weston: Port fbdev backend to new output handling API

This is a complete port of the fbdev backend that uses
the recently added output handling API for output
configuration.

It is required that the scale and transform values are
set using the previously added functionality.

After everything has been set, output needs to be
enabled manually using weston_output_enable().

v2:

 - Use weston_compositor_add_pending_output().
 - Bump weston_fbdev_backend_config version to 2.

Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Signed-off-by: Armin Krezović <krezovic.armin@gmail.com>

compositor/main.c

@@ -1296,13 +1296,26 @@ load_rdp_backend(struct weston_compositor *c,
 	return ret;
 }
 
+static void
+fbdev_backend_output_configure(struct wl_listener *listener, void *data)
+{
+	struct weston_output *output = data;
+	struct weston_config *wc = wet_get_config(output->compositor);
+	struct weston_config_section *section;
+
+	section = weston_config_get_section(wc, "output", "name", "fbdev");
+
+	wet_output_set_transform(output, section, WL_OUTPUT_TRANSFORM_NORMAL, UINT32_MAX);
+	weston_output_set_scale(output, 1);
+
+	weston_output_enable(output);
+}
+
 static int
 load_fbdev_backend(struct weston_compositor *c,
 		      int *argc, char **argv, struct weston_config *wc)
 {
 	struct weston_fbdev_backend_config config = {{ 0, }};
-	struct weston_config_section *section;
-	char *s = NULL;
 	int ret = 0;
 
 	const struct weston_option fbdev_options[] = {
@@ -1315,12 +1328,6 @@ load_fbdev_backend(struct weston_compositor *c,
 	if (!config.device)
 		config.device = strdup("/dev/fb0");
 
-	section = weston_config_get_section(wc, "output", "name", "fbdev");
-	weston_config_section_get_string(section, "transform", &s, "normal");
-	if (weston_parse_transform(s, &config.output_transform) < 0)
-		weston_log("Invalid transform \"%s\" for output fbdev\n", s);
-	free(s);
-
 	config.base.struct_version = WESTON_FBDEV_BACKEND_CONFIG_VERSION;
 	config.base.struct_size = sizeof(struct weston_fbdev_backend_config);
 	config.configure_device = configure_input_device;
@@ -1329,8 +1336,13 @@ load_fbdev_backend(struct weston_compositor *c,
 	ret = weston_compositor_load_backend(c, WESTON_BACKEND_FBDEV,
 					     &config.base);
 
-	free(config.device);
+	if (ret < 0)
+		goto out;
+
+	wet_set_pending_output_handler(c, fbdev_backend_output_configure);
 
+out:
+	free(config.device);
 	return ret;
 }
 

libweston/compositor-fbdev.c

@@ -425,13 +425,57 @@ fbdev_frame_buffer_destroy(struct fbdev_output *output)
 static void fbdev_output_destroy(struct weston_output *base);
 static void fbdev_output_disable(struct weston_output *base);
 
+static int
+fbdev_output_enable(struct weston_output *base)
+{
+	struct fbdev_output *output = to_fbdev_output(base);
+	struct fbdev_backend *backend = to_fbdev_backend(base->compositor);
+	int fb_fd;
+	struct wl_event_loop *loop;
+
+	/* Create the frame buffer. */
+	fb_fd = fbdev_frame_buffer_open(output, output->device, &output->fb_info);
+	if (fb_fd < 0) {
+		weston_log("Creating frame buffer failed.\n");
+		return -1;
+	}
+
+	if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
+		weston_log("Mapping frame buffer failed.\n");
+		return -1;
+	}
+
+	output->base.start_repaint_loop = fbdev_output_start_repaint_loop;
+	output->base.repaint = fbdev_output_repaint;
+
+	if (pixman_renderer_output_create(&output->base) < 0)
+		goto out_hw_surface;
+
+	loop = wl_display_get_event_loop(backend->compositor->wl_display);
+	output->finish_frame_timer =
+		wl_event_loop_add_timer(loop, finish_frame_handler, output);
+
+	weston_log("fbdev output %d×%d px\n",
+	           output->mode.width, output->mode.height);
+	weston_log_continue(STAMP_SPACE "guessing %d Hz and 96 dpi\n",
+	                    output->mode.refresh / 1000);
+
+	return 0;
+
+out_hw_surface:
+	pixman_image_unref(output->hw_surface);
+	output->hw_surface = NULL;
+	fbdev_frame_buffer_destroy(output);
+
+	return -1;
+}
+
 static int
 fbdev_output_create(struct fbdev_backend *backend,
                     const char *device)
 {
 	struct fbdev_output *output;
 	int fb_fd;
-	struct wl_event_loop *loop;
 
 	weston_log("Creating fbdev output.\n");
 
