Archipelago » qemu

/*

 * QEMU SDL display driver

 *

 * Copyright (c) 2003 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

/* Avoid compiler warning because macro is redefined in SDL_syswm.h. */

#undef WIN32_LEAN_AND_MEAN

#include <SDL.h>

#include <SDL_syswm.h>

#ifndef _WIN32

#include <signal.h>

#endif

#include "qemu-common.h"

#include "console.h"

#include "sysemu.h"

#include "x_keymap.h"

#include "sdl_zoom.h"

static DisplayChangeListener *dcl;

static SDL_Surface *real_screen;

static SDL_Surface *guest_screen = NULL;

static int gui_grab; /* if true, all keyboard/mouse events are grabbed */

static int last_vm_running;

static int gui_saved_grab;

static int gui_fullscreen;

static int gui_noframe;

static int gui_key_modifier_pressed;

static int gui_keysym;

static int gui_fullscreen_initial_grab;

static int gui_grab_code = KMOD_LALT | KMOD_LCTRL;

static uint8_t modifiers_state[256];

static int width, height;

static SDL_Cursor *sdl_cursor_normal;

static SDL_Cursor *sdl_cursor_hidden;

static int absolute_enabled = 0;

static int guest_cursor = 0;

static int guest_x, guest_y;

static SDL_Cursor *guest_sprite = NULL;

static uint8_t allocator;

static SDL_PixelFormat host_format;

static int scaling_active = 0;

static Notifier mouse_mode_notifier;

static void sdl_update(DisplayState *ds, int x, int y, int w, int h)

{

    //    printf("updating x=%d y=%d w=%d h=%d\n", x, y, w, h);

    SDL_Rect rec;

    rec.x = x;

    rec.y = y;

    rec.w = w;

    rec.h = h;

    if (guest_screen) {

        if (!scaling_active) {

            SDL_BlitSurface(guest_screen, &rec, real_screen, &rec);

        } else {

            if (sdl_zoom_blit(guest_screen, real_screen, SMOOTHING_ON, &rec) < 0) {

                fprintf(stderr, "Zoom blit failed\n");

                exit(1);

            }

        }

    } 

    SDL_UpdateRect(real_screen, rec.x, rec.y, rec.w, rec.h);

}

static void sdl_setdata(DisplayState *ds)

{

    SDL_Rect rec;

    rec.x = 0;

    rec.y = 0;

    rec.w = real_screen->w;

    rec.h = real_screen->h;

    if (guest_screen != NULL) SDL_FreeSurface(guest_screen);

    guest_screen = SDL_CreateRGBSurfaceFrom(ds_get_data(ds), ds_get_width(ds), ds_get_height(ds),

                                            ds_get_bits_per_pixel(ds), ds_get_linesize(ds),

                                            ds->surface->pf.rmask, ds->surface->pf.gmask,

                                            ds->surface->pf.bmask, ds->surface->pf.amask);

}

static void do_sdl_resize(int new_width, int new_height, int bpp)

{

    int flags;

    //    printf("resizing to %d %d\n", w, h);

    flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL|SDL_RESIZABLE;

    if (gui_fullscreen)

        flags |= SDL_FULLSCREEN;

    if (gui_noframe)

        flags |= SDL_NOFRAME;

    width = new_width;

    height = new_height;

    real_screen = SDL_SetVideoMode(width, height, bpp, flags);

    if (!real_screen) {

        fprintf(stderr, "Could not open SDL display (%dx%dx%d): %s\n", width, 

                height, bpp, SDL_GetError());

        exit(1);

    }

}

static void sdl_resize(DisplayState *ds)

{

    if  (!allocator) {

        if (!scaling_active)

            do_sdl_resize(ds_get_width(ds), ds_get_height(ds), 0);

        else if (real_screen->format->BitsPerPixel != ds_get_bits_per_pixel(ds))

            do_sdl_resize(real_screen->w, real_screen->h, ds_get_bits_per_pixel(ds));

        sdl_setdata(ds);

    } else {

        if (guest_screen != NULL) {

            SDL_FreeSurface(guest_screen);

            guest_screen = NULL;

        }

    }

}

static PixelFormat sdl_to_qemu_pixelformat(SDL_PixelFormat *sdl_pf)

