Archipelago » qemu

/*

 * GTK UI

 *

 * Copyright IBM, Corp. 2012

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 * Portions from gtk-vnc:

 *

 * GTK VNC Widget

 *

 * Copyright (C) 2006  Anthony Liguori <anthony@codemonkey.ws>

 * Copyright (C) 2009-2010 Daniel P. Berrange <dan@berrange.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.0 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA

 */

#define GETTEXT_PACKAGE "qemu"

#define LOCALEDIR "po"

#include "qemu-common.h"

#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE

/* Work around an -Wstrict-prototypes warning in GTK headers */

#pragma GCC diagnostic ignored "-Wstrict-prototypes"

#endif

#include <gtk/gtk.h>

#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE

#pragma GCC diagnostic error "-Wstrict-prototypes"

#endif

#include <gdk/gdkkeysyms.h>

#include <glib/gi18n.h>

#include <locale.h>

#include <vte/vte.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/un.h>

#include <sys/wait.h>

#include <pty.h>

#include <math.h>

#include "ui/console.h"

#include "sysemu/sysemu.h"

#include "qmp-commands.h"

#include "x_keymap.h"

#include "keymaps.h"

#include "char/char.h"

//#define DEBUG_GTK

#ifdef DEBUG_GTK

#define DPRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__)

#else

#define DPRINTF(fmt, ...) do { } while (0)

#endif

#define MAX_VCS 10

/* Compatibility define to let us build on both Gtk2 and Gtk3 */

#if GTK_CHECK_VERSION(3, 0, 0)

static inline void gdk_drawable_get_size(GdkWindow *w, gint *ww, gint *wh)

{

    *ww = gdk_window_get_width(w);

    *wh = gdk_window_get_height(w);

}

#endif

#if !GTK_CHECK_VERSION(2, 20, 0)

#define gtk_widget_get_realized(widget) GTK_WIDGET_REALIZED(widget)

#endif

#ifndef GDK_KEY_0

#define GDK_KEY_0 GDK_0

#define GDK_KEY_1 GDK_1

#define GDK_KEY_2 GDK_2

#define GDK_KEY_f GDK_f

#define GDK_KEY_g GDK_g

#define GDK_KEY_plus GDK_plus

#define GDK_KEY_minus GDK_minus

#endif

static const int modifier_keycode[] = {

    /* shift, control, alt keys, meta keys, both left & right */

    0x2a, 0x36, 0x1d, 0x9d, 0x38, 0xb8, 0xdb, 0xdd,

};

typedef struct VirtualConsole

{

    GtkWidget *menu_item;

    GtkWidget *terminal;

    GtkWidget *scrolled_window;

    CharDriverState *chr;

    int fd;

} VirtualConsole;

typedef struct GtkDisplayState

{

    GtkWidget *window;

    GtkWidget *menu_bar;

    GtkAccelGroup *accel_group;

    GtkWidget *machine_menu_item;

    GtkWidget *machine_menu;

    GtkWidget *pause_item;

    GtkWidget *reset_item;

    GtkWidget *powerdown_item;

    GtkWidget *quit_item;

    GtkWidget *view_menu_item;

    GtkWidget *view_menu;

    GtkWidget *full_screen_item;

    GtkWidget *zoom_in_item;

    GtkWidget *zoom_out_item;

    GtkWidget *zoom_fixed_item;

    GtkWidget *zoom_fit_item;

    GtkWidget *grab_item;

    GtkWidget *grab_on_hover_item;

    GtkWidget *vga_item;

    int nb_vcs;

    VirtualConsole vc[MAX_VCS];

    GtkWidget *show_tabs_item;

    GtkWidget *vbox;

    GtkWidget *notebook;

    GtkWidget *drawing_area;

    cairo_surface_t *surface;

    DisplayChangeListener dcl;

    DisplaySurface *ds;

    int button_mask;

    int last_x;

    int last_y;

    double scale_x;

    double scale_y;

    gboolean full_screen;

    GdkCursor *null_cursor;

    Notifier mouse_mode_notifier;

    gboolean free_scale;

    bool external_pause_update;

    bool modifier_pressed[ARRAY_SIZE(modifier_keycode)];

} GtkDisplayState;

static GtkDisplayState *global_state;

/** Utility Functions **/

static bool gd_is_grab_active(GtkDisplayState *s)

{

    return gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->grab_item));

}

static bool gd_grab_on_hover(GtkDisplayState *s)

