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Juraj Marcin 0310d594d9 ui/vnc: Update display update interval when VM state changes to RUNNING 
If a virtual machine is paused for an extended period time, for example,
due to an incoming migration, there are also no changes on the screen.
VNC in such case increases the display update interval by
VNC_REFRESH_INTERVAL_INC (50 ms). The update interval can then grow up
to VNC_REFRESH_INTERVAL_MAX (3000 ms).

When the machine resumes, it can then take up to 3 seconds for the first
display update. Furthermore, the update interval is then halved with
each display update with changes on the screen. If there are moving
elements on the screen, such as a video, this can be perceived as
freezing and stuttering for few seconds before the movement is smooth
again.

This patch resolves this issue, by adding a listener to VM state changes
and changing the update interval when the VM state changes to RUNNING.
The update_displaychangelistener() function updates the internal timer,
and the display is refreshed immediately if the timer is expired.

Signed-off-by: Juraj Marcin <jmarcin@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Link: https://lore.kernel.org/r/20250521151616.3951178-1-jmarcin@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
2025-06-23 16:03:59 -04:00
..
icons configure: move directory options from config-host.mak to meson 2020-10-26 07:08:38 -04:00
shader meson: do not build shaders by default 2023-10-17 15:20:53 +02:00
clipboard.c ui/clipboard: delay clipboard update when not running 2025-05-24 16:33:18 +02:00
cocoa.m ui & main loop: Redesign of system-specific main thread event handling 2024-12-31 21:21:34 +01:00
console-gl.c ui/console: remove redundant format field 2023-09-12 10:37:02 +04:00
console-priv.h ui/curses: Do not use console_select() 2024-03-20 10:27:58 +04:00
console-vc-stubs.c ui/curses: Do not use console_select() 2024-03-20 10:27:58 +04:00
console-vc.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
console.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
curses.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
curses_keys.h For curses display, recognize a few more control keys 2023-07-25 10:56:51 +01:00
cursor.c ui/cursor: remove cursor_get_mono_image 2024-10-03 17:26:06 +03:00
cursor_hidden.xpm ui: move files to ui/ and include/ui/ 2012-12-19 08:31:30 +01:00
cursor_left_ptr.xpm ui: move files to ui/ and include/ui/ 2012-12-19 08:31:30 +01:00
dbus-chardev.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
dbus-clipboard.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
dbus-console.c ui/dbus: on win32, allow ANONYMOUS with p2p 2025-02-03 21:15:57 +04:00
dbus-display1.xml ui/dbus: change dbus ScanoutDMABUF interface 2025-05-06 13:39:47 +04:00
dbus-error.c ui: add a D-Bus display backend 2021-12-21 10:50:22 +04:00
dbus-listener.c ui/dbus: change dbus ScanoutDMABUF interface 2025-05-06 13:39:47 +04:00
dbus-module.c ui/dbus: add p2p=on/off option 2021-12-21 10:50:22 +04:00
dbus.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
dbus.h ui/dbus: win32 support 2023-06-27 17:08:56 +02:00
dmabuf.c ui/dmabuf: extend QemuDmaBuf to support multi-plane 2025-05-06 11:57:03 +04:00
egl-context.c qapi/ui: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
egl-headless.c qapi/ui: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
egl-helpers.c ui/gtk-egl: Render guest content with padding in fixed-scale mode 2025-05-24 17:04:09 +02:00
gtk-clipboard.c ui/gtk: warn if setting the clipboard failed 2025-05-24 16:33:17 +02:00
gtk-egl.c ui/gtk-egl: Render guest content with padding in fixed-scale mode 2025-05-24 17:04:09 +02:00
gtk-gl-area.c ui/gtk-gl-area: Render guest content with padding in fixed-scale mode 2025-05-24 17:04:00 +02:00
gtk.c ui/gtk: Consider scaling when propagating ui info 2025-05-24 17:03:50 +02:00
input-barrier.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
input-barrier.h ui: add an embedded Barrier client 2019-09-17 13:43:22 +02:00
input-keymap.c meson: rename included C source files to .c.inc 2020-08-21 06:18:30 -04:00
input-legacy.c ui/input-legacy.c: remove unused legacy qemu_add_kbd_event_handler() function 2024-11-08 11:06:42 +01:00
input-linux.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
input.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