@@ -449,14 +493,12 @@ fbdev_output_create(struct fbdev_backend *backend,
 		goto out_free;
 	}
 
-	if (fbdev_frame_buffer_map(output, fb_fd) < 0) {
-		weston_log("Mapping frame buffer failed.\n");
-		goto out_free;
-	}
-
-	output->base.start_repaint_loop = fbdev_output_start_repaint_loop;
-	output->base.repaint = fbdev_output_repaint;
+	output->base.name = strdup("fbdev");
 	output->base.destroy = fbdev_output_destroy;
+	output->base.disable = NULL;
+	output->base.enable = fbdev_output_enable;
+
+	weston_output_init_pending(&output->base, backend->compositor);
 
 	/* only one static mode in list */
 	output->mode.flags =
@@ -471,35 +513,16 @@ fbdev_output_create(struct fbdev_backend *backend,
 	output->base.subpixel = WL_OUTPUT_SUBPIXEL_UNKNOWN;
 	output->base.make = "unknown";
 	output->base.model = output->fb_info.id;
-	output->base.name = strdup("fbdev");
 
-	weston_output_init(&output->base, backend->compositor,
-	                   0, 0, output->fb_info.width_mm,
-	                   output->fb_info.height_mm,
-	                   backend->output_transform,
-			   1);
+	output->base.mm_width = output->fb_info.width_mm;
+	output->base.mm_height = output->fb_info.height_mm;
 
-	if (pixman_renderer_output_create(&output->base) < 0)
-		goto out_hw_surface;
+	close(fb_fd);
 
-	loop = wl_display_get_event_loop(backend->compositor->wl_display);
-	output->finish_frame_timer =
-		wl_event_loop_add_timer(loop, finish_frame_handler, output);
-
-	weston_compositor_add_output(backend->compositor, &output->base);
-
-	weston_log("fbdev output %d×%d px\n",
-	           output->mode.width, output->mode.height);
-	weston_log_continue(STAMP_SPACE "guessing %d Hz and 96 dpi\n",
-	                    output->mode.refresh / 1000);
+	weston_compositor_add_pending_output(&output->base, backend->compositor);
 
 	return 0;
 
-out_hw_surface:
-	pixman_image_unref(output->hw_surface);
-	output->hw_surface = NULL;
-	weston_output_destroy(&output->base);
-	fbdev_frame_buffer_destroy(output);
 out_free:
 	free(output->device);
 	free(output);
@@ -721,7 +744,6 @@ fbdev_backend_create(struct weston_compositor *compositor,
 	backend->base.restore = fbdev_restore;
 
 	backend->prev_state = WESTON_COMPOSITOR_ACTIVE;
-	backend->output_transform = param->output_transform;
 
 	weston_setup_vt_switch_bindings(compositor);
 
@@ -757,7 +779,6 @@ config_init_to_defaults(struct weston_fbdev_backend_config *config)
 	 * udev, rather than passing a device node in as a parameter. */
 	config->tty = 0; /* default to current tty */
 	config->device = "/dev/fb0"; /* default frame buffer */
-	config->output_transform = WL_OUTPUT_TRANSFORM_NORMAL;
 }
 
 WL_EXPORT int

libweston/compositor-fbdev.h

@@ -34,7 +34,7 @@ extern "C" {
 
 #include "compositor.h"
 
-#define WESTON_FBDEV_BACKEND_CONFIG_VERSION 1
+#define WESTON_FBDEV_BACKEND_CONFIG_VERSION 2
 
 struct libinput_device;
 
@@ -44,8 +44,6 @@ struct weston_fbdev_backend_config {
 	int tty;
 	char *device;
 
-	uint32_t output_transform;
-
 	/** Callback used to configure input devices.
 	 *
 	 * This function will be called by the backend when a new input device