source: vbox/trunk/src/VBox/RDP/client/ewmhints.c@ 50926

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.

   Support functions for Extended Window Manager Hints,
   http://www.freedesktop.org/wiki/Standards_2fwm_2dspec

   Copyright 2005-2011 Peter Astrand <astrand@cendio.se> for Cendio AB
   Copyright 2007 Pierre Ossman <ossman@cendio.se> for Cendio AB

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
 * Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
 * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
 * the General Public License version 2 (GPLv2) at this time for any software where
 * a choice of GPL license versions is made available with the language indicating
 * that GPLv2 or any later version may be used, or where a choice of which version
 * of the GPL is applied is otherwise unspecified.
 */

#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include "rdesktop.h"

#define _NET_WM_STATE_REMOVE        0   /* remove/unset property */
#define _NET_WM_STATE_ADD           1   /* add/set property */
#define _NET_WM_STATE_TOGGLE        2   /* toggle property  */

extern Display *g_display;

static Atom g_net_wm_state_maximized_vert_atom, g_net_wm_state_maximized_horz_atom,
        g_net_wm_state_hidden_atom, g_net_wm_name_atom, g_utf8_string_atom,
        g_net_wm_state_skip_taskbar_atom, g_net_wm_state_skip_pager_atom,
        g_net_wm_state_modal_atom, g_net_wm_icon_atom, g_net_wm_state_above_atom;

Atom g_net_wm_state_atom, g_net_wm_desktop_atom;

/* 
   Get window property value (32 bit format) 
   Returns zero on success, -1 on error
*/
static int
get_property_value(Window wnd, char *propname, long max_length,
                   unsigned long *nitems_return, unsigned char **prop_return, int nowarn)
{
        int result;
        Atom property;
        Atom actual_type_return;
        int actual_format_return;
        unsigned long bytes_after_return;

        property = XInternAtom(g_display, propname, True);
        if (property == None)
        {
                fprintf(stderr, "Atom %s does not exist\n", propname);
                return (-1);
        }

        result = XGetWindowProperty(g_display, wnd, property, 0,        /* long_offset */
                                    max_length, /* long_length */
                                    False,      /* delete */
                                    AnyPropertyType,    /* req_type */
                                    &actual_type_return,
                                    &actual_format_return,
                                    nitems_return, &bytes_after_return, prop_return);

        if (result != Success)
        {
                fprintf(stderr, "XGetWindowProperty failed\n");
                return (-1);
        }

        if (actual_type_return == None || actual_format_return == 0)
        {
                if (!nowarn)
                        fprintf(stderr, "Window is missing property %s\n", propname);
                return (-1);
        }

        if (bytes_after_return)
        {
                fprintf(stderr, "%s is too big for me\n", propname);
                return (-1);
        }

        if (actual_format_return != 32)
        {
                fprintf(stderr, "%s has bad format\n", propname);
                return (-1);
        }

        return (0);
}

/* 
   Get current desktop number
   Returns -1 on error
*/
static int
get_current_desktop(void)
{
        unsigned long nitems_return;
        unsigned char *prop_return;
        int current_desktop;

        if (get_property_value
            (DefaultRootWindow(g_display), "_NET_CURRENT_DESKTOP", 1, &nitems_return,
             &prop_return, 0) < 0)
                return (-1);

        if (nitems_return != 1)
        {
                fprintf(stderr, "_NET_CURRENT_DESKTOP has bad length\n");
                return (-1);
        }

        current_desktop = *prop_return;
        XFree(prop_return);
        return current_desktop;
}

/*
  Get workarea geometry
  Returns zero on success, -1 on error
 */

int
get_current_workarea(uint32 * x, uint32 * y, uint32 * width, uint32 * height)
{
        int current_desktop;
        unsigned long nitems_return;
        unsigned char *prop_return;
        long *return_words;
        const uint32 net_workarea_x_offset = 0;
        const uint32 net_workarea_y_offset = 1;
        const uint32 net_workarea_width_offset = 2;
        const uint32 net_workarea_height_offset = 3;
        const uint32 max_prop_length = 32 * 4;  /* Max 32 desktops */

        if (get_property_value
            (DefaultRootWindow(g_display), "_NET_WORKAREA", max_prop_length, &nitems_return,
             &prop_return, 0) < 0)
                return (-1);

        if (nitems_return % 4)
        {
                fprintf(stderr, "_NET_WORKAREA has odd length\n");
                return (-1);
        }

        current_desktop = get_current_desktop();

        if (current_desktop < 0)
                return -1;

        return_words = (long *) prop_return;

