wine/dlls/winemac.drv/display.c

/*
 * MACDRV display settings
 *
 * Copyright 2003 Alexander James Pasadyn
 * Copyright 2011, 2012, 2013 Ken Thomases for CodeWeavers Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include "macdrv.h"
#include "winuser.h"
#include "winreg.h"
#include "ddrawi.h"
#include "wine/unicode.h"

WINE_DEFAULT_DEBUG_CHANNEL(display);


struct display_mode_descriptor
{
    DWORD width;
    DWORD height;
    DWORD pixel_width;
    DWORD pixel_height;
    DWORD io_flags;
    double refresh;
    CFStringRef pixel_encoding;
};


BOOL CDECL macdrv_EnumDisplaySettingsEx(LPCWSTR devname, DWORD mode, LPDEVMODEW devmode, DWORD flags);


static const char initial_mode_key[] = "Initial Display Mode";
static const WCHAR pixelencodingW[] = {'P','i','x','e','l','E','n','c','o','d','i','n','g',0};


static CFArrayRef modes;
static BOOL modes_has_8bpp, modes_has_16bpp;
static int default_mode_bpp;
static CRITICAL_SECTION modes_section;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
    0, 0, &modes_section,
    { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": modes_section") }
};
static CRITICAL_SECTION modes_section = { &critsect_debug, -1, 0, 0, 0, 0 };

static BOOL inited_original_display_mode;


static inline HMONITOR display_id_to_monitor(CGDirectDisplayID display_id)
{
    return (HMONITOR)(UINT_PTR)display_id;
}

static inline CGDirectDisplayID monitor_to_display_id(HMONITOR handle)
{
    return (CGDirectDisplayID)(UINT_PTR)handle;
}


static BOOL get_display_device_reg_key(char *key, unsigned len)
{
    static const char display_device_guid_prop[] = "__wine_display_device_guid";
    static const char video_path[] = "System\\CurrentControlSet\\Control\\Video\\{";
    static const char display0[] = "}\\0000";
    ATOM guid_atom;

    assert(len >= sizeof(video_path) + sizeof(display0) + 40);

    guid_atom = HandleToULong(GetPropA(GetDesktopWindow(), display_device_guid_prop));
    if (!guid_atom) return FALSE;

    memcpy(key, video_path, sizeof(video_path));

    if (!GlobalGetAtomNameA(guid_atom, key + strlen(key), 40))
        return FALSE;

    strcat(key, display0);

    TRACE("display device key %s\n", wine_dbgstr_a(key));
    return TRUE;
}


static BOOL read_registry_settings(DEVMODEW *dm)
{
    char wine_mac_reg_key[128];
    HKEY hkey;
    DWORD type, size;
    BOOL ret = TRUE;

    dm->dmFields = 0;

    if (!get_display_device_reg_key(wine_mac_reg_key, sizeof(wine_mac_reg_key)))
        return FALSE;

    if (RegOpenKeyExA(HKEY_CURRENT_CONFIG, wine_mac_reg_key, 0, KEY_READ, &hkey))
        return FALSE;

#define query_value(name, data) \
    size = sizeof(DWORD); \
    if (RegQueryValueExA(hkey, name, 0, &type, (LPBYTE)(data), &size) || \
        type != REG_DWORD || size != sizeof(DWORD)) \
        ret = FALSE

    query_value("DefaultSettings.BitsPerPel", &dm->dmBitsPerPel);
    dm->dmFields |= DM_BITSPERPEL;
    query_value("DefaultSettings.XResolution", &dm->dmPelsWidth);
    dm->dmFields |= DM_PELSWIDTH;
    query_value("DefaultSettings.YResolution", &dm->dmPelsHeight);
    dm->dmFields |= DM_PELSHEIGHT;
    query_value("DefaultSettings.VRefresh", &dm->dmDisplayFrequency);
    dm->dmFields |= DM_DISPLAYFREQUENCY;
    query_value("DefaultSettings.Flags", &dm->dmDisplayFlags);
    dm->dmFields |= DM_DISPLAYFLAGS;
    query_value("DefaultSettings.XPanning", &dm->dmPosition.x);
    query_value("DefaultSettings.YPanning", &dm->dmPosition.y);
    query_value("DefaultSettings.Orientation", &dm->dmDisplayOrientation);
    query_value("DefaultSettings.FixedOutput", &dm->dmDisplayFixedOutput);

#undef query_value

    RegCloseKey(hkey);
    return ret;
}


static BOOL write_registry_settings(const DEVMODEW *dm)
{
    char wine_mac_reg_key[128];
    HKEY hkey;
    BOOL ret = TRUE;

    if (!get_display_device_reg_key(wine_mac_reg_key, sizeof(wine_mac_reg_key)))
        return FALSE;

    if (RegCreateKeyExA(HKEY_CURRENT_CONFIG, wine_mac_reg_key, 0, NULL,
                        REG_OPTION_VOLATILE, KEY_WRITE, NULL, &hkey, NULL))
        return FALSE;

#define set_value(name, data) \
    if (RegSetValueExA(hkey, name, 0, REG_DWORD, (const BYTE*)(data), sizeof(DWORD))) \
        ret = FALSE

    set_value("DefaultSettings.BitsPerPel", &dm->dmBitsPerPel);
    set_value("DefaultSettings.XResolution", &dm->dmPelsWidth);
    set_value("DefaultSettings.YResolution", &dm->dmPelsHeight);
    set_value("DefaultSettings.VRefresh", &dm->dmDisplayFrequency);
    set_value("DefaultSettings.Flags", &dm->dmDisplayFlags);
    set_value("DefaultSettings.XPanning", &dm->dmPosition.x);
    set_value("DefaultSettings.YPanning", &dm->dmPosition.y);
    set_value("DefaultSettings.Orientation", &dm->dmDisplayOrientation);
    set_value("DefaultSettings.FixedOutput", &dm->dmDisplayFixedOutput);