{

    PixelFormat qemu_pf;

    memset(&qemu_pf, 0x00, sizeof(PixelFormat));

    qemu_pf.bits_per_pixel = sdl_pf->BitsPerPixel;

    qemu_pf.bytes_per_pixel = sdl_pf->BytesPerPixel;

    qemu_pf.depth = (qemu_pf.bits_per_pixel) == 32 ? 24 : (qemu_pf.bits_per_pixel);

    qemu_pf.rmask = sdl_pf->Rmask;

    qemu_pf.gmask = sdl_pf->Gmask;

    qemu_pf.bmask = sdl_pf->Bmask;

    qemu_pf.amask = sdl_pf->Amask;

    qemu_pf.rshift = sdl_pf->Rshift;

    qemu_pf.gshift = sdl_pf->Gshift;

    qemu_pf.bshift = sdl_pf->Bshift;

    qemu_pf.ashift = sdl_pf->Ashift;

    qemu_pf.rbits = 8 - sdl_pf->Rloss;

    qemu_pf.gbits = 8 - sdl_pf->Gloss;

    qemu_pf.bbits = 8 - sdl_pf->Bloss;

    qemu_pf.abits = 8 - sdl_pf->Aloss;

    qemu_pf.rmax = ((1 << qemu_pf.rbits) - 1);

    qemu_pf.gmax = ((1 << qemu_pf.gbits) - 1);

    qemu_pf.bmax = ((1 << qemu_pf.bbits) - 1);

    qemu_pf.amax = ((1 << qemu_pf.abits) - 1);

    return qemu_pf;

}

static DisplaySurface* sdl_create_displaysurface(int width, int height)

{

    DisplaySurface *surface = (DisplaySurface*) qemu_mallocz(sizeof(DisplaySurface));

    if (surface == NULL) {

        fprintf(stderr, "sdl_create_displaysurface: malloc failed\n");

        exit(1);

    }

    surface->width = width;

    surface->height = height;

    if (scaling_active) {

        if (host_format.BytesPerPixel != 2 && host_format.BytesPerPixel != 4) {

            surface->linesize = width * 4;

            surface->pf = qemu_default_pixelformat(32);

        } else {

            surface->linesize = width * host_format.BytesPerPixel;

            surface->pf = sdl_to_qemu_pixelformat(&host_format);

        }

#ifdef HOST_WORDS_BIGENDIAN

        surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;

#else

        surface->flags = QEMU_ALLOCATED_FLAG;

#endif

        surface->data = (uint8_t*) qemu_mallocz(surface->linesize * surface->height);

        return surface;

    }

    if (host_format.BitsPerPixel == 16)

        do_sdl_resize(width, height, 16);

    else

        do_sdl_resize(width, height, 32);

    surface->pf = sdl_to_qemu_pixelformat(real_screen->format);

    surface->linesize = real_screen->pitch;

    surface->data = real_screen->pixels;

#ifdef HOST_WORDS_BIGENDIAN

    surface->flags = QEMU_REALPIXELS_FLAG | QEMU_BIG_ENDIAN_FLAG;

#else

    surface->flags = QEMU_REALPIXELS_FLAG;

#endif

    allocator = 1;

    return surface;

}

static void sdl_free_displaysurface(DisplaySurface *surface)

{

    allocator = 0;

    if (surface == NULL)

        return;

    if (surface->flags & QEMU_ALLOCATED_FLAG)

        qemu_free(surface->data);

    qemu_free(surface);

}

static DisplaySurface* sdl_resize_displaysurface(DisplaySurface *surface, int width, int height)

{

    sdl_free_displaysurface(surface);

    return sdl_create_displaysurface(width, height);

}

/* generic keyboard conversion */

#include "sdl_keysym.h"

static kbd_layout_t *kbd_layout = NULL;

static uint8_t sdl_keyevent_to_keycode_generic(const SDL_KeyboardEvent *ev)

{

    int keysym;

    /* workaround for X11+SDL bug with AltGR */

    keysym = ev->keysym.sym;

    if (keysym == 0 && ev->keysym.scancode == 113)

        keysym = SDLK_MODE;

    /* For Japanese key '\' and '|' */

    if (keysym == 92 && ev->keysym.scancode == 133) {

        keysym = 0xa5;

    }

    return keysym2scancode(kbd_layout, keysym) & SCANCODE_KEYMASK;