        *x = return_words[current_desktop * 4 + net_workarea_x_offset];
        *y = return_words[current_desktop * 4 + net_workarea_y_offset];
        *width = return_words[current_desktop * 4 + net_workarea_width_offset];
        *height = return_words[current_desktop * 4 + net_workarea_height_offset];

        XFree(prop_return);

        return (0);

}



void
ewmh_init()
{
        /* FIXME: Use XInternAtoms */
        g_net_wm_state_maximized_vert_atom =
                XInternAtom(g_display, "_NET_WM_STATE_MAXIMIZED_VERT", False);
        g_net_wm_state_maximized_horz_atom =
                XInternAtom(g_display, "_NET_WM_STATE_MAXIMIZED_HORZ", False);
        g_net_wm_state_hidden_atom = XInternAtom(g_display, "_NET_WM_STATE_HIDDEN", False);
        g_net_wm_state_skip_taskbar_atom =
                XInternAtom(g_display, "_NET_WM_STATE_SKIP_TASKBAR", False);
        g_net_wm_state_skip_pager_atom = XInternAtom(g_display, "_NET_WM_STATE_SKIP_PAGER", False);
        g_net_wm_state_modal_atom = XInternAtom(g_display, "_NET_WM_STATE_MODAL", False);
        g_net_wm_state_above_atom = XInternAtom(g_display, "_NET_WM_STATE_ABOVE", False);
        g_net_wm_state_atom = XInternAtom(g_display, "_NET_WM_STATE", False);
        g_net_wm_desktop_atom = XInternAtom(g_display, "_NET_WM_DESKTOP", False);
        g_net_wm_name_atom = XInternAtom(g_display, "_NET_WM_NAME", False);
        g_net_wm_icon_atom = XInternAtom(g_display, "_NET_WM_ICON", False);
        g_utf8_string_atom = XInternAtom(g_display, "UTF8_STRING", False);
}


/* 
   Get the window state: normal/minimized/maximized. 
*/
#ifndef MAKE_PROTO
int
ewmh_get_window_state(Window w)
{
        unsigned long nitems_return;
        unsigned char *prop_return;
        uint32 *return_words;
        unsigned long item;
        RD_BOOL maximized_vert, maximized_horz, hidden;

        maximized_vert = maximized_horz = hidden = False;

        if (get_property_value(w, "_NET_WM_STATE", 64, &nitems_return, &prop_return, 0) < 0)
                return SEAMLESSRDP_NORMAL;

        return_words = (uint32 *) prop_return;

        for (item = 0; item < nitems_return; item++)
        {
                if (return_words[item] == g_net_wm_state_maximized_vert_atom)
                        maximized_vert = True;
                if (return_words[item] == g_net_wm_state_maximized_horz_atom)
                        maximized_horz = True;
                if (return_words[item] == g_net_wm_state_hidden_atom)
                        hidden = True;
        }

        XFree(prop_return);

        if (maximized_vert && maximized_horz)
                return SEAMLESSRDP_MAXIMIZED;
        else if (hidden)
                return SEAMLESSRDP_MINIMIZED;
        else
                return SEAMLESSRDP_NORMAL;
}

static int
ewmh_modify_state(Window wnd, int add, Atom atom1, Atom atom2)
{
        Status status;
        XEvent xevent;

        int result;
        unsigned long nitems;
        unsigned char *props;
        uint32 state = WithdrawnState;

        /* The spec states that the window manager must respect any
           _NET_WM_STATE attributes on a withdrawn window. In order words, we
           modify the attributes directly for withdrawn windows and ask the WM
           to do it for active windows. */
        result = get_property_value(wnd, "WM_STATE", 64, &nitems, &props, 1);
        if ((result >= 0) && nitems)
        {
                state = *(uint32 *) props;
                XFree(props);
        }

        if (state == WithdrawnState)
        {
                if (add)
                {
                        Atom atoms[2];

                        atoms[0] = atom1;
                        nitems = 1;
                        if (atom2)
                        {
                                atoms[1] = atom2;
                                nitems = 2;
                        }

                        XChangeProperty(g_display, wnd, g_net_wm_state_atom, XA_ATOM,
                                        32, PropModeAppend, (unsigned char *) atoms, nitems);
                }
                else
                {
                        Atom *atoms;
                        int i;

