/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_config.h"

#if SDL_VIDEO_DRIVER_X11

#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_mouse_c.h"

#include "SDL_x11video.h"
#include "SDL_x11mouse.h"
#include "SDL_x11shape.h"

#if SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
#include "SDL_x11opengles.h"
#endif

#include "SDL_timer.h"
#include "SDL_syswm.h"

#define _NET_WM_STATE_REMOVE    0l
#define _NET_WM_STATE_ADD       1l
#define _NET_WM_STATE_TOGGLE    2l

static SDL_bool
X11_IsWindowOldFullscreen(_THIS, SDL_Window * window)
{
    SDL_VideoData *videodata = (SDL_VideoData *) _this->driverdata;

    /* ICCCM2.0-compliant window managers can handle fullscreen windows */
    if ((window->flags & SDL_WINDOW_FULLSCREEN) && !videodata->net_wm) {
        return SDL_TRUE;
    } else {
        return SDL_FALSE;
    }
}

static SDL_bool
X11_IsWindowMapped(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    SDL_VideoData *videodata = (SDL_VideoData *) _this->driverdata;
    XWindowAttributes attr;

    XGetWindowAttributes(videodata->display, data->xwindow, &attr);
    if (attr.map_state != IsUnmapped) {
        return SDL_TRUE;
    } else {
        return SDL_FALSE;
    }
}

static int
X11_GetWMStateProperty(_THIS, SDL_Window * window, Atom atoms[3])
{
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    int count = 0;

    if (window->flags & SDL_WINDOW_FULLSCREEN) {
        atoms[count++] = data->_NET_WM_STATE_FULLSCREEN;
    }
    if (window->flags & SDL_WINDOW_MAXIMIZED) {
        atoms[count++] = data->_NET_WM_STATE_MAXIMIZED_VERT;
        atoms[count++] = data->_NET_WM_STATE_MAXIMIZED_HORZ;
    }
    return count;
}

static int
SetupWindowData(_THIS, SDL_Window * window, Window w, BOOL created)
{
    SDL_VideoData *videodata = (SDL_VideoData *) _this->driverdata;
    SDL_WindowData *data;
    int numwindows = videodata->numwindows;
    int windowlistlength = videodata->windowlistlength;
    SDL_WindowData **windowlist = videodata->windowlist;

    /* Allocate the window data */
    data = (SDL_WindowData *) SDL_calloc(1, sizeof(*data));
    if (!data) {
        SDL_OutOfMemory();
        return -1;
    }
    data->window = window;
    data->xwindow = w;
#ifdef X_HAVE_UTF8_STRING
    if (SDL_X11_HAVE_UTF8) {
        data->ic =
            pXCreateIC(videodata->im, XNClientWindow, w, XNFocusWindow, w,
                       XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
                       XNResourceName, videodata->classname, XNResourceClass,
                       videodata->classname, NULL);
    }
#endif
    data->created = created;
    data->videodata = videodata;

    /* Associate the data with the window */

    if (numwindows < windowlistlength) {
        windowlist[numwindows] = data;
        videodata->numwindows++;
    } else {
        windowlist =
            (SDL_WindowData **) SDL_realloc(windowlist,
                                            (numwindows +
                                             1) * sizeof(*windowlist));
        if (!windowlist) {
            SDL_OutOfMemory();
            SDL_free(data);
            return -1;
        }
        windowlist[numwindows] = data;
        videodata->numwindows++;
        videodata->windowlistlength++;
        videodata->windowlist = windowlist;
    }

    /* Fill in the SDL window with the window data */
    {
        XWindowAttributes attrib;

        XGetWindowAttributes(data->videodata->display, w, &attrib);
        window->x = attrib.x;
        window->y = attrib.y;
        window->w = attrib.width;
        window->h = attrib.height;
        if (attrib.map_state != IsUnmapped) {
            window->flags |= SDL_WINDOW_SHOWN;
        } else {
            window->flags &= ~SDL_WINDOW_SHOWN;
        }
        data->visual = attrib.visual;
        data->colormap = attrib.colormap;
    }

