JUCE/modules/juce_gui_basics/native/juce_linux_X11_Windowing.cpp

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

#if JUCE_DEBUG && ! defined (JUCE_DEBUG_XERRORS)
 #define JUCE_DEBUG_XERRORS 1
#endif

#if JUCE_MODULE_AVAILABLE_juce_gui_extra
 #define JUCE_X11_SUPPORTS_XEMBED 1
#else
 #define JUCE_X11_SUPPORTS_XEMBED 0
#endif

#if JUCE_X11_SUPPORTS_XEMBED
bool juce_handleXEmbedEvent (ComponentPeer*, void*);
unsigned long juce_getCurrentFocusWindow (ComponentPeer*);
#endif

extern WindowMessageReceiveCallback dispatchWindowMessage;

extern XContext windowHandleXContext;

//=============================== X11 - Keys ===================================

namespace Keys
{
    enum MouseButtons
    {
        NoButton = 0,
        LeftButton = 1,
        MiddleButton = 2,
        RightButton = 3,
        WheelUp = 4,
        WheelDown = 5
    };

    static int AltMask = 0;
    static int NumLockMask = 0;
    static bool numLock = false;
    static bool capsLock = false;
    static char keyStates [32];
    static const int extendedKeyModifier = 0x10000000;
}

bool KeyPress::isKeyCurrentlyDown (int keyCode)
{
    ScopedXDisplay xDisplay;

    if (auto display = xDisplay.display)
    {
        int keysym;

        if (keyCode & Keys::extendedKeyModifier)
        {
            keysym = 0xff00 | (keyCode & 0xff);
        }
        else
        {
            keysym = keyCode;

            if (keysym == (XK_Tab & 0xff)
                || keysym == (XK_Return & 0xff)
                || keysym == (XK_Escape & 0xff)
                || keysym == (XK_BackSpace & 0xff))
            {
                keysym |= 0xff00;
            }
        }

        ScopedXLock xlock (display);

        const int keycode = XKeysymToKeycode (display, (KeySym) keysym);
        const int keybyte = keycode >> 3;
        const int keybit = (1 << (keycode & 7));

        return (Keys::keyStates [keybyte] & keybit) != 0;
    }

    return false;
}

//==============================================================================

const int KeyPress::spaceKey                = XK_space & 0xff;
const int KeyPress::returnKey               = XK_Return & 0xff;
const int KeyPress::escapeKey               = XK_Escape & 0xff;
const int KeyPress::backspaceKey            = XK_BackSpace & 0xff;
const int KeyPress::leftKey                 = (XK_Left & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::rightKey                = (XK_Right & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::upKey                   = (XK_Up & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::downKey                 = (XK_Down & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::pageUpKey               = (XK_Page_Up & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::pageDownKey             = (XK_Page_Down & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::endKey                  = (XK_End & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::homeKey                 = (XK_Home & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::insertKey               = (XK_Insert & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::deleteKey               = (XK_Delete & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::tabKey                  = XK_Tab & 0xff;
const int KeyPress::F1Key                   = (XK_F1 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F2Key                   = (XK_F2 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F3Key                   = (XK_F3 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F4Key                   = (XK_F4 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F5Key                   = (XK_F5 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F6Key                   = (XK_F6 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F7Key                   = (XK_F7 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F8Key                   = (XK_F8 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F9Key                   = (XK_F9 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F10Key                  = (XK_F10 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F11Key                  = (XK_F11 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F12Key                  = (XK_F12 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F13Key                  = (XK_F13 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F14Key                  = (XK_F14 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F15Key                  = (XK_F15 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F16Key                  = (XK_F16 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F17Key                  = (XK_F17 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F18Key                  = (XK_F18 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F19Key                  = (XK_F19 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F20Key                  = (XK_F20 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F21Key                  = (XK_F21 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F22Key                  = (XK_F22 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F23Key                  = (XK_F23 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F24Key                  = (XK_F24 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F25Key                  = (XK_F25 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F26Key                  = (XK_F26 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F27Key                  = (XK_F27 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F28Key                  = (XK_F28 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F29Key                  = (XK_F29 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F30Key                  = (XK_F30 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F31Key                  = (XK_F31 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F32Key                  = (XK_F32 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F33Key                  = (XK_F33 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F34Key                  = (XK_F34 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::F35Key                  = (XK_F35 & 0xff) | Keys::extendedKeyModifier;

const int KeyPress::numberPad0              = (XK_KP_0 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad1              = (XK_KP_1 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad2              = (XK_KP_2 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad3              = (XK_KP_3 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad4              = (XK_KP_4 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad5              = (XK_KP_5 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad6              = (XK_KP_6 & 0xff) | Keys::extendedKeyModifier;
const int KeyPress::numberPad7              = (XK_KP_7 & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPad8              = (XK_KP_8 & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPad9              = (XK_KP_9 & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadAdd            = (XK_KP_Add & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadSubtract       = (XK_KP_Subtract & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadMultiply       = (XK_KP_Multiply & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadDivide         = (XK_KP_Divide & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadSeparator      = (XK_KP_Separator & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadDecimalPoint   = (XK_KP_Decimal & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadEquals         = (XK_KP_Equal & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::numberPadDelete         = (XK_KP_Delete & 0xff)| Keys::extendedKeyModifier;
const int KeyPress::playKey                 = ((int) 0xffeeff00) | Keys::extendedKeyModifier;
const int KeyPress::stopKey                 = ((int) 0xffeeff01) | Keys::extendedKeyModifier;
const int KeyPress::fastForwardKey          = ((int) 0xffeeff02) | Keys::extendedKeyModifier;
const int KeyPress::rewindKey               = ((int) 0xffeeff03) | Keys::extendedKeyModifier;

//================================== X11 - Shm =================================

#if JUCE_USE_XSHM
namespace XSHMHelpers
{
    static int trappedErrorCode = 0;

    extern "C" int errorTrapHandler (Display*, XErrorEvent* err)
    {
        trappedErrorCode = err->error_code;
        return 0;
    }

    static bool isShmAvailable (::Display* display) noexcept
    {
        static bool isChecked = false;
        static bool isAvailable = false;

        if (! isChecked)
        {
            isChecked = true;

            if (display != nullptr)
            {
                int major, minor;
                Bool pixmaps;

                ScopedXLock xlock (display);

                if (XShmQueryVersion (display, &major, &minor, &pixmaps))
                {
                    trappedErrorCode = 0;
                    XErrorHandler oldHandler = XSetErrorHandler (errorTrapHandler);

                    XShmSegmentInfo segmentInfo;
                    zerostruct (segmentInfo);

                    if (auto* xImage = XShmCreateImage (display, DefaultVisual (display, DefaultScreen (display)),
                                                        24, ZPixmap, nullptr, &segmentInfo, 50, 50))
                    {
                        if ((segmentInfo.shmid = shmget (IPC_PRIVATE,
                                                         (size_t) (xImage->bytes_per_line * xImage->height),
                                                         IPC_CREAT | 0777)) >= 0)
                        {
                            segmentInfo.shmaddr = (char*) shmat (segmentInfo.shmid, nullptr, 0);

                            if (segmentInfo.shmaddr != (void*) -1)
                            {
                                segmentInfo.readOnly = False;
                                xImage->data = segmentInfo.shmaddr;
                                XSync (display, False);

                                if (XShmAttach (display, &segmentInfo) != 0)
                                {
                                    XSync (display, False);
                                    XShmDetach (display, &segmentInfo);

                                    isAvailable = true;
                                }
                            }

                            XFlush (display);
                            XDestroyImage (xImage);

                            shmdt (segmentInfo.shmaddr);
                        }

                        shmctl (segmentInfo.shmid, IPC_RMID, nullptr);

                        XSetErrorHandler (oldHandler);
                        if (trappedErrorCode != 0)
                            isAvailable = false;
                    }
                }
            }
        }

        return isAvailable;
    }
}
#endif

//=============================== X11 - Render =================================

#if JUCE_USE_XRENDER
namespace XRender
{
    typedef Status (*tXRenderQueryVersion) (Display*, int*, int*);
    typedef XRenderPictFormat* (*tXRenderFindStandardFormat) (Display*, int);
    typedef XRenderPictFormat* (*tXRenderFindFormat) (Display*, unsigned long, XRenderPictFormat*, int);
    typedef XRenderPictFormat* (*tXRenderFindVisualFormat) (Display*, Visual*);

    static tXRenderQueryVersion xRenderQueryVersion = nullptr;
    static tXRenderFindStandardFormat xRenderFindStandardFormat = nullptr;
    static tXRenderFindFormat xRenderFindFormat = nullptr;
    static tXRenderFindVisualFormat xRenderFindVisualFormat = nullptr;

    static bool isAvailable (::Display* display)
    {
        static bool hasLoaded = false;

        if (! hasLoaded)
        {
            if (display != nullptr)
            {
                hasLoaded = true;

                ScopedXLock xlock (display);

                if (void* h = dlopen ("libXrender.so.1", RTLD_GLOBAL | RTLD_NOW))
                {
                    xRenderQueryVersion         = (tXRenderQueryVersion)        dlsym (h, "XRenderQueryVersion");
                    xRenderFindStandardFormat   = (tXRenderFindStandardFormat)  dlsym (h, "XRenderFindStandardFormat");
                    xRenderFindFormat           = (tXRenderFindFormat)          dlsym (h, "XRenderFindFormat");
                    xRenderFindVisualFormat     = (tXRenderFindVisualFormat)    dlsym (h, "XRenderFindVisualFormat");
                }

                if (xRenderQueryVersion != nullptr
                     && xRenderFindStandardFormat != nullptr
                     && xRenderFindFormat != nullptr
                     && xRenderFindVisualFormat != nullptr)
                {
                    int major, minor;
                    if (xRenderQueryVersion (display, &major, &minor))
                        return true;
                }
            }

            xRenderQueryVersion = nullptr;
        }

        return xRenderQueryVersion != nullptr;
    }

    static bool hasCompositingWindowManager (::Display* display) noexcept
    {
        return display != nullptr
                && XGetSelectionOwner (display, Atoms::getCreating (display, "_NET_WM_CM_S0")) != 0;
    }

    static XRenderPictFormat* findPictureFormat (::Display* display)
    {
        ScopedXLock xlock (display);
        XRenderPictFormat* pictFormat = nullptr;

        if (isAvailable (display))
        {
            pictFormat = xRenderFindStandardFormat (display, PictStandardARGB32);

            if (pictFormat == nullptr)
            {
                XRenderPictFormat desiredFormat;
                desiredFormat.type = PictTypeDirect;
                desiredFormat.depth = 32;

                desiredFormat.direct.alphaMask = 0xff;
                desiredFormat.direct.redMask   = 0xff;
                desiredFormat.direct.greenMask = 0xff;
                desiredFormat.direct.blueMask  = 0xff;

                desiredFormat.direct.alpha = 24;
                desiredFormat.direct.red   = 16;
                desiredFormat.direct.green = 8;
                desiredFormat.direct.blue  = 0;

                pictFormat = xRenderFindFormat (display,
                                                PictFormatType | PictFormatDepth
                                                 | PictFormatRedMask | PictFormatRed
                                                 | PictFormatGreenMask | PictFormatGreen
                                                 | PictFormatBlueMask | PictFormatBlue
                                                 | PictFormatAlphaMask | PictFormatAlpha,
                                                &desiredFormat,
                                                0);
            }
        }

        return pictFormat;
    }
}
#endif

//================================ X11 - Visuals ===============================

namespace Visuals
{
    static Visual* findVisualWithDepth (::Display* display, int desiredDepth) noexcept
    {
        ScopedXLock xlock (display);

        Visual* visual = nullptr;
        int numVisuals = 0;
        long desiredMask = VisualNoMask;
        XVisualInfo desiredVisual;

        desiredVisual.screen = DefaultScreen (display);
        desiredVisual.depth = desiredDepth;

        desiredMask = VisualScreenMask | VisualDepthMask;

        if (desiredDepth == 32)
        {
            desiredVisual.c_class    = TrueColor;
            desiredVisual.red_mask   = 0x00FF0000;
            desiredVisual.green_mask = 0x0000FF00;
            desiredVisual.blue_mask  = 0x000000FF;
            desiredVisual.bits_per_rgb = 8;

            desiredMask |= VisualClassMask;
            desiredMask |= VisualRedMaskMask;
            desiredMask |= VisualGreenMaskMask;
            desiredMask |= VisualBlueMaskMask;
            desiredMask |= VisualBitsPerRGBMask;
        }

        if (auto* xvinfos = XGetVisualInfo (display, desiredMask, &desiredVisual, &numVisuals))
        {
            for (int i = 0; i < numVisuals; i++)
            {
                if (xvinfos[i].depth == desiredDepth)
                {
                    visual = xvinfos[i].visual;
                    break;
                }
            }

            XFree (xvinfos);
        }

        return visual;
    }

    static Visual* findVisualFormat (::Display* display, int desiredDepth, int& matchedDepth) noexcept
    {
        Visual* visual = nullptr;

        if (desiredDepth == 32)
        {
           #if JUCE_USE_XSHM
            if (XSHMHelpers::isShmAvailable (display))
            {
               #if JUCE_USE_XRENDER
                if (XRender::isAvailable (display))
                {
                    if (auto pictFormat = XRender::findPictureFormat (display))
                    {
                        int numVisuals = 0;
                        XVisualInfo desiredVisual;
                        desiredVisual.screen = DefaultScreen (display);
                        desiredVisual.depth = 32;
                        desiredVisual.bits_per_rgb = 8;

                        if (auto xvinfos = XGetVisualInfo (display,
                                                           VisualScreenMask | VisualDepthMask | VisualBitsPerRGBMask,
                                                           &desiredVisual, &numVisuals))
                        {
                            for (int i = 0; i < numVisuals; ++i)
                            {
                                auto pictVisualFormat = XRender::xRenderFindVisualFormat (display, xvinfos[i].visual);

                                if (pictVisualFormat != nullptr
                                     && pictVisualFormat->type == PictTypeDirect
                                     && pictVisualFormat->direct.alphaMask)
                                {
                                    visual = xvinfos[i].visual;
                                    matchedDepth = 32;
                                    break;
                                }
                            }

                            XFree (xvinfos);
                        }
                    }
                }
               #endif
                if (visual == nullptr)
                {
                    visual = findVisualWithDepth (display, 32);

                    if (visual != nullptr)
                        matchedDepth = 32;
                }
            }
           #endif
        }

        if (visual == nullptr && desiredDepth >= 24)
        {
            visual = findVisualWithDepth (display, 24);

            if (visual != nullptr)
                matchedDepth = 24;
        }

        if (visual == nullptr && desiredDepth >= 16)
        {
            visual = findVisualWithDepth (display, 16);

            if (visual != nullptr)
                matchedDepth = 16;
        }

        return visual;
    }
}

//================================= X11 - Bitmap ===============================

class XBitmapImage  : public ImagePixelData
{
public:
    XBitmapImage (::Display* d, Image::PixelFormat format, int w, int h,
                  bool clearImage, unsigned int imageDepth_, Visual* visual)
        : ImagePixelData (format, w, h),
          imageDepth (imageDepth_),
          display (d)
    {
        jassert (format == Image::RGB || format == Image::ARGB);

        pixelStride = (format == Image::RGB) ? 3 : 4;
        lineStride = ((w * pixelStride + 3) & ~3);

        ScopedXLock xlock (display);

       #if JUCE_USE_XSHM
        usingXShm = false;

        if ((imageDepth > 16) && XSHMHelpers::isShmAvailable (display))
        {
            zerostruct (segmentInfo);

            segmentInfo.shmid = -1;
            segmentInfo.shmaddr = (char *) -1;
            segmentInfo.readOnly = False;

            xImage = XShmCreateImage (display, visual, imageDepth, ZPixmap, nullptr,
                                      &segmentInfo, (unsigned int) w, (unsigned int) h);

            if (xImage != nullptr)
            {
                if ((segmentInfo.shmid = shmget (IPC_PRIVATE,
                                                 (size_t) (xImage->bytes_per_line * xImage->height),
                                                 IPC_CREAT | 0777)) >= 0)
                {
                    if (segmentInfo.shmid != -1)
                    {
                        segmentInfo.shmaddr = (char*) shmat (segmentInfo.shmid, nullptr, 0);

                        if (segmentInfo.shmaddr != (void*) -1)
                        {
                            segmentInfo.readOnly = False;

                            xImage->data = segmentInfo.shmaddr;
                            imageData = (uint8*) segmentInfo.shmaddr;