                        if (get_property_value(wnd, "_NET_WM_STATE", 64, &nitems, &props, 1) < 0)
                                return 0;

                        atoms = (Atom *) props;

                        for (i = 0; i < nitems; i++)
                        {
                                if ((atoms[i] == atom1) || (atom2 && (atoms[i] == atom2)))
                                {
                                        if (i != (nitems - 1))
                                                memmove(&atoms[i], &atoms[i + 1],
                                                        sizeof(Atom) * (nitems - i - 1));
                                        nitems--;
                                        i--;
                                }
                        }

                        XChangeProperty(g_display, wnd, g_net_wm_state_atom, XA_ATOM,
                                        32, PropModeReplace, (unsigned char *) atoms, nitems);

                        XFree(props);
                }

                return 0;
        }

        xevent.type = ClientMessage;
        xevent.xclient.window = wnd;
        xevent.xclient.message_type = g_net_wm_state_atom;
        xevent.xclient.format = 32;
        if (add)
                xevent.xclient.data.l[0] = _NET_WM_STATE_ADD;
        else
                xevent.xclient.data.l[0] = _NET_WM_STATE_REMOVE;
        xevent.xclient.data.l[1] = atom1;
        xevent.xclient.data.l[2] = atom2;
        xevent.xclient.data.l[3] = 0;
        xevent.xclient.data.l[4] = 0;
        status = XSendEvent(g_display, DefaultRootWindow(g_display), False,
                            SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
        if (!status)
                return -1;

        return 0;
}

/* 
   Set the window state: normal/minimized/maximized. 
   Returns -1 on failure. 
*/
int
ewmh_change_state(Window wnd, int state)
{
        /*
         * Deal with the max atoms
         */
        if (state == SEAMLESSRDP_MAXIMIZED)
        {
                if (ewmh_modify_state
                    (wnd, 1, g_net_wm_state_maximized_vert_atom,
                     g_net_wm_state_maximized_horz_atom) < 0)
                        return -1;
        }
        else
        {
                if (ewmh_modify_state
                    (wnd, 0, g_net_wm_state_maximized_vert_atom,
                     g_net_wm_state_maximized_horz_atom) < 0)
                        return -1;
        }

        return 0;
}


int
ewmh_get_window_desktop(Window wnd)
{
        unsigned long nitems_return;
        unsigned char *prop_return;
        int desktop;

        if (get_property_value(wnd, "_NET_WM_DESKTOP", 1, &nitems_return, &prop_return, 0) < 0)
                return (-1);

        if (nitems_return != 1)
        {
                fprintf(stderr, "_NET_WM_DESKTOP has bad length\n");
                return (-1);
        }

        desktop = *prop_return;
        XFree(prop_return);
        return desktop;
}


int
ewmh_move_to_desktop(Window wnd, unsigned int desktop)
{
        Status status;
        XEvent xevent;

        xevent.type = ClientMessage;
        xevent.xclient.window = wnd;
        xevent.xclient.message_type = g_net_wm_desktop_atom;
        xevent.xclient.format = 32;
        xevent.xclient.data.l[0] = desktop;
        xevent.xclient.data.l[1] = 0;
        xevent.xclient.data.l[2] = 0;
        xevent.xclient.data.l[3] = 0;
        xevent.xclient.data.l[4] = 0;
        status = XSendEvent(g_display, DefaultRootWindow(g_display), False,
                            SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
        if (!status)
                return -1;

        return 0;
}

void
ewmh_set_wm_name(Window wnd, const char *title)
{
        int len;

        len = strlen(title);
        XChangeProperty(g_display, wnd, g_net_wm_name_atom, g_utf8_string_atom,
                        8, PropModeReplace, (unsigned char *) title, len);
}


int
ewmh_set_window_popup(Window wnd)
{
        if (ewmh_modify_state
            (wnd, 1, g_net_wm_state_skip_taskbar_atom, g_net_wm_state_skip_pager_atom) < 0)
                return -1;
        return 0;
}

int
ewmh_set_window_modal(Window wnd)
{
        if (ewmh_modify_state(wnd, 1, g_net_wm_state_modal_atom, 0) < 0)
                return -1;
        return 0;
}

void
ewmh_set_icon(Window wnd, int width, int height, const char *rgba_data)
{
        unsigned long nitems, i;
        unsigned char *props;
        unsigned long *cur_set, *new_set;
        unsigned long *icon;

        cur_set = NULL;
        new_set = NULL;

        if (get_property_value(wnd, "_NET_WM_ICON", 10000, &nitems, &props, 1) >= 0)
        {
                cur_set = (unsigned long *) props;

                for (i = 0; i < nitems;)
                {
                        if (cur_set[i] == width && cur_set[i + 1] == height)
                                break;

