refine the pointer motion function, this is now closer to what other

compositors do

src/Cursor.zig

@@ -32,10 +32,11 @@ mode: enum { normal, drag } = .normal,
 drag: ?struct {
     event_code: u32,
     start: struct { x: c_int, y: c_int },
-    view: ?struct { view: *View, dims: struct { width: c_int, height: c_int }, offset: struct {
+    view: ?struct {
-        x: c_int,
+        view: *View,
-        y: c_int,
+        dims: struct { width: c_int, height: c_int },
-    } },
+        offset: struct { x: c_int, y: c_int },
+    },
 },
 
 pub fn init(self: *Cursor) void {
@@ -73,8 +74,21 @@ pub fn deinit(self: *Cursor) void {
     self.x_cursor_manager.destroy();
 }
 
-pub fn processCursorMotion(self: *Cursor, time_msec: u32) void {
+pub fn processCursorMotion(
-    var passthrough = true;
+    self: *Cursor,
+    time_msec: u32,
+    device: *wlr.InputDevice,
+    delta_x: f64,
+    delta_y: f64,
+    unaccel_dx: f64,
+    unaccel_dy: f64,
+) void {
+    // these will be used later when the relative pointer manager is setup
+    _ = unaccel_dx;
+    _ = unaccel_dy;
+
+    // process the cursor motion
+    self.wlr_cursor.move(device, delta_x, delta_y);
 
     if (self.mode == .drag) {
         const modifiers = server.seat.keyboard_group.wlr_group.keyboard.getModifiers();
@@ -84,12 +98,25 @@ pub fn processCursorMotion(self: *Cursor, time_msec: u32) void {
         // Proceed if mousemap for current mouse and modifier state's exist
         if (server.mousemaps.get(Mousemap.hash(modifiers, @bitCast(self.drag.?.event_code)))) |map| {
             if (map.options.lua_drag_ref_idx > 0) {
-                passthrough = map.callback(.drag, .{ .{ .x = @as(c_int, @intFromFloat(self.wlr_cursor.x)), .y = @as(c_int, @intFromFloat(self.wlr_cursor.y)) }, .{ .start = self.drag.?.start, .view = if (self.drag.?.view != null) .{ .id = self.drag.?.view.?.view.id, .dims = self.drag.?.view.?.dims, .offset = self.drag.?.view.?.offset } else null } });
+                const passthrough = map.callback(.drag, .{
+                    .{
+                        .x = @as(c_int, @intFromFloat(self.wlr_cursor.x)),
+                        .y = @as(c_int, @intFromFloat(self.wlr_cursor.y)),
+                    },
+                    .{
+                        .start = self.drag.?.start,
+                        .view = if (self.drag.?.view != null) .{
+                            .id = self.drag.?.view.?.view.id,
+                            .dims = self.drag.?.view.?.dims,
+                            .offset = self.drag.?.view.?.offset,
+                        } else null,
+                    }
+                });
+                if (!passthrough) return;
             }
         }
     }
 
-    if (passthrough) {
     const output = server.seat.focused_output;
     // Exit the switch if no focused output exists
     std.debug.assert(output != null);
@@ -97,34 +124,67 @@ pub fn processCursorMotion(self: *Cursor, time_msec: u32) void {
     const surfaceAtResult = output.?.surfaceAt(self.wlr_cursor.x, self.wlr_cursor.y);
     if (surfaceAtResult) |surface| {
         if (surface.scene_node_data.* == .view) {
-                server.events.exec("ViewPointerMotion", .{ surface.scene_node_data.view.id, @as(c_int, @intFromFloat(self.wlr_cursor.x)), @as(c_int, @intFromFloat(self.wlr_cursor.y)) });
+            server.events.exec("ViewPointerMotion", .{
+                surface.scene_node_data.view.id,
+                @as(c_int, @intFromFloat(self.wlr_cursor.x)),
+                @as(c_int, @intFromFloat(self.wlr_cursor.y)),
+            });
         }
 
         server.seat.wlr_seat.pointerNotifyEnter(surfaceAtResult.?.surface, surfaceAtResult.?.sx, surfaceAtResult.?.sy);
         server.seat.wlr_seat.pointerNotifyMotion(time_msec, surfaceAtResult.?.sx, surfaceAtResult.?.sy);
     } else {
-            // This may not be necessary, remove if no bugs
         server.seat.wlr_seat.pointerClearFocus();
         self.wlr_cursor.setXcursor(self.x_cursor_manager, "default");
     }
 }
-}
 