    {
        Atom _NET_WM_STATE = data->videodata->_NET_WM_STATE;
        Atom _NET_WM_STATE_MAXIMIZED_VERT = data->videodata->_NET_WM_STATE_MAXIMIZED_VERT;
        Atom _NET_WM_STATE_MAXIMIZED_HORZ = data->videodata->_NET_WM_STATE_MAXIMIZED_HORZ;
        Atom _NET_WM_STATE_FULLSCREEN = data->videodata->_NET_WM_STATE_FULLSCREEN;
        Atom actualType;
        int actualFormat;
        unsigned long i, numItems, bytesAfter;
        unsigned char *propertyValue = NULL;
        long maxLength = 1024;

        if (XGetWindowProperty(data->videodata->display, w, _NET_WM_STATE,
                               0l, maxLength, False, XA_ATOM, &actualType,
                               &actualFormat, &numItems, &bytesAfter,
                               &propertyValue) == Success) {
            Atom *atoms = (Atom *) propertyValue;
            int maximized = 0;
            int fullscreen = 0;

            for (i = 0; i < numItems; ++i) {
                if (atoms[i] == _NET_WM_STATE_MAXIMIZED_VERT) {
                    maximized |= 1;
                } else if (atoms[i] == _NET_WM_STATE_MAXIMIZED_HORZ) {
                    maximized |= 2;
                } else if ( atoms[i] == _NET_WM_STATE_FULLSCREEN) {
                    fullscreen = 1;
                }
            }
            if (maximized == 3) {
                window->flags |= SDL_WINDOW_MAXIMIZED;
            }  else if (fullscreen == 1) {
                window->flags |= SDL_WINDOW_FULLSCREEN;
            }
            XFree(propertyValue);
        }
    }

    {
        Window FocalWindow;
        int RevertTo=0;
        XGetInputFocus(data->videodata->display, &FocalWindow, &RevertTo);
        if (FocalWindow==w)
        {
            window->flags |= SDL_WINDOW_INPUT_FOCUS;
            SDL_SetKeyboardFocus(data->window);
        }

        if (window->flags & SDL_WINDOW_INPUT_GRABBED) {
            /* Tell x11 to clip mouse */
        }
    }

    /* FIXME: How can I tell?
       {
       DWORD style = GetWindowLong(hwnd, GWL_STYLE);
       if (style & WS_VISIBLE) {
       if (style & (WS_BORDER | WS_THICKFRAME)) {
       window->flags &= ~SDL_WINDOW_BORDERLESS;
       } else {
       window->flags |= SDL_WINDOW_BORDERLESS;
       }
       if (style & WS_THICKFRAME) {
       window->flags |= SDL_WINDOW_RESIZABLE;
       } else {
       window->flags &= ~SDL_WINDOW_RESIZABLE;
       }
       if (style & WS_MINIMIZE) {
       window->flags |= SDL_WINDOW_MINIMIZED;
       } else {
       window->flags &= ~SDL_WINDOW_MINIMIZED;
       }
       }
       if (GetFocus() == hwnd) {
       int index = data->videodata->keyboard;
       window->flags |= SDL_WINDOW_INPUT_FOCUS;
       SDL_SetKeyboardFocus(index, data->window);

       if (window->flags & SDL_WINDOW_INPUT_GRABBED) {
       RECT rect;
       GetClientRect(hwnd, &rect);
       ClientToScreen(hwnd, (LPPOINT) & rect);
       ClientToScreen(hwnd, (LPPOINT) & rect + 1);
       ClipCursor(&rect);
       }
       }
     */

    /* All done! */
    window->driverdata = data;
    return 0;
}

int
X11_CreateWindow(_THIS, SDL_Window * window)
{
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    SDL_DisplayData *displaydata =
        (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
    Display *display = data->display;
    int screen = displaydata->screen;
    Visual *visual;
    int depth;
    XSetWindowAttributes xattr;
    Window w;
    XSizeHints sizehints;
    XWMHints wmhints;
    XClassHint classhints;
    Atom _NET_WM_WINDOW_TYPE;
    Atom _NET_WM_WINDOW_TYPE_NORMAL;
    Atom _NET_WM_PID;
    int wmstate_count;
    Atom wmstate_atoms[3];
    Uint32 fevent = 0;