{

    return gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->grab_on_hover_item));

}

static bool gd_on_vga(GtkDisplayState *s)

{

    return gtk_notebook_get_current_page(GTK_NOTEBOOK(s->notebook)) == 0;

}

static void gd_update_cursor(GtkDisplayState *s, gboolean override)

{

    GdkWindow *window;

    bool on_vga;

    window = gtk_widget_get_window(GTK_WIDGET(s->drawing_area));

    on_vga = gd_on_vga(s);

    if ((override || on_vga) &&

        (s->full_screen || kbd_mouse_is_absolute() || gd_is_grab_active(s))) {

        gdk_window_set_cursor(window, s->null_cursor);

    } else {

        gdk_window_set_cursor(window, NULL);

    }

}

static void gd_update_caption(GtkDisplayState *s)

{

    const char *status = "";

    gchar *title;

    const char *grab = "";

    bool is_paused = !runstate_is_running();

    if (gd_is_grab_active(s)) {

        grab = " - Press Ctrl+Alt+G to release grab";

    }

    if (is_paused) {

        status = " [Paused]";

    }

    s->external_pause_update = true;

    gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->pause_item),

                                   is_paused);

    s->external_pause_update = false;

    if (qemu_name) {

        title = g_strdup_printf("QEMU (%s)%s%s", qemu_name, status, grab);

    } else {

        title = g_strdup_printf("QEMU%s%s", status, grab);

    }

    gtk_window_set_title(GTK_WINDOW(s->window), title);

    g_free(title);

}

static void gd_update_windowsize(GtkDisplayState *s)

{

    if (!s->full_screen) {

        GtkRequisition req;

        double sx, sy;

        if (s->free_scale) {

            sx = s->scale_x;

            sy = s->scale_y;

            s->scale_y = 1.0;

            s->scale_x = 1.0;

        } else {

            sx = 1.0;

            sy = 1.0;

        }

        gtk_widget_set_size_request(s->drawing_area,

                                    surface_width(s->ds) * s->scale_x,

                                    surface_height(s->ds) * s->scale_y);

#if GTK_CHECK_VERSION(3, 0, 0)

        gtk_widget_get_preferred_size(s->vbox, NULL, &req);

#else

        gtk_widget_size_request(s->vbox, &req);

#endif

        gtk_window_resize(GTK_WINDOW(s->window),

                          req.width * sx, req.height * sy);

    }

}

static void gd_update_full_redraw(GtkDisplayState *s)

{

    int ww, wh;

    gdk_drawable_get_size(gtk_widget_get_window(s->drawing_area), &ww, &wh);

    gtk_widget_queue_draw_area(s->drawing_area, 0, 0, ww, wh);

}

static void gtk_release_modifiers(GtkDisplayState *s)

{

    int i, keycode;

    if (!gd_on_vga(s)) {

        return;

    }

    for (i = 0; i < ARRAY_SIZE(modifier_keycode); i++) {

        keycode = modifier_keycode[i];

        if (!s->modifier_pressed[i]) {

            continue;

        }

        if (keycode & SCANCODE_GREY) {

            kbd_put_keycode(SCANCODE_EMUL0);

        }

        kbd_put_keycode(keycode | SCANCODE_UP);

        s->modifier_pressed[i] = false;

    }

}

/** DisplayState Callbacks **/

static void gd_update(DisplayChangeListener *dcl,

                      int x, int y, int w, int h)

{

    GtkDisplayState *s = container_of(dcl, GtkDisplayState, dcl);

    int x1, x2, y1, y2;

    int mx, my;

    int fbw, fbh;

    int ww, wh;

    DPRINTF("update(x=%d, y=%d, w=%d, h=%d)\n", x, y, w, h);

    x1 = floor(x * s->scale_x);

    y1 = floor(y * s->scale_y);

    x2 = ceil(x * s->scale_x + w * s->scale_x);

    y2 = ceil(y * s->scale_y + h * s->scale_y);

    fbw = surface_width(s->ds) * s->scale_x;

    fbh = surface_height(s->ds) * s->scale_y;

    gdk_drawable_get_size(gtk_widget_get_window(s->drawing_area), &ww, &wh);

    mx = my = 0;

    if (ww > fbw) {

        mx = (ww - fbw) / 2;

    }

    if (wh > fbh) {

        my = (wh - fbh) / 2;