}

/* specific keyboard conversions from scan codes */

#if defined(_WIN32)

static uint8_t sdl_keyevent_to_keycode(const SDL_KeyboardEvent *ev)

{

    return ev->keysym.scancode;

}

#else

#if defined(SDL_VIDEO_DRIVER_X11)

#include <X11/XKBlib.h>

static int check_for_evdev(void)

{

    SDL_SysWMinfo info;

    XkbDescPtr desc = NULL;

    int has_evdev = 0;

    char *keycodes = NULL;

    SDL_VERSION(&info.version);

    if (!SDL_GetWMInfo(&info)) {

        return 0;

    }

    desc = XkbGetKeyboard(info.info.x11.display,

                          XkbGBN_AllComponentsMask,

                          XkbUseCoreKbd);

    if (desc && desc->names) {

        keycodes = XGetAtomName(info.info.x11.display, desc->names->keycodes);

        if (keycodes == NULL) {

            fprintf(stderr, "could not lookup keycode name\n");

        } else if (strstart(keycodes, "evdev", NULL)) {

            has_evdev = 1;

        } else if (!strstart(keycodes, "xfree86", NULL)) {

            fprintf(stderr, "unknown keycodes `%s', please report to "

                    "qemu-devel@nongnu.org\n", keycodes);

        }

    }

    if (desc) {

        XkbFreeKeyboard(desc, XkbGBN_AllComponentsMask, True);

    }

    if (keycodes) {

        XFree(keycodes);

    }

    return has_evdev;

}

#else

static int check_for_evdev(void)

{

        return 0;

}

#endif

static uint8_t sdl_keyevent_to_keycode(const SDL_KeyboardEvent *ev)

{

    int keycode;

    static int has_evdev = -1;

    if (has_evdev == -1)

        has_evdev = check_for_evdev();

    keycode = ev->keysym.scancode;

    if (keycode < 9) {

        keycode = 0;

    } else if (keycode < 97) {

        keycode -= 8; /* just an offset */

    } else if (keycode < 158) {

        /* use conversion table */

        if (has_evdev)

            keycode = translate_evdev_keycode(keycode - 97);

        else

            keycode = translate_xfree86_keycode(keycode - 97);

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

        keycode = 0x70;

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

        keycode = 0x73;

    } else {

        keycode = 0;

    }

    return keycode;

}

#endif

static void reset_keys(void)

{

    int i;

    for(i = 0; i < 256; i++) {

        if (modifiers_state[i]) {

            if (i & SCANCODE_GREY)

                kbd_put_keycode(SCANCODE_EMUL0);

            kbd_put_keycode(i | SCANCODE_UP);

            modifiers_state[i] = 0;

        }

    }

}

static void sdl_process_key(SDL_KeyboardEvent *ev)

{

    int keycode, v;

    if (ev->keysym.sym == SDLK_PAUSE) {

        /* specific case */

        v = 0;

        if (ev->type == SDL_KEYUP)

            v |= SCANCODE_UP;

        kbd_put_keycode(0xe1);

        kbd_put_keycode(0x1d | v);

        kbd_put_keycode(0x45 | v);

        return;

    }

    if (kbd_layout) {

        keycode = sdl_keyevent_to_keycode_generic(ev);

    } else {

        keycode = sdl_keyevent_to_keycode(ev);

    }

    switch(keycode) {

    case 0x00:

        /* sent when leaving window: reset the modifiers state */

        reset_keys();

        return;

    case 0x2a:                          /* Left Shift */

    case 0x36:                          /* Right Shift */

    case 0x1d:                          /* Left CTRL */

    case 0x9d:                          /* Right CTRL */

    case 0x38:                          /* Left ALT */

    case 0xb8:                         /* Right ALT */

        if (ev->type == SDL_KEYUP)

            modifiers_state[keycode] = 0;

        else

            modifiers_state[keycode] = 1;

        break;

    case 0x45: /* num lock */

    case 0x3a: /* caps lock */

        /* SDL does not send the key up event, so we generate it */

        kbd_put_keycode(keycode);

        kbd_put_keycode(keycode | SCANCODE_UP);

        return;