                        i += 2 + cur_set[i] * cur_set[i + 1];
                }

                if (i != nitems)
                        icon = cur_set + i;
                else
                {
                        new_set = xmalloc((nitems + width * height + 2) * sizeof(unsigned long));
                        memcpy(new_set, cur_set, nitems * sizeof(unsigned long));
                        icon = new_set + nitems;
                        nitems += width * height + 2;
                }
        }
        else
        {
                new_set = xmalloc((width * height + 2) * sizeof(unsigned long));
                icon = new_set;
                nitems = width * height + 2;
        }

        icon[0] = width;
        icon[1] = height;

        /* Convert RGBA -> ARGB */
        for (i = 0; i < width * height; i++)
        {
                icon[i + 2] =
                        rgba_data[i * 4 + 3] << 24 |
                        ((rgba_data[i * 4 + 0] << 16) & 0x00FF0000) |
                        ((rgba_data[i * 4 + 1] << 8) & 0x0000FF00) |
                        ((rgba_data[i * 4 + 2] << 0) & 0x000000FF);
        }

        XChangeProperty(g_display, wnd, g_net_wm_icon_atom, XA_CARDINAL, 32,
                        PropModeReplace, (unsigned char *) (new_set ? new_set : cur_set), nitems);

        if (cur_set)
                XFree(cur_set);
        if (new_set)
                xfree(new_set);
}

void
ewmh_del_icon(Window wnd, int width, int height)
{
        unsigned long nitems, i, icon_size;
        unsigned char *props;
        unsigned long *cur_set, *new_set;

        cur_set = NULL;
        new_set = NULL;

        if (get_property_value(wnd, "_NET_WM_ICON", 10000, &nitems, &props, 1) < 0)
                return;

        cur_set = (unsigned long *) props;

        for (i = 0; i < nitems;)
        {
                if (cur_set[i] == width && cur_set[i + 1] == height)
                        break;

                i += 2 + cur_set[i] * cur_set[i + 1];
        }

        if (i == nitems)
                goto out;

        icon_size = width * height + 2;
        new_set = xmalloc((nitems - icon_size) * sizeof(unsigned long));

        if (i != 0)
                memcpy(new_set, cur_set, i * sizeof(unsigned long));
        if (i != nitems - icon_size)
                memcpy(new_set + i, cur_set + i + icon_size,
                       (nitems - (i + icon_size)) * sizeof(unsigned long));

        nitems -= icon_size;

        XChangeProperty(g_display, wnd, g_net_wm_icon_atom, XA_CARDINAL, 32,
                        PropModeReplace, (unsigned char *) new_set, nitems);

        xfree(new_set);

      out:
        XFree(cur_set);
}

int
ewmh_set_window_above(Window wnd)
{
        if (ewmh_modify_state(wnd, 1, g_net_wm_state_above_atom, 0) < 0)
                return -1;
        return 0;
}

#endif /* MAKE_PROTO */


#if 0

/* FIXME: _NET_MOVERESIZE_WINDOW is for pagers, not for
   applications. We should implement _NET_WM_MOVERESIZE instead */

int
ewmh_net_moveresize_window(Window wnd, int x, int y, int width, int height)
{
        Status status;
        XEvent xevent;
        Atom moveresize;

        moveresize = XInternAtom(g_display, "_NET_MOVERESIZE_WINDOW", False);
        if (!moveresize)
        {
                return -1;
        }

        xevent.type = ClientMessage;
        xevent.xclient.window = wnd;
        xevent.xclient.message_type = moveresize;
        xevent.xclient.format = 32;
        xevent.xclient.data.l[0] = StaticGravity | (1 << 8) | (1 << 9) | (1 << 10) | (1 << 11);
        xevent.xclient.data.l[1] = x;
        xevent.xclient.data.l[2] = y;
        xevent.xclient.data.l[3] = width;
        xevent.xclient.data.l[4] = height;

        status = XSendEvent(g_display, DefaultRootWindow(g_display), False,
                            SubstructureNotifyMask | SubstructureRedirectMask, &xevent);
        if (!status)
                return -1;
        return 0;
}

#endif