#if SDL_VIDEO_DRIVER_X11_XINERAMA
/* FIXME
    if ( use_xinerama ) {
        x = xinerama_info.x_org;
        y = xinerama_info.y_org;
    }
*/
#endif
#if SDL_VIDEO_OPENGL_GLX
    if (window->flags & SDL_WINDOW_OPENGL) {
        XVisualInfo *vinfo;

        vinfo = X11_GL_GetVisual(_this, display, screen);
        if (!vinfo) {
            return -1;
        }
        visual = vinfo->visual;
        depth = vinfo->depth;
        XFree(vinfo);
    } else
#endif
#if SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
    if (window->flags & SDL_WINDOW_OPENGL) {
        XVisualInfo *vinfo;

        vinfo = X11_GLES_GetVisual(_this, display, screen);
        if (!vinfo) {
            return -1;
        }
        visual = vinfo->visual;
        depth = vinfo->depth;
        XFree(vinfo);
    } else
#endif
    {
        visual = displaydata->visual;
        depth = displaydata->depth;
    }

    xattr.override_redirect = False;
    xattr.background_pixel = 0;
    xattr.border_pixel = 0;

    if (visual->class == DirectColor) {
        XColor *colorcells;
        int i;
        int ncolors;
        int rmax, gmax, bmax;
        int rmask, gmask, bmask;
        int rshift, gshift, bshift;

        xattr.colormap =
            XCreateColormap(display, RootWindow(display, screen),
                            visual, AllocAll);

        /* If we can't create a colormap, then we must die */
        if (!xattr.colormap) {
            SDL_SetError("Could not create writable colormap");
            return -1;
        }

        /* OK, we got a colormap, now fill it in as best as we can */
        colorcells = SDL_malloc(visual->map_entries * sizeof(XColor));
        if (!colorcells) {
            SDL_OutOfMemory();
            return -1;
        }
        ncolors = visual->map_entries;
        rmax = 0xffff;
        gmax = 0xffff;
        bmax = 0xffff;

        rshift = 0;
        rmask = visual->red_mask;
        while (0 == (rmask & 1)) {
            rshift++;
            rmask >>= 1;
        }

        gshift = 0;
        gmask = visual->green_mask;
        while (0 == (gmask & 1)) {
            gshift++;
            gmask >>= 1;
        }

        bshift = 0;
        bmask = visual->blue_mask;
        while (0 == (bmask & 1)) {
            bshift++;
            bmask >>= 1;
        }

        /* build the color table pixel values */
        for (i = 0; i < ncolors; i++) {
            Uint32 red = (rmax * i) / (ncolors - 1);
            Uint32 green = (gmax * i) / (ncolors - 1);
            Uint32 blue = (bmax * i) / (ncolors - 1);

            Uint32 rbits = (rmask * i) / (ncolors - 1);
            Uint32 gbits = (gmask * i) / (ncolors - 1);
            Uint32 bbits = (bmask * i) / (ncolors - 1);

            Uint32 pix =
                (rbits << rshift) | (gbits << gshift) | (bbits << bshift);

            colorcells[i].pixel = pix;

            colorcells[i].red = red;
            colorcells[i].green = green;
            colorcells[i].blue = blue;

            colorcells[i].flags = DoRed | DoGreen | DoBlue;
        }

        XStoreColors(display, xattr.colormap, colorcells, ncolors);

        SDL_free(colorcells);
    } else {
        xattr.colormap =
            XCreateColormap(display, RootWindow(display, screen),
                            visual, AllocNone);
    }

    w = XCreateWindow(display, RootWindow(display, screen),
                      window->x, window->y, window->w, window->h,
                      0, depth, InputOutput, visual,
                      (CWOverrideRedirect | CWBackPixel | CWBorderPixel |
                       CWColormap), &xattr);
    if (!w) {
        SDL_SetError("Couldn't create window");
        return -1;
    }
#if SDL_VIDEO_OPENGL_ES || SDL_VIDEO_OPENGL_ES2
    if (window->flags & SDL_WINDOW_OPENGL) {
        /* Create the GLES window surface */
        _this->gles_data->egl_surface =
            _this->gles_data->eglCreateWindowSurface(_this->gles_data->
                                                 egl_display,
                                                 _this->gles_data->egl_config,
                                                 (NativeWindowType) w, NULL);

        if (_this->gles_data->egl_surface == EGL_NO_SURFACE) {
            SDL_SetError("Could not create GLES window surface");
            return -1;
        }
    }
#endif

    if (window->flags & SDL_WINDOW_BORDERLESS) {
        SDL_bool set;
        Atom WM_HINTS;

