text: /*
   * Copyright © 2008-2011 Kristian Høgsberg
   * Copyright © 2012, 2017, 2018 Collabora, Ltd.
   * Copyright © 2017, 2018 General Electric Company
   *
   * Permission is hereby granted, free of charge, to any person obtaining
   * a copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice (including the
   * next paragraph) shall be included in all copies or substantial
   * portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  #ifndef _WAYLAND_SYSTEM_COMPOSITOR_H_
  #define _WAYLAND_SYSTEM_COMPOSITOR_H_
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  #include <stdbool.h>
  #include <stdint.h>
  #include <time.h>
  #include <pixman.h>
  #include <xkbcommon/xkbcommon.h>
  
  #define WL_HIDE_DEPRECATED
  #include <wayland-server.h>
  
  #include <GLES2/gl2.h>
  #include <GLES2/gl2ext.h>
  #include <EGL/egl.h>
  #include <EGL/eglext.h>
  
  #include "matrix.h"
  #include "config-parser.h"
  #include "zalloc.h"
  
  #include <assert.h>
  #include <dlfcn.h>
  #include <stdlib.h>
  #include <sys/time.h>
  #include "timeline-object.h"
  
  #ifndef MIN
  #define MIN(x,y) (((x) < (y)) ? (x) : (y))
  #endif
  
  #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
  
  #define container_of(ptr, type, member) ({				\
  	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
  	(type *)( (char *)__mptr - offsetof(type,member) );})
  
  struct weston_geometry {
  	int32_t x, y;
  	int32_t width, height;
  };
  
  struct weston_position {
  	int32_t x, y;
  };
  
  struct weston_size {
  	int32_t width, height;
  };
  
  struct weston_transform {
  	struct weston_matrix matrix;
  	struct wl_list link;
  };
  
  /** 2D device coordinates normalized to [0, 1] range */
  struct weston_point2d_device_normalized {
  	double x;
  	double y;
  };
  
  struct weston_surface;
  struct weston_buffer;
  struct shell_surface;
  struct weston_seat;
  struct weston_output;
  struct input_method;
  struct weston_pointer;
  struct linux_dmabuf_buffer;
  struct weston_recorder;
  struct weston_pointer_constraint;
  
  enum weston_keyboard_modifier {
  	MODIFIER_CTRL = (1 << 0),
  	MODIFIER_ALT = (1 << 1),
  	MODIFIER_SUPER = (1 << 2),
  	MODIFIER_SHIFT = (1 << 3),
  };
  
  enum weston_keyboard_locks {
  	WESTON_NUM_LOCK = (1 << 0),
  	WESTON_CAPS_LOCK = (1 << 1),
  };
  
  enum weston_led {
  	LED_NUM_LOCK = (1 << 0),
  	LED_CAPS_LOCK = (1 << 1),
  	LED_SCROLL_LOCK = (1 << 2),
  };
  
  enum weston_mode_aspect_ratio {
  	/** The picture aspect ratio values, for the aspect_ratio field of
  	 *  weston_mode. The values here, are taken from
  	 *  DRM_MODE_PICTURE_ASPECT_* from drm_mode.h.
  	 */
  	WESTON_MODE_PIC_AR_NONE = 0,	/* DRM_MODE_PICTURE_ASPECT_NONE */
  	WESTON_MODE_PIC_AR_4_3 = 1,	/* DRM_MODE_PICTURE_ASPECT_4_3 */
  	WESTON_MODE_PIC_AR_16_9 = 2,	/* DRM_MODE_PICTURE_ASPECT_16_9 */
  	WESTON_MODE_PIC_AR_64_27 = 3,	/* DRM_MODE_PICTURE_ASPECT_64_27 */
  	WESTON_MODE_PIC_AR_256_135 = 4,	/* DRM_MODE_PICTURE_ASPECT_256_135*/
  };
  