                            if (XShmAttach (display, &segmentInfo) != 0)
                                usingXShm = true;
                            else
                                jassertfalse;
                        }
                        else
                        {
                            shmctl (segmentInfo.shmid, IPC_RMID, nullptr);
                        }
                    }
                }
            }
        }

        if (! isUsingXShm())
       #endif
        {
            imageDataAllocated.allocate ((size_t) (lineStride * h), format == Image::ARGB && clearImage);
            imageData = imageDataAllocated;

            xImage = (XImage*) ::calloc (1, sizeof (XImage));

            xImage->width = w;
            xImage->height = h;
            xImage->xoffset = 0;
            xImage->format = ZPixmap;
            xImage->data = (char*) imageData;
            xImage->byte_order = ImageByteOrder (display);
            xImage->bitmap_unit = BitmapUnit (display);
            xImage->bitmap_bit_order = BitmapBitOrder (display);
            xImage->bitmap_pad = 32;
            xImage->depth = pixelStride * 8;
            xImage->bytes_per_line = lineStride;
            xImage->bits_per_pixel = pixelStride * 8;
            xImage->red_mask   = 0x00FF0000;
            xImage->green_mask = 0x0000FF00;
            xImage->blue_mask  = 0x000000FF;

            if (imageDepth == 16)
            {
                const int pixStride = 2;
                const int stride = ((w * pixStride + 3) & ~3);

                imageData16Bit.malloc (stride * h);
                xImage->data = imageData16Bit;
                xImage->bitmap_pad = 16;
                xImage->depth = pixStride * 8;
                xImage->bytes_per_line = stride;
                xImage->bits_per_pixel = pixStride * 8;
                xImage->red_mask   = visual->red_mask;
                xImage->green_mask = visual->green_mask;
                xImage->blue_mask  = visual->blue_mask;
            }

            if (! XInitImage (xImage))
                jassertfalse;
        }
    }

    ~XBitmapImage() override
    {
        ScopedXLock xlock (display);

        if (gc != None)
            XFreeGC (display, gc);

       #if JUCE_USE_XSHM
        if (isUsingXShm())
        {
            XShmDetach (display, &segmentInfo);

            XFlush (display);
            XDestroyImage (xImage);

            shmdt (segmentInfo.shmaddr);
            shmctl (segmentInfo.shmid, IPC_RMID, nullptr);
        }
        else
       #endif
        {
            xImage->data = nullptr;
            XDestroyImage (xImage);
        }
    }

    std::unique_ptr<LowLevelGraphicsContext> createLowLevelContext() override
    {
        sendDataChangeMessage();
        return std::make_unique<LowLevelGraphicsSoftwareRenderer> (Image (this));
    }

    void initialiseBitmapData (Image::BitmapData& bitmap, int x, int y,
                               Image::BitmapData::ReadWriteMode mode) override
    {
        bitmap.data = imageData + x * pixelStride + y * lineStride;
        bitmap.pixelFormat = pixelFormat;
        bitmap.lineStride = lineStride;
        bitmap.pixelStride = pixelStride;

        if (mode != Image::BitmapData::readOnly)
            sendDataChangeMessage();
    }

    ImagePixelData::Ptr clone() override
    {
        jassertfalse;
        return nullptr;
    }

    std::unique_ptr<ImageType> createType() const override     { return std::make_unique<NativeImageType>(); }

    void blitToWindow (Window window, int dx, int dy,
                       unsigned int dw, unsigned int dh, int sx, int sy)
    {
        ScopedXLock xlock (display);

        if (gc == None)
        {
            XGCValues gcvalues;
            gcvalues.foreground = None;
            gcvalues.background = None;
            gcvalues.function = GXcopy;
            gcvalues.plane_mask = AllPlanes;
            gcvalues.clip_mask = None;
            gcvalues.graphics_exposures = False;

            gc = XCreateGC (display, window,
                            GCBackground | GCForeground | GCFunction | GCPlaneMask | GCClipMask | GCGraphicsExposures,
                            &gcvalues);
        }

        if (imageDepth == 16)
        {
            auto rMask   = (uint32) xImage->red_mask;
            auto gMask   = (uint32) xImage->green_mask;
            auto bMask   = (uint32) xImage->blue_mask;
            auto rShiftL = (uint32) jmax (0,  getShiftNeeded (rMask));
            auto rShiftR = (uint32) jmax (0, -getShiftNeeded (rMask));
            auto gShiftL = (uint32) jmax (0,  getShiftNeeded (gMask));
            auto gShiftR = (uint32) jmax (0, -getShiftNeeded (gMask));
            auto bShiftL = (uint32) jmax (0,  getShiftNeeded (bMask));
            auto bShiftR = (uint32) jmax (0, -getShiftNeeded (bMask));

            const Image::BitmapData srcData (Image (this), Image::BitmapData::readOnly);

            for (int y = sy; y < sy + (int)dh; ++y)
            {
                const uint8* p = srcData.getPixelPointer (sx, y);

                for (int x = sx; x < sx + (int)dw; ++x)
                {
                    auto* pixel = (const PixelRGB*) p;
                    p += srcData.pixelStride;

                    XPutPixel (xImage, x, y,
                                   (((((uint32) pixel->getRed())   << rShiftL) >> rShiftR) & rMask)
                                 | (((((uint32) pixel->getGreen()) << gShiftL) >> gShiftR) & gMask)
                                 | (((((uint32) pixel->getBlue())  << bShiftL) >> bShiftR) & bMask));
                }
            }
        }

        // blit results to screen.
       #if JUCE_USE_XSHM
        if (isUsingXShm())
            XShmPutImage (display, (::Drawable) window, gc, xImage, sx, sy, dx, dy, dw, dh, True);
        else
       #endif
            XPutImage (display, (::Drawable) window, gc, xImage, sx, sy, dx, dy, dw, dh);
    }

    #if JUCE_USE_XSHM
    bool isUsingXShm() const noexcept       { return usingXShm; }
    #endif

private:
    //==============================================================================
    XImage* xImage = {};
    const unsigned int imageDepth;
    HeapBlock<uint8> imageDataAllocated;
    HeapBlock<char> imageData16Bit;
    int pixelStride, lineStride;
    uint8* imageData = {};
    GC gc = None;
    ::Display* display = {};

   #if JUCE_USE_XSHM
    XShmSegmentInfo segmentInfo;
    bool usingXShm;
   #endif

    static int getShiftNeeded (const uint32 mask) noexcept
    {
        for (int i = 32; --i >= 0;)
            if (((mask >> i) & 1) != 0)
                return i - 7;

        jassertfalse;
        return 0;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (XBitmapImage)
};

//==============================================================================
#if JUCE_USE_XINERAMA
static Array<XineramaScreenInfo> XineramaQueryDisplays (::Display* display)
{
    typedef Bool (*tXineramaIsActive) (::Display*);
    typedef XineramaScreenInfo* (*tXineramaQueryScreens) (::Display*, int*);

    int major_opcode, first_event, first_error;

    if (XQueryExtension (display, "XINERAMA", &major_opcode, &first_event, &first_error))
    {
        static void* libXinerama = nullptr;
        static tXineramaIsActive isActiveFuncPtr = nullptr;
        static tXineramaQueryScreens xineramaQueryScreens = nullptr;

        if (libXinerama == nullptr)
        {
            libXinerama = dlopen ("libXinerama.so", RTLD_GLOBAL | RTLD_NOW);

            if (libXinerama == nullptr)
                libXinerama = dlopen ("libXinerama.so.1", RTLD_GLOBAL | RTLD_NOW);

            if (libXinerama != nullptr)
            {
                isActiveFuncPtr = (tXineramaIsActive) dlsym (libXinerama, "XineramaIsActive");
                xineramaQueryScreens = (tXineramaQueryScreens) dlsym (libXinerama, "XineramaQueryScreens");
            }
        }

        if (isActiveFuncPtr != nullptr && xineramaQueryScreens != nullptr && isActiveFuncPtr (display) != 0)
        {
            int numScreens;

            if (auto* xinfo = xineramaQueryScreens (display, &numScreens))
            {
                Array<XineramaScreenInfo> infos (xinfo, numScreens);
                XFree (xinfo);

                return infos;
            }
        }
    }

    return {};
}
#endif

//==============================================================================
#if JUCE_USE_XRANDR
class XRandrWrapper
{
private:
    XRandrWrapper()
    {
        if (libXrandr == nullptr)
        {
            libXrandr = dlopen ("libXrandr.so", RTLD_GLOBAL | RTLD_NOW);

            if (libXrandr == nullptr)
                libXrandr = dlopen ("libXrandr.so.2", RTLD_GLOBAL | RTLD_NOW);

            if (libXrandr != nullptr)
            {
                getScreenResourcesPtr  = (tXRRGetScreenResources)  dlsym (libXrandr, "XRRGetScreenResources");
                freeScreenResourcesPtr = (tXRRFreeScreenResources) dlsym (libXrandr, "XRRFreeScreenResources");
                getOutputInfoPtr       = (tXRRGetOutputInfo)       dlsym (libXrandr, "XRRGetOutputInfo");
                freeOutputInfoPtr      = (tXRRFreeOutputInfo)      dlsym (libXrandr, "XRRFreeOutputInfo");
                getCrtcInfoPtr         = (tXRRGetCrtcInfo)         dlsym (libXrandr, "XRRGetCrtcInfo");
                freeCrtcInfoPtr        = (tXRRFreeCrtcInfo)        dlsym (libXrandr, "XRRFreeCrtcInfo");
                getOutputPrimaryPtr    = (tXRRGetOutputPrimary)    dlsym (libXrandr, "XRRGetOutputPrimary");
            }
        }
    }

public:
    //==============================================================================
    static XRandrWrapper& getInstance()
    {
        static XRandrWrapper xrandr;
        return xrandr;
    }

    //==============================================================================
    XRRScreenResources* getScreenResources (::Display* display, ::Window window)
    {
        if (getScreenResourcesPtr != nullptr)
            return getScreenResourcesPtr (display, window);

        return nullptr;
    }

    XRROutputInfo* getOutputInfo (::Display* display, XRRScreenResources* resources, RROutput output)
    {
        if (getOutputInfoPtr != nullptr)
            return getOutputInfoPtr (display, resources, output);

        return nullptr;
    }

    XRRCrtcInfo* getCrtcInfo (::Display* display, XRRScreenResources* resources, RRCrtc crtc)
    {
        if (getCrtcInfoPtr != nullptr)
            return getCrtcInfoPtr (display, resources, crtc);

        return nullptr;
    }

    RROutput getOutputPrimary (::Display* display, ::Window window)
    {
        if (getOutputPrimaryPtr != nullptr)
            return getOutputPrimaryPtr (display, window);

        return 0;
    }

    //==============================================================================
    void freeScreenResources (XRRScreenResources* ptr)
    {
        if (freeScreenResourcesPtr != nullptr)
            freeScreenResourcesPtr (ptr);
    }

    void freeOutputInfo (XRROutputInfo* ptr)
    {
        if (freeOutputInfoPtr != nullptr)
            freeOutputInfoPtr (ptr);
    }

    void freeCrtcInfo (XRRCrtcInfo* ptr)
    {
        if (freeCrtcInfoPtr != nullptr)
            freeCrtcInfoPtr (ptr);
    }

private:
    using tXRRGetScreenResources   = XRRScreenResources* (*) (::Display*, ::Window);
    using tXRRFreeScreenResources  = void (*) (XRRScreenResources*);
    using tXRRGetOutputInfo        = XRROutputInfo* (*) (::Display*, XRRScreenResources*, RROutput);
    using tXRRFreeOutputInfo       = void (*) (XRROutputInfo*);
    using tXRRGetCrtcInfo          = XRRCrtcInfo* (*) (::Display*, XRRScreenResources*, RRCrtc);
    using tXRRFreeCrtcInfo         = void (*) (XRRCrtcInfo*);
    using tXRRGetOutputPrimary     = RROutput (*) (::Display*, ::Window);

    void* libXrandr = nullptr;
    tXRRGetScreenResources getScreenResourcesPtr = nullptr;
    tXRRFreeScreenResources freeScreenResourcesPtr = nullptr;
    tXRRGetOutputInfo getOutputInfoPtr = nullptr;
    tXRRFreeOutputInfo freeOutputInfoPtr = nullptr;
    tXRRGetCrtcInfo getCrtcInfoPtr = nullptr;
    tXRRFreeCrtcInfo freeCrtcInfoPtr = nullptr;
    tXRRGetOutputPrimary getOutputPrimaryPtr = nullptr;
};
#endif


static double getDisplayDPI (::Display* display, int index)
{
    auto widthMM  = DisplayWidthMM  (display, index);
    auto heightMM = DisplayHeightMM (display, index);

    if (widthMM > 0 && heightMM > 0)
        return (((DisplayWidth (display, index) * 25.4) / widthMM) + ((DisplayHeight (display, index) * 25.4) / heightMM)) / 2.0;

    return 96.0;
}

static double getScaleForDisplay (const String& name, double dpi)
{
    if (name.isNotEmpty())
    {
        // Ubuntu and derived distributions now save a per-display scale factor as a configuration
        // variable. This can be changed in the Monitor system settings panel.
        ChildProcess dconf;

        if (File ("/usr/bin/dconf").existsAsFile()
            && dconf.start ("/usr/bin/dconf read /com/ubuntu/user-interface/scale-factor", ChildProcess::wantStdOut))
        {
            if (dconf.waitForProcessToFinish (200))
            {
                auto jsonOutput = dconf.readAllProcessOutput().replaceCharacter ('\'', '"');

                if (dconf.getExitCode() == 0 && jsonOutput.isNotEmpty())
                {
                    auto jsonVar = JSON::parse (jsonOutput);

                    if (auto* object = jsonVar.getDynamicObject())
                    {
                        auto scaleFactorVar = object->getProperty (name);

                        if (! scaleFactorVar.isVoid())
                        {
                            auto scaleFactor = ((double) scaleFactorVar) / 8.0;

                            if (scaleFactor > 0.0)
                                return scaleFactor;
                        }
                    }
                }
            }
        }
    }

    {
        // Other gnome based distros now use gsettings for a global scale factor
        ChildProcess gsettings;

        if (File ("/usr/bin/gsettings").existsAsFile()
            && gsettings.start ("/usr/bin/gsettings get org.gnome.desktop.interface scaling-factor", ChildProcess::wantStdOut))
        {
            if (gsettings.waitForProcessToFinish (200))
            {
                auto gsettingsOutput = StringArray::fromTokens (gsettings.readAllProcessOutput(), true);

                if (gsettingsOutput.size() >= 2 && gsettingsOutput[1].length() > 0)
                {
                    auto scaleFactor = gsettingsOutput[1].getDoubleValue();

                    if (scaleFactor > 0.0)
                        return scaleFactor;

                    return 1.0;
                }
            }
        }
    }

    // If no scale factor is set by GNOME or Ubuntu then calculate from monitor dpi
    // We use the same approach as chromium which simply divides the dpi by 96
    // and then rounds the result
    return round (dpi / 96.0);
}

//=============================== X11 - Pixmap =================================

namespace PixmapHelpers
{
    Pixmap createColourPixmapFromImage (::Display* display, const Image& image)
    {
        ScopedXLock xlock (display);

        auto width = (unsigned int) image.getWidth();
        auto height = (unsigned int) image.getHeight();
        HeapBlock<uint32> colour (width * height);
        int index = 0;

        for (int y = 0; y < (int)  height; ++y)
            for (int x = 0; x < (int) width; ++x)
                colour[index++] = image.getPixelAt (x, y).getARGB();

        XImage* ximage = XCreateImage (display, CopyFromParent, 24, ZPixmap,
                                       0, reinterpret_cast<char*> (colour.getData()),
                                       width, height, 32, 0);

        Pixmap pixmap = XCreatePixmap (display, DefaultRootWindow (display),
                                       width, height, 24);

        GC gc = XCreateGC (display, pixmap, 0, nullptr);
        XPutImage (display, pixmap, gc, ximage, 0, 0, 0, 0, width, height);
        XFreeGC (display, gc);
        XFree (ximage);

        return pixmap;
    }

    Pixmap createMaskPixmapFromImage (::Display* display, const Image& image)
    {
        ScopedXLock xlock (display);

        auto width = (unsigned int) image.getWidth();
        auto height = (unsigned int) image.getHeight();
        auto stride = (width + 7) >> 3;
        HeapBlock<char> mask;
        mask.calloc (stride * height);
        const bool msbfirst = (BitmapBitOrder (display) == MSBFirst);

        for (unsigned int y = 0; y < height; ++y)
        {
            for (unsigned int x = 0; x < width; ++x)
            {
                auto bit = (char) (1 << (msbfirst ? (7 - (x & 7)) : (x & 7)));
                const unsigned int offset = y * stride + (x >> 3);

                if (image.getPixelAt ((int) x, (int) y).getAlpha() >= 128)
                    mask[offset] |= bit;
            }
        }

        return XCreatePixmapFromBitmapData (display, DefaultRootWindow (display),
                                            mask.getData(), width, height, 1, 0, 1);
    }
}

static void* createDraggingHandCursor()
{
    static unsigned char dragHandData[] = { 71,73,70,56,57,97,16,0,16,0,145,2,0,0,0,0,255,255,255,0,
      0,0,0,0,0,33,249,4,1,0,0,2,0,44,0,0,0,0,16,0, 16,0,0,2,52,148,47,0,200,185,16,130,90,12,74,139,107,84,123,39,
      132,117,151,116,132,146,248,60,209,138,98,22,203,114,34,236,37,52,77,217, 247,154,191,119,110,240,193,128,193,95,163,56,60,234,98,135,2,0,59 };
    size_t dragHandDataSize = 99;

    return CustomMouseCursorInfo (ImageFileFormat::loadFrom (dragHandData, dragHandDataSize), { 8, 7 }).create();
}