        /* We haven't modified the window manager hints yet */
        set = SDL_FALSE;

        /* First try to set MWM hints */
        WM_HINTS = XInternAtom(display, "_MOTIF_WM_HINTS", True);
        if (WM_HINTS != None) {
            /* Hints used by Motif compliant window managers */
            struct
            {
                unsigned long flags;
                unsigned long functions;
                unsigned long decorations;
                long input_mode;
                unsigned long status;
            } MWMHints = {
            (1L << 1), 0, 0, 0, 0};

            XChangeProperty(display, w, WM_HINTS, WM_HINTS, 32,
                            PropModeReplace, (unsigned char *) &MWMHints,
                            sizeof(MWMHints) / 4);
            set = SDL_TRUE;
        }
        /* Now try to set KWM hints */
        WM_HINTS = XInternAtom(display, "KWM_WIN_DECORATION", True);
        if (WM_HINTS != None) {
            long KWMHints = 0;

            XChangeProperty(display, w, WM_HINTS, WM_HINTS, 32,
                            PropModeReplace,
                            (unsigned char *) &KWMHints,
                            sizeof(KWMHints) / 4);
            set = SDL_TRUE;
        }
        /* Now try to set GNOME hints */
        WM_HINTS = XInternAtom(display, "_WIN_HINTS", True);
        if (WM_HINTS != None) {
            long GNOMEHints = 0;

            XChangeProperty(display, w, WM_HINTS, WM_HINTS, 32,
                            PropModeReplace,
                            (unsigned char *) &GNOMEHints,
                            sizeof(GNOMEHints) / 4);
            set = SDL_TRUE;
        }
        /* Finally set the transient hints if necessary */
        if (!set) {
            XSetTransientForHint(display, w, RootWindow(display, screen));
        }
    } else {
        SDL_bool set;
        Atom WM_HINTS;

        /* We haven't modified the window manager hints yet */
        set = SDL_FALSE;

        /* First try to unset MWM hints */
        WM_HINTS = XInternAtom(display, "_MOTIF_WM_HINTS", True);
        if (WM_HINTS != None) {
            XDeleteProperty(display, w, WM_HINTS);
            set = SDL_TRUE;
        }
        /* Now try to unset KWM hints */
        WM_HINTS = XInternAtom(display, "KWM_WIN_DECORATION", True);
        if (WM_HINTS != None) {
            XDeleteProperty(display, w, WM_HINTS);
            set = SDL_TRUE;
        }
        /* Now try to unset GNOME hints */
        WM_HINTS = XInternAtom(display, "_WIN_HINTS", True);
        if (WM_HINTS != None) {
            XDeleteProperty(display, w, WM_HINTS);
            set = SDL_TRUE;
        }
        /* Finally unset the transient hints if necessary */
        if (!set) {
            XDeleteProperty(display, w, XA_WM_TRANSIENT_FOR);
        }
    }

    /* Setup the normal size hints */
    if (!(window->flags & SDL_WINDOW_RESIZABLE)) {
        sizehints.min_width = sizehints.max_width = window->w;
        sizehints.min_height = sizehints.max_height = window->h;
        sizehints.flags = PMaxSize | PMinSize;
    }
    sizehints.x = window->x;
    sizehints.y = window->y;
    sizehints.flags |= USPosition;

    /* Setup the input hints so we get keyboard input */
    wmhints.input = True;
    wmhints.flags = InputHint;

    /* Setup the class hints so we can get an icon (AfterStep) */
    classhints.res_name = data->classname;
    classhints.res_class = data->classname;

    /* Set the size, input and class hints, and define WM_CLIENT_MACHINE and WM_LOCALE_NAME */
    XSetWMProperties(display, w, NULL, NULL, NULL, 0, &sizehints, &wmhints, &classhints);

    /* Set the PID related to the window for the given hostname, if possible */
    if (data->pid > 0) {
        _NET_WM_PID = XInternAtom(display, "_NET_WM_PID", False);
        XChangeProperty(display, w, _NET_WM_PID, XA_CARDINAL, 32, PropModeReplace,
                        (unsigned char *)&data->pid, 1);
    }

    /* Set the window manager state */
    wmstate_count = X11_GetWMStateProperty(_this, window, wmstate_atoms);
    if (wmstate_count > 0) {
        XChangeProperty(display, w, data->_NET_WM_STATE, XA_ATOM, 32,
                        PropModeReplace,
                        (unsigned char *)wmstate_atoms, wmstate_count);
    } else {
        XDeleteProperty(display, w, data->_NET_WM_STATE);
    }

