_KEY_CTRL_PAGEUP,
        [kVK_PageDown]      = QEMU_KEY_CTRL_PAGEDOWN,
    };

    if (control_key != 0) { /* If the control key is being used */
        if ([event keyCode] < ARRAY_SIZE(with_control_translation)) {
            keysym = with_control_translation[[event keyCode]];
        }
    } else {
        if ([event keyCode] < ARRAY_SIZE(without_control_translation)) {
            keysym = without_control_translation[[event keyCode]];
        }
    }

    // if not a key that needs translating
    if (keysym == 0) {
        NSString *ks = [event characters];
        if ([ks length] > 0) {
            keysym = [ks characterAtIndex:0];
        }
    }

    if (keysym) {
        kbd_put_keysym(keysym);
    }
}

- (bool) handleEvent:(NSEvent *)event
{
    if(!allow_events) {
        /*
         * Just let OSX have all events that arrive before
         * applicationDidFinishLaunching.
         * This avoids a deadlock on the iothread lock, which cocoa_display_init()
         * will not drop until after the app_started_sem is posted. (In theory
         * there should not be any such events, but OSX Catalina now emits some.)
         */
        return false;
    }
    return bool_with_iothread_lock(^{
        return [self handleEventLocked:event];
    });
}

- (bool) handleEventLocked:(NSEvent *)event
{
    /* Return true if we handled the event, false if it should be given to OSX */
    COCOA_DEBUG("QemuCocoaView: handleEvent\n");
    int buttons = 0;
    int keycode = 0;
    bool mouse_event = false;
    static bool switched_to_fullscreen = false;
    // Location of event in virtual screen coordinates
    NSPoint p = [self screenLocationOfEvent:event];
    NSUInteger modifiers = [event modifierFlags];

    /*
     * Check -[NSEvent modifierFlags] here.
     *
     * There is a NSEventType for an event notifying the change of
     * -[NSEvent modifierFlags], NSEventTypeFlagsChanged but these operations
     * are performed for any events because a modifier state may change while
     * the application is inactive (i.e. no events fire) and we don't want to
     * wait for another modifier state change to detect such a change.
     *
     * NSEventModifierFlagCapsLock requires a special treatment. The other flags
     * are handled in similar manners.
     *
     * NSEventModifierFlagCapsLock
     * ---------------------------
     *
     * If CapsLock state is changed, "up" and "down" events will be fired in
     * sequence, effectively updates CapsLock state on the guest.
     *
     * The other flags
     * ---------------
     *
     * If a flag is not set, fire "up" events for all keys which correspond to
     * the flag. Note that "down" events are not fired here because the flags
     * checked here do not tell what exact keys are down.
     *
     * If one of the keys corresponding to a flag is down, we rely on
     * -[NSEvent keyCode] of an event whose -[NSEvent type] is
     * NSEventTypeFlagsChanged to know the exact key which is down, which has
     * the following two downsides:
     * - It does not work when the application is inactive as described above.
     * - It malfactions *after* the modifier state is changed while the
     *   application is inactive. It is because -[NSEvent keyCode] does not tell
     *   if the key is up or down, and requires to infer the current state from
     *   the previous state. It is still possible to fix such a malfanction by
     *   completely leaving your hands from the keyboard, which hopefully makes
     *   this implementation usable enough.
     */
    if (!!(modifiers & NSEventModifierFlagCapsLock) !=
        qkbd_state_modifier_get(kbd, QKBD_MOD_CAPSLOCK)) {
        qkbd_state_key_event(kbd, Q_KEY_CODE_CAPS_LOCK, true);
        qkbd_state_key_event(kbd, Q_KEY_CODE_CAPS_LOCK, false);
    }

    if (!(modifiers & NSEventModifierFlagShift)) {
        qkbd_state_key_event(kbd, Q_KEY_CODE_SHIFT, false);
        qkbd_state_key_event(kbd, Q_KEY_CODE_SHIFT_R, false);
    }
    if (!(modifiers & NSEventModifierFlagControl)) {
        qkbd_state_key_event(kbd, Q_KEY_CODE_CTRL, false);
        qkbd_state_key_event(kbd, Q_KEY_CODE_CTRL_R, false);
    }
    if (!(modifiers & NSEventModifierFlagOption)) {
        qkbd_state_key_event(kbd, Q_KEY_CODE_ALT, false);
        qkbd_state_key_event(kbd, Q_KEY_CODE_ALT_R, false);
    }
    if (!(modifiers & NSEventModifierFlagCommand)) {
        qkbd_state_key_event(kbd, Q_KEY_CODE_META_L, false);
        qkbd_state_key_event(kbd, Q_KEY_CODE_META_R, false);
    }

    switch ([event type]) {
        case NSEventTypeFlagsChanged:
            switch ([event keyCode]) {
                case kVK_Shift:
                    if (!!(modifiers & NSEventModifierFlagShift)) {
                        [self toggleKey:Q_KEY_CODE_SHIFT];
                    }
                    break;

                case kVK_RightShift:
                    if (!!(modifiers & NSEventModifierFlagShift)) {
                        [self toggleKey:Q_KEY_CODE_SHIFT_R];
                    }
                    break;

                case kVK_Control:
                    if (!!(modifiers & NSEventModifierFlagControl)) {
                        [self toggleKey:Q_KEY_CODE_CTRL];
                    }
                    break;

                case kVK_RightControl:
                    if (!!(modifiers & NSEventModifierFlagControl)) {
                        [self toggleKey:Q_KEY_CODE_CTRL_R];
                    }
                    break;

                case kVK_Option:
                    if (!!(modifiers & NSEventModifierFlagOption)) {
                        [self toggleKey:Q_KEY_CODE_ALT];
                    }
                    break;

                case kVK_RightOption:
                    if (!!(modifiers & NSEventModifierFlagOption)) {
                        [self toggleKey:Q_KEY_CODE_ALT_R];
                    }
                    break;