    }

    /* now send the key code */

    if (keycode & SCANCODE_GREY)

        kbd_put_keycode(SCANCODE_EMUL0);

    if (ev->type == SDL_KEYUP)

        kbd_put_keycode(keycode | SCANCODE_UP);

    else

        kbd_put_keycode(keycode & SCANCODE_KEYCODEMASK);

}

static void sdl_update_caption(void)

{

    char win_title[1024];

    char icon_title[1024];

    const char *status = "";

    if (!vm_running)

        status = " [Stopped]";

    else if (gui_grab) {

        if (alt_grab)

            status = " - Press Ctrl-Alt-Shift to exit mouse grab";

        else if (ctrl_grab)

            status = " - Press Right-Ctrl to exit mouse grab";

        else

            status = " - Press Ctrl-Alt to exit mouse grab";

    }

    if (qemu_name) {

        snprintf(win_title, sizeof(win_title), "QEMU (%s)%s", qemu_name, status);

        snprintf(icon_title, sizeof(icon_title), "QEMU (%s)", qemu_name);

    } else {

        snprintf(win_title, sizeof(win_title), "QEMU%s", status);

        snprintf(icon_title, sizeof(icon_title), "QEMU");

    }

    SDL_WM_SetCaption(win_title, icon_title);

}

static void sdl_hide_cursor(void)

{

    if (!cursor_hide)

        return;

    if (kbd_mouse_is_absolute()) {

        SDL_ShowCursor(1);

        SDL_SetCursor(sdl_cursor_hidden);

    } else {

        SDL_ShowCursor(0);

    }

}

static void sdl_show_cursor(void)

{

    if (!cursor_hide)

        return;

    if (!kbd_mouse_is_absolute()) {

        SDL_ShowCursor(1);

        if (guest_cursor &&

                (gui_grab || kbd_mouse_is_absolute() || absolute_enabled))

            SDL_SetCursor(guest_sprite);

        else

            SDL_SetCursor(sdl_cursor_normal);

    }

}

static void sdl_grab_start(void)

{

    if (guest_cursor) {

        SDL_SetCursor(guest_sprite);

        if (!kbd_mouse_is_absolute() && !absolute_enabled)

            SDL_WarpMouse(guest_x, guest_y);

    } else

        sdl_hide_cursor();

    if (SDL_WM_GrabInput(SDL_GRAB_ON) == SDL_GRAB_ON) {

        gui_grab = 1;

        sdl_update_caption();

    } else

        sdl_show_cursor();

}

static void sdl_grab_end(void)

{

    SDL_WM_GrabInput(SDL_GRAB_OFF);

    gui_grab = 0;

    sdl_show_cursor();

    sdl_update_caption();

}

static void sdl_mouse_mode_change(Notifier *notify)

{

    if (kbd_mouse_is_absolute()) {

        if (!absolute_enabled) {

            sdl_hide_cursor();

            if (gui_grab) {

                sdl_grab_end();

            }

            absolute_enabled = 1;

        }

    } else if (absolute_enabled) {

        sdl_show_cursor();

        absolute_enabled = 0;

    }

}

static void sdl_send_mouse_event(int dx, int dy, int dz, int x, int y, int state)

{

    int buttons;

    buttons = 0;

    if (state & SDL_BUTTON(SDL_BUTTON_LEFT))

        buttons |= MOUSE_EVENT_LBUTTON;

    if (state & SDL_BUTTON(SDL_BUTTON_RIGHT))

        buttons |= MOUSE_EVENT_RBUTTON;

    if (state & SDL_BUTTON(SDL_BUTTON_MIDDLE))

        buttons |= MOUSE_EVENT_MBUTTON;

    if (kbd_mouse_is_absolute()) {

       dx = x * 0x7FFF / (width - 1);

       dy = y * 0x7FFF / (height - 1);

    } else if (guest_cursor) {

        x -= guest_x;

        y -= guest_y;

        guest_x += x;

        guest_y += y;

        dx = x;

        dy = y;

    }

    kbd_mouse_event(dx, dy, dz, buttons);

}

static void toggle_full_screen(DisplayState *ds)

{

    gui_fullscreen = !gui_fullscreen;

    do_sdl_resize(real_screen->w, real_screen->h, real_screen->format->BitsPerPixel);

    if (gui_fullscreen) {

        scaling_active = 0;

        gui_saved_grab = gui_grab;

        sdl_grab_start();