    /* Let the window manager know we're a "normal" window */
    _NET_WM_WINDOW_TYPE = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
    _NET_WM_WINDOW_TYPE_NORMAL = XInternAtom(display, "_NET_WM_WINDOW_TYPE_NORMAL", False);
    XChangeProperty(display, w, _NET_WM_WINDOW_TYPE, XA_ATOM, 32,
                    PropModeReplace,
                    (unsigned char *)&_NET_WM_WINDOW_TYPE_NORMAL, 1);

    /* Allow the window to be deleted by the window manager */
    XSetWMProtocols(display, w, &data->WM_DELETE_WINDOW, 1);

    if (SetupWindowData(_this, window, w, SDL_TRUE) < 0) {
        XDestroyWindow(display, w);
        return -1;
    }

#ifdef X_HAVE_UTF8_STRING
    if (SDL_X11_HAVE_UTF8) {
        pXGetICValues(((SDL_WindowData *) window->driverdata)->ic,
                      XNFilterEvents, &fevent, NULL);
    }
#endif

    XSelectInput(display, w,
                 (FocusChangeMask | EnterWindowMask | LeaveWindowMask |
                 ExposureMask | ButtonPressMask | ButtonReleaseMask |
                 PointerMotionMask | KeyPressMask | KeyReleaseMask |
                 PropertyChangeMask | StructureNotifyMask |
                 KeymapStateMask | fevent));

    XFlush(display);

    return 0;
}

int
X11_CreateWindowFrom(_THIS, SDL_Window * window, const void *data)
{
    Window w = (Window) data;

    window->title = X11_GetWindowTitle(_this, w);

    if (SetupWindowData(_this, window, w, SDL_FALSE) < 0) {
        return -1;
    }
    return 0;
}

char *
X11_GetWindowTitle(_THIS, Window xwindow)
{
    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    Display *display = data->display;
    int status, real_format;
    Atom real_type;
    unsigned long items_read, items_left;
    unsigned char *propdata;
    char *title = NULL;

    status = XGetWindowProperty(display, xwindow, data->_NET_WM_NAME,
                0L, 8192L, False, data->UTF8_STRING, &real_type, &real_format,
                &items_read, &items_left, &propdata);
    if (status == Success && propdata) {
        title = SDL_strdup(SDL_static_cast(char*, propdata));
        XFree(propdata);
    } else {
        status = XGetWindowProperty(display, xwindow, XA_WM_NAME,
                    0L, 8192L, False, XA_STRING, &real_type, &real_format,
                    &items_read, &items_left, &propdata);
        if (status == Success && propdata) {
            title = SDL_iconv_string("UTF-8", "", SDL_static_cast(char*, propdata), items_read+1);
        } else {
            title = SDL_strdup("");
        }
    }
    return title;
}

void
X11_SetWindowTitle(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;
    XTextProperty titleprop, iconprop;
    Status status;
    const char *title = window->title;
    const char *icon = NULL;

#ifdef X_HAVE_UTF8_STRING
    Atom _NET_WM_NAME = data->videodata->_NET_WM_NAME;
    Atom _NET_WM_ICON_NAME = data->videodata->_NET_WM_ICON_NAME;
#endif

    if (title != NULL) {
        char *title_locale = SDL_iconv_utf8_locale(title);
        if (!title_locale) {
            SDL_OutOfMemory();
            return;
        }
        status = XStringListToTextProperty(&title_locale, 1, &titleprop);
        SDL_free(title_locale);
        if (status) {
            XSetTextProperty(display, data->xwindow, &titleprop, XA_WM_NAME);
            XFree(titleprop.value);
        }
#ifdef X_HAVE_UTF8_STRING
        if (SDL_X11_HAVE_UTF8) {
            status =
                Xutf8TextListToTextProperty(display, (char **) &title, 1,
                                            XUTF8StringStyle, &titleprop);
            if (status == Success) {
                XSetTextProperty(display, data->xwindow, &titleprop,
                                 _NET_WM_NAME);
                XFree(titleprop.value);
            }
        }
#endif
    }
    if (icon != NULL) {
        char *icon_locale = SDL_iconv_utf8_locale(icon);
        if (!icon_locale) {
            SDL_OutOfMemory();
            return;
        }
        status = XStringListToTextProperty(&icon_locale, 1, &iconprop);
        SDL_free(icon_locale);
        if (status) {
            XSetTextProperty(display, data->xwindow, &iconprop,
                             XA_WM_ICON_NAME);
            XFree(iconprop.value);
        }
#ifdef X_HAVE_UTF8_STRING
        if (SDL_X11_HAVE_UTF8) {
            status =
                Xutf8TextListToTextProperty(display, (char **) &icon, 1,
                                            XUTF8StringStyle, &iconprop);
            if (status == Success) {
                XSetTextProperty(display, data->xwindow, &iconprop,
                                 _NET_WM_ICON_NAME);
                XFree(iconprop.value);
            }
        }
#endif
    }
    XFlush(display);
}