//==============================================================================
static int numAlwaysOnTopPeers = 0;

bool juce_areThereAnyAlwaysOnTopWindows()
{
    return numAlwaysOnTopPeers > 0;
}

//==============================================================================
class LinuxComponentPeer  : public ComponentPeer
{
public:
    LinuxComponentPeer (Component& comp, int windowStyleFlags, Window parentToAddTo)
        : ComponentPeer (comp, windowStyleFlags),
          isAlwaysOnTop (comp.isAlwaysOnTop())
    {
        // it's dangerous to create a window on a thread other than the message thread..
        JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED

        display = XWindowSystem::getInstance()->displayRef();

        atoms.reset (new Atoms (display));
        dragState.reset (new DragState (display));
        repainter.reset (new LinuxRepaintManager (*this, display));

        if (isAlwaysOnTop)
            ++numAlwaysOnTopPeers;

        createWindow (parentToAddTo);

        setTitle (component.getName());

        getNativeRealtimeModifiers = []
        {
            ScopedXDisplay xDisplay;

            if (auto d = xDisplay.display)
            {
                Window root, child;
                int x, y, winx, winy;
                unsigned int mask;
                int mouseMods = 0;

                ScopedXLock xlock (d);

                if (XQueryPointer (d, RootWindow (d, DefaultScreen (d)),
                                   &root, &child, &x, &y, &winx, &winy, &mask) != False)
                {
                    if ((mask & Button1Mask) != 0)  mouseMods |= ModifierKeys::leftButtonModifier;
                    if ((mask & Button2Mask) != 0)  mouseMods |= ModifierKeys::middleButtonModifier;
                    if ((mask & Button3Mask) != 0)  mouseMods |= ModifierKeys::rightButtonModifier;
                }

                ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutMouseButtons().withFlags (mouseMods);
            }

            return ModifierKeys::currentModifiers;
        };
    }

    ~LinuxComponentPeer() override
    {
        // it's dangerous to delete a window on a thread other than the message thread..
        JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED

       #if JUCE_X11_SUPPORTS_XEMBED
        juce_handleXEmbedEvent (this, nullptr);
       #endif

        deleteIconPixmaps();
        destroyWindow();
        windowH = 0;

        if (isAlwaysOnTop)
            --numAlwaysOnTopPeers;

        // delete before display
        repainter = nullptr;

        display = XWindowSystem::getInstance()->displayUnref();
    }

    //==============================================================================
    void* getNativeHandle() const override
    {
        return (void*) windowH;
    }

    static LinuxComponentPeer* getPeerFor (Window windowHandle) noexcept
    {
        XPointer peer = nullptr;

        if (display != nullptr)
        {
            ScopedXLock xlock (display);

            if (! XFindContext (display, (XID) windowHandle, windowHandleXContext, &peer))
                if (peer != nullptr && ! ComponentPeer::isValidPeer (reinterpret_cast<LinuxComponentPeer*> (peer)))
                    peer = nullptr;
        }

        return reinterpret_cast<LinuxComponentPeer*> (peer);
    }

    void setVisible (bool shouldBeVisible) override
    {
        ScopedXLock xlock (display);

        if (shouldBeVisible)
            XMapWindow (display, windowH);
        else
            XUnmapWindow (display, windowH);
    }

    void setTitle (const String& title) override
    {
        XTextProperty nameProperty;
        char* strings[] = { const_cast<char*> (title.toRawUTF8()) };
        ScopedXLock xlock (display);

        if (XStringListToTextProperty (strings, 1, &nameProperty))
        {
            XSetWMName (display, windowH, &nameProperty);
            XSetWMIconName (display, windowH, &nameProperty);

            XFree (nameProperty.value);
        }
    }

    void updateScaleFactorFromNewBounds (const Rectangle<int>& newBounds, bool isPhysical)
    {
        Point<int> translation = (parentWindow != 0 ? getScreenPosition (isPhysical) : Point<int>());

        auto newScaleFactor = Desktop::getInstance().getDisplays().findDisplayForRect (newBounds.translated (translation.x, translation.y), isPhysical).scale
                                  / Desktop::getInstance().getGlobalScaleFactor();

        if (! approximatelyEqual (newScaleFactor, currentScaleFactor))
        {
            currentScaleFactor = newScaleFactor;
            scaleFactorListeners.call ([&] (ScaleFactorListener& l) { l.nativeScaleFactorChanged (currentScaleFactor); });
        }
    }

    void setBounds (const Rectangle<int>& newBounds, bool isNowFullScreen) override
    {
        if (fullScreen && ! isNowFullScreen)
        {
            // When transitioning back from fullscreen, we might need to remove
            // the FULLSCREEN window property
            Atom fs = Atoms::getIfExists (display, "_NET_WM_STATE_FULLSCREEN");

            if (fs != None)
            {
                Window root = RootWindow (display, DefaultScreen (display));

                XClientMessageEvent clientMsg;
                clientMsg.display = display;
                clientMsg.window = windowH;
                clientMsg.type = ClientMessage;
                clientMsg.format = 32;
                clientMsg.message_type = atoms->windowState;
                clientMsg.data.l[0] = 0;  // Remove
                clientMsg.data.l[1] = (long) fs;
                clientMsg.data.l[2] = 0;
                clientMsg.data.l[3] = 1;  // Normal Source

                ScopedXLock xlock (display);
                XSendEvent (display, root, false,
                            SubstructureRedirectMask | SubstructureNotifyMask,
                            (XEvent*) &clientMsg);
            }
        }

        fullScreen = isNowFullScreen;

        if (windowH != 0)
        {
            bounds = newBounds.withSize (jmax (1, newBounds.getWidth()),
                                         jmax (1, newBounds.getHeight()));

            updateScaleFactorFromNewBounds (bounds, false);

            auto physicalBounds = (parentWindow == 0 ? Desktop::getInstance().getDisplays().logicalToPhysical (bounds)
                                                     : bounds * currentScaleFactor);

            WeakReference<Component> deletionChecker (&component);
            ScopedXLock xlock (display);

            auto* hints = XAllocSizeHints();
            hints->flags  = USSize | USPosition;
            hints->x      = physicalBounds.getX();
            hints->y      = physicalBounds.getY();
            hints->width  = physicalBounds.getWidth();
            hints->height = physicalBounds.getHeight();

            if ((getStyleFlags() & windowIsResizable) == 0)
            {
                hints->min_width  = hints->max_width  = hints->width;
                hints->min_height = hints->max_height = hints->height;
                hints->flags |= PMinSize | PMaxSize;
            }

            XSetWMNormalHints (display, windowH, hints);
            XFree (hints);

            XMoveResizeWindow (display, windowH,
                               physicalBounds.getX() - windowBorder.getLeft(),
                               physicalBounds.getY() - windowBorder.getTop(),
                               (unsigned int) physicalBounds.getWidth(),
                               (unsigned int) physicalBounds.getHeight());

            if (deletionChecker != nullptr)
            {
                updateBorderSize();
                handleMovedOrResized();
            }
        }
    }

    Point<int> getScreenPosition (bool physical) const
    {
        auto screenBounds = (parentWindow == 0 ? bounds
                                               : bounds.translated (parentScreenPosition.x, parentScreenPosition.y));

        if (physical)
            return Desktop::getInstance().getDisplays().logicalToPhysical (screenBounds.getTopLeft());

        return screenBounds.getTopLeft();
    }

    Rectangle<int> getBounds() const override                            { return bounds; }

    using ComponentPeer::localToGlobal;
    Point<float> localToGlobal (Point<float> relativePosition) override  { return relativePosition + getScreenPosition (false).toFloat(); }

    using ComponentPeer::globalToLocal;
    Point<float> globalToLocal (Point<float> screenPosition) override    { return screenPosition   - getScreenPosition (false).toFloat(); }

    void setAlpha (float /* newAlpha */) override
    {
        //xxx todo!
    }

    StringArray getAvailableRenderingEngines() override
    {
        return StringArray ("Software Renderer");
    }

    void setMinimised (bool shouldBeMinimised) override
    {
        if (shouldBeMinimised)
        {
            Window root = RootWindow (display, DefaultScreen (display));

            XClientMessageEvent clientMsg;
            clientMsg.display = display;
            clientMsg.window = windowH;
            clientMsg.type = ClientMessage;
            clientMsg.format = 32;
            clientMsg.message_type = atoms->changeState;
            clientMsg.data.l[0] = IconicState;

            ScopedXLock xlock (display);
            XSendEvent (display, root, false, SubstructureRedirectMask | SubstructureNotifyMask, (XEvent*) &clientMsg);
        }
        else
        {
            setVisible (true);
        }
    }

    bool isMinimised() const override
    {
        ScopedXLock xlock (display);
        GetXProperty prop (display, windowH, atoms->state, 0, 64, false, atoms->state);

        if (prop.success && prop.actualType == atoms->state
            && prop.actualFormat == 32 && prop.numItems > 0)
        {
            unsigned long state;
            memcpy (&state, prop.data, sizeof (unsigned long));

            return state == IconicState;
        }

        return false;
    }

    void setFullScreen (bool shouldBeFullScreen) override
    {
        auto r = lastNonFullscreenBounds; // (get a copy of this before de-minimising)

        setMinimised (false);

        if (fullScreen != shouldBeFullScreen)
        {
            if (shouldBeFullScreen)
                r = Desktop::getInstance().getDisplays().getMainDisplay().userArea;

            if (! r.isEmpty())
                setBounds (ScalingHelpers::scaledScreenPosToUnscaled (component, r), shouldBeFullScreen);

            component.repaint();
        }
    }

    bool isFullScreen() const override
    {
        return fullScreen;
    }

    bool isChildWindowOf (Window possibleParent) const
    {
        Window* windowList = nullptr;
        uint32 windowListSize = 0;
        Window parent, root;

        ScopedXLock xlock (display);
        if (XQueryTree (display, windowH, &root, &parent, &windowList, &windowListSize) != 0)
        {
            if (windowList != nullptr)
                XFree (windowList);

            return parent == possibleParent;
        }

        return false;
    }

    bool isParentWindowOf (Window possibleChild) const
    {
        if (windowH != 0 && possibleChild != 0)
        {
            if (possibleChild == windowH)
                return true;

            Window* windowList = nullptr;
            uint32 windowListSize = 0;
            Window parent, root;

            ScopedXLock xlock (display);
            if (XQueryTree (display, possibleChild, &root, &parent, &windowList, &windowListSize) != 0)
            {
                if (windowList != nullptr)
                    XFree (windowList);

                if (parent == root)
                    return false;

                return isParentWindowOf (parent);
            }
        }

        return false;
    }

    bool isFrontWindow() const
    {
        Window* windowList = nullptr;
        uint32 windowListSize = 0;
        bool result = false;

        ScopedXLock xlock (display);
        Window parent, root = RootWindow (display, DefaultScreen (display));

        if (XQueryTree (display, root, &root, &parent, &windowList, &windowListSize) != 0)
        {
            for (int i = (int) windowListSize; --i >= 0;)
            {
                if (auto* peer = LinuxComponentPeer::getPeerFor (windowList[i]))
                {
                    result = (peer == this);
                    break;
                }
            }
        }

        if (windowList != nullptr)
            XFree (windowList);

        return result;
    }

    bool contains (Point<int> localPos, bool trueIfInAChildWindow) const override
    {
        if (! bounds.withZeroOrigin().contains (localPos))
            return false;

        for (int i = Desktop::getInstance().getNumComponents(); --i >= 0;)
        {
            auto* c = Desktop::getInstance().getComponent (i);

            if (c == &component)
                break;

            if (! c->isVisible())
                continue;

            if (auto* peer = c->getPeer())
                if (peer->contains (localPos + bounds.getPosition() - peer->getBounds().getPosition(), true))
                    return false;
        }

        if (trueIfInAChildWindow)
            return true;

        ::Window root, child;
        int wx, wy;
        unsigned int ww, wh, bw, bitDepth;

        ScopedXLock xlock (display);

        localPos *= currentScaleFactor;

        return XGetGeometry (display, (::Drawable) windowH, &root, &wx, &wy, &ww, &wh, &bw, &bitDepth)
                && XTranslateCoordinates (display, windowH, windowH, localPos.getX(), localPos.getY(), &wx, &wy, &child)
                && child == None;
    }

    BorderSize<int> getFrameSize() const override
    {
        return {};
    }

    bool setAlwaysOnTop (bool /* alwaysOnTop */) override
    {
        return false;
    }

    void toFront (bool makeActive) override
    {
        if (makeActive)
        {
            setVisible (true);
            grabFocus();
        }

        {
            ScopedXLock xlock (display);
            XEvent ev;
            ev.xclient.type = ClientMessage;
            ev.xclient.serial = 0;
            ev.xclient.send_event = True;
            ev.xclient.message_type = atoms->activeWin;
            ev.xclient.window = windowH;
            ev.xclient.format = 32;
            ev.xclient.data.l[0] = 2;
            ev.xclient.data.l[1] = getUserTime();
            ev.xclient.data.l[2] = 0;
            ev.xclient.data.l[3] = 0;
            ev.xclient.data.l[4] = 0;

            XSendEvent (display, RootWindow (display, DefaultScreen (display)),
                        False, SubstructureRedirectMask | SubstructureNotifyMask, &ev);

            XSync (display, False);
        }

        handleBroughtToFront();
    }

    void toBehind (ComponentPeer* other) override
    {
        if (auto* otherPeer = dynamic_cast<LinuxComponentPeer*> (other))
        {
            if (otherPeer->styleFlags & windowIsTemporary)
                return;

            setMinimised (false);

            Window newStack[] = { otherPeer->windowH, windowH };

            ScopedXLock xlock (display);
            XRestackWindows (display, newStack, 2);
        }
        else
            jassertfalse; // wrong type of window?
    }

    bool isFocused() const override
    {
        int revert = 0;
        Window focusedWindow = 0;
        ScopedXLock xlock (display);
        XGetInputFocus (display, &focusedWindow, &revert);

        if (focusedWindow == PointerRoot)
            return false;

        return isParentWindowOf (focusedWindow);
    }

    Window getFocusWindow()
    {
       #if JUCE_X11_SUPPORTS_XEMBED
        if (Window w = (Window) juce_getCurrentFocusWindow (this))
            return w;
       #endif

        return windowH;
    }

    void grabFocus() override
    {
        XWindowAttributes atts;
        ScopedXLock xlock (display);

        if (windowH != 0
            && XGetWindowAttributes (display, windowH, &atts)
            && atts.map_state == IsViewable
            && ! isFocused())
        {
            XSetInputFocus (display, getFocusWindow(), RevertToParent, (::Time) getUserTime());
            isActiveApplication = true;
        }
    }

    void textInputRequired (Point<int>, TextInputTarget&) override {}

    void repaint (const Rectangle<int>& area) override
    {
        repainter->repaint (area.getIntersection (bounds.withZeroOrigin()));
    }

    void performAnyPendingRepaintsNow() override
    {
        repainter->performAnyPendingRepaintsNow();
    }

    void setIcon (const Image& newIcon) override
    {
        const int dataSize = newIcon.getWidth() * newIcon.getHeight() + 2;
        HeapBlock<unsigned long> data (dataSize);

        int index = 0;
        data[index++] = (unsigned long) newIcon.getWidth();
        data[index++] = (unsigned long) newIcon.getHeight();

        for (int y = 0; y < newIcon.getHeight(); ++y)
            for (int x = 0; x < newIcon.getWidth(); ++x)
                data[index++] = (unsigned long) newIcon.getPixelAt (x, y).getARGB();

        ScopedXLock xlock (display);
        xchangeProperty (windowH, Atoms::getCreating (display, "_NET_WM_ICON"), XA_CARDINAL, 32, data.getData(), dataSize);

        deleteIconPixmaps();

        XWMHints* wmHints = XGetWMHints (display, windowH);

        if (wmHints == nullptr)
            wmHints = XAllocWMHints();

        wmHints->flags |= IconPixmapHint | IconMaskHint;
        wmHints->icon_pixmap = PixmapHelpers::createColourPixmapFromImage (display, newIcon);
        wmHints->icon_mask = PixmapHelpers::createMaskPixmapFromImage (display, newIcon);