    } else {

        if (!gui_saved_grab)

            sdl_grab_end();

    }

    vga_hw_invalidate();

    vga_hw_update();

}

static void sdl_refresh(DisplayState *ds)

{

    SDL_Event ev1, *ev = &ev1;

    int mod_state;

    int buttonstate = SDL_GetMouseState(NULL, NULL);

    if (last_vm_running != vm_running) {

        last_vm_running = vm_running;

        sdl_update_caption();

    }

    vga_hw_update();

    SDL_EnableUNICODE(!is_graphic_console());

    while (SDL_PollEvent(ev)) {

        switch (ev->type) {

        case SDL_VIDEOEXPOSE:

            sdl_update(ds, 0, 0, real_screen->w, real_screen->h);

            break;

        case SDL_KEYDOWN:

        case SDL_KEYUP:

            if (ev->type == SDL_KEYDOWN) {

                if (alt_grab) {

                    mod_state = (SDL_GetModState() & (gui_grab_code | KMOD_LSHIFT)) ==

                                (gui_grab_code | KMOD_LSHIFT);

                } else if (ctrl_grab) {

                    mod_state = (SDL_GetModState() & KMOD_RCTRL) == KMOD_RCTRL;

                } else {

                    mod_state = (SDL_GetModState() & gui_grab_code) ==

                                gui_grab_code;

                }

                gui_key_modifier_pressed = mod_state;

                if (gui_key_modifier_pressed) {

                    int keycode;

                    keycode = sdl_keyevent_to_keycode(&ev->key);

                    switch(keycode) {

                    case 0x21: /* 'f' key on US keyboard */

                        toggle_full_screen(ds);

                        gui_keysym = 1;

                        break;

                    case 0x16: /* 'u' key on US keyboard */

                        scaling_active = 0;

                        sdl_resize(ds);

                        vga_hw_invalidate();

                        vga_hw_update();

                        break;

                    case 0x02 ... 0x0a: /* '1' to '9' keys */

                        /* Reset the modifiers sent to the current console */

                        reset_keys();

                        console_select(keycode - 0x02);

                        if (!is_graphic_console()) {

                            /* display grab if going to a text console */

                            if (gui_grab)

                                sdl_grab_end();

                        }

                        gui_keysym = 1;

                        break;

                    default:

                        break;

                    }

                } else if (!is_graphic_console()) {

                    int keysym;

                    keysym = 0;

                    if (ev->key.keysym.mod & (KMOD_LCTRL | KMOD_RCTRL)) {

                        switch(ev->key.keysym.sym) {

                        case SDLK_UP: keysym = QEMU_KEY_CTRL_UP; break;

                        case SDLK_DOWN: keysym = QEMU_KEY_CTRL_DOWN; break;

                        case SDLK_LEFT: keysym = QEMU_KEY_CTRL_LEFT; break;

                        case SDLK_RIGHT: keysym = QEMU_KEY_CTRL_RIGHT; break;

                        case SDLK_HOME: keysym = QEMU_KEY_CTRL_HOME; break;

                        case SDLK_END: keysym = QEMU_KEY_CTRL_END; break;

                        case SDLK_PAGEUP: keysym = QEMU_KEY_CTRL_PAGEUP; break;

                        case SDLK_PAGEDOWN: keysym = QEMU_KEY_CTRL_PAGEDOWN; break;

                        default: break;

                        }

                    } else {

                        switch(ev->key.keysym.sym) {

                        case SDLK_UP: keysym = QEMU_KEY_UP; break;

                        case SDLK_DOWN: keysym = QEMU_KEY_DOWN; break;

                        case SDLK_LEFT: keysym = QEMU_KEY_LEFT; break;

                        case SDLK_RIGHT: keysym = QEMU_KEY_RIGHT; break;

                        case SDLK_HOME: keysym = QEMU_KEY_HOME; break;

                        case SDLK_END: keysym = QEMU_KEY_END; break;

                        case SDLK_PAGEUP: keysym = QEMU_KEY_PAGEUP; break;

                        case SDLK_PAGEDOWN: keysym = QEMU_KEY_PAGEDOWN; break;

                        case SDLK_BACKSPACE: keysym = QEMU_KEY_BACKSPACE; break;

