Merge pull request #257 from emersion/fix-client-cursors

[WIP] Fix client cursors

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);

backend/wayland/output.c

@@ -54,13 +54,24 @@ 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) {
-		wl_pointer_set_cursor(output->backend->pointer, output->enter_serial,
-			NULL, 0, 0);
+		// Hide cursor
+		wl_surface_destroy(output->cursor_surface);
+		munmap(output->cursor_data, output->cursor_buf_size);
+		output->cursor_surface = NULL;
+		output->cursor_buf_size = 0;
+		wlr_wl_output_update_cursor(output, output->enter_serial, hotspot_x,
+			hotspot_y);
 		return true;
 	}
 
@@ -153,7 +164,7 @@ static void wlr_wl_output_destroy(struct wlr_output *_output) {
 
 void wlr_wl_output_update_cursor(struct wlr_wl_backend_output *output,
 			uint32_t serial, int32_t hotspot_x, int32_t hotspot_y) {
-	if (output->cursor_surface && output->backend->pointer && serial) {
+	if (output->backend->pointer && serial) {
 		wl_pointer_set_cursor(output->backend->pointer, serial,
 			output->cursor_surface, hotspot_x, hotspot_y);
 	}

include/rootston/input.h

@@ -79,7 +79,7 @@ struct roots_input {
 	struct wlr_xcursor_theme *theme;
 	struct wlr_xcursor *xcursor;
 	struct wlr_seat *wl_seat;
-	struct roots_view *client_cursor_view;
+	struct wl_client *cursor_client;
 
 	enum roots_cursor_mode mode;
 	struct roots_view *active_view, *last_active_view;

include/wlr/interfaces/wlr_output.h

@@ -11,7 +11,7 @@ struct wlr_output_impl {
 		enum wl_output_transform transform);
 	bool (*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);
 	bool (*move_cursor)(struct wlr_output *output, int x, int y);
 	void (*destroy)(struct wlr_output *output);
 	void (*make_current)(struct wlr_output *output);

rootston/cursor.c

@@ -83,10 +83,16 @@ void cursor_update_position(struct roots_input *input, uint32_t time) {
 	case ROOTS_CURSOR_PASSTHROUGH:
 		view = view_at(desktop, input->cursor->x, input->cursor->y, &surface,
 			&sx, &sy);
-		if (view != input->client_cursor_view) {
+		bool set_compositor_cursor = !view && input->cursor_client;
+		if (view) {
+			struct wl_client *view_client =
+				wl_resource_get_client(view->wlr_surface->resource);
+			set_compositor_cursor = view_client != input->cursor_client;
+		}
+		if (set_compositor_cursor) {
 			wlr_log(L_DEBUG, "Switching to compositor cursor");
 			cursor_set_xcursor_image(input, input->xcursor->images[0]);
-			input->client_cursor_view = NULL;
+			input->cursor_client = NULL;
 		}
 		if (view) {
 			wlr_seat_pointer_notify_enter(input->wl_seat, surface, sx, sy);
@@ -301,18 +307,16 @@ static void handle_request_set_cursor(struct wl_listener *listener,
 		request_set_cursor);
 	struct wlr_seat_pointer_request_set_cursor_event *event = data;
 
-	struct wlr_surface *focused_surface = NULL;
-	double sx, sy;
-	struct roots_view *focused_view = view_at(input->server->desktop,
-		input->cursor->x, input->cursor->y, &focused_surface, &sx, &sy);
-	bool ok = focused_surface != NULL;
-	if (focused_surface != NULL) {
+	struct wlr_surface *focused_surface =
+		event->seat_handle->wlr_seat->pointer_state.focused_surface;
+	bool ok = focused_surface != NULL && focused_surface->resource != NULL;
+	if (ok) {
 		struct wl_client *focused_client =
 			wl_resource_get_client(focused_surface->resource);
 		ok = event->client == focused_client;
 	}
 	if (!ok) {
-		wlr_log(L_DEBUG, "Denying request to set cursor outside view");
+		wlr_log(L_DEBUG, "Denying request to set cursor from unfocused client");
 		return;
 	}
 
@@ -324,7 +328,7 @@ static void handle_request_set_cursor(struct wl_listener *listener,
 			event->hotspot_x, event->hotspot_y);
 	}
 