    }

    gtk_widget_queue_draw_area(s->drawing_area, mx + x1, my + y1, (x2 - x1), (y2 - y1));

}

static void gd_refresh(DisplayChangeListener *dcl)

{

    vga_hw_update();

}

static void gd_switch(DisplayChangeListener *dcl,

                      DisplaySurface *surface)

{

    GtkDisplayState *s = container_of(dcl, GtkDisplayState, dcl);

    cairo_format_t kind;

    bool resized = true;

    int stride;

    DPRINTF("resize(width=%d, height=%d)\n",

            surface_width(surface), surface_height(surface));

    if (s->surface) {

        cairo_surface_destroy(s->surface);

    }

    if (s->ds &&

        surface_width(s->ds) == surface_width(surface) &&

        surface_height(s->ds) == surface_height(surface)) {

        resized = false;

    }

    s->ds = surface;

    switch (surface_bits_per_pixel(surface)) {

    case 8:

        kind = CAIRO_FORMAT_A8;

        break;

    case 16:

        kind = CAIRO_FORMAT_RGB16_565;

        break;

    case 32:

        kind = CAIRO_FORMAT_RGB24;

        break;

    default:

        g_assert_not_reached();

        break;

    }

    stride = cairo_format_stride_for_width(kind, surface_width(surface));

    g_assert(surface_stride(surface) == stride);

    s->surface = cairo_image_surface_create_for_data(surface_data(surface),

                                                     kind,

                                                     surface_width(surface),

                                                     surface_height(surface),

                                                     surface_stride(surface));

    if (resized) {

        gd_update_windowsize(s);

    } else {

        gd_update_full_redraw(s);

    }

}

/** QEMU Events **/

static void gd_change_runstate(void *opaque, int running, RunState state)

{

    GtkDisplayState *s = opaque;

    gd_update_caption(s);

}

static void gd_mouse_mode_change(Notifier *notify, void *data)

{

    gd_update_cursor(container_of(notify, GtkDisplayState, mouse_mode_notifier),

                     FALSE);

}

/** GTK Events **/

static gboolean gd_window_key_event(GtkWidget *widget, GdkEventKey *key, void *opaque)

{

    GtkDisplayState *s = opaque;

    GtkAccelGroupEntry *entries;

    guint n_entries = 0;

    gboolean propagate_accel = TRUE;

    gboolean handled = FALSE;

    entries = gtk_accel_group_query(s->accel_group, key->keyval,

                                    key->state, &n_entries);

    if (n_entries) {

        const char *quark = g_quark_to_string(entries[0].accel_path_quark);

        if (gd_is_grab_active(s) && strstart(quark, "<QEMU>/File/", NULL)) {

            propagate_accel = FALSE;

        }

    }

    if (!handled && propagate_accel) {

        handled = gtk_window_activate_key(GTK_WINDOW(widget), key);

    }

    if (handled) {

        gtk_release_modifiers(s);

    } else {

        handled = gtk_window_propagate_key_event(GTK_WINDOW(widget), key);

    }

    return handled;

}

static gboolean gd_window_close(GtkWidget *widget, GdkEvent *event,

                                void *opaque)

{

    GtkDisplayState *s = opaque;

    if (!no_quit) {

        unregister_displaychangelistener(&s->dcl);

        qmp_quit(NULL);

        return FALSE;

    }

    return TRUE;

}

static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)

{

    GtkDisplayState *s = opaque;

    int mx, my;

    int ww, wh;

    int fbw, fbh;

    if (!gtk_widget_get_realized(widget)) {

        return FALSE;

    }

    fbw = surface_width(s->ds);

    fbh = surface_height(s->ds);

    gdk_drawable_get_size(gtk_widget_get_window(widget), &ww, &wh);

    if (s->full_screen) {

        s->scale_x = (double)ww / fbw;

        s->scale_y = (double)wh / fbh;

    } else if (s->free_scale) {

        double sx, sy;

        sx = (double)ww / fbw;

        sy = (double)wh / fbh;

        s->scale_x = s->scale_y = MIN(sx, sy);

    }

    fbw *= s->scale_x;

    fbh *= s->scale_y;

    mx = my = 0;

    if (ww > fbw) {

        mx = (ww - fbw) / 2;

    }

    if (wh > fbh) {

        my = (wh - fbh) / 2;

    }

    cairo_rectangle(cr, 0, 0, ww, wh);