                /* Don't pass command key changes to guest unless mouse is grabbed */
                case kVK_Command:
                    if (isMouseGrabbed &&
                        !!(modifiers & NSEventModifierFlagCommand)) {
                        [self toggleKey:Q_KEY_CODE_META_L];
                    }
                    break;

                case kVK_RightCommand:
                    if (isMouseGrabbed &&
                        !!(modifiers & NSEventModifierFlagCommand)) {
                        [self toggleKey:Q_KEY_CODE_META_R];
                    }
                    break;
            }
            break;
        case NSEventTypeKeyDown:
            keycode = cocoa_keycode_to_qemu([event keyCode]);

            // forward command key combos to the host UI unless the mouse is grabbed
            if (!isMouseGrabbed && ([event modifierFlags] & NSEventModifierFlagCommand)) {
                /*
                 * Prevent the command key from being stuck down in the guest
                 * when using Command-F to switch to full screen mode.
                 */
                if (keycode == Q_KEY_CODE_F) {
                    switched_to_fullscreen = true;
                }
                return false;
            }

            // default

            // handle control + alt Key Combos (ctrl+alt+[1..9,g] is reserved for QEMU)
            if (([event modifierFlags] & NSEventModifierFlagControl) && ([event modifierFlags] & NSEventModifierFlagOption)) {
                NSString *keychar = [event charactersIgnoringModifiers];
                if ([keychar length] == 1) {
                    char key = [keychar characterAtIndex:0];
                    switch (key) {

                        // enable graphic console
                        case '1' ... '9':
                            console_select(key - '0' - 1); /* ascii math */
                            return true;

                        // release the mouse grab
                        case 'g':
                            [self ungrabMouse];
                            return true;
                    }
                }
            }

            if (qemu_console_is_graphic(NULL)) {
                qkbd_state_key_event(kbd, keycode, true);
            } else {
                [self handleMonitorInput: event];
            }
            break;
        case NSEventTypeKeyUp:
            keycode = cocoa_keycode_to_qemu([event keyCode]);

            // don't pass the guest a spurious key-up if we treated this
            // command-key combo as a host UI action
            if (!isMouseGrabbed && ([event modifierFlags] & NSEventModifierFlagCommand)) {
                return true;
            }

            if (qemu_console_is_graphic(NULL)) {
                qkbd_state_key_event(kbd, keycode, false);
            }
            break;
        case NSEventTypeMouseMoved:
            if (isAbsoluteEnabled) {
                // Cursor re-entered into a window might generate events bound to screen coordinates
                // and `nil` window property, and in full screen mode, current window might not be
                // key window, where event location alone should suffice.
                if (![self screenContainsPoint:p] || !([[self window] isKeyWindow] || isFullscreen)) {
                    if (isMouseGrabbed) {
                        [self ungrabMouse];
                    }
                } else {
                    if (!isMouseGrabbed) {
                        [self grabMouse];
                    }
                }
            }
            mouse_event = true;
            break;
        case NSEventTypeLeftMouseDown:
            buttons |= MOUSE_EVENT_LBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeRightMouseDown:
            buttons |= MOUSE_EVENT_RBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeOtherMouseDown:
            buttons |= MOUSE_EVENT_MBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeLeftMouseDragged:
            buttons |= MOUSE_EVENT_LBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeRightMouseDragged:
            buttons |= MOUSE_EVENT_RBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeOtherMouseDragged:
            buttons |= MOUSE_EVENT_MBUTTON;
            mouse_event = true;
            break;
        case NSEventTypeLeftMouseUp:
            mouse_event = true;
            if (!isMouseGrabbed && [self screenContainsPoint:p]) {
                /*
                 * In fullscreen mode, the window of cocoaView may not be the
                 * key window, therefore the position relative to the virtual
                 * screen alone will be sufficient.
                 */
                if(isFullscreen || [[self window] isKeyWindow]) {
                    [self grabMouse];
                }
            }
            break;
        case NSEventTypeRightMouseUp:
            mouse_event = true;
            break;
        case NSEventTypeOtherMouseUp:
            mouse_event = true;
            break;
        case NSEventTypeScrollWheel:
            /*
             * Send wheel events to the guest regardless of window focus.
             * This is in-line with standard Mac OS X UI behaviour.
             */

            /*
             * We shouldn't have got a scroll event when deltaY and delta Y
             * are zero, hence no harm in dropping the event
             */
            if ([event deltaY] != 0 || [event deltaX] != 0) {
            /* Determine if this is a scroll up or scroll down event */
                if ([event deltaY] != 0) {
                  buttons = ([event deltaY] > 0) ?
                    INPUT_BUTTON_WHEEL_UP : INPUT_BUTTON_WHEEL_DOWN;
                } else if ([event deltaX] != 0) {
                  buttons = ([event deltaX] > 0) ?
                    INPUT_BUTTON_WHEEL_LEFT : INPUT_BUTTON_WHEEL_RIGHT;
                }

                qemu_input_queue_btn(dcl.con, buttons, true);
                qemu_input_event_sync();
                qemu_input_queue_btn(dcl.con, buttons, false);
                qemu_input_event_sync();
            }

            /*
             * Since deltaX/deltaY also report scroll wheel events we prevent mouse
             * movement code from executing.
             */
            mouse_event = false;
            break;
        default:
            return false;
    }

    if (mouse_event) {
        /* Don't send button events to the guest unless we've got a
         * mouse grab or window focus. If we have neither then this event
         * is the user clicking on the background window to activate and
         * bring us to the front, which will be done by the sendEvent
         * call below. We definitely don't want to pass that click through
         * to the guest.
         */
        if ((isMouseGrabbed || [[self window] isKeyWindow]) &&
            (last_buttons != buttons)) {
            static uint32_t bmap[INPUT_BUTTON__MAX] = {
                [INPUT_BUTTON_LEFT]       = MOUSE_EVENT_LBUTTON,
                [INPUT_BUTTON_MIDDLE]     = MOUSE_EVENT_MBUTTON,
                [INPUT_BUTTON_RIGHT]      = MOUSE_EVENT_RBUTTON
            };
            qemu_input_update_buttons(dcl.con, bmap, last_buttons, buttons);
            last_buttons = buttons;
        }
        if (isMouseGrabbed) {
            if (isAbsoluteEnabled) {
                /* Note that the origin for Cocoa mouse coords is bottom left, not top left.
                 * The check on screenContainsPoint is to avoid sending out of range values for
                 * clicks in the titlebar.
                 */
                if ([self screenContainsPoint:p]) {
                    qemu_input_queue_abs(dcl.con, INPUT_AXIS_X, p.x, 0, screen.width);
                    qemu_input_queue_abs(dcl.con, INPUT_AXIS_Y, screen.height - p.y, 0, screen.height);
                }
            } else {
                qemu_input_queue_rel(dcl.con, INPUT_AXIS_X, (int)[event deltaX]);
                qemu_input_queue_rel(dcl.con, INPUT_AXIS_Y, (int)[event deltaY]);
            }
        } else {
            return false;
        }
        qemu_input_event_sync();
    }
    return true;
}