                        case SDLK_DELETE: keysym = QEMU_KEY_DELETE; break;

                        default: break;

                        }

                    }

                    if (keysym) {

                        kbd_put_keysym(keysym);

                    } else if (ev->key.keysym.unicode != 0) {

                        kbd_put_keysym(ev->key.keysym.unicode);

                    }

                }

            } else if (ev->type == SDL_KEYUP) {

                if (!alt_grab) {

                    mod_state = (ev->key.keysym.mod & gui_grab_code);

                } else {

                    mod_state = (ev->key.keysym.mod &

                                 (gui_grab_code | KMOD_LSHIFT));

                }

                if (!mod_state) {

                    if (gui_key_modifier_pressed) {

                        gui_key_modifier_pressed = 0;

                        if (gui_keysym == 0) {

                            /* exit/enter grab if pressing Ctrl-Alt */

                            if (!gui_grab) {

                                /* if the application is not active,

                                   do not try to enter grab state. It

                                   prevents

                                   'SDL_WM_GrabInput(SDL_GRAB_ON)'

                                   from blocking all the application

                                   (SDL bug). */

                                if (SDL_GetAppState() & SDL_APPACTIVE)

                                    sdl_grab_start();

                            } else {

                                sdl_grab_end();

                            }

                            /* SDL does not send back all the

                               modifiers key, so we must correct it */

                            reset_keys();

                            break;

                        }

                        gui_keysym = 0;

                    }

                }

            }

            if (is_graphic_console() && !gui_keysym)

                sdl_process_key(&ev->key);

            break;

        case SDL_QUIT:

            if (!no_quit)

                qemu_system_shutdown_request();

            break;

        case SDL_MOUSEMOTION:

            if (gui_grab || kbd_mouse_is_absolute() ||

                absolute_enabled) {

                sdl_send_mouse_event(ev->motion.xrel, ev->motion.yrel, 0,

                       ev->motion.x, ev->motion.y, ev->motion.state);

            }

            break;

        case SDL_MOUSEBUTTONDOWN:

        case SDL_MOUSEBUTTONUP:

            {

                SDL_MouseButtonEvent *bev = &ev->button;

                if (!gui_grab && !kbd_mouse_is_absolute()) {

                    if (ev->type == SDL_MOUSEBUTTONDOWN &&

                        (bev->button == SDL_BUTTON_LEFT)) {

                        /* start grabbing all events */

                        sdl_grab_start();

                    }

                } else {

                    int dz;

                    dz = 0;

                    if (ev->type == SDL_MOUSEBUTTONDOWN) {

                        buttonstate |= SDL_BUTTON(bev->button);

                    } else {

                        buttonstate &= ~SDL_BUTTON(bev->button);

                    }

#ifdef SDL_BUTTON_WHEELUP

                    if (bev->button == SDL_BUTTON_WHEELUP && ev->type == SDL_MOUSEBUTTONDOWN) {

                        dz = -1;

                    } else if (bev->button == SDL_BUTTON_WHEELDOWN && ev->type == SDL_MOUSEBUTTONDOWN) {

                        dz = 1;

                    }

#endif

                    sdl_send_mouse_event(0, 0, dz, bev->x, bev->y, buttonstate);

                }

            }

            break;

        case SDL_ACTIVEEVENT:

            if (gui_grab && ev->active.state == SDL_APPINPUTFOCUS &&

                !ev->active.gain && !gui_fullscreen_initial_grab) {

                sdl_grab_end();

            }

            if (ev->active.state & SDL_APPACTIVE) {

                if (ev->active.gain) {

                    /* Back to default interval */

                    dcl->gui_timer_interval = 0;

                    dcl->idle = 0;

                } else {

                    /* Sleeping interval */

                    dcl->gui_timer_interval = 500;

                    dcl->idle = 1;

                }

            }

            break;

        case SDL_VIDEORESIZE:

        {

            SDL_ResizeEvent *rev = &ev->resize;

            int bpp = real_screen->format->BitsPerPixel;

            if (bpp != 16 && bpp != 32)

                bpp = 32;

            do_sdl_resize(rev->w, rev->h, bpp);

            scaling_active = 1;

            if (!is_buffer_shared(ds->surface)) {

                ds->surface = qemu_resize_displaysurface(ds, ds_get_width(ds), ds_get_height(ds));

                dpy_resize(ds);

