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backend/x11: create per-window present event contexts

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The Present protocol states:

> An event context is associated with a specific window; using an existing
> event context with a different window generates a Match error.

Instead of a global event context, use a per-window event context to fix
this error:

    [backend/x11/backend.c:608] X11 error: op Present (SelectInput), code Match (no extension), sequence 63, value 4194307

Closes: https://github.com/swaywm/wlroots/issues/2577
This commit is contained in:
Simon Ser 2020-12-28 12:27:27 +01:00
parent 23b6f3e3f5
commit caeed70f28
3 changed files with 5 additions and 4 deletions
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2
backend/x11/backend.c
View file

@ -564,8 +564,6 @@ struct wlr_backend *wlr_x11_backend_create(struct wl_display *display,
}
#endif
x11->present_event_id = xcb_generate_id(x11->xcb);
wlr_input_device_init(&x11->keyboard_dev, WLR_INPUT_DEVICE_KEYBOARD,
&input_device_impl, "X11 keyboard", 0, 0);
wlr_keyboard_init(&x11->keyboard, &keyboard_impl);

5
backend/x11/output.c
View file

@ -86,6 +86,8 @@ static void output_destroy(struct wlr_output *wlr_output) {
wl_list_remove(&output->link);
wlr_buffer_unlock(output->back_buffer);
wlr_swapchain_destroy(output->swapchain);
// A zero event mask deletes the event context
xcb_present_select_input(x11->xcb, output->present_event_id, output->win, 0);
xcb_destroy_window(x11->xcb, output->win);
xcb_flush(x11->xcb);
free(output);
@ -398,7 +400,8 @@ struct wlr_output *wlr_x11_output_create(struct wlr_backend *backend) {
uint32_t present_mask = XCB_PRESENT_EVENT_MASK_IDLE_NOTIFY |
XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY;
xcb_present_select_input(x11->xcb, x11->present_event_id, output->win,
output->present_event_id = xcb_generate_id(x11->xcb);
xcb_present_select_input(x11->xcb, output->present_event_id, output->win,
present_mask);
xcb_change_property(x11->xcb, XCB_PROP_MODE_REPLACE, output->win,

2
include/backend/x11.h
View file

@ -34,6 +34,7 @@ struct wlr_x11_output {
struct wl_list link; // wlr_x11_backend::outputs
xcb_window_t win;
xcb_present_event_t present_event_id;
struct wlr_swapchain *swapchain;
struct wlr_buffer *back_buffer;
@ -68,7 +69,6 @@ struct wlr_x11_backend {
xcb_depth_t *depth;
xcb_visualid_t visualid;
xcb_colormap_t colormap;
xcb_present_event_t present_event_id;
size_t requested_outputs;
size_t last_output_num;