libweston: Add support to set content-protection for a weston_output

For making an output secure, the content-protection should be set for
each of head attached to that output. So whenever the protection for
a weston_output is desired, it means that protection is desired for
each of the weston_head attached to that weston_output.

This patch introduces a new enum in libweston to represent the
requested/current protection statuses, equivalent to the type enum
defined by the weston-secure-output protocol. The new enum helps to
extend the content-protection status and requests to libweston and
the backends.
This patch also adds a new member desired_protection to store the
desired protection for an output in weston_output.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

include/libweston/libweston.h

@@ -169,6 +169,20 @@ enum dpms_enum {
 	WESTON_DPMS_OFF
 };
 
+/* enum for content protection requests/status
+ *
+ * This enum represents the content protection requests and statuses in
+ * libweston and its enum values correspond to those of 'type' enum defined in
+ * weston-content-protection protocol. The values should exactly match to the
+ * values of the 'type' enum of the protocol.
+ */
+
+enum weston_hdcp_protection {
+	WESTON_HDCP_DISABLE = 0,
+	WESTON_HDCP_ENABLE_TYPE_0,
+	WESTON_HDCP_ENABLE_TYPE_1
+};
+
 /** Represents a monitor
  *
  * This object represents a monitor (hardware backends like DRM) or a window
@@ -277,6 +291,8 @@ struct weston_output {
 
 	struct wl_list head_list; /**< List of driven weston_heads */
 
+	enum weston_hdcp_protection desired_protection;
+
 	void (*start_repaint_loop)(struct weston_output *output);
 	int (*repaint)(struct weston_output *output,
 			pixman_region32_t *damage,

libweston/compositor.c

@@ -5873,6 +5873,7 @@ weston_output_init(struct weston_output *output,
 	wl_list_init(&output->link);
 	wl_signal_init(&output->user_destroy_signal);
 	output->enabled = false;
+	output->desired_protection = WESTON_HDCP_DISABLE;
 
 	wl_list_init(&output->head_list);