    /* Optionally cut out the inner area where the pixmap

       will be drawn. This avoids 'flashing' since we're

       not double-buffering. Note we're using the undocumented

       behaviour of drawing the rectangle from right to left

       to cut out the whole */

    cairo_rectangle(cr, mx + fbw, my,

                    -1 * fbw, fbh);

    cairo_fill(cr);

    cairo_scale(cr, s->scale_x, s->scale_y);

    cairo_set_source_surface(cr, s->surface, mx / s->scale_x, my / s->scale_y);

    cairo_paint(cr);

    return TRUE;

}

#if !GTK_CHECK_VERSION(3, 0, 0)

static gboolean gd_expose_event(GtkWidget *widget, GdkEventExpose *expose,

                                void *opaque)

{

    cairo_t *cr;

    gboolean ret;

    cr = gdk_cairo_create(gtk_widget_get_window(widget));

    cairo_rectangle(cr,

                    expose->area.x,

                    expose->area.y,

                    expose->area.width,

                    expose->area.height);

    cairo_clip(cr);

    ret = gd_draw_event(widget, cr, opaque);

    cairo_destroy(cr);

    return ret;

}

#endif

static gboolean gd_motion_event(GtkWidget *widget, GdkEventMotion *motion,

                                void *opaque)

{

    GtkDisplayState *s = opaque;

    int dx, dy;

    int x, y;

    int mx, my;

    int fbh, fbw;

    int ww, wh;

    fbw = surface_width(s->ds) * s->scale_x;

    fbh = surface_height(s->ds) * s->scale_y;

    gdk_drawable_get_size(gtk_widget_get_window(s->drawing_area), &ww, &wh);

    mx = my = 0;

    if (ww > fbw) {

        mx = (ww - fbw) / 2;

    }

    if (wh > fbh) {

        my = (wh - fbh) / 2;

    }

    x = (motion->x - mx) / s->scale_x;

    y = (motion->y - my) / s->scale_y;

    if (x < 0 || y < 0 ||

        x >= surface_width(s->ds) ||

        y >= surface_height(s->ds)) {

        return TRUE;

    }

    if (kbd_mouse_is_absolute()) {

        dx = x * 0x7FFF / (surface_width(s->ds) - 1);

        dy = y * 0x7FFF / (surface_height(s->ds) - 1);

    } else if (s->last_x == -1 || s->last_y == -1) {

        dx = 0;

        dy = 0;

    } else {

        dx = x - s->last_x;

        dy = y - s->last_y;

    }

    s->last_x = x;

    s->last_y = y;

    if (kbd_mouse_is_absolute() || gd_is_grab_active(s)) {

        kbd_mouse_event(dx, dy, 0, s->button_mask);

    }

    if (!kbd_mouse_is_absolute() && gd_is_grab_active(s)) {

        GdkScreen *screen = gtk_widget_get_screen(s->drawing_area);

        int x = (int)motion->x_root;

        int y = (int)motion->y_root;

        /* In relative mode check to see if client pointer hit

         * one of the screen edges, and if so move it back by

         * 200 pixels. This is important because the pointer

         * in the server doesn't correspond 1-for-1, and so

         * may still be only half way across the screen. Without

         * this warp, the server pointer would thus appear to hit

         * an invisible wall */

        if (x == 0) {

            x += 200;

        }

        if (y == 0) {

            y += 200;

        }

        if (x == (gdk_screen_get_width(screen) - 1)) {

            x -= 200;

        }

        if (y == (gdk_screen_get_height(screen) - 1)) {

            y -= 200;

        }

        if (x != (int)motion->x_root || y != (int)motion->y_root) {

#if GTK_CHECK_VERSION(3, 0, 0)

            GdkDevice *dev = gdk_event_get_device((GdkEvent *)motion);

            gdk_device_warp(dev, screen, x, y);

#else

            GdkDisplay *display = gtk_widget_get_display(widget);

            gdk_display_warp_pointer(display, screen, x, y);

#endif

            s->last_x = -1;

            s->last_y = -1;

            return FALSE;

        }

    }

    return TRUE;

}

static gboolean gd_button_event(GtkWidget *widget, GdkEventButton *button,

                                void *opaque)

{

    GtkDisplayState *s = opaque;

    int dx, dy;

    int n;

    if (button->button == 1) {

        n = 0x01;

    } else if (button->button == 2) {

        n = 0x04;

    } else if (button->button == 3) {

        n = 0x02;