#undef set_value

    RegCloseKey(hkey);
    return ret;
}


static BOOL write_display_settings(HKEY parent_hkey, CGDirectDisplayID displayID)
{
    BOOL ret = FALSE;
    char display_key_name[19];
    HKEY display_hkey;
    CGDisplayModeRef display_mode;
    DWORD val;
    CFStringRef pixel_encoding;
    size_t len;
    WCHAR* buf = NULL;

    snprintf(display_key_name, sizeof(display_key_name), "Display 0x%08x", CGDisplayUnitNumber(displayID));
    /* @@ Wine registry key: HKLM\Software\Wine\Mac Driver\Initial Display Mode\Display 0xnnnnnnnn */
    if (RegCreateKeyExA(parent_hkey, display_key_name, 0, NULL,
                        REG_OPTION_VOLATILE, KEY_WRITE, NULL, &display_hkey, NULL))
        return FALSE;

    display_mode = CGDisplayCopyDisplayMode(displayID);
    if (!display_mode)
        goto fail;

    val = CGDisplayModeGetWidth(display_mode);
    if (RegSetValueExA(display_hkey, "Width", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
        goto fail;
    val = CGDisplayModeGetHeight(display_mode);
    if (RegSetValueExA(display_hkey, "Height", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
        goto fail;
    val = CGDisplayModeGetRefreshRate(display_mode) * 100;
    if (RegSetValueExA(display_hkey, "RefreshRateTimes100", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
        goto fail;
    val = CGDisplayModeGetIOFlags(display_mode);
    if (RegSetValueExA(display_hkey, "IOFlags", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
        goto fail;

#if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
    if (CGDisplayModeGetPixelWidth != NULL && CGDisplayModeGetPixelHeight != NULL)
    {
        val = CGDisplayModeGetPixelWidth(display_mode);
        if (RegSetValueExA(display_hkey, "PixelWidth", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
            goto fail;
        val = CGDisplayModeGetPixelHeight(display_mode);
        if (RegSetValueExA(display_hkey, "PixelHeight", 0, REG_DWORD, (const BYTE*)&val, sizeof(val)))
            goto fail;
    }
#endif

    pixel_encoding = CGDisplayModeCopyPixelEncoding(display_mode);
    len = CFStringGetLength(pixel_encoding);
    buf = HeapAlloc(GetProcessHeap(), 0, (len + 1) * sizeof(WCHAR));
    CFStringGetCharacters(pixel_encoding, CFRangeMake(0, len), (UniChar*)buf);
    buf[len] = 0;
    CFRelease(pixel_encoding);
    if (RegSetValueExW(display_hkey, pixelencodingW, 0, REG_SZ, (const BYTE*)buf, (len + 1) * sizeof(WCHAR)))
        goto fail;

    ret = TRUE;

fail:
    HeapFree(GetProcessHeap(), 0, buf);
    if (display_mode) CGDisplayModeRelease(display_mode);
    RegCloseKey(display_hkey);
    if (!ret)
        RegDeleteKeyA(parent_hkey, display_key_name);
    return ret;
}


static void init_original_display_mode(void)
{
    BOOL success = FALSE;
    HKEY mac_driver_hkey, parent_hkey;
    DWORD disposition;
    struct macdrv_display *displays = NULL;
    int num_displays, i;

    if (inited_original_display_mode)
        return;

    /* @@ Wine registry key: HKLM\Software\Wine\Mac Driver */
    if (RegCreateKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\Mac Driver", 0, NULL,
                        0, KEY_ALL_ACCESS, NULL, &mac_driver_hkey, NULL))
        return;

    /* @@ Wine registry key: HKLM\Software\Wine\Mac Driver\Initial Display Mode */
    if (RegCreateKeyExA(mac_driver_hkey, initial_mode_key, 0, NULL,
                        REG_OPTION_VOLATILE, KEY_WRITE, NULL, &parent_hkey, &disposition))
    {
        parent_hkey = NULL;
        goto fail;
    }

    /* If we didn't create a new key, then it already existed.  Something already stored
       the initial display mode since Wine was started.  We don't want to overwrite it. */
    if (disposition != REG_CREATED_NEW_KEY)
        goto done;

    if (macdrv_get_displays(&displays, &num_displays))
        goto fail;

    for (i = 0; i < num_displays; i++)
    {
        if (!write_display_settings(parent_hkey, displays[i].displayID))
            goto fail;
    }

done:
    success = TRUE;

fail:
    macdrv_free_displays(displays);
    RegCloseKey(parent_hkey);
    if (!success && parent_hkey)
        RegDeleteTreeA(mac_driver_hkey, initial_mode_key);
    RegCloseKey(mac_driver_hkey);
    if (success)
        inited_original_display_mode = TRUE;
}


static BOOL read_dword(HKEY hkey, const char* name, DWORD* val)
{
    DWORD type, size = sizeof(*val);
    if (RegQueryValueExA(hkey, name, 0, &type, (BYTE*)val, &size) || type != REG_DWORD || size != sizeof(*val))
        return FALSE;
    return TRUE;
}


static void free_display_mode_descriptor(struct display_mode_descriptor* desc)
{
    if (desc)
    {
        if (desc->pixel_encoding)
            CFRelease(desc->pixel_encoding);
        HeapFree(GetProcessHeap(), 0, desc);
    }
}


static struct display_mode_descriptor* create_original_display_mode_descriptor(CGDirectDisplayID displayID)
{
    static const char display_key_format[] = "Software\\Wine\\Mac Driver\\Initial Display Mode\\Display 0x%08x";
    struct display_mode_descriptor* ret = NULL;
    struct display_mode_descriptor* desc;
    char display_key[sizeof(display_key_format) + 10];
    HKEY hkey;
    DWORD type, size;
    DWORD refresh100;
    WCHAR* pixel_encoding = NULL, *end;

    init_original_display_mode();

    snprintf(display_key, sizeof(display_key), display_key_format, CGDisplayUnitNumber(displayID));
    /* @@ Wine registry key: HKLM\Software\Wine\Mac Driver\Initial Display Mode\Display 0xnnnnnnnn */
    if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, display_key, 0, KEY_READ, &hkey))
        return NULL;

    desc = HeapAlloc(GetProcessHeap(), 0, sizeof(*desc));
    desc->pixel_encoding = NULL;

    if (!read_dword(hkey, "Width", &desc->width) ||
        !read_dword(hkey, "Height", &desc->height) ||
        !read_dword(hkey, "RefreshRateTimes100", &refresh100) ||
        !read_dword(hkey, "IOFlags", &desc->io_flags))
        goto done;
    if (refresh100)
        desc->refresh = refresh100 / 100.0;
    else
        desc->refresh = 60;

    if (!read_dword(hkey, "PixelWidth", &desc->pixel_width) ||
        !read_dword(hkey, "PixelHeight", &desc->pixel_height))
    {
        desc->pixel_width = desc->width;
        desc->pixel_height = desc->height;
    }