  
  
  struct weston_mode {
  	uint32_t flags;
  	enum weston_mode_aspect_ratio aspect_ratio;
  	int32_t width, height;
  	uint32_t refresh;
  	struct wl_list link;
  };
  
  struct weston_shell_client {
  	void (*send_configure)(struct weston_surface *surface, int32_t width, int32_t height);
  	void (*send_position)(struct weston_surface *surface, int32_t x, int32_t y);
  };
  
  struct weston_shell_interface {
  	void *shell;			/* either desktop or tablet */
  
  	struct shell_surface *(*create_shell_surface)(void *shell,
  						      struct weston_surface *surface,
  						      const struct weston_shell_client *client);
  	void (*set_toplevel)(struct shell_surface *shsurf);
  
  	void (*set_transient)(struct shell_surface *shsurf,
  			      struct weston_surface *parent,
  			      int x, int y, uint32_t flags);
  	void (*set_fullscreen)(struct shell_surface *shsurf,
  			       uint32_t method,
  			       uint32_t framerate,
  			       struct weston_output *output);
  	void (*set_xwayland)(struct shell_surface *shsurf,
  			       int x, int y, uint32_t flags);
  	int (*move)(struct shell_surface *shsurf, struct weston_pointer *pointer);
  	int (*resize)(struct shell_surface *shsurf,
  		      struct weston_pointer *pointer, uint32_t edges);
  	void (*set_title)(struct shell_surface *shsurf,
  	                  const char *title);
  	void (*set_window_geometry)(struct shell_surface *shsurf,
  				    int32_t x, int32_t y,
  				    int32_t width, int32_t height);
  	void (*set_maximized)(struct shell_surface *shsurf);
  	void (*set_pid)(struct shell_surface *shsurf, pid_t pid);
  	void (*get_output_work_area)(void *shell, struct weston_output *output, pixman_rectangle32_t *area);
  };
  
  struct weston_animation {
  	void (*frame)(struct weston_animation *animation,
  		      struct weston_output *output,
  		      const struct timespec *time);
  	int frame_counter;
  	struct wl_list link;
  };
  
  enum {
  	WESTON_SPRING_OVERSHOOT,
  	WESTON_SPRING_CLAMP,
  	WESTON_SPRING_BOUNCE
  };
  
  struct weston_spring {
  	double k;
  	double friction;
  	double current;
  	double target;
  	double previous;
  	double min, max;
  	struct timespec timestamp;
  	uint32_t clip;
  };
  
  struct weston_output_zoom {
  	bool active;
  	float increment;
  	float level;
  	float max_level;
  	float trans_x, trans_y;
  	struct {
  		double x, y;
  	} current;
  	struct weston_seat *seat;
  	struct weston_animation animation_z;
  	struct weston_spring spring_z;
  	struct wl_listener motion_listener;
  };
  
  /* bit compatible with drm definitions. */
  enum dpms_enum {
  	WESTON_DPMS_ON,
  	WESTON_DPMS_STANDBY,
  	WESTON_DPMS_SUSPEND,
  	WESTON_DPMS_OFF
  };
  
  struct ias_plugin;
  
  /** Represents a monitor
   *
   * This object represents a monitor (hardware backends like DRM) or a window
   * (windowed nested backends).
   */
  struct weston_head {
  	struct weston_compositor *compositor;	/**< owning compositor */
  	struct wl_list compositor_link;	/**< in weston_compositor::head_list */
  	struct wl_signal destroy_signal;	/**< destroy callbacks */
  
  	struct weston_output *output;	/**< the output driving this head */
  	struct wl_list output_link;	/**< in weston_output::head_list */
  
  	struct wl_list resource_list;	/**< wl_output protocol objects */
  	struct wl_global *global;	/**< wl_output global */
  
  	int32_t mm_width;		/**< physical image width in mm */
  	int32_t mm_height;		/**< physical image height in mm */
  	char *make;			/**< monitor manufacturer (PNP ID) */
  	char *model;			/**< monitor model */
  	char *serial_number;		/**< monitor serial */
  	uint32_t subpixel;		/**< enum wl_output_subpixel */
  	bool connection_internal;	/**< embedded monitor (e.g. laptop) */
  	bool device_changed;		/**< monitor information has changed */
  
  	char *name;			/**< head name, e.g. connector name */
  	bool connected;			/**< is physically connected */
  };
  
  struct weston_output {
  	uint32_t id;
  	char *name;
  