- (void) grabMouse
{
    COCOA_DEBUG("QemuCocoaView: grabMouse\n");

    if (!isFullscreen) {
        if (qemu_name)
            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s - (Press ctrl + alt + g to release Mouse)", qemu_name]];
        else
            [normalWindow setTitle:@"QEMU - (Press ctrl + alt + g to release Mouse)"];
    }
    [self hideCursor];
    CGAssociateMouseAndMouseCursorPosition(isAbsoluteEnabled);
    isMouseGrabbed = TRUE; // while isMouseGrabbed = TRUE, QemuCocoaApp sends all events to [cocoaView handleEvent:]
}

- (void) ungrabMouse
{
    COCOA_DEBUG("QemuCocoaView: ungrabMouse\n");

    if (!isFullscreen) {
        if (qemu_name)
            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s", qemu_name]];
        else
            [normalWindow setTitle:@"QEMU"];
    }
    [self unhideCursor];
    CGAssociateMouseAndMouseCursorPosition(TRUE);
    isMouseGrabbed = FALSE;
}

- (void) setAbsoluteEnabled:(BOOL)tIsAbsoluteEnabled {
    isAbsoluteEnabled = tIsAbsoluteEnabled;
    if (isMouseGrabbed) {
        CGAssociateMouseAndMouseCursorPosition(isAbsoluteEnabled);
    }
}
- (BOOL) isMouseGrabbed {return isMouseGrabbed;}
- (BOOL) isAbsoluteEnabled {return isAbsoluteEnabled;}
- (float) cdx {return cdx;}
- (float) cdy {return cdy;}
- (QEMUScreen) gscreen {return screen;}

/*
 * Makes the target think all down keys are being released.
 * This prevents a stuck key problem, since we will not see
 * key up events for those keys after we have lost focus.
 */
- (void) raiseAllKeys
{
    with_iothread_lock(^{
        qkbd_state_lift_all_keys(kbd);
    });
}
@end



/*
 ------------------------------------------------------
    QemuCocoaAppController
 ------------------------------------------------------
*/
@interface QemuCocoaAppController : NSObject
                                       <NSWindowDelegate, NSApplicationDelegate>
{
}
- (void)doToggleFullScreen:(id)sender;
- (void)toggleFullScreen:(id)sender;
- (void)showQEMUDoc:(id)sender;
- (void)zoomToFit:(id) sender;
- (void)displayConsole:(id)sender;
- (void)pauseQEMU:(id)sender;
- (void)resumeQEMU:(id)sender;
- (void)displayPause;
- (void)removePause;
- (void)restartQEMU:(id)sender;
- (void)powerDownQEMU:(id)sender;
- (void)ejectDeviceMedia:(id)sender;
- (void)changeDeviceMedia:(id)sender;
- (BOOL)verifyQuit;
- (void)openDocumentation:(NSString *)filename;
- (IBAction) do_about_menu_item: (id) sender;
- (void)make_about_window;
- (void)adjustSpeed:(id)sender;
@end

@implementation QemuCocoaAppController
- (id) init
{
    COCOA_DEBUG("QemuCocoaAppController: init\n");

    self = [super init];
    if (self) {

        // create a view and add it to the window
        cocoaView = [[QemuCocoaView alloc] initWithFrame:NSMakeRect(0.0, 0.0, 640.0, 480.0)];
        if(!cocoaView) {
            error_report("(cocoa) can't create a view");
            exit(1);
        }

        // create a window
        normalWindow = [[NSWindow alloc] initWithContentRect:[cocoaView frame]
            styleMask:NSWindowStyleMaskTitled|NSWindowStyleMaskMiniaturizable|NSWindowStyleMaskClosable
            backing:NSBackingStoreBuffered defer:NO];
        if(!normalWindow) {
            error_report("(cocoa) can't create window");
            exit(1);
        }
        [normalWindow setAcceptsMouseMovedEvents:YES];
        [normalWindow setTitle:@"QEMU"];
        [normalWindow setContentView:cocoaView];
        [normalWindow makeKeyAndOrderFront:self];
        [normalWindow center];
        [normalWindow setDelegate: self];
        stretch_video = false;

        /* Used for displaying pause on the screen */
        pauseLabel = [NSTextField new];
        [pauseLabel setBezeled:YES];
        [pauseLabel setDrawsBackground:YES];
        [pauseLabel setBackgroundColor: [NSColor whiteColor]];
        [pauseLabel setEditable:NO];
        [pauseLabel setSelectable:NO];
        [pauseLabel setStringValue: @"Paused"];
        [pauseLabel setFont: [NSFont fontWithName: @"Helvetica" size: 90]];
        [pauseLabel setTextColor: [NSColor blackColor]];
        [pauseLabel sizeToFit];

        [self make_about_window];
    }
    return self;
}

- (void) dealloc
{
    COCOA_DEBUG("QemuCocoaAppController: dealloc\n");

    if (cocoaView)
        [cocoaView release];
    [super dealloc];
}

- (void)applicationDidFinishLaunching: (NSNotification *) note
{
    COCOA_DEBUG("QemuCocoaAppController: applicationDidFinishLaunching\n");
    allow_events = true;
    /* Tell cocoa_display_init to proceed */
    qemu_sem_post(&app_started_sem);
}

- (void)applicationWillTerminate:(NSNotification *)aNotification
{
    COCOA_DEBUG("QemuCocoaAppController: applicationWillTerminate\n");

    qemu_system_shutdown_request(SHUTDOWN_CAUSE_HOST_UI);