    size = 0;
    if (RegQueryValueExW(hkey, pixelencodingW, 0, &type, NULL, &size) || type != REG_SZ)
        goto done;
    pixel_encoding = HeapAlloc(GetProcessHeap(), 0, size * sizeof(WCHAR));
    if (RegQueryValueExW(hkey, pixelencodingW, 0, &type, (BYTE*)pixel_encoding, &size) || type != REG_SZ)
        goto done;
    if ((end = memchrW(pixel_encoding, 0, size)))
        size = end - pixel_encoding;
    desc->pixel_encoding = CFStringCreateWithCharacters(NULL, (const UniChar*)pixel_encoding, size);

    ret = desc;

done:
    if (!ret)
        free_display_mode_descriptor(desc);
    HeapFree(GetProcessHeap(), 0, pixel_encoding);
    RegCloseKey(hkey);
    return ret;
}


static BOOL display_mode_matches_descriptor(CGDisplayModeRef mode, const struct display_mode_descriptor* desc)
{
    DWORD mode_io_flags;
    double mode_refresh;
    CFStringRef mode_pixel_encoding;

    if (!desc)
        return FALSE;

    if (CGDisplayModeGetWidth(mode) != desc->width ||
        CGDisplayModeGetHeight(mode) != desc->height)
        return FALSE;

    mode_io_flags = CGDisplayModeGetIOFlags(mode);
    if ((desc->io_flags ^ mode_io_flags) & (kDisplayModeValidFlag | kDisplayModeSafeFlag | kDisplayModeStretchedFlag |
                                            kDisplayModeInterlacedFlag | kDisplayModeTelevisionFlag))
        return FALSE;

    mode_refresh = CGDisplayModeGetRefreshRate(mode);
    if (!mode_refresh)
        mode_refresh = 60;
    if (fabs(desc->refresh - mode_refresh) > 0.1)
        return FALSE;

#if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
    if (CGDisplayModeGetPixelWidth != NULL && CGDisplayModeGetPixelHeight != NULL)
    {
        if (CGDisplayModeGetPixelWidth(mode) != desc->pixel_width ||
            CGDisplayModeGetPixelHeight(mode) != desc->pixel_height)
            return FALSE;
    }
    else
#endif
    if (CGDisplayModeGetWidth(mode) != desc->pixel_width ||
        CGDisplayModeGetHeight(mode) != desc->pixel_height)
        return FALSE;

    mode_pixel_encoding = CGDisplayModeCopyPixelEncoding(mode);
    if (!CFEqual(mode_pixel_encoding, desc->pixel_encoding))
    {
        CFRelease(mode_pixel_encoding);
        return FALSE;
    }
    CFRelease(mode_pixel_encoding);

    return TRUE;
}


static int display_mode_bits_per_pixel(CGDisplayModeRef display_mode)
{
    CFStringRef pixel_encoding;
    int bits_per_pixel = 0;

    pixel_encoding = CGDisplayModeCopyPixelEncoding(display_mode);
    if (pixel_encoding)
    {
        if (CFEqual(pixel_encoding, CFSTR(kIO32BitFloatPixels)))
            bits_per_pixel = 128;
        else if (CFEqual(pixel_encoding, CFSTR(kIO16BitFloatPixels)))
            bits_per_pixel = 64;
        else if (CFEqual(pixel_encoding, CFSTR(kIO64BitDirectPixels)))
            bits_per_pixel = 64;
        else if (CFEqual(pixel_encoding, CFSTR(kIO30BitDirectPixels)))
            bits_per_pixel = 30;
        else if (CFEqual(pixel_encoding, CFSTR(IO32BitDirectPixels)))
            bits_per_pixel = 32;
        else if (CFEqual(pixel_encoding, CFSTR(IO16BitDirectPixels)))
            bits_per_pixel = 16;
        else if (CFEqual(pixel_encoding, CFSTR(IO8BitIndexedPixels)))
            bits_per_pixel = 8;
        else if (CFEqual(pixel_encoding, CFSTR(IO4BitIndexedPixels)))
            bits_per_pixel = 4;
        else if (CFEqual(pixel_encoding, CFSTR(IO2BitIndexedPixels)))
            bits_per_pixel = 2;
        else if (CFEqual(pixel_encoding, CFSTR(IO1BitIndexedPixels)))
            bits_per_pixel = 1;

        CFRelease(pixel_encoding);
    }

    return bits_per_pixel;
}


static int get_default_bpp(void)
{
    int ret;

    EnterCriticalSection(&modes_section);

    if (!default_mode_bpp)
    {
        CGDisplayModeRef mode = CGDisplayCopyDisplayMode(kCGDirectMainDisplay);
        if (mode)
        {
            default_mode_bpp = display_mode_bits_per_pixel(mode);
            CFRelease(mode);
        }

        if (!default_mode_bpp)
            default_mode_bpp = 32;
    }

    ret = default_mode_bpp;

    LeaveCriticalSection(&modes_section);

    TRACE(" -> %d\n", ret);
    return ret;
}


#if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
static CFDictionaryRef create_mode_dict(CGDisplayModeRef display_mode, BOOL is_original)
{
    CFDictionaryRef ret;
    SInt32 io_flags = CGDisplayModeGetIOFlags(display_mode);
    SInt64 width = CGDisplayModeGetWidth(display_mode);
    SInt64 height = CGDisplayModeGetHeight(display_mode);
    double refresh_rate = CGDisplayModeGetRefreshRate(display_mode);
    CFStringRef pixel_encoding = CGDisplayModeCopyPixelEncoding(display_mode);
    CFNumberRef cf_io_flags, cf_width, cf_height, cf_refresh;

    if (retina_enabled && is_original)
    {
        width *= 2;
        height *= 2;
    }

    io_flags &= kDisplayModeValidFlag | kDisplayModeSafeFlag | kDisplayModeInterlacedFlag |
                kDisplayModeStretchedFlag | kDisplayModeTelevisionFlag;
    cf_io_flags = CFNumberCreate(NULL, kCFNumberSInt32Type, &io_flags);
    cf_width = CFNumberCreate(NULL, kCFNumberSInt64Type, &width);
    cf_height = CFNumberCreate(NULL, kCFNumberSInt64Type, &height);
    cf_refresh = CFNumberCreate(NULL, kCFNumberDoubleType, &refresh_rate);