kbd-state.c ui/vnc: Do not use console_select() 2024-03-20 10:27:54 +04:00
keymaps.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
keymaps.h ui: spelling fixes 2023-08-31 19:47:43 +02:00
meson.build meson: remove unnecessary dependencies from specific_ss 2025-05-12 16:08:24 +02:00
qemu-pixman.c ui/vnc: take account of client byte order in pixman format 2025-05-21 19:28:01 +01:00
qemu-x509.h ui: move files to ui/ and include/ui/ 2012-12-19 08:31:30 +01:00
qemu.desktop ui: fix icon display for GTK frontend under GNOME Shell with Wayland 2019-01-21 09:43:13 +01:00
sdl2-2d.c ui+display: rename is_placeholder() -> surface_is_placeholder() 2024-06-19 12:42:03 +02:00
sdl2-gl.c ui/gtk-egl: Render guest content with padding in fixed-scale mode 2025-05-24 17:04:09 +02:00
sdl2-input.c ui/sdl2: release all modifiers 2024-09-13 20:12:16 +02:00
sdl2.c ui/sdl: Consider scaling in mouse event handling 2025-05-24 17:03:31 +02:00
shader.c ui/shader: free associated programs 2022-03-14 15:16:16 +04:00
spice-app.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
spice-core.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
spice-display.c ui/spice: support multi plane dmabuf scanout 2025-05-06 13:40:09 +04:00
spice-input.c input: Allow to choose console with qemu_input_is_absolute 2023-10-03 15:04:56 +04:00
spice-module.c spice: wire up monitor in QemuSpiceOps. 2020-10-21 15:46:14 +02:00
trace-events ui/dbus: add trace for can_share_map 2024-10-14 17:34:09 +04:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
udmabuf.c Do not include "qemu/error-report.h" in headers that do not need it 2023-02-14 09:11:27 +01:00
ui-hmp-cmds.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
ui-qmp-cmds.c ui/qmp-cmds: Improve two error messages 2023-11-17 10:07:52 +01:00
util.c include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
vdagent.c ui/vdagent: remove migration blocker 2025-05-24 16:33:18 +02:00
vgafont.h ui: fix tab indentation 2022-11-08 10:23:06 +01:00
vnc-auth-sasl.c ui: validate NUL byte padding in SASL client data more strictly 2024-10-22 13:02:31 +01:00
vnc-auth-sasl.h vnc: avoid deprecation warnings for SASL on OS X 2021-06-15 17:17:09 +02:00
vnc-auth-vencrypt.c vnc: fix resource leak when websocket channel error 2020-11-04 08:25:17 +01:00
vnc-auth-vencrypt.h Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
vnc-clipboard.c ui/vnc-clipboard: fix inflate_buffer 2023-12-04 11:28:26 +04:00
vnc-enc-hextile-template.h ui/vnc-enc-hextile: Use static rather than dynamic length stack array 2023-09-04 14:57:44 +04:00
vnc-enc-hextile.c Drop useless casts from g_malloc() & friends to pointer 2022-10-22 23:15:40 +02:00
vnc-enc-tight.c ui/vnc: fix tight palette pixel encoding for 8/16-bpp formats 2025-05-21 19:36:15 +01:00
vnc-enc-tight.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
vnc-enc-zlib.c vnc: fix memory leak when vnc disconnect 2019-09-17 13:45:10 +02:00
vnc-enc-zrle.c ui/vnc.c: replace big endian flag with byte order value 2025-05-21 19:28:01 +01:00
vnc-enc-zrle.c.inc ui: Clean up local variable shadowing 2023-09-29 08:13:57 +02:00
vnc-enc-zrle.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
vnc-enc-zywrle-template.c ui: fix tab indentation 2022-11-08 10:23:06 +01:00
vnc-enc-zywrle.h ui: spelling fixes 2023-08-31 19:47:43 +02:00
vnc-jobs.c ui/vnc.c: replace big endian flag with byte order value 2025-05-21 19:28:01 +01:00
vnc-jobs.h ui/vnc: Drop unused vnc_has_job() and vnc_jobs_clear() 2017-02-08 14:59:36 +01:00
vnc-palette.c ui: Clean up local variable shadowing 2023-09-29 08:13:57 +02:00
vnc-palette.h Include qapi/qmp/qlist.h exactly where needed 2018-02-09 13:52:15 +01:00
vnc-stubs.c qemu-options: define -vnc only #ifdef CONFIG_VNC 2023-11-07 14:04:25 +04:00
vnc-ws.c bulk: Remove pointless QOM casts 2023-06-05 20:48:34 +02:00
vnc-ws.h Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
vnc.c ui/vnc: Update display update interval when VM state changes to RUNNING 2025-06-23 16:03:59 -04:00
vnc.h ui/vnc: Update display update interval when VM state changes to RUNNING 2025-06-23 16:03:59 -04:00
vnc_keysym.h ui: fix tab indentation 2022-11-08 10:23:06 +01:00
win32-kbd-hook.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
x_keymap.c ui: Fix memory leak in qemu_xkeymap_mapping_table() 2021-05-02 17:24:50 +02:00
x_keymap.h ui: convert GTK and SDL1 frontends to keycodemapdb 2018-01-25 15:02:00 +01:00