  	/** Matches the lifetime from the user perspective */
  	struct wl_signal user_destroy_signal;
  
  	void *renderer_state;
  
  	struct wl_list link;
  	struct weston_compositor *compositor;
  
  	/** From global to output buffer coordinates. */
  	struct weston_matrix matrix;
  	/** From output buffer to global coordinates. */
  	struct weston_matrix inverse_matrix;
  
  	struct wl_list animation_list;
  	int32_t x, y, width, height;
  
  	/** Output area in global coordinates, simple rect */
  	pixman_region32_t region;
  	pixman_region32_t damage;
  	pixman_region32_t previous_damage;
  
  	/** True if damage has occurred since the last repaint for this output;
  	 *  if set, a repaint will eventually occur. */
  	bool repaint_needed;
  
  	/** Used only between repaint_begin and repaint_cancel. */
  	bool repainted;
  
  	/** State of the repaint loop */
  	enum {
  		REPAINT_NOT_SCHEDULED = 0, /**< idle; no repaint will occur */
  		REPAINT_BEGIN_FROM_IDLE, /**< start_repaint_loop scheduled */
  		REPAINT_SCHEDULED, /**< repaint is scheduled to occur */
  		REPAINT_AWAITING_COMPLETION, /**< last repaint not yet finished */
  	} repaint_status;
  
  	/** If repaint_status is REPAINT_SCHEDULED, contains the time the
  	 *  next repaint should be run */
  	struct timespec next_repaint;
  
  	/** For cancelling the idle_repaint callback on output destruction. */
  	struct wl_event_source *idle_repaint_source;
  
  	struct weston_output_zoom zoom;
  	int dirty;
  	struct wl_signal frame_signal;
  	struct wl_signal destroy_signal;	/**< sent when disabled */
  	int move_x, move_y;
  	struct timespec frame_time; /* presentation timestamp */
  	uint64_t msc;        /* media stream counter */
  	int disable_planes;
  	int destroying;
  	struct wl_list feedback_list;
  
  	uint32_t transform;
  	int32_t native_scale;
  	int32_t current_scale;
  	int32_t original_scale;
  
  	struct weston_mode *native_mode;
  	struct weston_mode *current_mode;
  	struct weston_mode *original_mode;
  	struct wl_list mode_list;
  
  	struct wl_list head_list; /**< List of driven weston_heads */
  
  	void (*start_repaint_loop)(struct weston_output *output);
  	int (*repaint)(struct weston_output *output,
  			pixman_region32_t *damage,
  			void *repaint_data);
  	void (*destroy)(struct weston_output *output);
  	void (*assign_planes)(struct weston_output *output, void *repaint_data);
  	int (*switch_mode)(struct weston_output *output, struct weston_mode *mode);
  
  	/* backlight values are on 0-255 range, where higher is brighter */
  	int32_t backlight_current;
  	void (*set_backlight)(struct weston_output *output, uint32_t value);
  	void (*set_dpms)(struct weston_output *output, enum dpms_enum level);
  
  	uint16_t gamma_size;
  	void (*set_gamma)(struct weston_output *output,
  			  uint16_t size,
  			  uint16_t *r,
  			  uint16_t *g,
  			  uint16_t *b);
  
  	struct weston_timeline_object timeline;
  
  	bool enabled; /**< is in the output_list, not pending list */
  	int scale;
  
  	int (*enable)(struct weston_output *output);
  	int (*disable)(struct weston_output *output);
  
  	/** Attach a head in the backend
  	 *
  	 * @param output The output to attach to.
  	 * @param head The head to attach.
  	 * @return 0 on success, -1 on failure.
  	 *
  	 * Do anything necessary to account for a new head being attached to
  	 * the output, and check any conditions possible. On failure, both
  	 * the head and the output must be left as before the call.
  	 *
  	 * Libweston core will add the head to the head_list after a successful
  	 * call.
  	 */
  	int (*attach_head)(struct weston_output *output,
  			   struct weston_head *head);
  