    {
        static const CFStringRef keys[] = {
            CFSTR("io_flags"),
            CFSTR("width"),
            CFSTR("height"),
            CFSTR("pixel_encoding"),
            CFSTR("refresh_rate"),
        };
        const void* values[sizeof(keys) / sizeof(keys[0])] = {
            cf_io_flags,
            cf_width,
            cf_height,
            pixel_encoding,
            cf_refresh,
        };

        ret = CFDictionaryCreate(NULL, (const void**)keys, (const void**)values, sizeof(keys) / sizeof(keys[0]),
                                 &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
    }

    CFRelease(pixel_encoding);
    CFRelease(cf_io_flags);
    CFRelease(cf_width);
    CFRelease(cf_height);
    CFRelease(cf_refresh);

    return ret;
}
#endif


/***********************************************************************
 *              copy_display_modes
 *
 * Wrapper around CGDisplayCopyAllDisplayModes() to include additional
 * modes on Retina-capable systems, but filter those which would confuse
 * Windows apps (basically duplicates at different DPIs).
 *
 * For example, some Retina Macs support a 1920x1200 mode, but it's not
 * returned from CGDisplayCopyAllDisplayModes() without special options.
 * This is especially bad if that's the user's default mode, since then
 * no "available" mode matches the initial settings.
 */
static CFArrayRef copy_display_modes(CGDirectDisplayID display)
{
    CFArrayRef modes = NULL;

#if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
    if (&kCGDisplayShowDuplicateLowResolutionModes != NULL &&
        CGDisplayModeGetPixelWidth != NULL && CGDisplayModeGetPixelHeight != NULL)
    {
        CFDictionaryRef options;
        struct display_mode_descriptor* desc;
        CFMutableDictionaryRef modes_by_size;
        CFIndex i, count;
        CGDisplayModeRef* mode_array;

        options = CFDictionaryCreate(NULL, (const void**)&kCGDisplayShowDuplicateLowResolutionModes,
                                     (const void**)&kCFBooleanTrue, 1, &kCFTypeDictionaryKeyCallBacks,
                                     &kCFTypeDictionaryValueCallBacks);

        modes = CGDisplayCopyAllDisplayModes(display, options);
        if (options)
            CFRelease(options);
        if (!modes)
            return NULL;

        desc = create_original_display_mode_descriptor(display);

        modes_by_size = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
        count = CFArrayGetCount(modes);
        for (i = 0; i < count; i++)
        {
            BOOL better = TRUE;
            CGDisplayModeRef new_mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(modes, i);
            BOOL new_is_original = display_mode_matches_descriptor(new_mode, desc);
            CFDictionaryRef key = create_mode_dict(new_mode, new_is_original);

            /* If a given mode is the user's default, then always list it in preference to any similar
               modes that may exist. */
            if (new_is_original)
                better = TRUE;
            else
            {
                CFStringRef pixel_encoding = CGDisplayModeCopyPixelEncoding(new_mode);
                CGDisplayModeRef old_mode;

                if (pixel_encoding)
                {
                    BOOL bpp30 = CFEqual(pixel_encoding, CFSTR(kIO30BitDirectPixels));
                    CFRelease(pixel_encoding);
                    if (bpp30)
                    {
                        /* This is an odd pixel encoding.  It seems it's only returned
                           when using kCGDisplayShowDuplicateLowResolutionModes.  It's
                           32bpp in terms of the actual raster layout, but it's 10
                           bits per component.  I think that no Windows program is
                           likely to need it and they will probably be confused by it.
                           Skip it. */
                        CFRelease(key);
                        continue;
                    }
                }

                old_mode = (CGDisplayModeRef)CFDictionaryGetValue(modes_by_size, key);
                if (old_mode)
                {
                    BOOL old_is_original = display_mode_matches_descriptor(old_mode, desc);

                    if (old_is_original)
                        better = FALSE;
                    else
                    {
                        /* Otherwise, prefer a mode whose pixel size equals its point size over one which
                           is scaled. */
                        size_t width_points = CGDisplayModeGetWidth(new_mode);
                        size_t height_points = CGDisplayModeGetHeight(new_mode);
                        size_t new_width_pixels = CGDisplayModeGetPixelWidth(new_mode);
                        size_t new_height_pixels = CGDisplayModeGetPixelHeight(new_mode);
                        size_t old_width_pixels = CGDisplayModeGetPixelWidth(old_mode);
                        size_t old_height_pixels = CGDisplayModeGetPixelHeight(old_mode);
                        BOOL new_size_same = (new_width_pixels == width_points && new_height_pixels == height_points);
                        BOOL old_size_same = (old_width_pixels == width_points && old_height_pixels == height_points);

                        if (new_size_same && !old_size_same)
                            better = TRUE;
                        else if (!new_size_same && old_size_same)
                            better = FALSE;
                        else
                        {
                            /* Otherwise, prefer the mode with the smaller pixel size. */
                            if (old_width_pixels < new_width_pixels || old_height_pixels < new_height_pixels)
                                better = FALSE;
                        }
                    }
                }
            }

            if (better)
                CFDictionarySetValue(modes_by_size, key, new_mode);

            CFRelease(key);
        }

        free_display_mode_descriptor(desc);
        CFRelease(modes);

        count = CFDictionaryGetCount(modes_by_size);
        mode_array = HeapAlloc(GetProcessHeap(), 0, count * sizeof(mode_array[0]));
        CFDictionaryGetKeysAndValues(modes_by_size, NULL, (const void **)mode_array);
        modes = CFArrayCreate(NULL, (const void **)mode_array, count, &kCFTypeArrayCallBacks);
        HeapFree(GetProcessHeap(), 0, mode_array);
        CFRelease(modes_by_size);
    }
    else
#endif
        modes = CGDisplayCopyAllDisplayModes(display, NULL);

    return modes;
}


void check_retina_status(void)
{
    if (retina_enabled)
    {
        struct display_mode_descriptor* desc = create_original_display_mode_descriptor(kCGDirectMainDisplay);
        CGDisplayModeRef mode = CGDisplayCopyDisplayMode(kCGDirectMainDisplay);
        BOOL new_value = display_mode_matches_descriptor(mode, desc);

        CGDisplayModeRelease(mode);
        free_display_mode_descriptor(desc);

        if (new_value != retina_on)
            macdrv_set_cocoa_retina_mode(new_value);
    }
}


