From 5825ee31cce95572ba34049aebcd0ec81704637a Mon Sep 17 00:00:00 2001
From: nullableVoidPtr <30564701+nullableVoidPtr@users.noreply.github.com>
Date: Sun, 3 Dec 2023 17:23:51 +0800
Subject: [PATCH] chase(output): support fractional scaling

manually notify scaling at some surfaces like xdg popups and xwayland
---
 include/labwc.h |  1 +
 src/server.c    |  3 +++
 src/xdg.c       | 16 ++++++++++++++++
 src/xwayland.c  |  8 ++++++++
 4 files changed, 28 insertions(+)

diff --git a/include/labwc.h b/include/labwc.h
index f288de35..6537c6a5 100644
--- a/include/labwc.h
+++ b/include/labwc.h
@@ -17,6 +17,7 @@
 #include <wlr/types/wlr_cursor.h>
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_foreign_toplevel_management_v1.h>
+#include <wlr/types/wlr_fractional_scale_v1.h>
 #include <wlr/types/wlr_gamma_control_v1.h>
 #include <wlr/types/wlr_input_device.h>
 #include <wlr/types/wlr_keyboard.h>
diff --git a/src/server.c b/src/server.c
index bd21d775..ae9c69c9 100644
--- a/src/server.c
+++ b/src/server.c
@@ -31,6 +31,7 @@
 #include "xwayland.h"
 
 #define LAB_WLR_COMPOSITOR_VERSION (5)
+#define LAB_WLR_FRACTIONAL_SCALE_MANAGER_VERSION (1)
 
 static struct wlr_compositor *compositor;
 static struct wl_event_source *sighup_source;
@@ -377,6 +378,8 @@ server_init(struct server *server)
 	wlr_data_control_manager_v1_create(server->wl_display);
 	wlr_viewporter_create(server->wl_display);
 	wlr_single_pixel_buffer_manager_v1_create(server->wl_display);
+	wlr_fractional_scale_manager_v1_create(
+		server->wl_display, LAB_WLR_FRACTIONAL_SCALE_MANAGER_VERSION);
 
 	idle_manager_create(server->wl_display, server->seat.seat);
 
diff --git a/src/xdg.c b/src/xdg.c
index 713eccd1..5fb8dca0 100644
--- a/src/xdg.c
+++ b/src/xdg.c
@@ -125,6 +125,14 @@ handle_commit(struct wl_listener *listener, void *data)
 	}
 
 	if (update_required) {
+		wlr_fractional_scale_v1_notify_scale(
+			view->surface,
+			view->output->wlr_output->scale
+		);
+		wlr_surface_set_preferred_buffer_scale(
+			view->surface,
+			ceil(view->output->wlr_output->scale)
+		);
 		view_impl_apply_geometry(view, size.width, size.height);
 	}
 }
@@ -307,6 +315,14 @@ xdg_toplevel_view_configure(struct view *view, struct wlr_box geo)
 		 * glitches during resize, we apply the same position
 		 * adjustments here as in handle_commit().
 		 */
+		wlr_fractional_scale_v1_notify_scale(
+			view->surface,
+			view->output->wlr_output->scale
+		);
+		wlr_surface_set_preferred_buffer_scale(
+			view->surface,
+			ceil(view->output->wlr_output->scale)
+		);
 		view_impl_apply_geometry(view, view->current.width,
 			view->current.height);
 	}
diff --git a/src/xwayland.c b/src/xwayland.c
index 30277c06..403b3459 100644
--- a/src/xwayland.c
+++ b/src/xwayland.c
@@ -199,6 +199,14 @@ handle_commit(struct wl_listener *listener, void *data)
 	 * reducing visual glitches.
 	 */
 	if (current->width != state->width || current->height != state->height) {
+		wlr_fractional_scale_v1_notify_scale(
+			view->surface,
+			view->output->wlr_output->scale
+		);
+		wlr_surface_set_preferred_buffer_scale(
+			view->surface,
+			ceil(view->output->wlr_output->scale)
+		);
 		view_impl_apply_geometry(view, state->width, state->height);
 	}
 }