  	/** Detach a head in the backend
  	 *
  	 * @param output The output to detach from.
  	 * @param head The head to detach.
  	 *
  	 * Do any clean-up necessary to detach this head from the output.
  	 * The head has already been removed from the output's head_list.
  	 */
  	void (*detach_head)(struct weston_output *output,
  			    struct weston_head *head);
  
  	/***
  	 *** IAS-specific additions
  	 ***
  	 *** Keep below upstream fields above for ABI-compatibility
  	 ***/
  
  	int (*is_input_per_output)(struct weston_output *output);
  
  	/* After finishing a redraw, should we immediately schedule another one? */
  	int (*repeat_redraw)(struct weston_output *output);
  
  	/**plugins 2.0 **/
  	struct ias_plugin* plugin;
  	struct wl_signal commit_signal;
  };
  
  enum weston_pointer_motion_mask {
  	WESTON_POINTER_MOTION_ABS = 1 << 0,
  	WESTON_POINTER_MOTION_REL = 1 << 1,
  	WESTON_POINTER_MOTION_REL_UNACCEL = 1 << 2,
  };
  
  struct weston_pointer_motion_event {
  	uint32_t mask;
  	struct timespec time;
  	double x;
  	double y;
  	double dx;
  	double dy;
  	double dx_unaccel;
  	double dy_unaccel;
  };
  
  struct weston_pointer_axis_event {
  	uint32_t axis;
  	double value;
  	bool has_discrete;
  	int32_t discrete;
  };
  
  struct weston_pointer_grab;
  struct weston_pointer_grab_interface {
  	void (*focus)(struct weston_pointer_grab *grab);
  	void (*motion)(struct weston_pointer_grab *grab,
  		       const struct timespec *time,
  		       struct weston_pointer_motion_event *event);
  	void (*button)(struct weston_pointer_grab *grab,
  		       const struct timespec *time,
  		       uint32_t button, uint32_t state);
  	void (*axis)(struct weston_pointer_grab *grab,
  		     const struct timespec *time,
  		     struct weston_pointer_axis_event *event);
  	void (*axis_source)(struct weston_pointer_grab *grab, uint32_t source);
  	void (*frame)(struct weston_pointer_grab *grab);
  	void (*cancel)(struct weston_pointer_grab *grab);
  };
  
  struct weston_pointer_grab {
  	const struct weston_pointer_grab_interface *interface;
  	struct weston_pointer *pointer;
  };
  
  struct weston_keyboard_grab;
  struct weston_keyboard_grab_interface {
  	void (*key)(struct weston_keyboard_grab *grab,
  		    const struct timespec *time, uint32_t key, uint32_t state);
  	void (*modifiers)(struct weston_keyboard_grab *grab, uint32_t serial,
  			  uint32_t mods_depressed, uint32_t mods_latched,
  			  uint32_t mods_locked, uint32_t group);
  	void (*cancel)(struct weston_keyboard_grab *grab);
  };
  
  struct weston_keyboard_grab {
  	const struct weston_keyboard_grab_interface *interface;
  	struct weston_keyboard *keyboard;
  };
  
  struct weston_touch_grab;
  struct weston_touch_grab_interface {
  	void (*down)(struct weston_touch_grab *grab,
  			const struct timespec *time,
  			int touch_id,
  			wl_fixed_t sx,
  			wl_fixed_t sy);
  	void (*up)(struct weston_touch_grab *grab,
  			const struct timespec *time,
  			int touch_id);
  	void (*motion)(struct weston_touch_grab *grab,
  			const struct timespec *time,
  			int touch_id,
  			wl_fixed_t sx,
  			wl_fixed_t sy);
  	void (*frame)(struct weston_touch_grab *grab);
  	void (*cancel)(struct weston_touch_grab *grab);
  };
  
  struct weston_touch_grab {
  	const struct weston_touch_grab_interface *interface;
  	struct weston_touch *touch;
  };
  