/***********************************************************************
 *              ChangeDisplaySettingsEx  (MACDRV.@)
 *
 */
LONG CDECL macdrv_ChangeDisplaySettingsEx(LPCWSTR devname, LPDEVMODEW devmode,
                                          HWND hwnd, DWORD flags, LPVOID lpvoid)
{
    LONG ret = DISP_CHANGE_BADMODE;
    int bpp;
    DEVMODEW dm;
    BOOL def_mode = TRUE;
    struct macdrv_display *displays;
    int num_displays;
    CFArrayRef display_modes;
    struct display_mode_descriptor* desc;
    CFIndex count, i, safe, best;
    CGDisplayModeRef best_display_mode;
    uint32_t best_io_flags;
    BOOL best_is_original;

    TRACE("%s %p %p 0x%08x %p\n", debugstr_w(devname), devmode, hwnd, flags, lpvoid);

    init_original_display_mode();

    if (devmode)
    {
        /* this is the minimal dmSize that XP accepts */
        if (devmode->dmSize < FIELD_OFFSET(DEVMODEW, dmFields))
            return DISP_CHANGE_FAILED;

        if (devmode->dmSize >= FIELD_OFFSET(DEVMODEW, dmFields) + sizeof(devmode->dmFields))
        {
            if (((devmode->dmFields & DM_BITSPERPEL) && devmode->dmBitsPerPel) ||
                ((devmode->dmFields & DM_PELSWIDTH) && devmode->dmPelsWidth) ||
                ((devmode->dmFields & DM_PELSHEIGHT) && devmode->dmPelsHeight) ||
                ((devmode->dmFields & DM_DISPLAYFREQUENCY) && devmode->dmDisplayFrequency))
                def_mode = FALSE;
        }
    }

    if (def_mode)
    {
        if (!macdrv_EnumDisplaySettingsEx(devname, ENUM_REGISTRY_SETTINGS, &dm, 0))
        {
            ERR("Default mode not found!\n");
            return DISP_CHANGE_BADMODE;
        }

        TRACE("Return to original display mode\n");
        devmode = &dm;
    }

    if ((devmode->dmFields & (DM_PELSWIDTH | DM_PELSHEIGHT)) != (DM_PELSWIDTH | DM_PELSHEIGHT))
    {
        WARN("devmode doesn't specify the resolution: %04x\n", devmode->dmFields);
        return DISP_CHANGE_BADMODE;
    }

    if (macdrv_get_displays(&displays, &num_displays))
        return DISP_CHANGE_FAILED;

    display_modes = copy_display_modes(displays[0].displayID);
    if (!display_modes)
    {
        macdrv_free_displays(displays);
        return DISP_CHANGE_FAILED;
    }

    bpp = get_default_bpp();
    if ((devmode->dmFields & DM_BITSPERPEL) && devmode->dmBitsPerPel != bpp)
        TRACE("using default %d bpp instead of caller's request %d bpp\n", bpp, devmode->dmBitsPerPel);

    TRACE("looking for %dx%dx%dbpp @%d Hz",
          (devmode->dmFields & DM_PELSWIDTH ? devmode->dmPelsWidth : 0),
          (devmode->dmFields & DM_PELSHEIGHT ? devmode->dmPelsHeight : 0),
          bpp,
          (devmode->dmFields & DM_DISPLAYFREQUENCY ? devmode->dmDisplayFrequency : 0));
    if (devmode->dmFields & DM_DISPLAYFIXEDOUTPUT)
        TRACE(" %sstretched", devmode->dmDisplayFixedOutput == DMDFO_STRETCH ? "" : "un");
    if (devmode->dmFields & DM_DISPLAYFLAGS)
        TRACE(" %sinterlaced", devmode->dmDisplayFlags & DM_INTERLACED ? "" : "non-");
    TRACE("\n");

    desc = create_original_display_mode_descriptor(displays[0].displayID);

    safe = -1;
    best_display_mode = NULL;
    count = CFArrayGetCount(display_modes);
    for (i = 0; i < count; i++)
    {
        CGDisplayModeRef display_mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(display_modes, i);
        BOOL is_original = display_mode_matches_descriptor(display_mode, desc);
        uint32_t io_flags = CGDisplayModeGetIOFlags(display_mode);
        int mode_bpp = display_mode_bits_per_pixel(display_mode);
        size_t width = CGDisplayModeGetWidth(display_mode);
        size_t height = CGDisplayModeGetHeight(display_mode);

        if (is_original && retina_enabled)
        {
            width *= 2;
            height *= 2;
        }

        if (!(io_flags & kDisplayModeValidFlag) || !(io_flags & kDisplayModeSafeFlag))
            continue;

        safe++;

        if (bpp != mode_bpp)
            continue;

        if (devmode->dmFields & DM_PELSWIDTH)
        {
            if (devmode->dmPelsWidth != width)
                continue;
        }
        if (devmode->dmFields & DM_PELSHEIGHT)
        {
            if (devmode->dmPelsHeight != height)
                continue;
        }
        if ((devmode->dmFields & DM_DISPLAYFREQUENCY) && devmode->dmDisplayFrequency != 0)
        {
            double refresh_rate = CGDisplayModeGetRefreshRate(display_mode);
            if (!refresh_rate)
                refresh_rate = 60;
            if (devmode->dmDisplayFrequency != (DWORD)refresh_rate)
                continue;
        }
        if (devmode->dmFields & DM_DISPLAYFLAGS)
        {
            if (!(devmode->dmDisplayFlags & DM_INTERLACED) != !(io_flags & kDisplayModeInterlacedFlag))
                continue;
        }
        else if (best_display_mode)
        {
            if (io_flags & kDisplayModeInterlacedFlag && !(best_io_flags & kDisplayModeInterlacedFlag))
                continue;
            else if (!(io_flags & kDisplayModeInterlacedFlag) && best_io_flags & kDisplayModeInterlacedFlag)
                goto better;
        }
        if (devmode->dmFields & DM_DISPLAYFIXEDOUTPUT)
        {
            if (!(devmode->dmDisplayFixedOutput == DMDFO_STRETCH) != !(io_flags & kDisplayModeStretchedFlag))
                continue;
        }
        else if (best_display_mode)
        {
            if (io_flags & kDisplayModeStretchedFlag && !(best_io_flags & kDisplayModeStretchedFlag))
                continue;
            else if (!(io_flags & kDisplayModeStretchedFlag) && best_io_flags & kDisplayModeStretchedFlag)
                goto better;
        }