        XSetWMHints (display, windowH, wmHints);
        XFree (wmHints);

        XSync (display, False);
    }

    void deleteIconPixmaps()
    {
        ScopedXLock xlock (display);

        if (auto* wmHints = XGetWMHints (display, windowH))
        {
            if ((wmHints->flags & IconPixmapHint) != 0)
            {
                wmHints->flags &= ~IconPixmapHint;
                XFreePixmap (display, wmHints->icon_pixmap);
            }

            if ((wmHints->flags & IconMaskHint) != 0)
            {
                wmHints->flags &= ~IconMaskHint;
                XFreePixmap (display, wmHints->icon_mask);
            }

            XSetWMHints (display, windowH, wmHints);
            XFree (wmHints);
        }
    }

    //==============================================================================
    void handleWindowMessage (XEvent& event)
    {
        switch (event.xany.type)
        {
            case KeyPressEventType:     handleKeyPressEvent (event.xkey); break;
            case KeyRelease:            handleKeyReleaseEvent (event.xkey); break;
            case ButtonPress:           handleButtonPressEvent (event.xbutton); break;
            case ButtonRelease:         handleButtonReleaseEvent (event.xbutton); break;
            case MotionNotify:          handleMotionNotifyEvent (event.xmotion); break;
            case EnterNotify:           handleEnterNotifyEvent (event.xcrossing); break;
            case LeaveNotify:           handleLeaveNotifyEvent (event.xcrossing); break;
            case FocusIn:               handleFocusInEvent(); break;
            case FocusOut:              handleFocusOutEvent(); break;
            case Expose:                handleExposeEvent (event.xexpose); break;
            case MappingNotify:         handleMappingNotify (event.xmapping); break;
            case ClientMessage:         handleClientMessageEvent (event.xclient, event); break;
            case SelectionNotify:       handleDragAndDropSelection (event); break;
            case ConfigureNotify:       handleConfigureNotifyEvent (event.xconfigure); break;
            case ReparentNotify:
            case GravityNotify:         handleGravityNotify(); break;
            case SelectionClear:        handleExternalSelectionClear(); break;
            case SelectionRequest:      handleExternalSelectionRequest (event); break;

            case CirculateNotify:
            case CreateNotify:
            case DestroyNotify:
                // Think we can ignore these
                break;

            case MapNotify:
                mapped = true;
                handleBroughtToFront();
                break;

            case UnmapNotify:
                mapped = false;
                break;

            default:
               #if JUCE_USE_XSHM
                if (XSHMHelpers::isShmAvailable (display))
                {
                    ScopedXLock xlock (display);
                    if (event.xany.type == shmCompletionEvent)
                        repainter->notifyPaintCompleted();
                }
               #endif
                break;
        }
    }

    void handleKeyPressEvent (XKeyEvent& keyEvent)
    {
        auto oldMods = ModifierKeys::currentModifiers;

        char utf8 [64] = { 0 };
        juce_wchar unicodeChar = 0;
        int keyCode = 0;
        bool keyDownChange = false;
        KeySym sym;

        {
            ScopedXLock xlock (display);
            updateKeyStates ((int) keyEvent.keycode, true);

            String oldLocale (::setlocale (LC_ALL, nullptr));
            ::setlocale (LC_ALL, "");
            XLookupString (&keyEvent, utf8, sizeof (utf8), &sym, nullptr);

            if (oldLocale.isNotEmpty())
                ::setlocale (LC_ALL, oldLocale.toRawUTF8());

            unicodeChar = *CharPointer_UTF8 (utf8);
            keyCode = (int) unicodeChar;

            if (keyCode < 0x20)
                keyCode = (int) XkbKeycodeToKeysym (display, (::KeyCode) keyEvent.keycode, 0, ModifierKeys::currentModifiers.isShiftDown() ? 1 : 0);

            keyDownChange = (sym != NoSymbol) && ! updateKeyModifiersFromSym (sym, true);
        }

        bool keyPressed = false;

        if ((sym & 0xff00) == 0xff00 || keyCode == XK_ISO_Left_Tab)
        {
            switch (sym)  // Translate keypad
            {
                case XK_KP_Add:         keyCode = XK_plus; break;
                case XK_KP_Subtract:    keyCode = XK_hyphen; break;
                case XK_KP_Divide:      keyCode = XK_slash; break;
                case XK_KP_Multiply:    keyCode = XK_asterisk; break;
                case XK_KP_Enter:       keyCode = XK_Return; break;
                case XK_KP_Insert:      keyCode = XK_Insert; break;
                case XK_Delete:
                case XK_KP_Delete:      keyCode = XK_Delete; break;
                case XK_KP_Left:        keyCode = XK_Left; break;
                case XK_KP_Right:       keyCode = XK_Right; break;
                case XK_KP_Up:          keyCode = XK_Up; break;
                case XK_KP_Down:        keyCode = XK_Down; break;
                case XK_KP_Home:        keyCode = XK_Home; break;
                case XK_KP_End:         keyCode = XK_End; break;
                case XK_KP_Page_Down:   keyCode = XK_Page_Down; break;
                case XK_KP_Page_Up:     keyCode = XK_Page_Up; break;

                case XK_KP_0:           keyCode = XK_0; break;
                case XK_KP_1:           keyCode = XK_1; break;
                case XK_KP_2:           keyCode = XK_2; break;
                case XK_KP_3:           keyCode = XK_3; break;
                case XK_KP_4:           keyCode = XK_4; break;
                case XK_KP_5:           keyCode = XK_5; break;
                case XK_KP_6:           keyCode = XK_6; break;
                case XK_KP_7:           keyCode = XK_7; break;
                case XK_KP_8:           keyCode = XK_8; break;
                case XK_KP_9:           keyCode = XK_9; break;

                default:                break;
            }

            switch (keyCode)
            {
                case XK_Left:
                case XK_Right:
                case XK_Up:
                case XK_Down:
                case XK_Page_Up:
                case XK_Page_Down:
                case XK_End:
                case XK_Home:
                case XK_Delete:
                case XK_Insert:
                    keyPressed = true;
                    keyCode = static_cast<int> ((keyCode & 0xff) | Keys::extendedKeyModifier);
                    break;

                case XK_Tab:
                case XK_Return:
                case XK_Escape:
                case XK_BackSpace:
                    keyPressed = true;
                    keyCode &= 0xff;
                    break;

                case XK_ISO_Left_Tab:
                    keyPressed = true;
                    keyCode = XK_Tab & 0xff;
                    break;

                default:
                    if (sym >= XK_F1 && sym <= XK_F35)
                    {
                        keyPressed = true;
                        keyCode = static_cast<int> ((sym & 0xff) | Keys::extendedKeyModifier);
                    }
                    break;
            }
        }

        if (utf8[0] != 0 || ((sym & 0xff00) == 0 && sym >= 8))
            keyPressed = true;

        if (oldMods != ModifierKeys::currentModifiers)
            handleModifierKeysChange();

        if (keyDownChange)
            handleKeyUpOrDown (true);

        if (keyPressed)
            handleKeyPress (keyCode, unicodeChar);
    }

    static bool isKeyReleasePartOfAutoRepeat (const XKeyEvent& keyReleaseEvent)
    {
        if (XPending (display))
        {
            XEvent e;
            XPeekEvent (display, &e);

            // Look for a subsequent key-down event with the same timestamp and keycode
            return e.type == KeyPressEventType
                    && e.xkey.keycode == keyReleaseEvent.keycode
                    && e.xkey.time == keyReleaseEvent.time;
        }

        return false;
    }

    void handleKeyReleaseEvent (const XKeyEvent& keyEvent)
    {
        if (! isKeyReleasePartOfAutoRepeat (keyEvent))
        {
            updateKeyStates ((int) keyEvent.keycode, false);
            KeySym sym;

            {
                ScopedXLock xlock (display);
                sym = XkbKeycodeToKeysym (display, (::KeyCode) keyEvent.keycode, 0, 0);
            }

            auto oldMods = ModifierKeys::currentModifiers;
            const bool keyDownChange = (sym != NoSymbol) && ! updateKeyModifiersFromSym (sym, false);

            if (oldMods != ModifierKeys::currentModifiers)
                handleModifierKeysChange();

            if (keyDownChange)
                handleKeyUpOrDown (false);
        }
    }

    template <typename EventType>
    Point<float> getMousePos (const EventType& e) noexcept
    {
        return Point<float> ((float) e.x, (float) e.y) / currentScaleFactor;
    }

    void handleWheelEvent (const XButtonPressedEvent& buttonPressEvent, float amount)
    {
        MouseWheelDetails wheel;
        wheel.deltaX = 0.0f;
        wheel.deltaY = amount;
        wheel.isReversed = false;
        wheel.isSmooth = false;
        wheel.isInertial = false;

        handleMouseWheel (MouseInputSource::InputSourceType::mouse, getMousePos (buttonPressEvent),
                          getEventTime (buttonPressEvent), wheel);
    }

    void handleButtonPressEvent (const XButtonPressedEvent& buttonPressEvent, int buttonModifierFlag)
    {
        ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withFlags (buttonModifierFlag);
        toFront (true);
        handleMouseEvent (MouseInputSource::InputSourceType::mouse, getMousePos (buttonPressEvent), ModifierKeys::currentModifiers,
                          MouseInputSource::invalidPressure, MouseInputSource::invalidOrientation, getEventTime (buttonPressEvent), {});
    }

    void handleButtonPressEvent (const XButtonPressedEvent& buttonPressEvent)
    {
        updateKeyModifiers ((int) buttonPressEvent.state);

        auto mapIndex = (uint32) (buttonPressEvent.button - Button1);

        if (mapIndex < (uint32) numElementsInArray (pointerMap))
        {
            switch (pointerMap[mapIndex])
            {
                case Keys::WheelUp:         handleWheelEvent (buttonPressEvent,  50.0f / 256.0f); break;
                case Keys::WheelDown:       handleWheelEvent (buttonPressEvent, -50.0f / 256.0f); break;
                case Keys::LeftButton:      handleButtonPressEvent (buttonPressEvent, ModifierKeys::leftButtonModifier); break;
                case Keys::RightButton:     handleButtonPressEvent (buttonPressEvent, ModifierKeys::rightButtonModifier); break;
                case Keys::MiddleButton:    handleButtonPressEvent (buttonPressEvent, ModifierKeys::middleButtonModifier); break;
                default: break;
            }
        }

        clearLastMousePos();
    }

    void handleButtonReleaseEvent (const XButtonReleasedEvent& buttonRelEvent)
    {
        updateKeyModifiers ((int) buttonRelEvent.state);

        if (parentWindow != 0)
            updateWindowBounds();

        auto mapIndex = (uint32) (buttonRelEvent.button - Button1);

        if (mapIndex < (uint32) numElementsInArray (pointerMap))
        {
            switch (pointerMap[mapIndex])
            {
                case Keys::LeftButton:      ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutFlags (ModifierKeys::leftButtonModifier); break;
                case Keys::RightButton:     ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutFlags (ModifierKeys::rightButtonModifier); break;
                case Keys::MiddleButton:    ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withoutFlags (ModifierKeys::middleButtonModifier); break;
                default: break;
            }
        }

        if (dragState->dragging)
            handleExternalDragButtonReleaseEvent();

        handleMouseEvent (MouseInputSource::InputSourceType::mouse, getMousePos (buttonRelEvent), ModifierKeys::currentModifiers,
                          MouseInputSource::invalidPressure, MouseInputSource::invalidOrientation, getEventTime (buttonRelEvent));

        clearLastMousePos();
    }

    void handleMotionNotifyEvent (const XPointerMovedEvent& movedEvent)
    {
        updateKeyModifiers ((int) movedEvent.state);

        lastMousePos = Point<int> (movedEvent.x_root, movedEvent.y_root);

        if (dragState->dragging)
            handleExternalDragMotionNotify();

        handleMouseEvent (MouseInputSource::InputSourceType::mouse, getMousePos (movedEvent), ModifierKeys::currentModifiers,
                          MouseInputSource::invalidPressure, MouseInputSource::invalidOrientation, getEventTime (movedEvent));
    }

    void handleEnterNotifyEvent (const XEnterWindowEvent& enterEvent)
    {
        if (parentWindow != 0)
            updateWindowBounds();

        clearLastMousePos();

        if (! ModifierKeys::currentModifiers.isAnyMouseButtonDown())
        {
            updateKeyModifiers ((int) enterEvent.state);
            handleMouseEvent (MouseInputSource::InputSourceType::mouse, getMousePos (enterEvent), ModifierKeys::currentModifiers,
                              MouseInputSource::invalidPressure, MouseInputSource::invalidOrientation, getEventTime (enterEvent));
        }
    }

    void handleLeaveNotifyEvent (const XLeaveWindowEvent& leaveEvent)
    {
        // Suppress the normal leave if we've got a pointer grab, or if
        // it's a bogus one caused by clicking a mouse button when running
        // in a Window manager
        if (((! ModifierKeys::currentModifiers.isAnyMouseButtonDown()) && leaveEvent.mode == NotifyNormal)
             || leaveEvent.mode == NotifyUngrab)
        {
            updateKeyModifiers ((int) leaveEvent.state);
            handleMouseEvent (MouseInputSource::InputSourceType::mouse, getMousePos (leaveEvent), ModifierKeys::currentModifiers,
                              MouseInputSource::invalidPressure, MouseInputSource::invalidOrientation, getEventTime (leaveEvent));
        }
    }

    void handleFocusInEvent()
    {
        isActiveApplication = true;

        if (isFocused() && ! focused)
        {
            focused = true;
            handleFocusGain();
        }
    }

    void handleFocusOutEvent()
    {
        if (! isFocused() && focused)
        {
            focused = false;
            isActiveApplication = false;

            handleFocusLoss();
        }
    }

    void handleExposeEvent (XExposeEvent& exposeEvent)
    {
        // Batch together all pending expose events
        XEvent nextEvent;
        ScopedXLock xlock (display);

        // if we have opengl contexts then just repaint them all
        // regardless if this is really necessary
        repaintOpenGLContexts();

        if (exposeEvent.window != windowH)
        {
            Window child;
            XTranslateCoordinates (display, exposeEvent.window, windowH,
                                   exposeEvent.x, exposeEvent.y, &exposeEvent.x, &exposeEvent.y,
                                   &child);
        }

        // exposeEvent is in local window local coordinates so do not convert with
        // physicalToScaled, but rather use currentScaleFactor
        repaint (Rectangle<int> (exposeEvent.x, exposeEvent.y,
                                 exposeEvent.width, exposeEvent.height) / currentScaleFactor);

        while (XEventsQueued (display, QueuedAfterFlush) > 0)
        {
            XPeekEvent (display, &nextEvent);

            if (nextEvent.type != Expose || nextEvent.xany.window != exposeEvent.window)
                break;

            XNextEvent (display, &nextEvent);
            auto& nextExposeEvent = (const XExposeEvent&) nextEvent.xexpose;
            repaint (Rectangle<int> (nextExposeEvent.x, nextExposeEvent.y,
                                     nextExposeEvent.width, nextExposeEvent.height) / currentScaleFactor);
        }
    }

    void handleConfigureNotifyEvent (XConfigureEvent& confEvent)
    {
        updateWindowBounds();
        updateBorderSize();
        handleMovedOrResized();

        // if the native title bar is dragged, need to tell any active menus, etc.
        if ((styleFlags & windowHasTitleBar) != 0
              && component.isCurrentlyBlockedByAnotherModalComponent())
        {
            if (auto* currentModalComp = Component::getCurrentlyModalComponent())
                currentModalComp->inputAttemptWhenModal();
        }

        if (confEvent.window == windowH && confEvent.above != 0 && isFrontWindow())
            handleBroughtToFront();
    }

    void handleGravityNotify()
    {
        updateWindowBounds();
        updateBorderSize();
        handleMovedOrResized();
    }

    void handleMappingNotify (XMappingEvent& mappingEvent)
    {
        if (mappingEvent.request != MappingPointer)
        {
            // Deal with modifier/keyboard mapping
            ScopedXLock xlock (display);
            XRefreshKeyboardMapping (&mappingEvent);
            updateModifierMappings();
        }
    }

    void handleClientMessageEvent (XClientMessageEvent& clientMsg, XEvent& event)
    {
        if (clientMsg.message_type == atoms->protocols && clientMsg.format == 32)
        {
            auto atom = (Atom) clientMsg.data.l[0];

            if (atom == atoms->protocolList [Atoms::PING])
            {
                Window root = RootWindow (display, DefaultScreen (display));

                clientMsg.window = root;