void
X11_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;
    Atom _NET_WM_ICON = data->videodata->_NET_WM_ICON;

    if (icon) {
        SDL_PixelFormat format;
        SDL_Surface *surface;
        int propsize;
        long *propdata;

        /* Convert the icon to ARGB for modern window managers */
        SDL_InitFormat(&format, SDL_PIXELFORMAT_ARGB8888);
        surface = SDL_ConvertSurface(icon, &format, 0);
        if (!surface) {
            return;
        }

        /* Set the _NET_WM_ICON property */
        propsize = 2 + (icon->w * icon->h);
        propdata = SDL_malloc(propsize * sizeof(long));
        if (propdata) {
            int x, y;
            Uint32 *src;
            long *dst;

            propdata[0] = icon->w;
            propdata[1] = icon->h;
            dst = &propdata[2];
            for (y = 0; y < icon->h; ++y) {
                src = (Uint32*)((Uint8*)surface->pixels + y * surface->pitch);
                for (x = 0; x < icon->w; ++x) {
                    *dst++ = *src++;
                }
            }
            XChangeProperty(display, data->xwindow, _NET_WM_ICON, XA_CARDINAL,
                            32, PropModeReplace, (unsigned char *) propdata,
                            propsize);
        }
        SDL_FreeSurface(surface);
    } else {
        XDeleteProperty(display, data->xwindow, _NET_WM_ICON);
    }
    XFlush(display);
}

void
X11_SetWindowPosition(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    XMoveWindow(display, data->xwindow, window->x, window->y);
    XFlush(display);
}

void
X11_SetWindowSize(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    if (SDL_IsShapedWindow(window))
        X11_ResizeWindowShape(window);
    if (!(window->flags & SDL_WINDOW_RESIZABLE)) {
         /* Apparently, if the X11 Window is set to a 'non-resizable' window, you cannot resize it using the XResizeWindow, thus
            we must set the size hints to adjust the window size.*/
         XSizeHints *sizehints = XAllocSizeHints();
         long userhints;

         XGetWMNormalHints(display, data->xwindow, sizehints, &userhints);

         sizehints->min_width = sizehints->max_height = window->w;
         sizehints->min_height = sizehints->max_height = window->h;

         XSetWMNormalHints(display, data->xwindow, sizehints);

         XFree(sizehints);
    } else
        XResizeWindow(display, data->xwindow, window->w, window->h);
    XFlush(display);
}

void
X11_ShowWindow(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    XMapRaised(display, data->xwindow);
    XFlush(display);
}

void
X11_HideWindow(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    XUnmapWindow(display, data->xwindow);
    XFlush(display);
}

void
X11_RaiseWindow(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    XRaiseWindow(display, data->xwindow);
    XFlush(display);
}

static void
SetWindowMaximized(_THIS, SDL_Window * window, SDL_bool maximized)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    SDL_DisplayData *displaydata =
        (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
    Display *display = data->videodata->display;
    Atom _NET_WM_STATE = data->videodata->_NET_WM_STATE;
    Atom _NET_WM_STATE_MAXIMIZED_VERT = data->videodata->_NET_WM_STATE_MAXIMIZED_VERT;
    Atom _NET_WM_STATE_MAXIMIZED_HORZ = data->videodata->_NET_WM_STATE_MAXIMIZED_HORZ;
    Atom _NET_WM_STATE_FULLSCREEN = data->videodata->_NET_WM_STATE_FULLSCREEN;

    if (X11_IsWindowMapped(_this, window)) {
        XEvent e;