        if (best_display_mode)
            continue;

better:
        best_display_mode = display_mode;
        best = safe;
        best_io_flags = io_flags;
        best_is_original = is_original;
    }

    if (best_display_mode)
    {
        /* we have a valid mode */
        TRACE("Requested display settings match mode %ld\n", best);

        if ((flags & CDS_UPDATEREGISTRY) && !write_registry_settings(devmode))
        {
            WARN("Failed to update registry\n");
            ret = DISP_CHANGE_NOTUPDATED;
        }
        else if (flags & (CDS_TEST | CDS_NORESET))
            ret = DISP_CHANGE_SUCCESSFUL;
        else if (macdrv_set_display_mode(&displays[0], best_display_mode))
        {
            int mode_bpp = display_mode_bits_per_pixel(best_display_mode);
            size_t width = CGDisplayModeGetWidth(best_display_mode);
            size_t height = CGDisplayModeGetHeight(best_display_mode);

            if (best_is_original && retina_enabled)
            {
                width *= 2;
                height *= 2;
            }

            SendMessageW(GetDesktopWindow(), WM_MACDRV_UPDATE_DESKTOP_RECT, mode_bpp,
                         MAKELPARAM(width, height));
            ret = DISP_CHANGE_SUCCESSFUL;
        }
        else
        {
            WARN("Failed to set display mode\n");
            ret = DISP_CHANGE_FAILED;
        }
    }
    else
    {
        /* no valid modes found */
        ERR("No matching mode found %ux%ux%d @%u!\n", devmode->dmPelsWidth, devmode->dmPelsHeight,
            bpp, devmode->dmDisplayFrequency);
    }

    free_display_mode_descriptor(desc);
    CFRelease(display_modes);
    macdrv_free_displays(displays);

    return ret;
}


/***********************************************************************
 *              EnumDisplayMonitors  (MACDRV.@)
 */
BOOL CDECL macdrv_EnumDisplayMonitors(HDC hdc, LPRECT rect, MONITORENUMPROC proc, LPARAM lparam)
{
    struct macdrv_display *displays;
    int num_displays;
    int i;
    BOOL ret = TRUE;

    TRACE("%p, %s, %p, %#lx\n", hdc, wine_dbgstr_rect(rect), proc, lparam);

    if (hdc)
    {
        POINT origin;
        RECT limit;

        if (!GetDCOrgEx(hdc, &origin)) return FALSE;
        if (GetClipBox(hdc, &limit) == ERROR) return FALSE;

        if (rect && !IntersectRect(&limit, &limit, rect)) return TRUE;

        if (macdrv_get_displays(&displays, &num_displays))
            return FALSE;

        for (i = 0; i < num_displays; i++)
        {
            RECT monrect = rect_from_cgrect(displays[i].frame);
            OffsetRect(&monrect, -origin.x, -origin.y);
            if (IntersectRect(&monrect, &monrect, &limit))
            {
                HMONITOR monitor = display_id_to_monitor(displays[i].displayID);
                TRACE("monitor %d handle %p @ %s\n", i, monitor, wine_dbgstr_rect(&monrect));
                if (!proc(monitor, hdc, &monrect, lparam))
                {
                    ret = FALSE;
                    break;
                }
            }
        }
    }
    else
    {
        if (macdrv_get_displays(&displays, &num_displays))
            return FALSE;

        for (i = 0; i < num_displays; i++)
        {
            RECT monrect = rect_from_cgrect(displays[i].frame);
            RECT unused;
            if (!rect || IntersectRect(&unused, &monrect, rect))
            {
                HMONITOR monitor = display_id_to_monitor(displays[i].displayID);
                TRACE("monitor %d handle %p @ %s\n", i, monitor, wine_dbgstr_rect(&monrect));
                if (!proc(monitor, 0, &monrect, lparam))
                {
                    ret = FALSE;
                    break;
                }
            }
        }
    }

    macdrv_free_displays(displays);

    return ret;
}


/***********************************************************************
 *              EnumDisplaySettingsEx  (MACDRV.@)
 *
 */
BOOL CDECL macdrv_EnumDisplaySettingsEx(LPCWSTR devname, DWORD mode,
                                        LPDEVMODEW devmode, DWORD flags)
{
    static const WCHAR dev_name[CCHDEVICENAME] =
        { 'W','i','n','e',' ','M','a','c',' ','d','r','i','v','e','r',0 };
    struct macdrv_display *displays = NULL;
    int num_displays;
    CGDisplayModeRef display_mode;
    int display_mode_bpp;
    BOOL synthesized = FALSE;
    double rotation;
    uint32_t io_flags;

    TRACE("%s, %u, %p + %hu, %08x\n", debugstr_w(devname), mode, devmode, devmode->dmSize, flags);

    init_original_display_mode();

    memcpy(devmode->dmDeviceName, dev_name, sizeof(dev_name));
    devmode->dmSpecVersion = DM_SPECVERSION;
    devmode->dmDriverVersion = DM_SPECVERSION;
    devmode->dmSize = FIELD_OFFSET(DEVMODEW, dmICMMethod);
    devmode->dmDriverExtra = 0;
    memset(&devmode->dmFields, 0, devmode->dmSize - FIELD_OFFSET(DEVMODEW, dmFields));

    if (mode == ENUM_REGISTRY_SETTINGS)
    {
        TRACE("mode %d (registry) -- getting default mode\n", mode);
        return read_registry_settings(devmode);
    }

    if (macdrv_get_displays(&displays, &num_displays))
        goto failed;

    if (mode == ENUM_CURRENT_SETTINGS)
    {
        TRACE("mode %d (current) -- getting current mode\n", mode);
        display_mode = CGDisplayCopyDisplayMode(displays[0].displayID);
        display_mode_bpp = display_mode_bits_per_pixel(display_mode);
    }
    else
    {
        DWORD count, i;