    } else {

        n = 0x00;

    }

    if (button->type == GDK_BUTTON_PRESS) {

        s->button_mask |= n;

    } else if (button->type == GDK_BUTTON_RELEASE) {

        s->button_mask &= ~n;

    }

    if (kbd_mouse_is_absolute()) {

        dx = s->last_x * 0x7FFF / (surface_width(s->ds) - 1);

        dy = s->last_y * 0x7FFF / (surface_height(s->ds) - 1);

    } else {

        dx = 0;

        dy = 0;

    }

    kbd_mouse_event(dx, dy, 0, s->button_mask);

    return TRUE;

}

static gboolean gd_key_event(GtkWidget *widget, GdkEventKey *key, void *opaque)

{

    GtkDisplayState *s = opaque;

    int gdk_keycode;

    int qemu_keycode;

    int i;

    gdk_keycode = key->hardware_keycode;

    if (gdk_keycode < 9) {

        qemu_keycode = 0;

    } else if (gdk_keycode < 97) {

        qemu_keycode = gdk_keycode - 8;

    } else if (gdk_keycode < 158) {

        qemu_keycode = translate_evdev_keycode(gdk_keycode - 97);

    } else if (gdk_keycode == 208) { /* Hiragana_Katakana */

        qemu_keycode = 0x70;

    } else if (gdk_keycode == 211) { /* backslash */

        qemu_keycode = 0x73;

    } else {

        qemu_keycode = 0;

    }

    DPRINTF("translated GDK keycode %d to QEMU keycode %d (%s)\n",

            gdk_keycode, qemu_keycode,

            (key->type == GDK_KEY_PRESS) ? "down" : "up");

    for (i = 0; i < ARRAY_SIZE(modifier_keycode); i++) {

        if (qemu_keycode == modifier_keycode[i]) {

            s->modifier_pressed[i] = (key->type == GDK_KEY_PRESS);

        }

    }

    if (qemu_keycode & SCANCODE_GREY) {

        kbd_put_keycode(SCANCODE_EMUL0);

    }

    if (key->type == GDK_KEY_PRESS) {

        kbd_put_keycode(qemu_keycode & SCANCODE_KEYCODEMASK);

    } else if (key->type == GDK_KEY_RELEASE) {

        kbd_put_keycode(qemu_keycode | SCANCODE_UP);

    } else {

        g_assert_not_reached();

    }

    return TRUE;

}

/** Window Menu Actions **/

static void gd_menu_pause(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    if (s->external_pause_update) {

        return;

    }

    if (runstate_is_running()) {

        qmp_stop(NULL);

    } else {

        qmp_cont(NULL);

    }

}

static void gd_menu_reset(GtkMenuItem *item, void *opaque)

{

    qmp_system_reset(NULL);

}

static void gd_menu_powerdown(GtkMenuItem *item, void *opaque)

{

    qmp_system_powerdown(NULL);

}

static void gd_menu_quit(GtkMenuItem *item, void *opaque)

{

    qmp_quit(NULL);

}

static void gd_menu_switch_vc(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->vga_item))) {

        gtk_notebook_set_current_page(GTK_NOTEBOOK(s->notebook), 0);

    } else {

        int i;

        gtk_release_modifiers(s);

        for (i = 0; i < s->nb_vcs; i++) {

            if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->vc[i].menu_item))) {

                gtk_notebook_set_current_page(GTK_NOTEBOOK(s->notebook), i + 1);

                break;

            }

        }

    }

}

static void gd_menu_show_tabs(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->show_tabs_item))) {

        gtk_notebook_set_show_tabs(GTK_NOTEBOOK(s->notebook), TRUE);

    } else {

        gtk_notebook_set_show_tabs(GTK_NOTEBOOK(s->notebook), FALSE);

    }

}

static void gd_menu_full_screen(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    if (!s->full_screen) {

        gtk_notebook_set_show_tabs(GTK_NOTEBOOK(s->notebook), FALSE);

        gtk_widget_set_size_request(s->menu_bar, 0, 0);

        gtk_widget_set_size_request(s->drawing_area, -1, -1);

        gtk_window_fullscreen(GTK_WINDOW(s->window));

        if (gd_on_vga(s)) {

            gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->grab_item), TRUE);

        }

        s->full_screen = TRUE;