        SDL_zero(e);
        e.xany.type = ClientMessage;
        e.xclient.message_type = _NET_WM_STATE;
        e.xclient.format = 32;
        e.xclient.window = data->xwindow;
        e.xclient.data.l[0] =
            maximized ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
        e.xclient.data.l[1] = _NET_WM_STATE_MAXIMIZED_VERT;
        e.xclient.data.l[2] = _NET_WM_STATE_MAXIMIZED_HORZ;
        e.xclient.data.l[3] = 0l;

        XSendEvent(display, RootWindow(display, displaydata->screen), 0,
                   SubstructureNotifyMask | SubstructureRedirectMask, &e);
    } else {
        int count = 0;
        Atom atoms[3];

        if (window->flags & SDL_WINDOW_FULLSCREEN) {
            atoms[count++] = _NET_WM_STATE_FULLSCREEN;
        }
        if (maximized) {
            atoms[count++] = _NET_WM_STATE_MAXIMIZED_VERT;
            atoms[count++] = _NET_WM_STATE_MAXIMIZED_HORZ;
        }
        if (count > 0) {
            XChangeProperty(display, data->xwindow, _NET_WM_STATE, XA_ATOM, 32,
                            PropModeReplace, (unsigned char *)atoms, count);
        } else {
            XDeleteProperty(display, data->xwindow, _NET_WM_STATE);
        }
    }
    XFlush(display);
}

void
X11_MaximizeWindow(_THIS, SDL_Window * window)
{
    SetWindowMaximized(_this, window, SDL_TRUE);
}

void
X11_MinimizeWindow(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    SDL_DisplayData *displaydata =
        (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
    Display *display = data->videodata->display;
 
    XIconifyWindow(display, data->xwindow, displaydata->screen);
    XFlush(display);
}

void
X11_RestoreWindow(_THIS, SDL_Window * window)
{
    SetWindowMaximized(_this, window, SDL_FALSE);
    X11_ShowWindow(_this, window);
}

void
X11_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * _display, SDL_bool fullscreen)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    SDL_DisplayData *displaydata = (SDL_DisplayData *) _display->driverdata;
    Display *display = data->videodata->display;
    Atom _NET_WM_STATE = data->videodata->_NET_WM_STATE;
    Atom _NET_WM_STATE_MAXIMIZED_VERT = data->videodata->_NET_WM_STATE_MAXIMIZED_VERT;
    Atom _NET_WM_STATE_MAXIMIZED_HORZ = data->videodata->_NET_WM_STATE_MAXIMIZED_HORZ;
    Atom _NET_WM_STATE_FULLSCREEN = data->videodata->_NET_WM_STATE_FULLSCREEN;

    if (X11_IsWindowMapped(_this, window)) {
        XEvent e;

        SDL_zero(e);
        e.xany.type = ClientMessage;
        e.xclient.message_type = _NET_WM_STATE;
        e.xclient.format = 32;
        e.xclient.window = data->xwindow;
        e.xclient.data.l[0] =
            fullscreen ? _NET_WM_STATE_ADD : _NET_WM_STATE_REMOVE;
        e.xclient.data.l[1] = _NET_WM_STATE_FULLSCREEN;
        e.xclient.data.l[3] = 0l;

        XSendEvent(display, RootWindow(display, displaydata->screen), 0,
                   SubstructureNotifyMask | SubstructureRedirectMask, &e);
    } else {
        int count = 0;
        Atom atoms[3];

        if (fullscreen) {
            atoms[count++] = _NET_WM_STATE_FULLSCREEN;
        }
        if (window->flags & SDL_WINDOW_MAXIMIZED) {
            atoms[count++] = _NET_WM_STATE_MAXIMIZED_VERT;
            atoms[count++] = _NET_WM_STATE_MAXIMIZED_HORZ;
        }
        if (count > 0) {
            XChangeProperty(display, data->xwindow, _NET_WM_STATE, XA_ATOM, 32,
                            PropModeReplace, (unsigned char *)atoms, count);
        } else {
            XDeleteProperty(display, data->xwindow, _NET_WM_STATE);
        }
    }
    XFlush(display);
}