        EnterCriticalSection(&modes_section);

        if (mode == 0 || !modes)
        {
            if (modes) CFRelease(modes);
            modes = copy_display_modes(displays[0].displayID);
            modes_has_8bpp = modes_has_16bpp = FALSE;

            if (modes)
            {
                count = CFArrayGetCount(modes);
                for (i = 0; i < count && !(modes_has_8bpp && modes_has_16bpp); i++)
                {
                    CGDisplayModeRef mode = (CGDisplayModeRef)CFArrayGetValueAtIndex(modes, i);
                    int bpp = display_mode_bits_per_pixel(mode);
                    if (bpp == 8)
                        modes_has_8bpp = TRUE;
                    else if (bpp == 16)
                        modes_has_16bpp = TRUE;
                }
            }
        }

        display_mode = NULL;
        if (modes)
        {
            int default_bpp = get_default_bpp();
            DWORD seen_modes = 0;

            count = CFArrayGetCount(modes);
            for (i = 0; i < count; i++)
            {
                CGDisplayModeRef candidate = (CGDisplayModeRef)CFArrayGetValueAtIndex(modes, i);

                io_flags = CGDisplayModeGetIOFlags(candidate);
                if (!(flags & EDS_RAWMODE) &&
                    (!(io_flags & kDisplayModeValidFlag) || !(io_flags & kDisplayModeSafeFlag)))
                    continue;

                seen_modes++;
                if (seen_modes > mode)
                {
                    display_mode = (CGDisplayModeRef)CFRetain(candidate);
                    display_mode_bpp = display_mode_bits_per_pixel(display_mode);
                    break;
                }

                /* We only synthesize modes from those having the default bpp. */
                if (display_mode_bits_per_pixel(candidate) != default_bpp)
                    continue;

                if (!modes_has_8bpp)
                {
                    seen_modes++;
                    if (seen_modes > mode)
                    {
                        display_mode = (CGDisplayModeRef)CFRetain(candidate);
                        display_mode_bpp = 8;
                        synthesized = TRUE;
                        break;
                    }
                }

                if (!modes_has_16bpp)
                {
                    seen_modes++;
                    if (seen_modes > mode)
                    {
                        display_mode = (CGDisplayModeRef)CFRetain(candidate);
                        display_mode_bpp = 16;
                        synthesized = TRUE;
                        break;
                    }
                }
            }
        }

        LeaveCriticalSection(&modes_section);
    }

    if (!display_mode)
        goto failed;

    /* We currently only report modes for the primary display, so it's at (0, 0). */
    devmode->dmPosition.x = 0;
    devmode->dmPosition.y = 0;
    devmode->dmFields |= DM_POSITION;

    rotation = CGDisplayRotation(displays[0].displayID);
    devmode->dmDisplayOrientation = ((int)((rotation / 90) + 0.5)) % 4;
    devmode->dmFields |= DM_DISPLAYORIENTATION;

    io_flags = CGDisplayModeGetIOFlags(display_mode);
    if (io_flags & kDisplayModeStretchedFlag)
        devmode->dmDisplayFixedOutput = DMDFO_STRETCH;
    else
        devmode->dmDisplayFixedOutput = DMDFO_CENTER;
    devmode->dmFields |= DM_DISPLAYFIXEDOUTPUT;

    devmode->dmBitsPerPel = display_mode_bpp;
    if (devmode->dmBitsPerPel)
        devmode->dmFields |= DM_BITSPERPEL;

    devmode->dmPelsWidth = CGDisplayModeGetWidth(display_mode);
    devmode->dmPelsHeight = CGDisplayModeGetHeight(display_mode);
    if (retina_enabled)
    {
        struct display_mode_descriptor* desc = create_original_display_mode_descriptor(displays[0].displayID);
        if (display_mode_matches_descriptor(display_mode, desc))
        {
            devmode->dmPelsWidth *= 2;
            devmode->dmPelsHeight *= 2;
        }
        free_display_mode_descriptor(desc);
    }
    devmode->dmFields |= DM_PELSWIDTH | DM_PELSHEIGHT;

    devmode->dmDisplayFlags = 0;
    if (io_flags & kDisplayModeInterlacedFlag)
        devmode->dmDisplayFlags |= DM_INTERLACED;
    devmode->dmFields |= DM_DISPLAYFLAGS;

    devmode->dmDisplayFrequency = CGDisplayModeGetRefreshRate(display_mode);
    if (!devmode->dmDisplayFrequency)
        devmode->dmDisplayFrequency = 60;
    devmode->dmFields |= DM_DISPLAYFREQUENCY;

    CFRelease(display_mode);
    macdrv_free_displays(displays);

    TRACE("mode %d -- %dx%dx%dbpp @%d Hz", mode,
          devmode->dmPelsWidth, devmode->dmPelsHeight, devmode->dmBitsPerPel,
          devmode->dmDisplayFrequency);
    if (devmode->dmDisplayOrientation)
        TRACE(" rotated %u degrees", devmode->dmDisplayOrientation * 90);
    if (devmode->dmDisplayFixedOutput == DMDFO_STRETCH)
        TRACE(" stretched");
    if (devmode->dmDisplayFlags & DM_INTERLACED)
        TRACE(" interlaced");
    if (synthesized)
        TRACE(" (synthesized)");
    TRACE("\n");

    return TRUE;

failed:
    TRACE("mode %d -- not present\n", mode);
    if (displays) macdrv_free_displays(displays);
    SetLastError(ERROR_NO_MORE_FILES);
    return FALSE;
}


/***********************************************************************
 *              GetDeviceGammaRamp (MACDRV.@)
 */
BOOL macdrv_GetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
{
    BOOL ret = FALSE;
    DDGAMMARAMP *r = ramp;
    struct macdrv_display *displays;
    int num_displays;
    uint32_t mac_entries;
    int win_entries = sizeof(r->red) / sizeof(r->red[0]);
    CGGammaValue *red, *green, *blue;
    CGError err;
    int win_entry;