    } else {

        gtk_window_unfullscreen(GTK_WINDOW(s->window));

        gd_menu_show_tabs(GTK_MENU_ITEM(s->show_tabs_item), s);

        gtk_widget_set_size_request(s->menu_bar, -1, -1);

        gtk_widget_set_size_request(s->drawing_area,

                                    surface_width(s->ds),

                                    surface_height(s->ds));

        gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->grab_item), FALSE);

        s->full_screen = FALSE;

        s->scale_x = 1.0;

        s->scale_y = 1.0;

    }

    gd_update_cursor(s, FALSE);

}

static void gd_menu_zoom_in(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->zoom_fit_item),

                                   FALSE);

    s->scale_x += .25;

    s->scale_y += .25;

    gd_update_windowsize(s);

}

static void gd_menu_zoom_out(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(s->zoom_fit_item),

                                   FALSE);

    s->scale_x -= .25;

    s->scale_y -= .25;

    s->scale_x = MAX(s->scale_x, .25);

    s->scale_y = MAX(s->scale_y, .25);

    gd_update_windowsize(s);

}

static void gd_menu_zoom_fixed(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    s->scale_x = 1.0;

    s->scale_y = 1.0;

    gd_update_windowsize(s);

}

static void gd_menu_zoom_fit(GtkMenuItem *item, void *opaque)

{

    GtkDisplayState *s = opaque;

    if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(s->zoom_fit_item))) {

        s->free_scale = TRUE;

    } else {

        s->free_scale = FALSE;

    }

    gd_update_windowsize(s);

    gd_update_full_redraw(s);

}

static void gd_grab_keyboard(GtkDisplayState *s)

{

#if GTK_CHECK_VERSION(3, 0, 0)

    GdkDisplay *display = gtk_widget_get_display(s->drawing_area);

    GdkDeviceManager *mgr = gdk_display_get_device_manager(display);

    GList *devices = gdk_device_manager_list_devices(mgr,

                                                     GDK_DEVICE_TYPE_MASTER);

    GList *tmp = devices;

    while (tmp) {

        GdkDevice *dev = tmp->data;

        if (gdk_device_get_source(dev) == GDK_SOURCE_KEYBOARD) {

            gdk_device_grab(dev,

                            gtk_widget_get_window(s->drawing_area),

                            GDK_OWNERSHIP_NONE,

                            FALSE,

                            GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK,

                            NULL,

                            GDK_CURRENT_TIME);

        }

        tmp = tmp->next;

    }

    g_list_free(devices);

#else

    gdk_keyboard_grab(gtk_widget_get_window(s->drawing_area),

                      FALSE,

                      GDK_CURRENT_TIME);

#endif

}

static void gd_ungrab_keyboard(GtkDisplayState *s)

{

#if GTK_CHECK_VERSION(3, 0, 0)

    GdkDisplay *display = gtk_widget_get_display(s->drawing_area);

    GdkDeviceManager *mgr = gdk_display_get_device_manager(display);

    GList *devices = gdk_device_manager_list_devices(mgr,

                                                     GDK_DEVICE_TYPE_MASTER);

    GList *tmp = devices;

    while (tmp) {

        GdkDevice *dev = tmp->data;

        if (gdk_device_get_source(dev) == GDK_SOURCE_KEYBOARD) {

            gdk_device_ungrab(dev,

                              GDK_CURRENT_TIME);

        }

        tmp = tmp->next;

    }

    g_list_free(devices);

#else

    gdk_keyboard_ungrab(GDK_CURRENT_TIME);

#endif

}

static void gd_grab_pointer(GtkDisplayState *s)

{

#if GTK_CHECK_VERSION(3, 0, 0)

    GdkDisplay *display = gtk_widget_get_display(s->drawing_area);

    GdkDeviceManager *mgr = gdk_display_get_device_manager(display);

    GList *devices = gdk_device_manager_list_devices(mgr,

                                                     GDK_DEVICE_TYPE_MASTER);

    GList *tmp = devices;

    while (tmp) {

        GdkDevice *dev = tmp->data;

        if (gdk_device_get_source(dev) == GDK_SOURCE_MOUSE) {

            gdk_device_grab(dev,

                            gtk_widget_get_window(s->drawing_area),

                            GDK_OWNERSHIP_NONE,

                            FALSE, /* All events to come to our

                                      window directly */

                            GDK_POINTER_MOTION_MASK |

                            GDK_BUTTON_PRESS_MASK |

                            GDK_BUTTON_RELEASE_MASK |