int
X11_SetWindowGammaRamp(_THIS, SDL_Window * window, const Uint16 * ramp)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;
    Visual *visual = data->visual;
    Colormap colormap = data->colormap;
    XColor *colorcells;
    int ncolors;
    int rmask, gmask, bmask;
    int rshift, gshift, bshift;
    int i;

    if (visual->class != DirectColor) {
        SDL_SetError("Window doesn't have DirectColor visual");
        return -1;
    }

    ncolors = visual->map_entries;
    colorcells = SDL_malloc(ncolors * sizeof(XColor));
    if (!colorcells) {
        SDL_OutOfMemory();
        return -1;
    }

    rshift = 0;
    rmask = visual->red_mask;
    while (0 == (rmask & 1)) {
        rshift++;
        rmask >>= 1;
    }

    gshift = 0;
    gmask = visual->green_mask;
    while (0 == (gmask & 1)) {
        gshift++;
        gmask >>= 1;
    }

    bshift = 0;
    bmask = visual->blue_mask;
    while (0 == (bmask & 1)) {
        bshift++;
        bmask >>= 1;
    }

    /* build the color table pixel values */
    for (i = 0; i < ncolors; i++) {
        Uint32 rbits = (rmask * i) / (ncolors - 1);
        Uint32 gbits = (gmask * i) / (ncolors - 1);
        Uint32 bbits = (bmask * i) / (ncolors - 1);
        Uint32 pix = (rbits << rshift) | (gbits << gshift) | (bbits << bshift);

        colorcells[i].pixel = pix;

        colorcells[i].red = ramp[(0 * 256) + i];
        colorcells[i].green = ramp[(1 * 256) + i];
        colorcells[i].blue = ramp[(2 * 256) + i];

        colorcells[i].flags = DoRed | DoGreen | DoBlue;
    }

    XStoreColors(display, colormap, colorcells, ncolors);
    XFlush(display);
    SDL_free(colorcells);

    return 0;
}

void
X11_SetWindowGrab(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;
    SDL_bool oldstyle_fullscreen;

    /* ICCCM2.0-compliant window managers can handle fullscreen windows */
    oldstyle_fullscreen = X11_IsWindowOldFullscreen(_this, window);

    if (((window->flags & SDL_WINDOW_INPUT_GRABBED) || oldstyle_fullscreen)
        && (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
        /* Try to grab the mouse */
        for (;;) {
            int result =
                XGrabPointer(display, data->xwindow, True, 0, GrabModeAsync,
                             GrabModeAsync, data->xwindow, None, CurrentTime);
            if (result == GrabSuccess) {
                break;
            }
            SDL_Delay(100);
        }

        /* Raise the window if we grab the mouse */
        XRaiseWindow(display, data->xwindow);

        /* Now grab the keyboard */
        XGrabKeyboard(display, data->xwindow, True, GrabModeAsync,
                      GrabModeAsync, CurrentTime);
    } else {
        XUngrabPointer(display, CurrentTime);
        XUngrabKeyboard(display, CurrentTime);
    }
}

void
X11_DestroyWindow(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    window->driverdata = NULL;

    if (data) {
        SDL_VideoData *videodata = (SDL_VideoData *) data->videodata;
        Display *display = videodata->display;
        int numwindows = videodata->numwindows;
        SDL_WindowData **windowlist = videodata->windowlist;
        int i;

        if (windowlist) {
            for (i = 0; i < numwindows; ++i) {
                if (windowlist[i] && (windowlist[i]->window == window)) {
                    windowlist[i] = windowlist[numwindows - 1];
                    windowlist[numwindows - 1] = NULL;
                    videodata->numwindows--;
                    break;
                }
            }
        }
#ifdef X_HAVE_UTF8_STRING
        if (data->ic) {
            XDestroyIC(data->ic);
        }
#endif
        if (data->created) {
            XDestroyWindow(display, data->xwindow);
            XFlush(display);
        }
        SDL_free(data);
    }
}

SDL_bool
X11_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
{
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    if (info->version.major == SDL_MAJOR_VERSION &&
        info->version.minor == SDL_MINOR_VERSION) {
        info->subsystem = SDL_SYSWM_X11;
        info->info.x11.display = display;
        info->info.x11.window = data->xwindow;
        return SDL_TRUE;
    } else {
        SDL_SetError("Application not compiled with SDL %d.%d\n",
                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
        return SDL_FALSE;
    }
}

#endif /* SDL_VIDEO_DRIVER_X11 */

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