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qemu/sdl.c
aliguori 6bb816031f Handle SDL grabs failing (Mark McLoughlin) 
If a X window is not viewable, XGrabPointer() fails and
returns GrabNotViewable. SDL's X backend currently handles
this by retrying the grab until the window becomes viewable
again.

This means e.g. if you Ctrl-Alt-RightArrow to switch
workspaces, QEMU tries to grab, SDL blocks because the
window isn't viewable and your guest stops executing until
you switch back to that workspace again.

See this Fedora bug for the gory details:

  https://bugzilla.redhat.com/480065

Some SDL backends will return SDL_GRAB_OFF from
SDL_WM_GrabInput(), so the fix is to make the X backend do
this if the grab fails.

The only side-effect in QEMU is that if SDL_WM_GrabInput()
fails we still change the window title to indicate that it's
grabbed, when in fact it's not. This patch fixes that minor
issue.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6325 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-15 20:47:45 +00:00

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/*
* 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.
*/
#include "qemu-common.h"
#include "console.h"
#include "sysemu.h"
#include <SDL.h>
#ifndef _WIN32
#include <signal.h>
#endif
static SDL_Surface *screen;
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 = 0;
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_UpdateRect(screen, x, y, w, h);
}
static void sdl_resize(DisplayState *ds, int w, int h)
{
int flags;
// printf("resizing to %d %d\n", w, h);
flags = SDL_HWSURFACE|SDL_ASYNCBLIT|SDL_HWACCEL;
if (gui_fullscreen)
flags |= SDL_FULLSCREEN;
if (gui_noframe)
flags |= SDL_NOFRAME;
width = w;
height = h;
again:
screen = SDL_SetVideoMode(w, h, 0, flags);
if (!screen) {
fprintf(stderr, "Could not open SDL display\n");
exit(1);
}
if (!screen->pixels && (flags & SDL_HWSURFACE) && (flags & SDL_FULLSCREEN)) {
flags &= ~SDL_HWSURFACE;
goto again;
}
if (!screen->pixels) {
fprintf(stderr, "Could not open SDL display\n");
exit(1);
}
ds->data = screen->pixels;
ds->linesize = screen->pitch;
ds->depth = screen->format->BitsPerPixel;
/* SDL BitsPerPixel never indicates any values other than
multiples of 8, so we need to check for strange depths. */
if (ds->depth == 16) {
uint32_t mask;
mask = screen->format->Rmask;
mask |= screen->format->Gmask;
mask |= screen->format->Bmask;
if ((mask & 0x8000) == 0)
ds->depth = 15;
}
if (ds->depth == 32 && screen->format->Rshift == 0) {
ds->bgr = 1;
} else {
ds->bgr = 0;
}
ds->width = w;
ds->height = h;
}
/* generic keyboard conversion */
#include "sdl_keysym.h"
#include "keymaps.c"
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);
}
/* 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
static uint8_t sdl_keyevent_to_keycode(const SDL_KeyboardEvent *ev)
{
int keycode;
keycode = ev->keysym.scancode;
if (keycode < 9) {
keycode = 0;
} else if (keycode < 97) {
keycode -= 8; /* just an offset */
} else if (keycode < 212) {
/* use conversion table */
keycode = _translate_keycode(keycode - 97);
} 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 & 0x80)
kbd_put_keycode(0xe0);
kbd_put_keycode(i | 0x80);
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 |= 0x80;
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 | 0x80);
return;
}
/* now send the key code */
if (keycode & 0x80)
kbd_put_keycode(0xe0);
if (ev->type == SDL_KEYUP)
kbd_put_keycode(keycode | 0x80);
else
kbd_put_keycode(keycode & 0x7f);
}
static void sdl_update_caption(void)
{
char buf[1024];
const char *status = "";
if (!vm_running)
status = " [Stopped]";
else if (gui_grab) {
if (!alt_grab)
status = " - Press Ctrl-Alt to exit grab";
else
status = " - Press Ctrl-Alt-Shift to exit grab";
}
if (qemu_name)
snprintf(buf, sizeof(buf), "QEMU (%s)%s", qemu_name, status);
else
snprintf(buf, sizeof(buf), "QEMU%s", status);
SDL_WM_SetCaption(buf, "QEMU");
}
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);
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_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()) {
if (!absolute_enabled) {
sdl_hide_cursor();
if (gui_grab) {
sdl_grab_end();
}
absolute_enabled = 1;
}
dx = x * 0x7FFF / (width - 1);
dy = y * 0x7FFF / (height - 1);
} else if (absolute_enabled) {
sdl_show_cursor();
absolute_enabled = 0;
} 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;
sdl_resize(ds, screen->w, screen->h);
if (gui_fullscreen) {
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, screen->w, screen->h);
break;
case SDL_KEYDOWN:
case SDL_KEYUP:
if (ev->type == SDL_KEYDOWN) {
if (!alt_grab) {
mod_state = (SDL_GetModState() & gui_grab_code) ==
gui_grab_code;
} else {
mod_state = (SDL_GetModState() & (gui_grab_code | KMOD_LSHIFT)) ==
(gui_grab_code | KMOD_LSHIFT);
}
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 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 */
ds->gui_timer_interval = 0;
ds->idle = 0;
} else {
/* Sleeping interval */
ds->gui_timer_interval = 500;
ds->idle = 1;
}
}
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(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);
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(int width, int height, int bpp,
int hot_x, int hot_y,
uint8_t *image, uint8_t *mask)
{
uint8_t sprite[256], *line;
int x, y, dst, bypl, src = 0;
if (guest_sprite)
SDL_FreeCursor(guest_sprite);
memset(sprite, 0, 256);
bypl = ((width * bpp + 31) >> 5) << 2;
for (y = 0, dst = 0; y < height; y ++, image += bypl) {
line = image;
for (x = 0; x < width; x ++, dst ++) {
switch (bpp) {
case 24:
src = *(line ++); src |= *(line ++); src |= *(line ++);
break;
case 16:
case 15:
src = *(line ++); src |= *(line ++);
break;
case 8:
src = *(line ++);
break;
case 4:
src = 0xf & (line[x >> 1] >> ((x & 1)) << 2);
break;
case 2:
src = 3 & (line[x >> 2] >> ((x & 3)) << 1);
break;
case 1:
src = 1 & (line[x >> 3] >> (x & 7));
break;
}
if (!src)
sprite[dst >> 3] |= (1 << (~dst & 7)) & mask[dst >> 3];
}
}
guest_sprite = SDL_CreateCursor(sprite, mask, width, height, hot_x, hot_y);
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_Quit();
}
void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
{
int flags;
uint8_t data = 0;
#if defined(__APPLE__)
/* always use generic keymaps */
if (!keyboard_layout)
keyboard_layout = "en-us";
#endif
if(keyboard_layout) {
kbd_layout = init_keyboard_layout(keyboard_layout);
if (!kbd_layout)
exit(1);
}
if (no_frame)
gui_noframe = 1;
flags = SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE;
if (SDL_Init (flags)) {
fprintf(stderr, "Could not initialize SDL - exiting\n");
exit(1);
}
ds->dpy_update = sdl_update;
ds->dpy_resize = sdl_resize;
ds->dpy_refresh = sdl_refresh;
ds->dpy_fill = sdl_fill;
ds->mouse_set = sdl_mouse_warp;
ds->cursor_define = sdl_mouse_define;
sdl_resize(ds, 640, 400);
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();
}
}
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