    /*
     * Sleep here, because returning will cause OSX to kill us
     * immediately; the QEMU main loop will handle the shutdown
     * request and terminate the process.
     */
    [NSThread sleepForTimeInterval:INFINITY];
}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
{
    return YES;
}

- (NSApplicationTerminateReply)applicationShouldTerminate:
                                                         (NSApplication *)sender
{
    COCOA_DEBUG("QemuCocoaAppController: applicationShouldTerminate\n");
    return [self verifyQuit];
}

- (void)windowDidChangeScreen:(NSNotification *)notification
{
    [cocoaView updateUIInfo];
}

- (void)windowDidResize:(NSNotification *)notification
{
    [cocoaView updateUIInfo];
}

/* Called when the user clicks on a window's close button */
- (BOOL)windowShouldClose:(id)sender
{
    COCOA_DEBUG("QemuCocoaAppController: windowShouldClose\n");
    [NSApp terminate: sender];
    /* If the user allows the application to quit then the call to
     * NSApp terminate will never return. If we get here then the user
     * cancelled the quit, so we should return NO to not permit the
     * closing of this window.
     */
    return NO;
}

/* Called when QEMU goes into the background */
- (void) applicationWillResignActive: (NSNotification *)aNotification
{
    COCOA_DEBUG("QemuCocoaAppController: applicationWillResignActive\n");
    [cocoaView raiseAllKeys];
}

/* We abstract the method called by the Enter Fullscreen menu item
 * because Mac OS 10.7 and higher disables it. This is because of the
 * menu item's old selector's name toggleFullScreen:
 */
- (void) doToggleFullScreen:(id)sender
{
    [self toggleFullScreen:(id)sender];
}

- (void)toggleFullScreen:(id)sender
{
    COCOA_DEBUG("QemuCocoaAppController: toggleFullScreen\n");

    [cocoaView toggleFullScreen:sender];
}

/* Tries to find then open the specified filename */
- (void) openDocumentation: (NSString *) filename
{
    /* Where to look for local files */
    NSString *path_array[] = {@"../share/doc/qemu/", @"../doc/qemu/", @"docs/"};
    NSString *full_file_path;
    NSURL *full_file_url;

    /* iterate thru the possible paths until the file is found */
    int index;
    for (index = 0; index < ARRAY_SIZE(path_array); index++) {
        full_file_path = [[NSBundle mainBundle] executablePath];
        full_file_path = [full_file_path stringByDeletingLastPathComponent];
        full_file_path = [NSString stringWithFormat: @"%@/%@%@", full_file_path,
                          path_array[index], filename];
        full_file_url = [NSURL fileURLWithPath: full_file_path
                                   isDirectory: false];
        if ([[NSWorkspace sharedWorkspace] openURL: full_file_url] == YES) {
            return;
        }
    }

    /* If none of the paths opened a file */
    NSBeep();
    QEMU_Alert(@"Failed to open file");
}

- (void)showQEMUDoc:(id)sender
{
    COCOA_DEBUG("QemuCocoaAppController: showQEMUDoc\n");

    [self openDocumentation: @"index.html"];
}

/* Stretches video to fit host monitor size */
- (void)zoomToFit:(id) sender
{
    stretch_video = !stretch_video;
    if (stretch_video == true) {
        [sender setState: NSControlStateValueOn];
    } else {
        [sender setState: NSControlStateValueOff];
    }
}

/* Displays the console on the screen */
- (void)displayConsole:(id)sender
{
    console_select([sender tag]);
}

/* Pause the guest */
- (void)pauseQEMU:(id)sender
{
    with_iothread_lock(^{
        qmp_stop(NULL);
    });
    [sender setEnabled: NO];
    [[[sender menu] itemWithTitle: @"Resume"] setEnabled: YES];
    [self displayPause];
}

/* Resume running the guest operating system */
- (void)resumeQEMU:(id) sender
{
    with_iothread_lock(^{
        qmp_cont(NULL);
    });
    [sender setEnabled: NO];
    [[[sender menu] itemWithTitle: @"Pause"] setEnabled: YES];
    [self removePause];
}

/* Displays the word pause on the screen */
- (void)displayPause
{
    /* Coordinates have to be calculated each time because the window can change its size */
    int xCoord, yCoord, width, height;
    xCoord = ([normalWindow frame].size.width - [pauseLabel frame].size.width)/2;
    yCoord = [normalWindow frame].size.height - [pauseLabel frame].size.height - ([pauseLabel frame].size.height * .5);
    width = [pauseLabel frame].size.width;
    height = [pauseLabel frame].size.height;
    [pauseLabel setFrame: NSMakeRect(xCoord, yCoord, width, height)];
    [cocoaView addSubview: pauseLabel];
}

/* Removes the word pause from the screen */
- (void)removePause
{
    [pauseLabel removeFromSuperview];
}

/* Restarts QEMU */
- (void)restartQEMU:(id)sender
{
    with_iothread_lock(^{
        qmp_system_reset(NULL);
    });
}

/* Powers down QEMU */
- (void)powerDownQEMU:(id)sender
{
    with_iothread_lock(^{
        qmp_system_powerdown(NULL);
    });
}

/* Ejects the media.
 * Uses sender's tag to figure out the device to eject.
 */
- (void)ejectDeviceMedia:(id)sender
{
    NSString * drive;
    drive = [sender representedObject];
    if(drive == nil) {
        NSBeep();
        QEMU_Alert(@"Failed to find drive to eject!");
        return;
    }

    __block Error *err = NULL;
    with_iothread_lock(^{
        qmp_eject(true, [drive cStringUsingEncoding: NSASCIIStringEncoding],
                  false, NULL, false, false, &err);
    });
    handleAnyDeviceErrors(err);
}

/* Displays a dialog box asking the user to select an image file to load.
 * Uses sender's represented object value to figure out which drive to use.
 */
- (void)changeDeviceMedia:(id)sender
{
    /* Find the drive name */
    NSString * drive;
    drive = [sender representedObject];
    if(drive == nil) {
        NSBeep();
        QEMU_Alert(@"Could not find drive!");
        return;
    }