                XSendEvent (display, root, False, NoEventMask, &event);
                XFlush (display);
            }
            else if (atom == atoms->protocolList [Atoms::TAKE_FOCUS])
            {
                if ((getStyleFlags() & juce::ComponentPeer::windowIgnoresKeyPresses) == 0)
                {
                    XWindowAttributes atts;

                    ScopedXLock xlock (display);
                    if (clientMsg.window != 0
                         && XGetWindowAttributes (display, clientMsg.window, &atts))
                    {
                        if (atts.map_state == IsViewable)
                            XSetInputFocus (display,
                                            (clientMsg.window == windowH ? getFocusWindow()
                                                                         : clientMsg.window),
                                            RevertToParent,
                                            (::Time) clientMsg.data.l[1]);
                    }
                }
            }
            else if (atom == atoms->protocolList [Atoms::DELETE_WINDOW])
            {
                handleUserClosingWindow();
            }
        }
        else if (clientMsg.message_type == atoms->XdndEnter)
        {
            handleDragAndDropEnter (clientMsg);
        }
        else if (clientMsg.message_type == atoms->XdndLeave)
        {
            handleDragExit (dragInfo);
            resetDragAndDrop();
        }
        else if (clientMsg.message_type == atoms->XdndPosition)
        {
            handleDragAndDropPosition (clientMsg);
        }
        else if (clientMsg.message_type == atoms->XdndDrop)
        {
            handleDragAndDropDrop (clientMsg);
        }
        else if (clientMsg.message_type == atoms->XdndStatus)
        {
            handleExternalDragAndDropStatus (clientMsg);
        }
        else if (clientMsg.message_type == atoms->XdndFinished)
        {
            externalResetDragAndDrop();
        }
        else if (clientMsg.message_type == atoms->XembedMsgType && clientMsg.format == 32)
        {
            handleXEmbedMessage (clientMsg);
        }
    }

    bool externalDragTextInit (const String& text, std::function<void()> cb)
    {
        if (dragState->dragging)
            return false;

        return externalDragInit (true, text, cb);
    }

    bool externalDragFileInit (const StringArray& files, bool /*canMoveFiles*/, std::function<void()> cb)
    {
        if (dragState->dragging)
            return false;

        StringArray uriList;

        for (auto& f : files)
        {
            if (f.matchesWildcard ("?*://*", false))
                uriList.add (f);
            else
                uriList.add ("file://" + f);
        }

        return externalDragInit (false, uriList.joinIntoString ("\r\n"), cb);
    }

    void handleXEmbedMessage (XClientMessageEvent& clientMsg)
    {
        switch (clientMsg.data.l[1])
        {
            case XEMBED_EMBEDDED_NOTIFY:
                parentWindow = (::Window) clientMsg.data.l[3];
                updateWindowBounds();
                component.setBounds (bounds);
                break;
            case XEMBED_FOCUS_IN:
                handleFocusInEvent();
                break;
            case XEMBED_FOCUS_OUT:
                handleFocusOutEvent();
                break;

            default:
                break;
        }
    }

    //==============================================================================
    void showMouseCursor (Cursor cursor) noexcept
    {
        ScopedXLock xlock (display);
        XDefineCursor (display, windowH, cursor);
    }

    //==============================================================================
    double getPlatformScaleFactor() const noexcept override
    {
        return currentScaleFactor;
    }

    //==============================================================================
    void addOpenGLRepaintListener (Component* dummy)
    {
        if (dummy != nullptr)
            glRepaintListeners.addIfNotAlreadyThere (dummy);
    }

    void removeOpenGLRepaintListener (Component* dummy)
    {
        if (dummy != nullptr)
            glRepaintListeners.removeAllInstancesOf (dummy);
    }

    void repaintOpenGLContexts()
    {
        for (int i = 0; i < glRepaintListeners.size(); ++i)
            if (auto* c = glRepaintListeners [i])
                c->handleCommandMessage (0);
    }

    //==============================================================================
    unsigned long createKeyProxy()
    {
        jassert (keyProxy == 0 && windowH != 0);

        if (keyProxy == 0 && windowH != 0)
        {
            XSetWindowAttributes swa;
            swa.event_mask = KeyPressMask | KeyReleaseMask | FocusChangeMask;

            keyProxy = XCreateWindow (display, windowH,
                                      -1, -1, 1, 1, 0, 0,
                                      InputOnly, CopyFromParent,
                                      CWEventMask,
                                      &swa);

            XMapWindow (display, keyProxy);
            XSaveContext (display, (XID) keyProxy, windowHandleXContext, (XPointer) this);
        }

        return keyProxy;
    }

    void deleteKeyProxy()
    {
        jassert (keyProxy != 0);

        if (keyProxy != 0)
        {
            XPointer handlePointer;

            if (! XFindContext (display, (XID) keyProxy, windowHandleXContext, &handlePointer))
                XDeleteContext (display, (XID) keyProxy, windowHandleXContext);

            XDestroyWindow (display, keyProxy);
            XSync (display, false);

            XEvent event;
            while (XCheckWindowEvent (display, keyProxy, getAllEventsMask(), &event) == True)
            {}

            keyProxy = 0;
        }
    }

    //==============================================================================
    bool dontRepaint;
    static bool isActiveApplication;

private:
    //==============================================================================
    class LinuxRepaintManager   : public Timer
    {
    public:
        LinuxRepaintManager (LinuxComponentPeer& p, ::Display* d)
            : peer (p), display (d)
        {
           #if JUCE_USE_XSHM
            useARGBImagesForRendering = XSHMHelpers::isShmAvailable (display);

            if (useARGBImagesForRendering)
            {
                ScopedXLock xlock (display);
                XShmSegmentInfo segmentinfo;

                auto testImage = XShmCreateImage (display, DefaultVisual (display, DefaultScreen (display)),
                                                  24, ZPixmap, nullptr, &segmentinfo, 64, 64);

                useARGBImagesForRendering = (testImage->bits_per_pixel == 32);
                XDestroyImage (testImage);
            }
           #endif
        }

        void timerCallback() override
        {
           #if JUCE_USE_XSHM
            if (shmPaintsPending != 0)
            {
                ScopedXLock xlock (display);

                XEvent evt;
                while (XCheckTypedWindowEvent (display, peer.windowH, peer.shmCompletionEvent, &evt))
                    --shmPaintsPending;
            }

            if (shmPaintsPending != 0)
                return;
           #endif

            if (! regionsNeedingRepaint.isEmpty())
            {
                stopTimer();
                performAnyPendingRepaintsNow();
            }
            else if (Time::getApproximateMillisecondCounter() > lastTimeImageUsed + 3000)
            {
                stopTimer();
                image = Image();
            }
        }

        void repaint (Rectangle<int> area)
        {
            if (! isTimerRunning())
                startTimer (repaintTimerPeriod);

            regionsNeedingRepaint.add (area * peer.currentScaleFactor);
        }

        void performAnyPendingRepaintsNow()
        {
           #if JUCE_USE_XSHM
            if (shmPaintsPending != 0)
            {
                startTimer (repaintTimerPeriod);
                return;
            }
           #endif

            auto originalRepaintRegion = regionsNeedingRepaint;
            regionsNeedingRepaint.clear();
            auto totalArea = originalRepaintRegion.getBounds();

            if (! totalArea.isEmpty())
            {
                if (image.isNull() || image.getWidth() < totalArea.getWidth()
                     || image.getHeight() < totalArea.getHeight())
                {
                   #if JUCE_USE_XSHM
                    image = Image (new XBitmapImage (display, useARGBImagesForRendering ? Image::ARGB
                                                                                        : Image::RGB,
                   #else
                    image = Image (new XBitmapImage (display, Image::RGB,
                   #endif
                                                     (totalArea.getWidth()  + 31) & ~31,
                                                     (totalArea.getHeight() + 31) & ~31,
                                                     false, (unsigned int) peer.depth, peer.visual));
                }

                startTimer (repaintTimerPeriod);

                RectangleList<int> adjustedList (originalRepaintRegion);
                adjustedList.offsetAll (-totalArea.getX(), -totalArea.getY());

                if (peer.depth == 32)
                    for (auto& i : originalRepaintRegion)
                        image.clear (i - totalArea.getPosition());

                {
                    auto context = peer.getComponent().getLookAndFeel()
                                     .createGraphicsContext (image, -totalArea.getPosition(), adjustedList);

                    context->addTransform (AffineTransform::scale ((float) peer.currentScaleFactor));
                    peer.handlePaint (*context);
                }

                for (auto& i : originalRepaintRegion)
                {
                    auto* xbitmap = static_cast<XBitmapImage*> (image.getPixelData());

                   #if JUCE_USE_XSHM
                    if (xbitmap->isUsingXShm())
                        ++shmPaintsPending;
                   #endif


                   xbitmap->blitToWindow (peer.windowH,
                                          i.getX(), i.getY(),
                                          (unsigned int) i.getWidth(),
                                          (unsigned int) i.getHeight(),
                                          i.getX() - totalArea.getX(), i.getY() - totalArea.getY());
                }
            }

            lastTimeImageUsed = Time::getApproximateMillisecondCounter();
            startTimer (repaintTimerPeriod);
        }

       #if JUCE_USE_XSHM
        void notifyPaintCompleted() noexcept        { --shmPaintsPending; }
       #endif

    private:
        enum { repaintTimerPeriod = 1000 / 100 };

        LinuxComponentPeer& peer;
        Image image;
        uint32 lastTimeImageUsed = 0;
        RectangleList<int> regionsNeedingRepaint;
        ::Display* display;

       #if JUCE_USE_XSHM
        bool useARGBImagesForRendering;
        int shmPaintsPending = 0;
       #endif
        JUCE_DECLARE_NON_COPYABLE (LinuxRepaintManager)
    };

    std::unique_ptr<Atoms> atoms;
    std::unique_ptr<LinuxRepaintManager> repainter;

    friend class LinuxRepaintManager;
    Window windowH = {}, parentWindow = {}, keyProxy = {};
    Rectangle<int> bounds;
    Point<int> parentScreenPosition;
    Image taskbarImage;
    bool fullScreen = false, mapped = false, focused = false;
    Visual* visual = {};
    int depth = 0;
    BorderSize<int> windowBorder;
    bool isAlwaysOnTop;
    double currentScaleFactor = 1.0;
    Array<Component*> glRepaintListeners;
    enum { KeyPressEventType = 2 };
    static ::Display* display;

   #if JUCE_USE_XSHM
    int shmCompletionEvent = 0;
   #endif

    struct MotifWmHints
    {
        unsigned long flags;
        unsigned long functions;
        unsigned long decorations;
        long input_mode;
        unsigned long status;
    };

    static void updateKeyStates (int keycode, bool press) noexcept
    {
        const int keybyte = keycode >> 3;
        const int keybit = (1 << (keycode & 7));

        if (press)
            Keys::keyStates[keybyte] = static_cast<char> (Keys::keyStates[keybyte] | keybit);
        else
            Keys::keyStates[keybyte] = static_cast<char> (Keys::keyStates[keybyte] & ~keybit);
    }

    static void updateKeyModifiers (int status) noexcept
    {
        int keyMods = 0;

        if ((status & ShiftMask) != 0)     keyMods |= ModifierKeys::shiftModifier;
        if ((status & ControlMask) != 0)   keyMods |= ModifierKeys::ctrlModifier;
        if ((status & Keys::AltMask) != 0) keyMods |= ModifierKeys::altModifier;

        ModifierKeys::currentModifiers = ModifierKeys::currentModifiers.withOnlyMouseButtons().withFlags (keyMods);

        Keys::numLock  = ((status & Keys::NumLockMask) != 0);
        Keys::capsLock = ((status & LockMask) != 0);
    }

    static bool updateKeyModifiersFromSym (KeySym sym, bool press) noexcept
    {
        int modifier = 0;
        bool isModifier = true;

        switch (sym)
        {
            case XK_Shift_L:
            case XK_Shift_R:        modifier = ModifierKeys::shiftModifier; break;

            case XK_Control_L:
            case XK_Control_R:      modifier = ModifierKeys::ctrlModifier; break;

            case XK_Alt_L:
            case XK_Alt_R:          modifier = ModifierKeys::altModifier; break;

            case XK_Num_Lock:
                if (press)
                    Keys::numLock = ! Keys::numLock;

                break;

            case XK_Caps_Lock:
                if (press)
                    Keys::capsLock = ! Keys::capsLock;

                break;

            case XK_Scroll_Lock:
                break;

            default:
                isModifier = false;
                break;
        }

        ModifierKeys::currentModifiers = press ? ModifierKeys::currentModifiers.withFlags (modifier)
                                               : ModifierKeys::currentModifiers.withoutFlags (modifier);

        return isModifier;
    }

    // Alt and Num lock are not defined by standard X
    // modifier constants: check what they're mapped to
    static void updateModifierMappings() noexcept
    {
        ScopedXLock xlock (display);
        int altLeftCode = XKeysymToKeycode (display, XK_Alt_L);
        int numLockCode = XKeysymToKeycode (display, XK_Num_Lock);

        Keys::AltMask = 0;
        Keys::NumLockMask = 0;

        if (auto* mapping = XGetModifierMapping (display))
        {
            for (int modifierIdx = 0; modifierIdx < 8; ++modifierIdx)
            {
                for (int keyIndex = 0; keyIndex < mapping->max_keypermod; ++keyIndex)
                {
                    auto key = mapping->modifiermap[(modifierIdx * mapping->max_keypermod) + keyIndex];

                    if (key == altLeftCode)
                        Keys::AltMask = 1 << modifierIdx;
                    else if (key == numLockCode)
                        Keys::NumLockMask = 1 << modifierIdx;
                }
            }

            XFreeModifiermap (mapping);
        }
    }

    //==============================================================================
    static void xchangeProperty (Window wndH, Atom property, Atom type, int format, const void* data, int numElements)
    {
        XChangeProperty (display, wndH, property, type, format, PropModeReplace, (const unsigned char*) data, numElements);
    }

    void removeWindowDecorations (Window wndH)
    {
        Atom hints = Atoms::getIfExists (display, "_MOTIF_WM_HINTS");

        if (hints != None)
        {
            MotifWmHints motifHints;
            zerostruct (motifHints);

            motifHints.flags = 2; /* MWM_HINTS_DECORATIONS */
            motifHints.decorations = 0;

            ScopedXLock xlock (display);
            xchangeProperty (wndH, hints, hints, 32, &motifHints, 4);
        }

        hints = Atoms::getIfExists (display, "_WIN_HINTS");

        if (hints != None)
        {
            long gnomeHints = 0;

            ScopedXLock xlock (display);
            xchangeProperty (wndH, hints, hints, 32, &gnomeHints, 1);
        }

        hints = Atoms::getIfExists (display, "KWM_WIN_DECORATION");

        if (hints != None)
        {
            long kwmHints = 2; /*KDE_tinyDecoration*/

            ScopedXLock xlock (display);
            xchangeProperty (wndH, hints, hints, 32, &kwmHints, 1);
        }

        hints = Atoms::getIfExists (display, "_KDE_NET_WM_WINDOW_TYPE_OVERRIDE");

        if (hints != None)
        {
            ScopedXLock xlock (display);
            xchangeProperty (wndH, atoms->windowType, XA_ATOM, 32, &hints, 1);
        }
    }

    void addWindowButtons (Window wndH)
    {
        ScopedXLock xlock (display);
        Atom hints = Atoms::getIfExists (display, "_MOTIF_WM_HINTS");

        if (hints != None)
        {
            MotifWmHints motifHints;
            zerostruct (motifHints);

            motifHints.flags = 1 | 2; /* MWM_HINTS_FUNCTIONS | MWM_HINTS_DECORATIONS */
            motifHints.decorations = 2 /* MWM_DECOR_BORDER */ | 8 /* MWM_DECOR_TITLE */ | 16; /* MWM_DECOR_MENU */

            motifHints.functions = 4 /* MWM_FUNC_MOVE */;

            if ((styleFlags & windowHasCloseButton) != 0)
                motifHints.functions |= 32; /* MWM_FUNC_CLOSE */

            if ((styleFlags & windowHasMinimiseButton) != 0)
            {
                motifHints.functions |= 8; /* MWM_FUNC_MINIMIZE */
                motifHints.decorations |= 0x20; /* MWM_DECOR_MINIMIZE */
            }

            if ((styleFlags & windowHasMaximiseButton) != 0)
            {
                motifHints.functions |= 0x10; /* MWM_FUNC_MAXIMIZE */
                motifHints.decorations |= 0x40; /* MWM_DECOR_MAXIMIZE */
            }

            if ((styleFlags & windowIsResizable) != 0)
            {
                motifHints.functions |= 2; /* MWM_FUNC_RESIZE */
                motifHints.decorations |= 0x4; /* MWM_DECOR_RESIZEH */
            }

            xchangeProperty (wndH, hints, hints, 32, &motifHints, 5);
        }

        hints = Atoms::getIfExists (display, "_NET_WM_ALLOWED_ACTIONS");

        if (hints != None)
        {
            Atom netHints [6];
            int num = 0;

            if ((styleFlags & windowIsResizable) != 0)
                netHints [num++] = Atoms::getIfExists (display, "_NET_WM_ACTION_RESIZE");

            if ((styleFlags & windowHasMaximiseButton) != 0)
                netHints [num++] = Atoms::getIfExists (display, "_NET_WM_ACTION_FULLSCREEN");

            if ((styleFlags & windowHasMinimiseButton) != 0)
                netHints [num++] = Atoms::getIfExists (display, "_NET_WM_ACTION_MINIMIZE");

            if ((styleFlags & windowHasCloseButton) != 0)
                netHints [num++] = Atoms::getIfExists (display, "_NET_WM_ACTION_CLOSE");

            xchangeProperty (wndH, hints, XA_ATOM, 32, &netHints, num);
        }
    }

    void setWindowType()
    {
        Atom netHints [2];

        if ((styleFlags & windowIsTemporary) != 0
             || ((styleFlags & windowHasDropShadow) == 0 && Desktop::canUseSemiTransparentWindows()))
            netHints [0] = Atoms::getIfExists (display, "_NET_WM_WINDOW_TYPE_COMBO");
        else
            netHints [0] = Atoms::getIfExists (display, "_NET_WM_WINDOW_TYPE_NORMAL");

        xchangeProperty (windowH, atoms->windowType, XA_ATOM, 32, &netHints, 1);

        int numHints = 0;

        if ((styleFlags & windowAppearsOnTaskbar) == 0)
            netHints [numHints++] = Atoms::getIfExists (display, "_NET_WM_STATE_SKIP_TASKBAR");

        if (component.isAlwaysOnTop())
            netHints [numHints++] = Atoms::getIfExists (display, "_NET_WM_STATE_ABOVE");

        if (numHints > 0)
            xchangeProperty (windowH, atoms->windowState, XA_ATOM, 32, &netHints, numHints);
    }

    void createWindow (Window parentToAddTo)
    {
        ScopedXLock xlock (display);
        resetDragAndDrop();

