xdg-output: don't send no-op updates
To begin with, no-op updates are unnecessary, so this patch is an improvement on its own. Then, this fixes hotplugging issues with xwayland. xwayland waits for both wl_output and xdg_output to send a "done" event. However, it doesn't handle well desynchronized "done" updates: if xdg-output sends "done" twice, the second one will wait for the next wl_output "done" event. This is an issue when the first is a no-op and the second is a real update: the second isn't applied. I've considered patching xwayland instead, but it seems pretty complicated.
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@ -10,6 +10,9 @@ struct wlr_xdg_output {
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struct wlr_output_layout_output *layout_output;
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int32_t x, y;
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int32_t width, height;
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struct wl_listener destroy;
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};
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@ -22,15 +22,14 @@ static void output_handle_resource_destroy(struct wl_resource *resource) {
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wl_list_remove(wl_resource_get_link(resource));
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}
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static void output_send_details(struct wl_resource *resource,
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struct wlr_output_layout_output *layout_output) {
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struct wlr_output *output = layout_output->output;
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zxdg_output_v1_send_logical_position(resource,
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layout_output->x, layout_output->y);
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static void output_send_details(struct wlr_xdg_output *xdg_output,
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struct wl_resource *resource) {
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struct wlr_output *output = xdg_output->layout_output->output;
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int width, height;
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wlr_output_effective_resolution(layout_output->output, &width, &height);
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zxdg_output_v1_send_logical_size(resource, width, height);
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zxdg_output_v1_send_logical_position(resource,
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xdg_output->x, xdg_output->y);
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zxdg_output_v1_send_logical_size(resource,
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xdg_output->width, xdg_output->height);
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uint32_t version = wl_resource_get_version(resource);
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if (version >= ZXDG_OUTPUT_V1_NAME_SINCE_VERSION) {
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@ -46,6 +45,32 @@ static void output_send_details(struct wl_resource *resource,
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zxdg_output_v1_send_done(resource);
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}
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static void output_update(struct wlr_xdg_output *xdg_output) {
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struct wlr_output_layout_output *layout_output = xdg_output->layout_output;
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bool updated = false;
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if (layout_output->x != xdg_output->x || layout_output->y != xdg_output->y) {
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xdg_output->x = layout_output->x;
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xdg_output->y = layout_output->y;
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updated = true;
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}
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int width, height;
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wlr_output_effective_resolution(layout_output->output, &width, &height);
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if (xdg_output->width != width || xdg_output->height != height) {
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xdg_output->width = width;
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xdg_output->height = height;
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updated = true;
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}
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if (updated) {
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struct wl_resource *resource;
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wl_resource_for_each(resource, &xdg_output->resources) {
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output_send_details(xdg_output, resource);
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}
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}
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}
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static void output_destroy(struct wlr_xdg_output *output) {
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struct wl_resource *resource, *tmp;
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wl_resource_for_each_safe(resource, tmp, &output->resources) {
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@ -70,7 +95,7 @@ static void output_manager_handle_get_xdg_output(struct wl_client *client,
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struct wl_resource *resource, uint32_t id,
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struct wl_resource *output_resource) {
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assert(wl_resource_instance_of(resource, &zxdg_output_manager_v1_interface,
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&output_manager_implementation));
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&output_manager_implementation));
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struct wlr_xdg_output_manager *manager =
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wl_resource_get_user_data(resource);
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@ -97,10 +122,12 @@ static void output_manager_handle_get_xdg_output(struct wl_client *client,
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return;
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}
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wl_resource_set_implementation(xdg_output_resource, &output_implementation,
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NULL, output_handle_resource_destroy);
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output_send_details(xdg_output_resource, layout_output);
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NULL, output_handle_resource_destroy);
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wl_list_insert(&xdg_output->resources,
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wl_resource_get_link(xdg_output_resource));
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wl_resource_get_link(xdg_output_resource));
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output_send_details(xdg_output, xdg_output_resource);
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}
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static const struct zxdg_output_manager_v1_interface
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@ -125,7 +152,7 @@ static void output_manager_bind(struct wl_client *wl_client, void *data,
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return;
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}
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wl_resource_set_implementation(resource, &output_manager_implementation,
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manager, output_manager_handle_resource_destroy);
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manager, output_manager_handle_resource_destroy);
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wl_list_insert(&manager->resources, wl_resource_get_link(resource));
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}
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@ -146,16 +173,14 @@ static void add_output(struct wlr_xdg_output_manager *manager,
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output->destroy.notify = handle_output_destroy;
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wl_signal_add(&layout_output->events.destroy, &output->destroy);
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wl_list_insert(&manager->outputs, &output->link);
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output_update(output);
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}
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static void output_manager_send_details(
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struct wlr_xdg_output_manager *manager) {
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struct wlr_xdg_output *output;
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wl_list_for_each(output, &manager->outputs, link) {
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struct wl_resource *resource;
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wl_resource_for_each(resource, &output->resources) {
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output_send_details(resource, output->layout_output);
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}
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output_update(output);
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}
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}
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