-	input->client_cursor_view = focused_view;
+	input->cursor_client = event->client;
 }
 
 void cursor_initialize(struct roots_input *input) {

types/wlr_output.c

@@ -127,7 +127,7 @@ static bool set_cursor(struct wlr_output *output, const uint8_t *buf,
 		int32_t hotspot_y) {
 	if (output->impl->set_cursor
 			&& output->impl->set_cursor(output, buf, stride, width, height,
-				hotspot_x, hotspot_y)) {
+				hotspot_x, hotspot_y, true)) {
 		output->cursor.is_sw = false;
 		return true;
 	}
@@ -179,6 +179,10 @@ static inline int64_t timespec_to_msec(const struct timespec *a) {
 
 static void commit_cursor_surface(struct wlr_output *output,
 		struct wlr_surface *surface) {
+	if (output->cursor.is_sw) {
+		return;
+	}
+
 	struct wl_shm_buffer *buffer = wl_shm_buffer_get(surface->current->buffer);
 	if (buffer == NULL) {
 		return;
@@ -231,14 +235,19 @@ static void handle_cursor_surface_destroy(struct wl_listener *listener,
 
 void wlr_output_set_cursor_surface(struct wlr_output *output,
 		struct wlr_surface *surface, int32_t hotspot_x, int32_t hotspot_y) {
-	if (surface && strcmp(surface->role, "cursor") != 0) {
+	if (surface && strcmp(surface->role, "wl_pointer-cursor") != 0) {
 		return;
 	}
 
 	output->cursor.hotspot_x = hotspot_x;
 	output->cursor.hotspot_y = hotspot_y;
 
-	if (surface && output->cursor.surface == surface) {
+	if (surface && surface == output->cursor.surface) {
+		if (output->impl->set_cursor && !output->cursor.is_sw) {
+			// Only update the hotspot
+			output->impl->set_cursor(output, NULL, 0, 0, 0, hotspot_x,
+				hotspot_y, false);
+		}
 		return;
 	}
 
@@ -248,11 +257,22 @@ void wlr_output_set_cursor_surface(struct wlr_output *output,
 		output->cursor.surface = NULL;
 	}
 
+	// Disable hardware cursor
+	// TODO: support hardware cursors
+	output->cursor.is_sw = true;
+	if (output->impl->set_cursor) {
+		output->impl->set_cursor(output, NULL, 0, 0, 0, hotspot_x, hotspot_y,
+			true);
+	}
+
+	//output->cursor.is_sw = output->impl->set_cursor == NULL;
 	output->cursor.surface = surface;
 
 	if (surface != NULL) {
 		wl_signal_add(&surface->events.commit, &output->cursor.surface_commit);
-		wl_signal_add(&surface->events.destroy, &output->cursor.surface_destroy);
+		wl_signal_add(&surface->events.destroy,
+			&output->cursor.surface_destroy);
+		commit_cursor_surface(output, surface);
 	} else {
 		set_cursor(output, NULL, 0, 0, 0, hotspot_x, hotspot_y);
 	}
@@ -333,10 +353,20 @@ void wlr_output_swap_buffers(struct wlr_output *output) {
 		glViewport(0, 0, output->width, output->height);
 		glEnable(GL_BLEND);
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+		struct wlr_texture *texture = output->cursor.texture;
+		struct wlr_renderer *renderer = output->cursor.renderer;
+		if (output->cursor.surface) {
+			texture = output->cursor.surface->texture;
+			renderer = output->cursor.surface->renderer;
+		}
+
+		if (texture && renderer) {
 			float matrix[16];
-		wlr_texture_get_matrix(output->cursor.texture, &matrix, &output->transform_matrix,
+			wlr_texture_get_matrix(texture, &matrix, &output->transform_matrix,
 				output->cursor.x, output->cursor.y);
-		wlr_render_with_matrix(output->cursor.renderer, output->cursor.texture, &matrix);
+			wlr_render_with_matrix(renderer, texture, &matrix);
+		}
 	}
 
 	wl_signal_emit(&output->events.swap_buffers, &output);

types/wlr_seat.c

@@ -28,7 +28,7 @@ static void wl_pointer_set_cursor(struct wl_client *client,
 	if (surface_resource != NULL) {
 		surface = wl_resource_get_user_data(surface_resource);
 
-		if (wlr_surface_set_role(surface, "cursor", resource,
+		if (wlr_surface_set_role(surface, "wl_pointer-cursor", resource,
 				WL_POINTER_ERROR_ROLE) < 0) {
 			return;
 		}