Allow to update the cursor hotspot without its pixels

2 files changed, 16 insertions, 3 deletions

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 9e5346a1..ff4dc7f6 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -470,7 +470,7 @@ static void wlr_drm_connector_transform(struct wlr_output *output,
 
 static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 		const uint8_t *buf, int32_t stride, uint32_t width, uint32_t height,
-		int32_t hotspot_x, int32_t hotspot_y) {
+		int32_t hotspot_x, int32_t hotspot_y, bool update_pixels) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	struct wlr_drm_backend *drm = conn->drm;
 	struct wlr_drm_renderer *renderer = &drm->renderer;
@@ -478,7 +478,8 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	struct wlr_drm_plane *plane = crtc->cursor;
 
-	if (!buf) {
+	if (!buf && update_pixels) {
+		// Hide the cursor
 		return drm->iface->crtc_set_cursor(drm, crtc, NULL);
 	}
 
@@ -566,6 +567,11 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 		break;
 	}
 
+	if (!update_pixels) {
+		// Only update the cursor hotspot
+		return true;
+	}
+
 	struct gbm_bo *bo = plane->cursor_bo;
 	uint32_t bo_width = gbm_bo_get_width(bo);
 	uint32_t bo_height = gbm_bo_get_height(bo);
diff --git a/backend/wayland/output.c b/backend/wayland/output.c
index 03b43b35..2616b347 100644
--- a/backend/wayland/output.c
+++ b/backend/wayland/output.c
@@ -54,11 +54,18 @@ static void wlr_wl_output_transform(struct wlr_output *_output,
 
 static bool wlr_wl_output_set_cursor(struct wlr_output *_output,
 		const uint8_t *buf, int32_t stride, uint32_t width, uint32_t height,
-		int32_t hotspot_x, int32_t hotspot_y) {
+		int32_t hotspot_x, int32_t hotspot_y, bool update_pixels) {
 	struct wlr_wl_backend_output *output = (struct wlr_wl_backend_output *)_output;
 	struct wlr_wl_backend *backend = output->backend;
 
+	if (!update_pixels) {
+		// Update hotspot without changing cursor image
+		wlr_wl_output_update_cursor(output, output->enter_serial, hotspot_x,
+			hotspot_y);
+		return true;
+	}
 	if (!buf) {
+		// Hide cursor
 		wl_pointer_set_cursor(output->backend->pointer, output->enter_serial,
 			NULL, 0, 0);
 		return true;