        // Get defaults for various properties
        const int screen = DefaultScreen (display);
        Window root = RootWindow (display, screen);

        parentWindow = parentToAddTo;

        // Try to obtain a 32-bit visual or fallback to 24 or 16
        visual = Visuals::findVisualFormat (display, (styleFlags & windowIsSemiTransparent) ? 32 : 24, depth);

        if (visual == nullptr)
        {
            Logger::outputDebugString ("ERROR: System doesn't support 32, 24 or 16 bit RGB display.\n");
            Process::terminate();
        }

        // Create and install a colormap suitable fr our visual
        Colormap colormap = XCreateColormap (display, root, visual, AllocNone);
        XInstallColormap (display, colormap);

        // Set up the window attributes
        XSetWindowAttributes swa;
        swa.border_pixel = 0;
        swa.background_pixmap = None;
        swa.colormap = colormap;
        swa.override_redirect = ((styleFlags & windowIsTemporary) != 0) ? True : False;
        swa.event_mask = getAllEventsMask();

        windowH = XCreateWindow (display, parentToAddTo != 0 ? parentToAddTo : root,
                                 0, 0, 1, 1,
                                 0, depth, InputOutput, visual,
                                 CWBorderPixel | CWColormap | CWBackPixmap | CWEventMask | CWOverrideRedirect,
                                 &swa);

        // Set the window context to identify the window handle object
        if (XSaveContext (display, (XID) windowH, windowHandleXContext, (XPointer) this))
        {
            // Failed
            jassertfalse;
            Logger::outputDebugString ("Failed to create context information for window.\n");
            XDestroyWindow (display, windowH);
            windowH = 0;
            return;
        }

        // Set window manager hints
        XWMHints* wmHints = XAllocWMHints();
        wmHints->flags = InputHint | StateHint;
        wmHints->input = True;      // Locally active input model
        wmHints->initial_state = NormalState;
        XSetWMHints (display, windowH, wmHints);
        XFree (wmHints);

        // Set the window type
        setWindowType();

        // Define decoration
        if ((styleFlags & windowHasTitleBar) == 0)
            removeWindowDecorations (windowH);
        else
            addWindowButtons (windowH);

        setTitle (component.getName());

        // Associate the PID, allowing to be shut down when something goes wrong
        unsigned long pid = (unsigned long) getpid();
        xchangeProperty (windowH, atoms->pid, XA_CARDINAL, 32, &pid, 1);

        // Set window manager protocols
        xchangeProperty (windowH, atoms->protocols, XA_ATOM, 32, atoms->protocolList, 2);

        // Set drag and drop flags
        xchangeProperty (windowH, atoms->XdndTypeList, XA_ATOM, 32, atoms->allowedMimeTypes, numElementsInArray (atoms->allowedMimeTypes));
        xchangeProperty (windowH, atoms->XdndActionList, XA_ATOM, 32, atoms->allowedActions, numElementsInArray (atoms->allowedActions));
        xchangeProperty (windowH, atoms->XdndActionDescription, XA_STRING, 8, "", 0);
        xchangeProperty (windowH, atoms->XdndAware, XA_ATOM, 32, &atoms->DndVersion, 1);

        unsigned long info[2] = { 0, 1 };
        xchangeProperty (windowH, atoms->XembedInfo, atoms->XembedInfo, 32, (unsigned char*) info, 2);

        initialisePointerMap();
        updateModifierMappings();

       #if JUCE_USE_XSHM
        if (XSHMHelpers::isShmAvailable (display))
            shmCompletionEvent = XShmGetEventBase (display) + ShmCompletion;
       #endif
    }

    void destroyWindow()
    {
        ScopedXLock xlock (display);

        XPointer handlePointer;

        if (keyProxy != 0)
            deleteKeyProxy();

        if (! XFindContext (display, (XID) windowH, windowHandleXContext, &handlePointer))
            XDeleteContext (display, (XID) windowH, windowHandleXContext);

        XDestroyWindow (display, windowH);

        // Wait for it to complete and then remove any events for this
        // window from the event queue.
        XSync (display, false);

        XEvent event;
        while (XCheckWindowEvent (display, windowH, getAllEventsMask(), &event) == True)
        {}
    }

    int getAllEventsMask() const noexcept
    {
        return NoEventMask | KeyPressMask | KeyReleaseMask
                 | EnterWindowMask | LeaveWindowMask | PointerMotionMask | KeymapStateMask
                 | ExposureMask | StructureNotifyMask | FocusChangeMask
                 | ((styleFlags & windowIgnoresMouseClicks) != 0 ?  0 : (ButtonPressMask | ButtonReleaseMask));
    }

    template <typename EventType>
    static int64 getEventTime (const EventType& t)
    {
        return getEventTime (t.time);
    }

    static int64 getEventTime (::Time t)
    {
        static int64 eventTimeOffset = 0x12345678;
        auto thisMessageTime = (int64) t;

        if (eventTimeOffset == 0x12345678)
            eventTimeOffset = Time::currentTimeMillis() - thisMessageTime;

        return eventTimeOffset + thisMessageTime;
    }

    long getUserTime() const
    {
        GetXProperty prop (display, windowH, atoms->userTime, 0, 65536, false, XA_CARDINAL);

        if (! prop.success)
            return 0;

        long result;
        memcpy (&result, prop.data, sizeof (long));

        return result;
    }

    void updateBorderSize()
    {
        if ((styleFlags & windowHasTitleBar) == 0)
        {
            windowBorder = BorderSize<int> (0);
        }
        else if (windowBorder.getTopAndBottom() == 0 && windowBorder.getLeftAndRight() == 0)
        {
            ScopedXLock xlock (display);
            Atom hints = Atoms::getIfExists (display, "_NET_FRAME_EXTENTS");

            if (hints != None)
            {
                GetXProperty prop (display, windowH, hints, 0, 4, false, XA_CARDINAL);

                if (prop.success && prop.actualFormat == 32)
                {
                    auto data = prop.data;
                    std::array<unsigned long, 4> sizes;

                    for (auto& size : sizes)
                    {
                        memcpy (&size, data, sizeof (unsigned long));
                        data += sizeof (unsigned long);
                    }

                    windowBorder = BorderSize<int> ((int) sizes[2], (int) sizes[0],
                                                    (int) sizes[3], (int) sizes[1]);
                }
            }
        }
    }

    void updateWindowBounds()
    {
        jassert (windowH != 0);
        if (windowH != 0)
        {
            Window root, child;
            int wx = 0, wy = 0;
            unsigned int ww = 0, wh = 0, bw, bitDepth;

            ScopedXLock xlock (display);

            if (XGetGeometry (display, (::Drawable) windowH, &root, &wx, &wy, &ww, &wh, &bw, &bitDepth))
            {
                int rootX = 0, rootY = 0;

                if (! XTranslateCoordinates (display, windowH, root, 0, 0, &rootX, &rootY, &child))
                    rootX = rootY = 0;

                if (parentWindow == 0)
                {
                    wx = rootX;
                    wy = rootY;
                }
                else
                {
                    parentScreenPosition = Desktop::getInstance().getDisplays().physicalToLogical (Point<int> (rootX, rootY));
                }
            }

            Rectangle<int> physicalBounds (wx, wy, (int) ww, (int) wh);

            updateScaleFactorFromNewBounds (physicalBounds, true);

            bounds = (parentWindow == 0 ? Desktop::getInstance().getDisplays().physicalToLogical (physicalBounds)
                                        : physicalBounds / currentScaleFactor);
        }
    }

    //==============================================================================
    struct DragState
    {
        DragState (::Display* d)
        {
            if (isText)
                allowedTypes.add (Atoms::getCreating (d, "text/plain"));
            else
                allowedTypes.add (Atoms::getCreating (d, "text/uri-list"));
        }

        bool isText = false;
        bool dragging = false;         // currently performing outgoing external dnd as Xdnd source, have grabbed mouse
        bool expectingStatus = false;  // XdndPosition sent, waiting for XdndStatus
        bool canDrop = false;          // target window signals it will accept the drop
        Window targetWindow = None;    // potential drop target
        int xdndVersion = -1;          // negotiated version with target
        Rectangle<int> silentRect;
        String textOrFiles;
        Array<Atom> allowedTypes;
        std::function<void()> completionCallback;
    };

    //==============================================================================
    void resetDragAndDrop()
    {
        dragInfo.clear();
        dragInfo.position = Point<int> (-1, -1);
        dragAndDropCurrentMimeType = 0;
        dragAndDropSourceWindow = 0;
        srcMimeTypeAtomList.clear();
        finishAfterDropDataReceived = false;
    }

    void resetExternalDragState()
    {
        dragState.reset (new DragState (display));
    }

    void sendDragAndDropMessage (XClientMessageEvent& msg)
    {
        msg.type = ClientMessage;
        msg.display = display;
        msg.window = dragAndDropSourceWindow;
        msg.format = 32;
        msg.data.l[0] = (long) windowH;

        ScopedXLock xlock (display);
        XSendEvent (display, dragAndDropSourceWindow, False, 0, (XEvent*) &msg);
    }

    bool sendExternalDragAndDropMessage (XClientMessageEvent& msg, Window targetWindow)
    {
        msg.type      = ClientMessage;
        msg.display   = display;
        msg.window    = targetWindow;
        msg.format    = 32;
        msg.data.l[0] = (long) windowH;

        ScopedXLock xlock (display);
        return XSendEvent (display, targetWindow, False, 0, (XEvent*) &msg) != 0;
    }

    void sendExternalDragAndDropDrop (Window targetWindow)
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndDrop;
        msg.data.l[2] = CurrentTime;

        sendExternalDragAndDropMessage (msg, targetWindow);
    }

    void sendExternalDragAndDropEnter (Window targetWindow)
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndEnter;
        msg.data.l[1] = (dragState->xdndVersion << 24);

        for (int i = 0; i < 3; ++i)
            msg.data.l[i + 2] = (long) dragState->allowedTypes[i];

        sendExternalDragAndDropMessage (msg, targetWindow);
    }

    void sendExternalDragAndDropPosition (Window targetWindow)
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndPosition;

        Point<int> mousePos (Desktop::getInstance().getMousePosition());

        if (dragState->silentRect.contains (mousePos)) // we've been asked to keep silent
            return;

        auto& displays = Desktop::getInstance().getDisplays();

        mousePos = displays.logicalToPhysical (mousePos);
        msg.data.l[1] = 0;
        msg.data.l[2] = (mousePos.x << 16) | mousePos.y;
        msg.data.l[3] = CurrentTime;
        msg.data.l[4] = (long) atoms->XdndActionCopy; // this is all JUCE currently supports

        dragState->expectingStatus = sendExternalDragAndDropMessage (msg, targetWindow);
    }

    void sendDragAndDropStatus (bool acceptDrop, Atom dropAction)
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndStatus;
        msg.data.l[1] = (acceptDrop ? 1 : 0) | 2; // 2 indicates that we want to receive position messages
        msg.data.l[4] = (long) dropAction;

        sendDragAndDropMessage (msg);
    }

    void sendExternalDragAndDropLeave (Window targetWindow)
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndLeave;
        sendExternalDragAndDropMessage (msg, targetWindow);
    }

    void sendDragAndDropFinish()
    {
        XClientMessageEvent msg;
        zerostruct (msg);

        msg.message_type = atoms->XdndFinished;
        sendDragAndDropMessage (msg);
    }

    void handleExternalSelectionClear()
    {
        if (dragState->dragging)
            externalResetDragAndDrop();
    }

    void handleExternalSelectionRequest (const XEvent& evt)
    {
        Atom targetType = evt.xselectionrequest.target;

        XEvent s;
        s.xselection.type = SelectionNotify;
        s.xselection.requestor = evt.xselectionrequest.requestor;
        s.xselection.selection = evt.xselectionrequest.selection;
        s.xselection.target = targetType;
        s.xselection.property = None;
        s.xselection.time = evt.xselectionrequest.time;

        if (dragState->allowedTypes.contains (targetType))
        {
            s.xselection.property = evt.xselectionrequest.property;

            xchangeProperty (evt.xselectionrequest.requestor,
                             evt.xselectionrequest.property,
                             targetType, 8,
                             dragState->textOrFiles.toRawUTF8(),
                             (int) dragState->textOrFiles.getNumBytesAsUTF8());
        }

        XSendEvent (display, evt.xselectionrequest.requestor, True, 0, &s);
    }

    void handleExternalDragAndDropStatus (const XClientMessageEvent& clientMsg)
    {
        if (dragState->expectingStatus)
        {
            dragState->expectingStatus = false;
            dragState->canDrop = false;
            dragState->silentRect = Rectangle<int>();

            if ((clientMsg.data.l[1] & 1) != 0
                 && ((Atom) clientMsg.data.l[4] == atoms->XdndActionCopy
                      || (Atom) clientMsg.data.l[4] == atoms->XdndActionPrivate))
            {
                if ((clientMsg.data.l[1] & 2) == 0) // target requests silent rectangle
                    dragState->silentRect.setBounds ((int) clientMsg.data.l[2] >> 16,
                                                    (int) clientMsg.data.l[2] & 0xffff,
                                                    (int) clientMsg.data.l[3] >> 16,
                                                    (int) clientMsg.data.l[3] & 0xffff);

                dragState->canDrop = true;
            }
        }
    }

    void handleExternalDragButtonReleaseEvent()
    {
        if (dragState->dragging)
            XUngrabPointer (display, CurrentTime);

        if (dragState->canDrop)
        {
            sendExternalDragAndDropDrop (dragState->targetWindow);
        }
        else
        {
            sendExternalDragAndDropLeave (dragState->targetWindow);
            externalResetDragAndDrop();
        }
    }

    void handleExternalDragMotionNotify()
    {
        Window targetWindow = externalFindDragTargetWindow (RootWindow (display, DefaultScreen (display)));

        if (dragState->targetWindow != targetWindow)
        {
            if (dragState->targetWindow != None)
                sendExternalDragAndDropLeave (dragState->targetWindow);

            dragState->canDrop = false;
            dragState->silentRect = Rectangle<int>();

            if (targetWindow == None)
                return;

            dragState->xdndVersion = getDnDVersionForWindow (targetWindow);

            if (dragState->xdndVersion == -1)
                return;

            sendExternalDragAndDropEnter (targetWindow);
            dragState->targetWindow = targetWindow;
        }

        if (! dragState->expectingStatus)
            sendExternalDragAndDropPosition (targetWindow);
    }

    void handleDragAndDropPosition (const XClientMessageEvent& clientMsg)
    {
        if (dragAndDropSourceWindow == 0)
            return;

        dragAndDropSourceWindow = (::Window) clientMsg.data.l[0];

