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XdgToplevel: fix frame perfection on unmap

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It looks like the old workaround for this wlroots API wart is no longer
sufficient for wlroots 0.17.
This commit is contained in:
Isaac Freund 2024-01-03 12:39:43 -06:00
parent be4dbe3fe7
commit db70868c04
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GPG Key ID: 86DED400DDFD7A11
1 changed files with 13 additions and 13 deletions
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26
river/XdgToplevel.zig
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@ -79,10 +79,21 @@ pub fn create(xdg_toplevel: *wlr.XdgToplevel) error{OutOfMemory}!void {
} });
errdefer view.destroy();
_ = try view.surface_tree.createSceneXdgSurface(xdg_toplevel.base);
const self = &view.impl.xdg_toplevel;
// This listener must be added before the scene xdg surface is created.
// Otherwise, the scene surface nodes will already be disabled by the unmap
// listeners in the scene xdg surface and scene subsurface tree helpers
// before our unmap listener is called.
// However, we need the surface tree to be unchanged in our unmap listener
// so that we can save the buffers for frame perfection.
// TODO(wlroots) This is fragile, it would be good if wlroots gave us a
// better alternative here.
xdg_toplevel.base.surface.events.unmap.add(&self.unmap);
errdefer self.unmap.link.remove();
_ = try view.surface_tree.createSceneXdgSurface(xdg_toplevel.base);
self.view = view;
xdg_toplevel.base.data = @intFromPtr(self);
@ -91,7 +102,6 @@ pub fn create(xdg_toplevel: *wlr.XdgToplevel) error{OutOfMemory}!void {
// Add listeners that are active over the toplevel's entire lifetime
xdg_toplevel.base.events.destroy.add(&self.destroy);
xdg_toplevel.base.surface.events.map.add(&self.map);
xdg_toplevel.base.surface.events.unmap.add(&self.unmap);
xdg_toplevel.base.events.new_popup.add(&self.new_popup);
_ = xdg_toplevel.setWmCapabilities(.{ .fullscreen = true });
@ -253,17 +263,7 @@ fn handleUnmap(listener: *wl.Listener(void)) void {
self.set_title.link.remove();
self.set_app_id.link.remove();
// TODO(wlroots): This enable/disable dance is a workaround for an signal
// ordering issue with the scene xdg surface helper's unmap handler that
// disables the node. We however need the node enabled for View.unmap()
// so that we can save buffers for frame perfection.
var it = self.view.surface_tree.children.iterator(.forward);
const xdg_surface_tree_node = it.next().?;
xdg_surface_tree_node.setEnabled(true);
self.view.unmap();
xdg_surface_tree_node.setEnabled(false);
}
fn handleNewPopup(listener: *wl.Listener(*wlr.XdgPopup), wlr_xdg_popup: *wlr.XdgPopup) void {