 // --------- WLR Cursor event handlers ---------
 fn handleMotion(
     _: *wl.Listener(*wlr.Pointer.event.Motion),
     event: *wlr.Pointer.event.Motion,
 ) void {
-    server.cursor.wlr_cursor.move(event.device, event.delta_x, event.delta_y);
+    server.cursor.processCursorMotion(
-    server.cursor.processCursorMotion(event.time_msec);
+        event.time_msec,
+        event.device,
+        event.delta_x,
+        event.delta_y,
+        event.unaccel_dx,
+        event.unaccel_dy,
+    );
 }
 
 fn handleMotionAbsolute(
-    _: *wl.Listener(*wlr.Pointer.event.MotionAbsolute),
+    listener: *wl.Listener(*wlr.Pointer.event.MotionAbsolute),
     event: *wlr.Pointer.event.MotionAbsolute,
 ) void {
-    server.cursor.wlr_cursor.warpAbsolute(event.device, event.x, event.y);
+    const self: *Cursor = @fieldParentPtr("motion_absolute", listener);
-    server.cursor.processCursorMotion(event.time_msec);
+    // comment from dwl:
+    // This event is forwarded by the cursor when a pointer emits an _absolute_
+    // motion event, from 0..1 on each axis. This happens, for example, when
+    // wlroots is running under a Wayland window rather than KMS+DRM, and you
+    // move the mouse over the window. You could enter the window from any edge,
+    // so we have to warp the mouse there. Also, some hardware emits these events.
+
+    // move the cursor when it doesn't order its events
+    if (event.time_msec == 0) {
+        self.wlr_cursor.warpAbsolute(event.device, event.x, event.y);
+    }
+
+    var layout_x: f64 = 0;
+    var layout_y: f64 = 0;
+    self.wlr_cursor.absoluteToLayoutCoords(event.device, event.x, event.y, &layout_x, &layout_y);
+
+    const delta_x = layout_x - self.wlr_cursor.x;
+    const delta_y = layout_y - self.wlr_cursor.y;
+    server.cursor.processCursorMotion(
+        event.time_msec,
+        event.device,
+        delta_x,
+        delta_y,
+        delta_x, // absolute motions do not decelerate
+        delta_y,
+    );
 }
 
 fn handleButton(listener: *wl.Listener(*wlr.Pointer.event.Button), event: *wlr.Pointer.event.Button) void {
@@ -134,15 +194,28 @@ fn handleButton(listener: *wl.Listener(*wlr.Pointer.event.Button), event: *wlr.P
         .pressed => {
             cursor.mode = .drag;
 
-            cursor.drag = .{ .event_code = event.button, .start = .{ .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)), .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)) }, .view = null };
+            cursor.drag = .{
+                .event_code = event.button,
+                .start = .{
+                    .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)),
+                    .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)),
+                },
+                .view = null,
+            };
 
             // Keep track of where the drag started
             if (server.seat.focused_surface) |fs| {
                 if (fs == .view) {
                     cursor.drag.?.view = .{
                         .view = fs.view,
-                        .dims = .{ .width = fs.view.xdg_toplevel.base.geometry.width, .height = fs.view.xdg_toplevel.base.geometry.height },
+                        .dims = .{
-                        .offset = .{ .x = cursor.drag.?.start.x - fs.view.scene_tree.node.x, .y = cursor.drag.?.start.y - fs.view.scene_tree.node.y },
+                            .width = fs.view.xdg_toplevel.base.geometry.width,
+                            .height = fs.view.xdg_toplevel.base.geometry.height,
+                        },
+                        .offset = .{
+                            .x = cursor.drag.?.start.x - fs.view.scene_tree.node.x,
+                            .y = cursor.drag.?.start.y - fs.view.scene_tree.node.y,
+                        },
                     };
                 }
             }
@@ -172,14 +245,20 @@ fn handleButton(listener: *wl.Listener(*wlr.Pointer.event.Button), event: *wlr.P
                 // Only make callback if a callback function exists
                 if (map.options.lua_press_ref_idx > 0) {
                     passthrough = map.callback(.press, .{
-                        .{ .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)), .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)) },
+                        .{
+                            .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)),
+                            .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)),
+                        },
                     });
                 }
             },
             .released => {
                 if (map.options.lua_press_ref_idx > 0) {
                     passthrough = map.callback(.release, .{
-                        .{ .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)), .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)) },
+                        .{
+                            .x = @as(c_int, @intFromFloat(cursor.wlr_cursor.x)),
+                            .y = @as(c_int, @intFromFloat(cursor.wlr_cursor.y)),
+                        },
                     });
                 }
             },