            }

            vga_hw_invalidate();

            vga_hw_update();

            break;

        }

        default:

            break;

        }

    }

}

static void sdl_fill(DisplayState *ds, int x, int y, int w, int h, uint32_t c)

{

    SDL_Rect dst = { x, y, w, h };

    SDL_FillRect(real_screen, &dst, c);

}

static void sdl_mouse_warp(int x, int y, int on)

{

    if (on) {

        if (!guest_cursor)

            sdl_show_cursor();

        if (gui_grab || kbd_mouse_is_absolute() || absolute_enabled) {

            SDL_SetCursor(guest_sprite);

            if (!kbd_mouse_is_absolute() && !absolute_enabled)

                SDL_WarpMouse(x, y);

        }

    } else if (gui_grab)

        sdl_hide_cursor();

    guest_cursor = on;

    guest_x = x, guest_y = y;

}

static void sdl_mouse_define(QEMUCursor *c)

{

    uint8_t *image, *mask;

    int bpl;

    if (guest_sprite)

        SDL_FreeCursor(guest_sprite);

    bpl = cursor_get_mono_bpl(c);

    image = qemu_mallocz(bpl * c->height);

    mask  = qemu_mallocz(bpl * c->height);

    cursor_get_mono_image(c, 0x000000, image);

    cursor_get_mono_mask(c, 0, mask);

    guest_sprite = SDL_CreateCursor(image, mask, c->width, c->height,

                                    c->hot_x, c->hot_y);

    qemu_free(image);

    qemu_free(mask);

    if (guest_cursor &&

            (gui_grab || kbd_mouse_is_absolute() || absolute_enabled))

        SDL_SetCursor(guest_sprite);

}

static void sdl_cleanup(void)

{

    if (guest_sprite)

        SDL_FreeCursor(guest_sprite);

    SDL_QuitSubSystem(SDL_INIT_VIDEO);

}

void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)

{

    int flags;

    uint8_t data = 0;

    DisplayAllocator *da;

    const SDL_VideoInfo *vi;

#if defined(__APPLE__)

    /* always use generic keymaps */

    if (!keyboard_layout)

        keyboard_layout = "en-us";

#endif

    if(keyboard_layout) {

        kbd_layout = init_keyboard_layout(name2keysym, keyboard_layout);

        if (!kbd_layout)

            exit(1);

    }

    if (no_frame)

        gui_noframe = 1;

    if (!full_screen) {

        setenv("SDL_VIDEO_ALLOW_SCREENSAVER", "1", 0);

    }

    flags = SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE;

    if (SDL_Init (flags)) {

        fprintf(stderr, "Could not initialize SDL(%s) - exiting\n",

                SDL_GetError());

        exit(1);

    }

    vi = SDL_GetVideoInfo();

    host_format = *(vi->vfmt);

    dcl = qemu_mallocz(sizeof(DisplayChangeListener));

    dcl->dpy_update = sdl_update;

    dcl->dpy_resize = sdl_resize;

    dcl->dpy_refresh = sdl_refresh;

    dcl->dpy_setdata = sdl_setdata;

    dcl->dpy_fill = sdl_fill;

    ds->mouse_set = sdl_mouse_warp;

    ds->cursor_define = sdl_mouse_define;

    register_displaychangelistener(ds, dcl);

    da = qemu_mallocz(sizeof(DisplayAllocator));

    da->create_displaysurface = sdl_create_displaysurface;

    da->resize_displaysurface = sdl_resize_displaysurface;

    da->free_displaysurface = sdl_free_displaysurface;

    if (register_displayallocator(ds, da) == da) {

        dpy_resize(ds);

    }

    mouse_mode_notifier.notify = sdl_mouse_mode_change;

    qemu_add_mouse_mode_change_notifier(&mouse_mode_notifier);

    sdl_update_caption();

    SDL_EnableKeyRepeat(250, 50);

    gui_grab = 0;

    sdl_cursor_hidden = SDL_CreateCursor(&data, &data, 8, 1, 0, 0);

    sdl_cursor_normal = SDL_GetCursor();

    atexit(sdl_cleanup);

    if (full_screen) {

        gui_fullscreen = 1;

        gui_fullscreen_initial_grab = 1;

        sdl_grab_start();

    }

}