    /* Display the file open dialog */
    NSOpenPanel * openPanel;
    openPanel = [NSOpenPanel openPanel];
    [openPanel setCanChooseFiles: YES];
    [openPanel setAllowsMultipleSelection: NO];
    if([openPanel runModal] == NSModalResponseOK) {
        NSString * file = [[[openPanel URLs] objectAtIndex: 0] path];
        if(file == nil) {
            NSBeep();
            QEMU_Alert(@"Failed to convert URL to file path!");
            return;
        }

        __block Error *err = NULL;
        with_iothread_lock(^{
            qmp_blockdev_change_medium(true,
                                       [drive cStringUsingEncoding:
                                                  NSASCIIStringEncoding],
                                       false, NULL,
                                       [file cStringUsingEncoding:
                                                 NSASCIIStringEncoding],
                                       true, "raw",
                                       false, 0,
                                       &err);
        });
        handleAnyDeviceErrors(err);
    }
}

/* Verifies if the user really wants to quit */
- (BOOL)verifyQuit
{
    NSAlert *alert = [NSAlert new];
    [alert autorelease];
    [alert setMessageText: @"Are you sure you want to quit QEMU?"];
    [alert addButtonWithTitle: @"Cancel"];
    [alert addButtonWithTitle: @"Quit"];
    if([alert runModal] == NSAlertSecondButtonReturn) {
        return YES;
    } else {
        return NO;
    }
}

/* The action method for the About menu item */
- (IBAction) do_about_menu_item: (id) sender
{
    [about_window makeKeyAndOrderFront: nil];
}

/* Create and display the about dialog */
- (void)make_about_window
{
    /* Make the window */
    int x = 0, y = 0, about_width = 400, about_height = 200;
    NSRect window_rect = NSMakeRect(x, y, about_width, about_height);
    about_window = [[NSWindow alloc] initWithContentRect:window_rect
                    styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
                    NSWindowStyleMaskMiniaturizable
                    backing:NSBackingStoreBuffered
                    defer:NO];
    [about_window setTitle: @"About"];
    [about_window setReleasedWhenClosed: NO];
    [about_window center];
    NSView *superView = [about_window contentView];

    /* Create the dimensions of the picture */
    int picture_width = 80, picture_height = 80;
    x = (about_width - picture_width)/2;
    y = about_height - picture_height - 10;
    NSRect picture_rect = NSMakeRect(x, y, picture_width, picture_height);

    /* Make the picture of QEMU */
    NSImageView *picture_view = [[NSImageView alloc] initWithFrame:
                                                     picture_rect];
    char *qemu_image_path_c = get_relocated_path(CONFIG_QEMU_ICONDIR "/hicolor/512x512/apps/qemu.png");
    NSString *qemu_image_path = [NSString stringWithUTF8String:qemu_image_path_c];
    g_free(qemu_image_path_c);
    NSImage *qemu_image = [[NSImage alloc] initWithContentsOfFile:qemu_image_path];
    [picture_view setImage: qemu_image];
    [picture_view setImageScaling: NSImageScaleProportionallyUpOrDown];
    [superView addSubview: picture_view];

    /* Make the name label */
    NSBundle *bundle = [NSBundle mainBundle];
    if (bundle) {
        x = 0;
        y = y - 25;
        int name_width = about_width, name_height = 20;
        NSRect name_rect = NSMakeRect(x, y, name_width, name_height);
        NSTextField *name_label = [[NSTextField alloc] initWithFrame: name_rect];
        [name_label setEditable: NO];
        [name_label setBezeled: NO];
        [name_label setDrawsBackground: NO];
        [name_label setAlignment: NSTextAlignmentCenter];
        NSString *qemu_name = [[bundle executablePath] lastPathComponent];
        [name_label setStringValue: qemu_name];
        [superView addSubview: name_label];
    }

    /* Set the version label's attributes */
    x = 0;
    y = 50;
    int version_width = about_width, version_height = 20;
    NSRect version_rect = NSMakeRect(x, y, version_width, version_height);
    NSTextField *version_label = [[NSTextField alloc] initWithFrame:
                                                      version_rect];
    [version_label setEditable: NO];
    [version_label setBezeled: NO];
    [version_label setAlignment: NSTextAlignmentCenter];
    [version_label setDrawsBackground: NO];

    /* Create the version string*/
    NSString *version_string;
    version_string = [[NSString alloc] initWithFormat:
    @"QEMU emulator version %s", QEMU_FULL_VERSION];
    [version_label setStringValue: version_string];
    [superView addSubview: version_label];

    /* Make copyright label */
    x = 0;
    y = 35;
    int copyright_width = about_width, copyright_height = 20;
    NSRect copyright_rect = NSMakeRect(x, y, copyright_width, copyright_height);
    NSTextField *copyright_label = [[NSTextField alloc] initWithFrame:
                                                        copyright_rect];
    [copyright_label setEditable: NO];
    [copyright_label setBezeled: NO];
    [copyright_label setDrawsBackground: NO];
    [copyright_label setAlignment: NSTextAlignmentCenter];
    [copyright_label setStringValue: [NSString stringWithFormat: @"%s",
                                     QEMU_COPYRIGHT]];
    [superView addSubview: copyright_label];
}

/* Used by the Speed menu items */
- (void)adjustSpeed:(id)sender
{
    int throttle_pct; /* throttle percentage */
    NSMenu *menu;

    menu = [sender menu];
    if (menu != nil)
    {
        /* Unselect the currently selected item */
        for (NSMenuItem *item in [menu itemArray]) {
            if (item.state == NSControlStateValueOn) {
                [item setState: NSControlStateValueOff];
                break;
            }
        }
    }

    // check the menu item
    [sender setState: NSControlStateValueOn];

    // get the throttle percentage
    throttle_pct = [sender tag];

    with_iothread_lock(^{
        cpu_throttle_set(throttle_pct);
    });
    COCOA_DEBUG("cpu throttling at %d%c\n", cpu_throttle_get_percentage(), '%');
}