    TRACE("dev %p ramp %p\n", dev, ramp);

    if (macdrv_get_displays(&displays, &num_displays))
    {
        WARN("failed to get Mac displays\n");
        return FALSE;
    }

    mac_entries = CGDisplayGammaTableCapacity(displays[0].displayID);
    red = HeapAlloc(GetProcessHeap(), 0, mac_entries * sizeof(red[0]) * 3);
    if (!red)
        goto done;
    green = red + mac_entries;
    blue = green + mac_entries;

    err = CGGetDisplayTransferByTable(displays[0].displayID, mac_entries, red, green,
                                      blue, &mac_entries);
    if (err != kCGErrorSuccess)
    {
        WARN("failed to get Mac gamma table: %d\n", err);
        goto done;
    }

    if (mac_entries == win_entries)
    {
        for (win_entry = 0; win_entry < win_entries; win_entry++)
        {
            r->red[win_entry]   = red[win_entry]   * 65535 + 0.5;
            r->green[win_entry] = green[win_entry] * 65535 + 0.5;
            r->blue[win_entry]  = blue[win_entry]  * 65535 + 0.5;
        }
    }
    else
    {
        for (win_entry = 0; win_entry < win_entries; win_entry++)
        {
            double mac_pos = win_entry * (mac_entries - 1) / (double)(win_entries - 1);
            int mac_entry = mac_pos;
            double red_value, green_value, blue_value;

            if (mac_entry == mac_entries - 1)
            {
                red_value   = red[mac_entry];
                green_value = green[mac_entry];
                blue_value  = blue[mac_entry];
            }
            else
            {
                double distance = mac_pos - mac_entry;

                red_value   = red[mac_entry]   * (1 - distance) + red[mac_entry + 1]   * distance;
                green_value = green[mac_entry] * (1 - distance) + green[mac_entry + 1] * distance;
                blue_value  = blue[mac_entry]  * (1 - distance) + blue[mac_entry + 1]  * distance;
            }

            r->red[win_entry]   = red_value   * 65535 + 0.5;
            r->green[win_entry] = green_value * 65535 + 0.5;
            r->blue[win_entry]  = blue_value  * 65535 + 0.5;
        }
    }

    ret = TRUE;

done:
    HeapFree(GetProcessHeap(), 0, red);
    macdrv_free_displays(displays);
    return ret;
}


/***********************************************************************
 *              GetMonitorInfo  (MACDRV.@)
 */
BOOL CDECL macdrv_GetMonitorInfo(HMONITOR monitor, LPMONITORINFO info)
{
    static const WCHAR adapter_name[] = { '\\','\\','.','\\','D','I','S','P','L','A','Y','1',0 };
    struct macdrv_display *displays;
    int num_displays;
    CGDirectDisplayID display_id;
    int i;

    TRACE("%p, %p\n", monitor, info);

    if (macdrv_get_displays(&displays, &num_displays))
    {
        ERR("couldn't get display list\n");
        SetLastError(ERROR_GEN_FAILURE);
        return FALSE;
    }

    display_id = monitor_to_display_id(monitor);
    for (i = 0; i < num_displays; i++)
    {
        if (displays[i].displayID == display_id)
            break;
    }

    if (i < num_displays)
    {
        info->rcMonitor = rect_from_cgrect(displays[i].frame);
        info->rcWork    = rect_from_cgrect(displays[i].work_frame);

        info->dwFlags = (i == 0) ? MONITORINFOF_PRIMARY : 0;

        if (info->cbSize >= sizeof(MONITORINFOEXW))
            lstrcpyW(((MONITORINFOEXW*)info)->szDevice, adapter_name);

        TRACE(" -> rcMonitor %s rcWork %s dwFlags %08x\n", wine_dbgstr_rect(&info->rcMonitor),
              wine_dbgstr_rect(&info->rcWork), info->dwFlags);
    }
    else
    {
        ERR("invalid monitor handle\n");
        SetLastError(ERROR_INVALID_HANDLE);
    }

    macdrv_free_displays(displays);
    return (i < num_displays);
}


/***********************************************************************
 *              SetDeviceGammaRamp (MACDRV.@)
 */
BOOL macdrv_SetDeviceGammaRamp(PHYSDEV dev, LPVOID ramp)
{
    DDGAMMARAMP *r = ramp;
    struct macdrv_display *displays;
    int num_displays;
    int win_entries = sizeof(r->red) / sizeof(r->red[0]);
    CGGammaValue *red, *green, *blue;
    int i;
    CGError err = kCGErrorFailure;

    TRACE("dev %p ramp %p\n", dev, ramp);

    if (!allow_set_gamma)
    {
        TRACE("disallowed by registry setting\n");
        return FALSE;
    }

    if (macdrv_get_displays(&displays, &num_displays))
    {
        WARN("failed to get Mac displays\n");
        return FALSE;
    }

    red = HeapAlloc(GetProcessHeap(), 0, win_entries * sizeof(red[0]) * 3);
    if (!red)
        goto done;
    green = red + win_entries;
    blue = green + win_entries;

    for (i = 0; i < win_entries; i++)
    {
        red[i]      = r->red[i] / 65535.0;
        green[i]    = r->green[i] / 65535.0;
        blue[i]     = r->blue[i] / 65535.0;
    }

    err = CGSetDisplayTransferByTable(displays[0].displayID, win_entries, red, green, blue);
    if (err != kCGErrorSuccess)
        WARN("failed to set display gamma table: %d\n", err);

done:
    HeapFree(GetProcessHeap(), 0, red);
    macdrv_free_displays(displays);
    return (err == kCGErrorSuccess);
}


/***********************************************************************
 *              macdrv_displays_changed
 *
 * Handler for DISPLAYS_CHANGED events.
 */
void macdrv_displays_changed(const macdrv_event *event)
{
    HWND hwnd = GetDesktopWindow();

    /* A system display change will get delivered to all GUI-attached threads,
       so the desktop-window-owning thread will get it and all others should
       ignore it.  A synthesized display change event due to activation
       will only get delivered to the activated process.  So, it needs to
       process it (by sending it to the desktop window). */
    if (event->displays_changed.activating ||
        GetWindowThreadProcessId(hwnd, NULL) == GetCurrentThreadId())
    {
        CGDirectDisplayID mainDisplay = CGMainDisplayID();
        CGDisplayModeRef mode = CGDisplayCopyDisplayMode(mainDisplay);
        size_t width = CGDisplayModeGetWidth(mode);
        size_t height = CGDisplayModeGetHeight(mode);
        int mode_bpp = display_mode_bits_per_pixel(mode);
        struct display_mode_descriptor* desc = create_original_display_mode_descriptor(mainDisplay);
        BOOL is_original = display_mode_matches_descriptor(mode, desc);

        free_display_mode_descriptor(desc);
        CGDisplayModeRelease(mode);

        if (is_original && retina_enabled)
        {
            width *= 2;
            height *= 2;
        }

        SendMessageW(hwnd, WM_MACDRV_UPDATE_DESKTOP_RECT, mode_bpp,
                     MAKELPARAM(width, height));
    }
}