Apply output transformation to pointer events in Wayland backend

backend/drm/drm.c

@@ -558,39 +558,17 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 		}
 	}
 
-	switch (output->transform) {
-	case WL_OUTPUT_TRANSFORM_90:
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = -plane->surf.height + hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_180:
-		plane->cursor_hotspot_x = plane->surf.width - hotspot_x;
-		plane->cursor_hotspot_y = plane->surf.height - hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_270:
-		plane->cursor_hotspot_x = -plane->surf.height + hotspot_x;
-		plane->cursor_hotspot_y = hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED:
-		plane->cursor_hotspot_x = plane->surf.width - hotspot_x;
-		plane->cursor_hotspot_y = hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = -hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = plane->surf.height - hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
-		plane->cursor_hotspot_x = -plane->surf.height + hotspot_x;
-		plane->cursor_hotspot_y = plane->surf.width - hotspot_y;
-		break;
-	default: // WL_OUTPUT_TRANSFORM_NORMAL
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = hotspot_y;
-	}
+	struct wlr_box hotspot_box = {
+		.width = plane->surf.width,
+		.height = plane->surf.height,
+		.x = hotspot_x,
+		.y = hotspot_y,
+	};
+	struct wlr_box transformed_hotspot_box;
+	wlr_output_transform_apply_to_box(output->transform,
+		&hotspot_box, &transformed_hotspot_box);
+	plane->cursor_hotspot_x = transformed_hotspot_box.x;
+	plane->cursor_hotspot_y = transformed_hotspot_box.y;
 
 	if (!update_pixels) {
 		// Only update the cursor hotspot

backend/wayland/wl_seat.c

@@ -42,21 +42,30 @@ static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
 		uint32_t time, wl_fixed_t surface_x, wl_fixed_t surface_y) {
 	struct wlr_input_device *dev = data;
 	assert(dev && dev->pointer);
-	struct wlr_wl_pointer *wlr_wl_pointer = (struct wlr_wl_pointer *)dev->pointer;
+	struct wlr_wl_pointer *wlr_wl_pointer =
+		(struct wlr_wl_pointer *)dev->pointer;
 	if (!wlr_wl_pointer->current_output) {
 		wlr_log(L_ERROR, "pointer motion event without current output");
 		return;
 	}
-	int width, height;
+
+	struct wlr_box box;
 	wl_egl_window_get_attached_size(wlr_wl_pointer->current_output->egl_window,
-		&width, &height);
+		&box.width, &box.height);
+	box.x = wl_fixed_to_int(surface_x);
+	box.y = wl_fixed_to_int(surface_y);
+	struct wlr_box transformed;
+	wlr_output_transform_apply_to_box(
+		wlr_wl_pointer->current_output->wlr_output.transform, &box,
+		&transformed);
+
 	struct wlr_event_pointer_motion_absolute wlr_event;
 	wlr_event.device = dev;
 	wlr_event.time_msec = time;
-	wlr_event.width_mm = width;
-	wlr_event.height_mm = height;
-	wlr_event.x_mm = wl_fixed_to_double(surface_x);
-	wlr_event.y_mm = wl_fixed_to_double(surface_y);
+	wlr_event.width_mm = transformed.width;
+	wlr_event.height_mm = transformed.height;
+	wlr_event.x_mm = transformed.x;
+	wlr_event.y_mm = transformed.y;
 	wl_signal_emit(&dev->pointer->events.motion_absolute, &wlr_event);
 }
 

include/wlr/interfaces/wlr_output.h

@@ -2,6 +2,7 @@
 #define WLR_INTERFACES_WLR_OUTPUT_H
 
 #include <stdbool.h>
+#include <wlr/types/wlr_box.h>
 #include <wlr/types/wlr_output.h>
 #include <wlr/backend.h>
 
@@ -31,4 +32,7 @@ struct wl_global *wlr_output_create_global(struct wlr_output *wlr_output,
 	struct wl_display *display);
 void wlr_output_destroy_global(struct wlr_output *wlr_output);
 
+void wlr_output_transform_apply_to_box(enum wl_output_transform transform,
+	struct wlr_box *box, struct wlr_box *dest);
+
 #endif

types/wlr_output.c

@@ -500,3 +500,57 @@ void wlr_output_cursor_destroy(struct wlr_output_cursor *cursor) {
 	wl_list_remove(&cursor->link);
 	free(cursor);
 }
+
+void wlr_output_transform_apply_to_box(enum wl_output_transform transform,
+		struct wlr_box *box, struct wlr_box *dest) {
+	switch (transform) {
+	case WL_OUTPUT_TRANSFORM_NORMAL:
+	case WL_OUTPUT_TRANSFORM_180:
+	case WL_OUTPUT_TRANSFORM_FLIPPED:
+	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+		dest->width = box->width;
+		dest->height = box->height;
+		break;
+	case WL_OUTPUT_TRANSFORM_90:
+	case WL_OUTPUT_TRANSFORM_270:
+	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+		dest->width = box->height;
+		dest->height = box->width;
+		break;
+	}
+
+	switch (transform) {
+	case WL_OUTPUT_TRANSFORM_NORMAL:
+		dest->x = box->x;
+		dest->y = box->y;
+		break;
+	case WL_OUTPUT_TRANSFORM_90:
+		dest->x = box->y;
+		dest->y = box->width - box->x;
+		break;
+	case WL_OUTPUT_TRANSFORM_180:
+		dest->x = box->width - box->x;
+		dest->y = box->height - box->y;
+		break;
+	case WL_OUTPUT_TRANSFORM_270:
+		dest->x = box->height - box->y;
+		dest->y = box->x;
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED:
+		dest->x = box->width - box->x;
+		dest->y = box->y;
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
+		dest->x = box->y;
+		dest->y = box->x;
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
+		dest->x = box->x;
+		dest->y = box->height - box->y;
+		break;
+	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
+		dest->x = box->height - box->y;
+		dest->y = box->width - box->x;
+	}
+}