@end

@interface QemuApplication : NSApplication
@end

@implementation QemuApplication
- (void)sendEvent:(NSEvent *)event
{
    COCOA_DEBUG("QemuApplication: sendEvent\n");
    if (![cocoaView handleEvent:event]) {
        [super sendEvent: event];
    }
}
@end

static void create_initial_menus(void)
{
    // Add menus
    NSMenu      *menu;
    NSMenuItem  *menuItem;

    [NSApp setMainMenu:[[NSMenu alloc] init]];

    // Application menu
    menu = [[NSMenu alloc] initWithTitle:@""];
    [menu addItemWithTitle:@"About QEMU" action:@selector(do_about_menu_item:) keyEquivalent:@""]; // About QEMU
    [menu addItem:[NSMenuItem separatorItem]]; //Separator
    [menu addItemWithTitle:@"Hide QEMU" action:@selector(hide:) keyEquivalent:@"h"]; //Hide QEMU
    menuItem = (NSMenuItem *)[menu addItemWithTitle:@"Hide Others" action:@selector(hideOtherApplications:) keyEquivalent:@"h"]; // Hide Others
    [menuItem setKeyEquivalentModifierMask:(NSEventModifierFlagOption|NSEventModifierFlagCommand)];
    [menu addItemWithTitle:@"Show All" action:@selector(unhideAllApplications:) keyEquivalent:@""]; // Show All
    [menu addItem:[NSMenuItem separatorItem]]; //Separator
    [menu addItemWithTitle:@"Quit QEMU" action:@selector(terminate:) keyEquivalent:@"q"];
    menuItem = [[NSMenuItem alloc] initWithTitle:@"Apple" action:nil keyEquivalent:@""];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];
    [NSApp performSelector:@selector(setAppleMenu:) withObject:menu]; // Workaround (this method is private since 10.4+)

    // Machine menu
    menu = [[NSMenu alloc] initWithTitle: @"Machine"];
    [menu setAutoenablesItems: NO];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle: @"Pause" action: @selector(pauseQEMU:) keyEquivalent: @""] autorelease]];
    menuItem = [[[NSMenuItem alloc] initWithTitle: @"Resume" action: @selector(resumeQEMU:) keyEquivalent: @""] autorelease];
    [menu addItem: menuItem];
    [menuItem setEnabled: NO];
    [menu addItem: [NSMenuItem separatorItem]];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle: @"Reset" action: @selector(restartQEMU:) keyEquivalent: @""] autorelease]];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle: @"Power Down" action: @selector(powerDownQEMU:) keyEquivalent: @""] autorelease]];
    menuItem = [[[NSMenuItem alloc] initWithTitle: @"Machine" action:nil keyEquivalent:@""] autorelease];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];

    // View menu
    menu = [[NSMenu alloc] initWithTitle:@"View"];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle:@"Enter Fullscreen" action:@selector(doToggleFullScreen:) keyEquivalent:@"f"] autorelease]]; // Fullscreen
    [menu addItem: [[[NSMenuItem alloc] initWithTitle:@"Zoom To Fit" action:@selector(zoomToFit:) keyEquivalent:@""] autorelease]];
    menuItem = [[[NSMenuItem alloc] initWithTitle:@"View" action:nil keyEquivalent:@""] autorelease];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];

    // Speed menu
    menu = [[NSMenu alloc] initWithTitle:@"Speed"];

    // Add the rest of the Speed menu items
    int p, percentage, throttle_pct;
    for (p = 10; p >= 0; p--)
    {
        percentage = p * 10 > 1 ? p * 10 : 1; // prevent a 0% menu item

        menuItem = [[[NSMenuItem alloc]
                   initWithTitle: [NSString stringWithFormat: @"%d%%", percentage] action:@selector(adjustSpeed:) keyEquivalent:@""] autorelease];

        if (percentage == 100) {
            [menuItem setState: NSControlStateValueOn];
        }

        /* Calculate the throttle percentage */
        throttle_pct = -1 * percentage + 100;

        [menuItem setTag: throttle_pct];
        [menu addItem: menuItem];
    }
    menuItem = [[[NSMenuItem alloc] initWithTitle:@"Speed" action:nil keyEquivalent:@""] autorelease];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];

    // Window menu
    menu = [[NSMenu alloc] initWithTitle:@"Window"];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle:@"Minimize" action:@selector(performMiniaturize:) keyEquivalent:@"m"] autorelease]]; // Miniaturize
    menuItem = [[[NSMenuItem alloc] initWithTitle:@"Window" action:nil keyEquivalent:@""] autorelease];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];
    [NSApp setWindowsMenu:menu];

    // Help menu
    menu = [[NSMenu alloc] initWithTitle:@"Help"];
    [menu addItem: [[[NSMenuItem alloc] initWithTitle:@"QEMU Documentation" action:@selector(showQEMUDoc:) keyEquivalent:@"?"] autorelease]]; // QEMU Help
    menuItem = [[[NSMenuItem alloc] initWithTitle:@"Window" action:nil keyEquivalent:@""] autorelease];
    [menuItem setSubmenu:menu];
    [[NSApp mainMenu] addItem:menuItem];
}

/* Returns a name for a given console */
static NSString * getConsoleName(QemuConsole * console)
{
    g_autofree char *label = qemu_console_get_label(console);

    return [NSString stringWithUTF8String:label];
}

/* Add an entry to the View menu for each console */
static void add_console_menu_entries(void)
{
    NSMenu *menu;
    NSMenuItem *menuItem;
    int index = 0;

    menu = [[[NSApp mainMenu] itemWithTitle:@"View"] submenu];

    [menu addItem:[NSMenuItem separatorItem]];

    while (qemu_console_lookup_by_index(index) != NULL) {
        menuItem = [[[NSMenuItem alloc] initWithTitle: getConsoleName(qemu_console_lookup_by_index(index))
                                               action: @selector(displayConsole:) keyEquivalent: @""] autorelease];
        [menuItem setTag: index];
        [menu addItem: menuItem];
        index++;
    }
}

/* Make menu items for all removable devices.
 * Each device is given an 'Eject' and 'Change' menu item.
 */
static void addRemovableDevicesMenuItems(void)
{
    NSMenu *menu;
    NSMenuItem *menuItem;
    BlockInfoList *currentDevice, *pointerToFree;
    NSString *deviceName;

    currentDevice = qmp_query_block(NULL);
    pointerToFree = currentDevice;

    menu = [[[NSApp mainMenu] itemWithTitle:@"Machine"] submenu];

