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ui: avoid sending framebuffer updates outside client desktop bounds

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We plan framebuffer update rects based on the VNC server surface. If the
client doesn't support desktop resize, then the client bounds may differ
from the server surface bounds. VNC clients may become upset if we then
send an update message outside the bounds of the client desktop.

This takes the approach of clamping the rectangles from the worker
thread immediately before sending them. This may sometimes results in
sending a framebuffer update message with zero rectangles.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210311182957.486939-3-berrange@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Daniel P. Berrangé
2021-03-11 18:29:55 +00:00
committed by Gerd Hoffmann
parent adc8fce871
commit 55b400497c
2 changed files with 45 additions and 4 deletions
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ui/trace-events
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@ -59,6 +59,11 @@ vnc_client_throttle_audio(void *state, void *ioc, size_t offset) "VNC client thr
vnc_client_unthrottle_forced(void *state, void *ioc) "VNC client unthrottle forced offset state=%p ioc=%p"
vnc_client_unthrottle_incremental(void *state, void *ioc, size_t offset) "VNC client unthrottle incremental state=%p ioc=%p offset=%zu"
vnc_client_output_limit(void *state, void *ioc, size_t offset, size_t threshold) "VNC client output limit state=%p ioc=%p offset=%zu threshold=%zu"
vnc_job_add_rect(void *state, void *job, int x, int y, int w, int h) "VNC add rect state=%p job=%p offset=%d,%d size=%dx%d"
vnc_job_discard_rect(void *state, void *job, int x, int y, int w, int h) "VNC job discard rect state=%p job=%p offset=%d,%d size=%dx%d"
vnc_job_clamp_rect(void *state, void *job, int x, int y, int w, int h) "VNC job clamp rect state=%p job=%p offset=%d,%d size=%dx%d"
vnc_job_clamped_rect(void *state, void *job, int x, int y, int w, int h) "VNC job clamp rect state=%p job=%p offset=%d,%d size=%dx%d"
vnc_job_nrects(void *state, void *job, int nrects) "VNC job state=%p job=%p nrects=%d"
vnc_auth_init(void *display, int websock, int auth, int subauth) "VNC auth init state=%p websock=%d auth=%d subauth=%d"
vnc_auth_start(void *state, int method) "VNC client auth start state=%p method=%d"
vnc_auth_pass(void *state, int method) "VNC client auth passed state=%p method=%d"