        Point<int> dropPos ((int) clientMsg.data.l[2] >> 16,
                            (int) clientMsg.data.l[2] & 0xffff);

        dropPos = Desktop::getInstance().getDisplays().physicalToLogical (dropPos);
        dropPos -= bounds.getPosition();

        Atom targetAction = atoms->XdndActionCopy;

        for (int i = numElementsInArray (atoms->allowedActions); --i >= 0;)
        {
            if ((Atom) clientMsg.data.l[4] == atoms->allowedActions[i])
            {
                targetAction = atoms->allowedActions[i];
                break;
            }
        }

        sendDragAndDropStatus (true, targetAction);

        if (dragInfo.position != dropPos)
        {
            dragInfo.position = dropPos;

            if (dragInfo.isEmpty())
                updateDraggedFileList (clientMsg);

            if (! dragInfo.isEmpty())
                handleDragMove (dragInfo);
        }
    }

    void handleDragAndDropDrop (const XClientMessageEvent& clientMsg)
    {
        if (dragInfo.isEmpty())
        {
            // no data, transaction finished in handleDragAndDropSelection()
            finishAfterDropDataReceived = true;
            updateDraggedFileList (clientMsg);
        }
        else
        {
            handleDragAndDropDataReceived();  // data was already received
        }
    }

    void handleDragAndDropDataReceived()
    {
        DragInfo dragInfoCopy (dragInfo);

        sendDragAndDropFinish();
        resetDragAndDrop();

        if (! dragInfoCopy.isEmpty())
            handleDragDrop (dragInfoCopy);
    }

    void handleDragAndDropEnter (const XClientMessageEvent& clientMsg)
    {
        dragInfo.clear();
        srcMimeTypeAtomList.clear();

        dragAndDropCurrentMimeType = 0;
        auto dndCurrentVersion = static_cast<unsigned long> (clientMsg.data.l[1] & 0xff000000) >> 24;

        if (dndCurrentVersion < 3 || dndCurrentVersion > Atoms::DndVersion)
        {
            dragAndDropSourceWindow = 0;
            return;
        }

        dragAndDropSourceWindow = (::Window) clientMsg.data.l[0];

        if ((clientMsg.data.l[1] & 1) != 0)
        {
            ScopedXLock xlock (display);
            GetXProperty prop (display, dragAndDropSourceWindow, atoms->XdndTypeList, 0, 0x8000000L, false, XA_ATOM);

            if (prop.success
                 && prop.actualType == XA_ATOM
                 && prop.actualFormat == 32
                 && prop.numItems != 0)
            {
                auto* types = prop.data;

                for (unsigned long i = 0; i < prop.numItems; ++i)
                {
                    unsigned long type;
                    memcpy (&type, types, sizeof (unsigned long));

                    if (type != None)
                        srcMimeTypeAtomList.add (type);

                    types += sizeof (unsigned long);
                }
            }
        }

        if (srcMimeTypeAtomList.isEmpty())
        {
            for (int i = 2; i < 5; ++i)
                if (clientMsg.data.l[i] != None)
                    srcMimeTypeAtomList.add ((unsigned long) clientMsg.data.l[i]);

            if (srcMimeTypeAtomList.isEmpty())
            {
                dragAndDropSourceWindow = 0;
                return;
            }
        }

        for (int i = 0; i < srcMimeTypeAtomList.size() && dragAndDropCurrentMimeType == 0; ++i)
            for (int j = 0; j < numElementsInArray (atoms->allowedMimeTypes); ++j)
                if (srcMimeTypeAtomList[i] == atoms->allowedMimeTypes[j])
                    dragAndDropCurrentMimeType = atoms->allowedMimeTypes[j];

        handleDragAndDropPosition (clientMsg);
    }

    void handleDragAndDropSelection (const XEvent& evt)
    {
        dragInfo.clear();

        if (evt.xselection.property != None)
        {
            StringArray lines;

            {
                MemoryBlock dropData;

                for (;;)
                {
                    GetXProperty prop (display, evt.xany.window, evt.xselection.property,
                                       (long) (dropData.getSize() / 4), 65536, false, AnyPropertyType);

                    if (! prop.success)
                        break;

                    dropData.append (prop.data, (size_t) (prop.actualFormat / 8) * prop.numItems);

                    if (prop.bytesLeft <= 0)
                        break;
                }

                lines.addLines (dropData.toString());
            }

            if (Atoms::isMimeTypeFile (display, dragAndDropCurrentMimeType))
            {
                for (int i = 0; i < lines.size(); ++i)
                    dragInfo.files.add (URL::removeEscapeChars (lines[i].replace ("file://", String(), true)));

                dragInfo.files.trim();
                dragInfo.files.removeEmptyStrings();
            }
            else
            {
                dragInfo.text = lines.joinIntoString ("\n");
            }

            if (finishAfterDropDataReceived)
                handleDragAndDropDataReceived();
        }
    }

    void updateDraggedFileList (const XClientMessageEvent& clientMsg)
    {
        jassert (dragInfo.isEmpty());

        if (dragAndDropSourceWindow != None
             && dragAndDropCurrentMimeType != None)
        {
            ScopedXLock xlock (display);
            XConvertSelection (display,
                               atoms->XdndSelection,
                               dragAndDropCurrentMimeType,
                               Atoms::getCreating (display, "JXSelectionWindowProperty"),
                               windowH,
                               (::Time) clientMsg.data.l[2]);
        }
    }

    bool isWindowDnDAware (Window w) const
    {
        int numProperties = 0;
        auto* properties = XListProperties (display, w, &numProperties);
        bool dndAwarePropFound = false;

        for (int i = 0; i < numProperties; ++i)
            if (properties[i] == atoms->XdndAware)
                dndAwarePropFound = true;

        if (properties != nullptr)
            XFree (properties);

        return dndAwarePropFound;
    }

    int getDnDVersionForWindow (Window targetWindow)
    {
        GetXProperty prop (display, targetWindow, atoms->XdndAware,
                           0, 2, false, AnyPropertyType);

        if (prop.success && prop.data != None && prop.actualFormat == 32 && prop.numItems == 1)
            return jmin ((int) prop.data[0], (int) atoms->DndVersion);

        return -1;
    }

    Window externalFindDragTargetWindow (Window targetWindow)
    {
        if (targetWindow == None)
            return None;

        if (isWindowDnDAware (targetWindow))
            return targetWindow;

        Window child, phonyWin;
        int phony;
        unsigned int uphony;

        XQueryPointer (display, targetWindow, &phonyWin, &child,
                       &phony, &phony, &phony, &phony, &uphony);

        return externalFindDragTargetWindow (child);
    }

    bool externalDragInit (bool isText, const String& textOrFiles, std::function<void()> cb)
    {
        ScopedXLock xlock (display);

        resetExternalDragState();
        dragState->isText = isText;
        dragState->textOrFiles = textOrFiles;
        dragState->targetWindow = windowH;
        dragState->completionCallback = cb;

        const int pointerGrabMask = Button1MotionMask | ButtonReleaseMask;

        if (XGrabPointer (display, windowH, True, pointerGrabMask,
                          GrabModeAsync, GrabModeAsync, None, None, CurrentTime) == GrabSuccess)
        {
            // No other method of changing the pointer seems to work, this call is needed from this very context
            XChangeActivePointerGrab (display, pointerGrabMask, (Cursor) createDraggingHandCursor(), CurrentTime);

            XSetSelectionOwner (display, atoms->XdndSelection, windowH, CurrentTime);

            // save the available types to XdndTypeList
            xchangeProperty (windowH, atoms->XdndTypeList, XA_ATOM, 32,
                             dragState->allowedTypes.getRawDataPointer(),
                             dragState->allowedTypes.size());

            dragState->dragging = true;
            dragState->xdndVersion = getDnDVersionForWindow (dragState->targetWindow);

            sendExternalDragAndDropEnter (dragState->targetWindow);
            handleExternalDragMotionNotify();

            return true;
        }

        return false;
    }

    void externalResetDragAndDrop()
    {
        if (dragState->dragging)
        {
            ScopedXLock xlock (display);
            XUngrabPointer (display, CurrentTime);
        }

        if (dragState->completionCallback != nullptr)
            dragState->completionCallback();

        resetExternalDragState();
    }

    std::unique_ptr<DragState> dragState;
    DragInfo dragInfo;
    Atom dragAndDropCurrentMimeType;
    Window dragAndDropSourceWindow;
    bool finishAfterDropDataReceived;

    Array<Atom> srcMimeTypeAtomList;

    int pointerMap[5] = {};

    void initialisePointerMap()
    {
        const int numButtons = XGetPointerMapping (display, nullptr, 0);
        pointerMap[2] = pointerMap[3] = pointerMap[4] = Keys::NoButton;

        if (numButtons == 2)
        {
            pointerMap[0] = Keys::LeftButton;
            pointerMap[1] = Keys::RightButton;
        }
        else if (numButtons >= 3)
        {
            pointerMap[0] = Keys::LeftButton;
            pointerMap[1] = Keys::MiddleButton;
            pointerMap[2] = Keys::RightButton;

            if (numButtons >= 5)
            {
                pointerMap[3] = Keys::WheelUp;
                pointerMap[4] = Keys::WheelDown;
            }
        }
    }

    static Point<int> lastMousePos;

    static void clearLastMousePos() noexcept
    {
        lastMousePos = Point<int> (0x100000, 0x100000);
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LinuxComponentPeer)
};

bool LinuxComponentPeer::isActiveApplication = false;
Point<int> LinuxComponentPeer::lastMousePos;
::Display* LinuxComponentPeer::display = nullptr;

//==============================================================================
namespace WindowingHelpers
{
    static void windowMessageReceive (XEvent& event)
    {
        if (event.xany.window != None)
        {
           #if JUCE_X11_SUPPORTS_XEMBED
            if (! juce_handleXEmbedEvent (nullptr, &event))
           #endif
            {
                if (auto* peer = LinuxComponentPeer::getPeerFor (event.xany.window))
                    peer->handleWindowMessage (event);
            }
        }
        else if (event.xany.type == KeymapNotify)
        {
            auto& keymapEvent = (const XKeymapEvent&) event.xkeymap;
            memcpy (Keys::keyStates, keymapEvent.key_vector, 32);
        }
    }
}

struct WindowingCallbackInitialiser
{
    WindowingCallbackInitialiser()
    {
        dispatchWindowMessage = WindowingHelpers::windowMessageReceive;
    }
};

static WindowingCallbackInitialiser windowingInitialiser;

//==============================================================================
JUCE_API bool JUCE_CALLTYPE Process::isForegroundProcess()
{
    return LinuxComponentPeer::isActiveApplication;
}

// N/A on Linux as far as I know.
JUCE_API void JUCE_CALLTYPE Process::makeForegroundProcess() {}
JUCE_API void JUCE_CALLTYPE Process::hide() {}

//==============================================================================
void Desktop::setKioskComponent (Component* comp, bool enableOrDisable, bool /* allowMenusAndBars */)
{
    if (enableOrDisable)
        comp->setBounds (getDisplays().findDisplayForRect (comp->getScreenBounds()).totalArea);
}

void Desktop::allowedOrientationsChanged() {}

//==============================================================================
ComponentPeer* Component::createNewPeer (int styleFlags, void* nativeWindowToAttachTo)
{
    return new LinuxComponentPeer (*this, styleFlags, (Window) nativeWindowToAttachTo);
}

//==============================================================================
void Displays::findDisplays (float masterScale)
{
    ScopedXDisplay xDisplay;

    if (auto display = xDisplay.display)
    {
        Atom hints = Atoms::getIfExists (display, "_NET_WORKAREA");

        auto getWorkAreaPropertyData = [&] (int screenNum) -> unsigned char*
        {
            if (hints != None)
            {
                GetXProperty prop (display, RootWindow (display, screenNum), hints, 0, 4, false, XA_CARDINAL);

                if (prop.success && prop.actualType == XA_CARDINAL && prop.actualFormat == 32 && prop.numItems == 4)
                    return prop.data;
            }

            return nullptr;
        };

       #if JUCE_USE_XRANDR
        {
            int major_opcode, first_event, first_error;

            if (XQueryExtension (display, "RANDR", &major_opcode, &first_event, &first_error))
            {
                auto& xrandr = XRandrWrapper::getInstance();

                auto numMonitors = ScreenCount (display);
                auto mainDisplay = xrandr.getOutputPrimary (display, RootWindow (display, 0));

                for (int i = 0; i < numMonitors; ++i)
                {
                    if (getWorkAreaPropertyData (i) == nullptr)
                        continue;

                    if (auto* screens = xrandr.getScreenResources (display, RootWindow (display, i)))
                    {
                        for (int j = 0; j < screens->noutput; ++j)
                        {
                            if (screens->outputs[j])
                            {
                                // Xrandr on the raspberry pi fails to determine the main display (mainDisplay == 0)!
                                // Detect this edge case and make the first found display the main display
                                if (! mainDisplay)
                                    mainDisplay = screens->outputs[j];

                                if (auto* output = xrandr.getOutputInfo (display, screens, screens->outputs[j]))
                                {
                                    if (output->crtc)
                                    {
                                        if (auto* crtc = xrandr.getCrtcInfo (display, screens, output->crtc))
                                        {
                                            Display d;
                                            d.totalArea = Rectangle<int> (crtc->x, crtc->y,
                                                                          (int) crtc->width, (int) crtc->height);
                                            d.isMain = (mainDisplay == screens->outputs[j]) && (i == 0);
                                            d.dpi = getDisplayDPI (display, 0);

                                            // The raspberry pi returns a zero sized display, so we need to guard for divide-by-zero
                                            if (output->mm_width > 0 && output->mm_height > 0)
                                                d.dpi = ((static_cast<double> (crtc->width)  * 25.4 * 0.5) / static_cast<double> (output->mm_width))
                                                      + ((static_cast<double> (crtc->height) * 25.4 * 0.5) / static_cast<double> (output->mm_height));

                                            double scale = getScaleForDisplay (output->name, d.dpi);
                                            scale = (scale <= 0.1 ? 1.0 : scale);

                                            d.scale = masterScale * scale;

                                            if (d.isMain)
                                                displays.insert (0, d);
                                            else
                                                displays.add (d);

                                            xrandr.freeCrtcInfo (crtc);
                                        }
                                    }

                                    xrandr.freeOutputInfo (output);
                                }
                            }
                        }

                        xrandr.freeScreenResources (screens);
                    }
                }

                if (! displays.isEmpty() && ! displays.getReference (0).isMain)
                    displays.getReference (0).isMain = true;
            }
        }

        if (displays.isEmpty())
       #endif
       #if JUCE_USE_XINERAMA
        {
            auto screens = XineramaQueryDisplays (display);
            int numMonitors = screens.size();

            for (int index = 0; index < numMonitors; ++index)
            {
                for (int j = numMonitors; --j >= 0;)
                {
                    if (screens[j].screen_number == index)
                    {
                        Display d;
                        d.totalArea = Rectangle<int> (screens[j].x_org,
                                                      screens[j].y_org,
                                                      screens[j].width,
                                                      screens[j].height);
                        d.isMain = (index == 0);
                        d.scale = masterScale;
                        d.dpi = getDisplayDPI (display, 0); // (all screens share the same DPI)

                        displays.add (d);
                    }
                }
            }
        }

        if (displays.isEmpty())
       #endif
        {
            if (hints != None)
            {
                auto numMonitors = ScreenCount (display);

                for (int i = 0; i < numMonitors; ++i)
                {
                    if (auto* positionData = getWorkAreaPropertyData (i))
                    {
                        std::array<long, 4> position;

                        for (auto& p : position)
                        {
                            memcpy (&p, positionData, sizeof (long));
                            positionData += sizeof (long);
                        }

                        Display d;
                        d.totalArea = Rectangle<int> ((int) position[0], (int) position[1],
                                                      (int) position[2], (int) position[3]);
                        d.isMain = displays.isEmpty();
                        d.scale = masterScale;
                        d.dpi = getDisplayDPI (display, i);

                        displays.add (d);
                    }
                }
            }

            if (displays.isEmpty())
            {
                Display d;
                d.totalArea = Rectangle<int> (DisplayWidth  (display, DefaultScreen (display)),
                                              DisplayHeight (display, DefaultScreen (display)));
                d.isMain = true;
                d.scale = masterScale;
                d.dpi = getDisplayDPI (display, 0);

                displays.add (d);
            }
        }

        for (auto& d : displays)
            d.userArea = d.totalArea; // JUCE currently does not support requesting the user area on Linux

        updateToLogical();
    }
}

//==============================================================================
bool MouseInputSource::SourceList::addSource()
{
    if (sources.isEmpty())
    {
        addSource (0, MouseInputSource::InputSourceType::mouse);
        return true;
    }

    return false;
}

bool MouseInputSource::SourceList::canUseTouch()
{
    return false;
}

bool Desktop::canUseSemiTransparentWindows() noexcept
{
   #if JUCE_USE_XRENDER
    auto display = XWindowSystem::getInstance()->displayRef();

    if (XRender::hasCompositingWindowManager (display))
    {
        int matchedDepth = 0, desiredDepth = 32;

        return Visuals::findVisualFormat (display, desiredDepth, matchedDepth) != 0
                && matchedDepth == desiredDepth;
    }
   #endif

    return false;
}

Point<float> MouseInputSource::getCurrentRawMousePosition()
{
    ScopedXDisplay xDisplay;
    auto display = xDisplay.display;

    if (display == nullptr)
        return {};