    // Add a separator between related groups of menu items
    [menu addItem:[NSMenuItem separatorItem]];

    // Set the attributes to the "Removable Media" menu item
    NSString *titleString = @"Removable Media";
    NSMutableAttributedString *attString=[[NSMutableAttributedString alloc] initWithString:titleString];
    NSColor *newColor = [NSColor blackColor];
    NSFontManager *fontManager = [NSFontManager sharedFontManager];
    NSFont *font = [fontManager fontWithFamily:@"Helvetica"
                                          traits:NSBoldFontMask|NSItalicFontMask
                                          weight:0
                                            size:14];
    [attString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, [titleString length])];
    [attString addAttribute:NSForegroundColorAttributeName value:newColor range:NSMakeRange(0, [titleString length])];
    [attString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt: 1] range:NSMakeRange(0, [titleString length])];

    // Add the "Removable Media" menu item
    menuItem = [NSMenuItem new];
    [menuItem setAttributedTitle: attString];
    [menuItem setEnabled: NO];
    [menu addItem: menuItem];

    /* Loop through all the block devices in the emulator */
    while (currentDevice) {
        deviceName = [[NSString stringWithFormat: @"%s", currentDevice->value->device] retain];

        if(currentDevice->value->removable) {
            menuItem = [[NSMenuItem alloc] initWithTitle: [NSString stringWithFormat: @"Change %s...", currentDevice->value->device]
                                                  action: @selector(changeDeviceMedia:)
                                           keyEquivalent: @""];
            [menu addItem: menuItem];
            [menuItem setRepresentedObject: deviceName];
            [menuItem autorelease];

            menuItem = [[NSMenuItem alloc] initWithTitle: [NSString stringWithFormat: @"Eject %s", currentDevice->value->device]
                                                  action: @selector(ejectDeviceMedia:)
                                           keyEquivalent: @""];
            [menu addItem: menuItem];
            [menuItem setRepresentedObject: deviceName];
            [menuItem autorelease];
        }
        currentDevice = currentDevice->next;
    }
    qapi_free_BlockInfoList(pointerToFree);
}

@interface QemuCocoaPasteboardTypeOwner : NSObject<NSPasteboardTypeOwner>
@end

@implementation QemuCocoaPasteboardTypeOwner

- (void)pasteboard:(NSPasteboard *)sender provideDataForType:(NSPasteboardType)type
{
    if (type != NSPasteboardTypeString) {
        return;
    }

    with_iothread_lock(^{
        QemuClipboardInfo *info = qemu_clipboard_info_ref(cbinfo);
        qemu_event_reset(&cbevent);
        qemu_clipboard_request(info, QEMU_CLIPBOARD_TYPE_TEXT);

        while (info == cbinfo &&
               info->types[QEMU_CLIPBOARD_TYPE_TEXT].available &&
               info->types[QEMU_CLIPBOARD_TYPE_TEXT].data == NULL) {
            qemu_mutex_unlock_iothread();
            qemu_event_wait(&cbevent);
            qemu_mutex_lock_iothread();
        }

        if (info == cbinfo) {
            NSData *data = [[NSData alloc] initWithBytes:info->types[QEMU_CLIPBOARD_TYPE_TEXT].data
                                           length:info->types[QEMU_CLIPBOARD_TYPE_TEXT].size];
            [sender setData:data forType:NSPasteboardTypeString];
            [data release];
        }

        qemu_clipboard_info_unref(info);
    });
}

@end

static QemuCocoaPasteboardTypeOwner *cbowner;

static void cocoa_clipboard_notify(Notifier *notifier, void *data);
static void cocoa_clipboard_request(QemuClipboardInfo *info,
                                    QemuClipboardType type);

static QemuClipboardPeer cbpeer = {
    .name = "cocoa",
    .notifier = { .notify = cocoa_clipboard_notify },
    .request = cocoa_clipboard_request
};

static void cocoa_clipboard_update_info(QemuClipboardInfo *info)
{
    if (info->owner == &cbpeer || info->selection != QEMU_CLIPBOARD_SELECTION_CLIPBOARD) {
        return;
    }

    if (info != cbinfo) {
        NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
        qemu_clipboard_info_unref(cbinfo);
        cbinfo = qemu_clipboard_info_ref(info);
        cbchangecount = [[NSPasteboard generalPasteboard] declareTypes:@[NSPasteboardTypeString] owner:cbowner];
        [pool release];
    }

    qemu_event_set(&cbevent);
}

static void cocoa_clipboard_notify(Notifier *notifier, void *data)
{
    QemuClipboardNotify *notify = data;

    switch (notify->type) {
    case QEMU_CLIPBOARD_UPDATE_INFO:
        cocoa_clipboard_update_info(notify->info);
        return;
    case QEMU_CLIPBOARD_RESET_SERIAL:
        /* ignore */
        return;
    }
}

static void cocoa_clipboard_request(QemuClipboardInfo *info,
                                    QemuClipboardType type)
{
    NSData *text;

    switch (type) {
    case QEMU_CLIPBOARD_TYPE_TEXT:
        text = [[NSPasteboard generalPasteboard] dataForType:NSPasteboardTypeString];
        if (text) {
            qemu_clipboard_set_data(&cbpeer, info, type,
                                    [text length], [text bytes], true);
            [text release];
        }
        break;
    default:
        break;
    }
}

/*
 * The startup process for the OSX/Cocoa UI is complicated, because
 * OSX insists that the UI runs on the initial main thread, and so we
 * need to start a second thread which runs the vl.c qemu_main():
 *
 * Initial thread:                    2nd thread:
 * in main():
 *  create qemu-main thread
 *  wait on display_init semaphore
 *                                    call qemu_main()
 *                                    ...
 *                                    in cocoa_display_init():
 *                                     post the display_init semaphore
 *                                     wait on app_started semaphore
 *  create application, menus, etc
 *  enter OSX run loop
 * in applicationDidFinishLaunching:
 *  post app_started semaphore
 *                                     tell main thread to fullscreen if needed
 *                                    [...]
 *                                    run qemu main-loop
 *
 * We do this in two stages so that we don't do the creation of the
 * GUI application menus and so on for command line options like --help
 * where we want to just print text to stdout and exit immediately.
 */

static void *call_qemu_main(void *opaque)
{
    int status;

