Implement initial Xwayland support

1 files changed, 151 insertions, 0 deletions

diff --git a/src/XwaylandView.zig b/src/XwaylandView.zig
new file mode 100644
index 0000000..56beec8
--- /dev/null
+++ b/src/XwaylandView.zig
@@ -0,0 +1,151 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2020 Isaac Freund
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+const Self = @This();
+
+const std = @import("std");
+
+const c = @import("c.zig");
+
+const Box = @import("Box.zig");
+const Log = @import("log.zig").Log;
+const View = @import("View.zig");
+const ViewStack = @import("view_stack.zig").ViewStack;
+const XdgPopup = @import("XdgPopup.zig");
+
+/// The view this xwayland view implements
+view: *View,
+
+/// The corresponding wlroots object
+wlr_xwayland_surface: *c.wlr_xwayland_surface,
+
+// Listeners that are always active over the view's lifetime
+listen_destroy: c.wl_listener,
+listen_map: c.wl_listener,
+listen_unmap: c.wl_listener,
+
+// Listeners that are only active while the view is mapped
+listen_commit: c.wl_listener,
+
+pub fn init(self: *Self, view: *View, wlr_xwayland_surface: *c.wlr_xwayland_surface) void {
+    self.view = view;
+    self.wlr_xwayland_surface = wlr_xwayland_surface;
+    wlr_xwayland_surface.data = self;
+
+    // Add listeners that are active over the view's entire lifetime
+    self.listen_destroy.notify = handleDestroy;
+    c.wl_signal_add(&self.wlr_xwayland_surface.events.destroy, &self.listen_destroy);
+
+    self.listen_map.notify = handleMap;
+    c.wl_signal_add(&self.wlr_xwayland_surface.events.map, &self.listen_map);
+
+    self.listen_unmap.notify = handleUnmap;
+    c.wl_signal_add(&self.wlr_xwayland_surface.events.unmap, &self.listen_unmap);
+}
+
+/// TODO: real output layout coords
+pub fn configure(self: Self, pending_box: Box) void {
+    c.wlr_xwayland_surface_configure(
+        self.wlr_xwayland_surface,
+        0,
+        0,
+        @intCast(u16, pending_box.width),
+        @intCast(u16, pending_box.height),
+    );
+}
+
+/// Inform the xwayland surface that it has gained focus
+pub fn setActivated(self: Self, activated: bool) void {
+    c.wlr_xwayland_surface_activate(self.wlr_xwayland_surface, activated);
+}
+
+/// Close the view. This will lead to the unmap and destroy events being sent
+pub fn close(self: Self) void {
+    c.wlr_xwayland_surface_close(self.wlr_xwayland_surface);
+}
+
+/// Iterate over all surfaces of the xwayland view.
+pub fn forEachSurface(
+    self: Self,
+    iterator: c.wlr_surface_iterator_func_t,
+    user_data: ?*c_void,
+) void {
+    c.wlr_surface_for_each_surface(self.wlr_xwayland_surface.surface, iterator, user_data);
+}
+
+/// Return the surface at output coordinates ox, oy and set sx, sy to the
+/// corresponding surface-relative coordinates, if there is a surface.
+pub fn surfaceAt(self: Self, ox: f64, oy: f64, sx: *f64, sy: *f64) ?*c.wlr_surface {
+    return c.wlr_surface_surface_at(
+        self.wlr_xwayland_surface.surface,
+        ox - @intToFloat(f64, self.view.current_box.x),
+        oy - @intToFloat(f64, self.view.current_box.y),
+        sx,
+        sy,
+    );
+}
+
+/// Called when the xwayland surface is destroyed
+fn handleDestroy(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_destroy", listener.?);
+    const output = self.view.output;
+
+    // Remove listeners that are active for the entire lifetime of the view
+    c.wl_list_remove(&self.listen_destroy.link);
+    c.wl_list_remove(&self.listen_map.link);
+    c.wl_list_remove(&self.listen_unmap.link);
+
+    // Remove the view from the stack
+    const node = @fieldParentPtr(ViewStack(View).Node, "view", self.view);
+    output.views.remove(node);
+    output.root.server.allocator.destroy(node);
+}
+
+/// Called when the xwayland surface is mapped, or ready to display on-screen.
+fn handleMap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_map", listener.?);
+    const view = self.view;
+    const root = view.output.root;
+
+    // Add listeners that are only active while mapped
+    self.listen_commit.notify = handleCommit;
+    c.wl_signal_add(&self.wlr_xwayland_surface.surface.*.events.commit, &self.listen_commit);
+
+    view.wlr_surface = self.wlr_xwayland_surface.surface;
+    view.floating = false;
+
+    view.natural_width = self.wlr_xwayland_surface.width;
+    view.natural_height = self.wlr_xwayland_surface.height;
+
+    view.map();
+}
+
+/// Called when the surface is unmapped and will no longer be displayed.
+fn handleUnmap(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_unmap", listener.?);
+
+    self.view.unmap();
+
+    // Remove listeners that are only active while mapped
+    c.wl_list_remove(&self.listen_commit.link);
+}
+
+/// Called when the surface is comitted
+fn handleCommit(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_commit", listener.?);
+    // TODO: check for unexpected change in size and react as needed
+}