    Window root, child;
    int x, y, winx, winy;
    unsigned int mask;

    ScopedXLock xlock (display);

    if (XQueryPointer (display,
                       RootWindow (display, DefaultScreen (display)),
                       &root, &child,
                       &x, &y, &winx, &winy, &mask) == False)
    {
        // Pointer not on the default screen
        x = y = -1;
    }

    return Desktop::getInstance().getDisplays().physicalToLogical (Point<float> ((float) x, (float) y));
}

void MouseInputSource::setRawMousePosition (Point<float> newPosition)
{
    ScopedXDisplay xDisplay;

    if (auto display = xDisplay.display)
    {
        ScopedXLock xlock (display);
        Window root = RootWindow (display, DefaultScreen (display));
        newPosition = Desktop::getInstance().getDisplays().logicalToPhysical (newPosition);
        XWarpPointer (display, None, root, 0, 0, 0, 0, roundToInt (newPosition.getX()), roundToInt (newPosition.getY()));
    }
}

double Desktop::getDefaultMasterScale()
{
    return 1.0;
}

Desktop::DisplayOrientation Desktop::getCurrentOrientation() const
{
    return upright;
}

//==============================================================================
static bool screenSaverAllowed = true;

void Desktop::setScreenSaverEnabled (bool isEnabled)
{
    if (screenSaverAllowed != isEnabled)
    {
        screenSaverAllowed = isEnabled;

        ScopedXDisplay xDisplay;

        if (auto display = xDisplay.display)
        {
            typedef void (*tXScreenSaverSuspend) (Display*, Bool);
            static tXScreenSaverSuspend xScreenSaverSuspend = nullptr;

            if (xScreenSaverSuspend == nullptr)
                if (void* h = dlopen ("libXss.so.1", RTLD_GLOBAL | RTLD_NOW))
                    xScreenSaverSuspend = (tXScreenSaverSuspend) dlsym (h, "XScreenSaverSuspend");

            ScopedXLock xlock (display);
            if (xScreenSaverSuspend != nullptr)
                xScreenSaverSuspend (display, ! isEnabled);
        }
    }
}

bool Desktop::isScreenSaverEnabled()
{
    return screenSaverAllowed;
}

//==============================================================================
Image juce_createIconForFile (const File& /* file */)
{
    return {};
}

//==============================================================================
void LookAndFeel::playAlertSound()
{
    std::cout << "\a" << std::flush;
}

//==============================================================================
Rectangle<int> juce_LinuxScaledToPhysicalBounds (ComponentPeer* peer, Rectangle<int> bounds)
{
    if (auto* linuxPeer = dynamic_cast<LinuxComponentPeer*> (peer))
        bounds *= linuxPeer->getPlatformScaleFactor();

    return bounds;
}

void juce_LinuxAddRepaintListener (ComponentPeer* peer, Component* dummy)
{
    if (auto* linuxPeer = dynamic_cast<LinuxComponentPeer*> (peer))
        linuxPeer->addOpenGLRepaintListener (dummy);
}

void juce_LinuxRemoveRepaintListener (ComponentPeer* peer, Component* dummy)
{
    if (auto* linuxPeer = dynamic_cast<LinuxComponentPeer*> (peer))
        linuxPeer->removeOpenGLRepaintListener (dummy);
}

unsigned long juce_createKeyProxyWindow (ComponentPeer* peer)
{
    if (auto* linuxPeer = dynamic_cast<LinuxComponentPeer*> (peer))
        return linuxPeer->createKeyProxy();

    return 0;
}

void juce_deleteKeyProxyWindow (ComponentPeer* peer)
{
    if (auto* linuxPeer = dynamic_cast<LinuxComponentPeer*> (peer))
        linuxPeer->deleteKeyProxy();
}

//==============================================================================
#if JUCE_MODAL_LOOPS_PERMITTED
void JUCE_CALLTYPE NativeMessageBox::showMessageBox (AlertWindow::AlertIconType iconType,
                                                     const String& title, const String& message,
                                                     Component* /* associatedComponent */)
{
    AlertWindow::showMessageBox (iconType, title, message);
}
#endif

void JUCE_CALLTYPE NativeMessageBox::showMessageBoxAsync (AlertWindow::AlertIconType iconType,
                                                          const String& title, const String& message,
                                                          Component* associatedComponent,
                                                          ModalComponentManager::Callback* callback)
{
    AlertWindow::showMessageBoxAsync (iconType, title, message, String(), associatedComponent, callback);
}

bool JUCE_CALLTYPE NativeMessageBox::showOkCancelBox (AlertWindow::AlertIconType iconType,
                                                      const String& title, const String& message,
                                                      Component* associatedComponent,
                                                      ModalComponentManager::Callback* callback)
{
    return AlertWindow::showOkCancelBox (iconType, title, message, String(), String(),
                                         associatedComponent, callback);
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoCancelBox (AlertWindow::AlertIconType iconType,
                                                        const String& title, const String& message,
                                                        Component* associatedComponent,
                                                        ModalComponentManager::Callback* callback)
{
    return AlertWindow::showYesNoCancelBox (iconType, title, message,
                                            String(), String(), String(),
                                            associatedComponent, callback);
}

int JUCE_CALLTYPE NativeMessageBox::showYesNoBox (AlertWindow::AlertIconType iconType,
                                                  const String& title, const String& message,
                                                  Component* associatedComponent,
                                                  ModalComponentManager::Callback* callback)
{
    return AlertWindow::showOkCancelBox (iconType, title, message, TRANS ("Yes"), TRANS ("No"),
                                         associatedComponent, callback);
}

//============================== X11 - MouseCursor =============================
std::map<Cursor, Display*> cursorMap;

void* CustomMouseCursorInfo::create() const
{
    ScopedXDisplay xDisplay;
    auto display = xDisplay.display;

    if (display == nullptr)
        return nullptr;

    ScopedXLock xlock (display);
    auto imageW = (unsigned int) image.getWidth();
    auto imageH = (unsigned int) image.getHeight();
    int hotspotX = hotspot.x;
    int hotspotY = hotspot.y;

  #if JUCE_USE_XCURSOR
    {
        using tXcursorSupportsARGB    = XcursorBool (*) (Display*);
        using tXcursorImageCreate     = XcursorImage* (*) (int, int);
        using tXcursorImageDestroy    = void (*) (XcursorImage*);
        using tXcursorImageLoadCursor = Cursor (*) (Display*, const XcursorImage*);

        static tXcursorSupportsARGB    xcursorSupportsARGB    = nullptr;
        static tXcursorImageCreate     xcursorImageCreate     = nullptr;
        static tXcursorImageDestroy    xcursorImageDestroy    = nullptr;
        static tXcursorImageLoadCursor xcursorImageLoadCursor = nullptr;
        static bool hasBeenLoaded = false;

        if (! hasBeenLoaded)
        {
            hasBeenLoaded = true;

            if (void* h = dlopen ("libXcursor.so.1", RTLD_GLOBAL | RTLD_NOW))
            {
                xcursorSupportsARGB    = (tXcursorSupportsARGB)    dlsym (h, "XcursorSupportsARGB");
                xcursorImageCreate     = (tXcursorImageCreate)     dlsym (h, "XcursorImageCreate");
                xcursorImageLoadCursor = (tXcursorImageLoadCursor) dlsym (h, "XcursorImageLoadCursor");
                xcursorImageDestroy    = (tXcursorImageDestroy)    dlsym (h, "XcursorImageDestroy");

                if (xcursorSupportsARGB == nullptr || xcursorImageCreate == nullptr
                      || xcursorImageLoadCursor == nullptr || xcursorImageDestroy == nullptr
                      || ! xcursorSupportsARGB (display))
                    xcursorSupportsARGB = nullptr;
            }
        }

        if (xcursorSupportsARGB != nullptr)
        {
            if (XcursorImage* xcImage = xcursorImageCreate ((int) imageW, (int) imageH))
            {
                xcImage->xhot = (XcursorDim) hotspotX;
                xcImage->yhot = (XcursorDim) hotspotY;
                XcursorPixel* dest = xcImage->pixels;

                for (int y = 0; y < (int) imageH; ++y)
                    for (int x = 0; x < (int) imageW; ++x)
                        *dest++ = image.getPixelAt (x, y).getARGB();

                void* result = (void*) xcursorImageLoadCursor (display, xcImage);
                xcursorImageDestroy (xcImage);

                if (result != nullptr)
                {
                    cursorMap[(Cursor) result] = display;
                    return result;
                }
            }
        }
    }
  #endif

    Window root = RootWindow (display, DefaultScreen (display));
    unsigned int cursorW, cursorH;
    if (! XQueryBestCursor (display, root, imageW, imageH, &cursorW, &cursorH))
        return nullptr;

    Image im (Image::ARGB, (int) cursorW, (int) cursorH, true);

    {
        Graphics g (im);

        if (imageW > cursorW || imageH > cursorH)
        {
            hotspotX = (hotspotX * (int) cursorW) / (int) imageW;
            hotspotY = (hotspotY * (int) cursorH) / (int) imageH;

            g.drawImage (image, Rectangle<float> ((float) imageW, (float) imageH),
                         RectanglePlacement::xLeft | RectanglePlacement::yTop | RectanglePlacement::onlyReduceInSize);
        }
        else
        {
            g.drawImageAt (image, 0, 0);
        }
    }

    const unsigned int stride = (cursorW + 7) >> 3;
    HeapBlock<char> maskPlane, sourcePlane;
    maskPlane.calloc (stride * cursorH);
    sourcePlane.calloc (stride * cursorH);

    const bool msbfirst = (BitmapBitOrder (display) == MSBFirst);

    for (int y = (int) cursorH; --y >= 0;)
    {
        for (int x = (int) cursorW; --x >= 0;)
        {
            auto mask = (char) (1 << (msbfirst ? (7 - (x & 7)) : (x & 7)));
            auto offset = (unsigned int) y * stride + ((unsigned int) x >> 3);

            auto c = im.getPixelAt (x, y);

            if (c.getAlpha() >= 128)        maskPlane[offset]   |= mask;
            if (c.getBrightness() >= 0.5f)  sourcePlane[offset] |= mask;
        }
    }

    Pixmap sourcePixmap = XCreatePixmapFromBitmapData (display, root, sourcePlane.getData(), cursorW, cursorH, 0xffff, 0, 1);
    Pixmap maskPixmap   = XCreatePixmapFromBitmapData (display, root, maskPlane.getData(),   cursorW, cursorH, 0xffff, 0, 1);

    XColor white, black;
    black.red = black.green = black.blue = 0;
    white.red = white.green = white.blue = 0xffff;

    void* result = (void*) XCreatePixmapCursor (display, sourcePixmap, maskPixmap, &white, &black,
                                                (unsigned int) hotspotX, (unsigned int) hotspotY);

    XFreePixmap (display, sourcePixmap);
    XFreePixmap (display, maskPixmap);

    cursorMap[(Cursor) result] = display;
    return result;
}

void MouseCursor::deleteMouseCursor (void* cursorHandle, bool)
{
    if (cursorHandle != nullptr)
    {
        ScopedXDisplay xDisplay;

        if (auto display = xDisplay.display)
        {
            ScopedXLock xlock (display);

            cursorMap.erase ((Cursor) cursorHandle);
            XFreeCursor (display, (Cursor) cursorHandle);
        }
    }
}

void* MouseCursor::createStandardMouseCursor (MouseCursor::StandardCursorType type)
{
    ScopedXDisplay xDisplay;
    auto display = xDisplay.display;

    if (display == nullptr)
        return None;

    unsigned int shape;

    switch (type)
    {
        case NormalCursor:
        case ParentCursor:                  return None; // Use parent cursor
        case NoCursor:                      return CustomMouseCursorInfo (Image (Image::ARGB, 16, 16, true), {}).create();

        case WaitCursor:                    shape = XC_watch; break;
        case IBeamCursor:                   shape = XC_xterm; break;
        case PointingHandCursor:            shape = XC_hand2; break;
        case LeftRightResizeCursor:         shape = XC_sb_h_double_arrow; break;
        case UpDownResizeCursor:            shape = XC_sb_v_double_arrow; break;
        case UpDownLeftRightResizeCursor:   shape = XC_fleur; break;
        case TopEdgeResizeCursor:           shape = XC_top_side; break;
        case BottomEdgeResizeCursor:        shape = XC_bottom_side; break;
        case LeftEdgeResizeCursor:          shape = XC_left_side; break;
        case RightEdgeResizeCursor:         shape = XC_right_side; break;
        case TopLeftCornerResizeCursor:     shape = XC_top_left_corner; break;
        case TopRightCornerResizeCursor:    shape = XC_top_right_corner; break;
        case BottomLeftCornerResizeCursor:  shape = XC_bottom_left_corner; break;
        case BottomRightCornerResizeCursor: shape = XC_bottom_right_corner; break;
        case CrosshairCursor:               shape = XC_crosshair; break;
        case DraggingHandCursor:            return createDraggingHandCursor();

        case CopyingCursor:
        {
            static unsigned char copyCursorData[] = { 71,73,70,56,57,97,21,0,21,0,145,0,0,0,0,0,255,255,255,0,
              128,128,255,255,255,33,249,4,1,0,0,3,0,44,0,0,0,0,21,0, 21,0,0,2,72,4,134,169,171,16,199,98,11,79,90,71,161,93,56,111,
              78,133,218,215,137,31,82,154,100,200,86,91,202,142,12,108,212,87,235,174, 15,54,214,126,237,226,37,96,59,141,16,37,18,201,142,157,230,204,51,112,
              252,114,147,74,83,5,50,68,147,208,217,16,71,149,252,124,5,0,59,0,0 };
            const int copyCursorSize = 119;

            return CustomMouseCursorInfo (ImageFileFormat::loadFrom (copyCursorData, copyCursorSize), { 1, 3 }).create();
        }

        case NumStandardCursorTypes:
        default:
            jassertfalse;
            return None;
    }

    ScopedXLock xlock (display);

    auto* result = (void*) XCreateFontCursor (display, shape);
    cursorMap[(Cursor) result] = display;

    return result;
}

void MouseCursor::showInWindow (ComponentPeer* peer) const
{
    if (auto* lp = dynamic_cast<LinuxComponentPeer*> (peer))
    {
        ScopedXDisplay xDisplay;

        auto cursor = (Cursor) getHandle();
        auto cursorDisplay = cursorMap[cursor];

        if (cursorHandle != nullptr && xDisplay.display != cursorDisplay)
        {
            cursorMap.erase (cursor);
            XFreeCursor (cursorDisplay, cursor);

            if (auto* customInfo = cursorHandle->getCustomInfo())
                cursorHandle->setHandle (customInfo->create());
            else
                cursorHandle->setHandle (createStandardMouseCursor (cursorHandle->getType()));
        }

        lp->showMouseCursor ((Cursor) getHandle());
    }
}

//=================================== X11 - DND ================================
static LinuxComponentPeer* getPeerForDragEvent (Component* sourceComp)
{
    if (sourceComp == nullptr)
        if (auto* draggingSource = Desktop::getInstance().getDraggingMouseSource(0))
            sourceComp = draggingSource->getComponentUnderMouse();

    if (sourceComp != nullptr)
        if (auto* lp = dynamic_cast<LinuxComponentPeer*> (sourceComp->getPeer()))
            return lp;

    jassertfalse;  // This method must be called in response to a component's mouseDown or mouseDrag event!
    return nullptr;
}

bool DragAndDropContainer::performExternalDragDropOfFiles (const StringArray& files, bool canMoveFiles,
                                                           Component* sourceComp, std::function<void()> callback)
{
    if (files.isEmpty())
        return false;

    if (auto* lp = getPeerForDragEvent (sourceComp))
        return lp->externalDragFileInit (files, canMoveFiles, callback);

    // This method must be called in response to a component's mouseDown or mouseDrag event!
    jassertfalse;
    return false;
}

bool DragAndDropContainer::performExternalDragDropOfText (const String& text, Component* sourceComp,
                                                          std::function<void()> callback)
{
    if (text.isEmpty())
        return false;

    if (auto* lp = getPeerForDragEvent (sourceComp))
        return lp->externalDragTextInit (text, callback);

    // This method must be called in response to a component's mouseDown or mouseDrag event!
    jassertfalse;
    return false;
}

} // namespace juce