    COCOA_DEBUG("Second thread: calling qemu_main()\n");
    status = qemu_main(gArgc, gArgv, *_NSGetEnviron());
    COCOA_DEBUG("Second thread: qemu_main() returned, exiting\n");
    [cbowner release];
    exit(status);
}

int main (int argc, char **argv) {
    QemuThread thread;

    COCOA_DEBUG("Entered main()\n");
    gArgc = argc;
    gArgv = argv;

    qemu_sem_init(&display_init_sem, 0);
    qemu_sem_init(&app_started_sem, 0);

    qemu_thread_create(&thread, "qemu_main", call_qemu_main,
                       NULL, QEMU_THREAD_DETACHED);

    COCOA_DEBUG("Main thread: waiting for display_init_sem\n");
    qemu_sem_wait(&display_init_sem);
    COCOA_DEBUG("Main thread: initializing app\n");

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    // Pull this console process up to being a fully-fledged graphical
    // app with a menubar and Dock icon
    ProcessSerialNumber psn = { 0, kCurrentProcess };
    TransformProcessType(&psn, kProcessTransformToForegroundApplication);

    [QemuApplication sharedApplication];

    create_initial_menus();

    /*
     * Create the menu entries which depend on QEMU state (for consoles
     * and removeable devices). These make calls back into QEMU functions,
     * which is OK because at this point we know that the second thread
     * holds the iothread lock and is synchronously waiting for us to
     * finish.
     */
    add_console_menu_entries();
    addRemovableDevicesMenuItems();

    // Create an Application controller
    QemuCocoaAppController *appController = [[QemuCocoaAppController alloc] init];
    [NSApp setDelegate:appController];

    // Start the main event loop
    COCOA_DEBUG("Main thread: entering OSX run loop\n");
    [NSApp run];
    COCOA_DEBUG("Main thread: left OSX run loop, exiting\n");

    [appController release];
    [pool release];

    return 0;
}



#pragma mark qemu
static void cocoa_update(DisplayChangeListener *dcl,
                         int x, int y, int w, int h)
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    COCOA_DEBUG("qemu_cocoa: cocoa_update\n");

    dispatch_async(dispatch_get_main_queue(), ^{
        NSRect rect;
        if ([cocoaView cdx] == 1.0) {
            rect = NSMakeRect(x, [cocoaView gscreen].height - y - h, w, h);
        } else {
            rect = NSMakeRect(
                x * [cocoaView cdx],
                ([cocoaView gscreen].height - y - h) * [cocoaView cdy],
                w * [cocoaView cdx],
                h * [cocoaView cdy]);
        }
        [cocoaView setNeedsDisplayInRect:rect];
    });

    [pool release];
}

static void cocoa_switch(DisplayChangeListener *dcl,
                         DisplaySurface *surface)
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    pixman_image_t *image = surface->image;

    COCOA_DEBUG("qemu_cocoa: cocoa_switch\n");

    // The DisplaySurface will be freed as soon as this callback returns.
    // We take a reference to the underlying pixman image here so it does
    // not disappear from under our feet; the switchSurface method will
    // deref the old image when it is done with it.
    pixman_image_ref(image);

    dispatch_async(dispatch_get_main_queue(), ^{
        [cocoaView updateUIInfo];
        [cocoaView switchSurface:image];
    });
    [pool release];
}

static void cocoa_refresh(DisplayChangeListener *dcl)
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    COCOA_DEBUG("qemu_cocoa: cocoa_refresh\n");
    graphic_hw_update(NULL);

    if (qemu_input_is_absolute()) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (![cocoaView isAbsoluteEnabled]) {
                if ([cocoaView isMouseGrabbed]) {
                    [cocoaView ungrabMouse];
                }
            }
            [cocoaView setAbsoluteEnabled:YES];
        });
    }

    if (cbchangecount != [[NSPasteboard generalPasteboard] changeCount]) {
        qemu_clipboard_info_unref(cbinfo);
        cbinfo = qemu_clipboard_info_new(&cbpeer, QEMU_CLIPBOARD_SELECTION_CLIPBOARD);
        if ([[NSPasteboard generalPasteboard] availableTypeFromArray:@[NSPasteboardTypeString]]) {
            cbinfo->types[QEMU_CLIPBOARD_TYPE_TEXT].available = true;
        }
        qemu_clipboard_update(cbinfo);
        cbchangecount = [[NSPasteboard generalPasteboard] changeCount];
        qemu_event_set(&cbevent);
    }

    [pool release];
}

static void cocoa_display_init(DisplayState *ds, DisplayOptions *opts)
{
    COCOA_DEBUG("qemu_cocoa: cocoa_display_init\n");

    /* Tell main thread to go ahead and create the app and enter the run loop */
    qemu_sem_post(&display_init_sem);
    qemu_sem_wait(&app_started_sem);
    COCOA_DEBUG("cocoa_display_init: app start completed\n");

    /* if fullscreen mode is to be used */
    if (opts->has_full_screen && opts->full_screen) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [NSApp activateIgnoringOtherApps: YES];
            [(QemuCocoaAppController *)[[NSApplication sharedApplication] delegate] toggleFullScreen: nil];
        });
    }
    if (opts->has_show_cursor && opts->show_cursor) {
        cursor_hide = 0;
    }

    // register vga output callbacks
    register_displaychangelistener(&dcl);

    qemu_event_init(&cbevent, false);
    cbowner = [[QemuCocoaPasteboardTypeOwner alloc] init];
    qemu_clipboard_peer_register(&cbpeer);
}

static QemuDisplay qemu_display_cocoa = {
    .type       = DISPLAY_TYPE_COCOA,
    .init       = cocoa_display_init,
};

static void register_cocoa(void)
{
    qemu_display_register(&qemu_display_cocoa);
}

type_init(register_cocoa);