  struct weston_data_offer {
  	struct wl_resource *resource;
  	struct weston_data_source *source;
  	struct wl_listener source_destroy_listener;
  	uint32_t dnd_actions;
  	enum wl_data_device_manager_dnd_action preferred_dnd_action;
  	bool in_ask;
  };
  
  struct weston_data_source {
  	struct wl_resource *resource;
  	struct wl_signal destroy_signal;
  	struct wl_array mime_types;
  	struct weston_data_offer *offer;
  	struct weston_seat *seat;
  	bool accepted;
  	bool actions_set;
  	uint32_t dnd_actions;
  	enum wl_data_device_manager_dnd_action current_dnd_action;
  	enum wl_data_device_manager_dnd_action compositor_action;
  
  	void (*accept)(struct weston_data_source *source,
  		       uint32_t serial, const char *mime_type);
  	void (*send)(struct weston_data_source *source,
  		     const char *mime_type, int32_t fd);
  	void (*cancel)(struct weston_data_source *source);
  };
  
  struct weston_pointer_client {
  	struct wl_list link;
  	struct wl_client *client;
  	struct wl_list pointer_resources;
  	struct wl_list relative_pointer_resources;
  };
  
  struct weston_pointer {
  	struct weston_seat *seat;
  
  	struct wl_list pointer_clients;
  
  	struct weston_view *focus;
  	struct weston_pointer_client *focus_client;
  	uint32_t focus_serial;
  	struct wl_listener focus_view_listener;
  	struct wl_listener focus_resource_listener;
  	struct wl_signal focus_signal;
  	struct wl_signal motion_signal;
  	struct wl_signal destroy_signal;
  
  	struct weston_view *sprite;
  	struct wl_listener sprite_destroy_listener;
  	int32_t hotspot_x, hotspot_y;
  
  	struct weston_pointer_grab *grab;
  	struct weston_pointer_grab default_grab;
  	wl_fixed_t grab_x, grab_y;
  	uint32_t grab_button;
  	uint32_t grab_serial;
  	struct timespec grab_time;
  
  	wl_fixed_t x, y;
  	wl_fixed_t sx, sy;
  	uint32_t button_count;
  
  	bool skip_pointer_move;
  
  	struct wl_listener output_destroy_listener;
  
  	struct wl_list timestamps_list;
  };
  
  /** libinput style calibration matrix
   *
   * See https://wayland.freedesktop.org/libinput/doc/latest/absolute_axes.html
   * and libinput_device_config_calibration_set_matrix().
   */
  struct weston_touch_device_matrix {
  	float m[6];
  };
  
  struct weston_touch_device;
  
  /** Operations for a calibratable touchscreen */
  struct weston_touch_device_ops {
  	/** Get the associated output if existing. */
  	struct weston_output *(*get_output)(struct weston_touch_device *device);
  
  	/** Get the name of the associated head if existing. */
  	const char *
  	(*get_calibration_head_name)(struct weston_touch_device *device);
  
  	/** Retrieve the current calibration matrix. */
  	void (*get_calibration)(struct weston_touch_device *device,
  				struct weston_touch_device_matrix *cal);
  
  	/** Set a new calibration matrix. */
  	void (*set_calibration)(struct weston_touch_device *device,
  				const struct weston_touch_device_matrix *cal);
  };
  
  enum weston_touch_mode {
  	/** Normal touch event handling */
  	WESTON_TOUCH_MODE_NORMAL,
  
  	/** Prepare moving to WESTON_TOUCH_MODE_CALIB.
  	 *
  	 * Move to WESTON_TOUCH_MODE_CALIB as soon as no touches are down on
  	 * any seat. Until then, all touch events are routed normally.
  	 */
  	WESTON_TOUCH_MODE_PREP_CALIB,
  
  	/** Calibration mode
  	 *
  	 * Only a single weston_touch_device forwards events to the calibrator
  	 * all other touch device cause a calibrator "wrong device" event to
  	 * be sent.
  	 */
  	WESTON_TOUCH_MODE_CALIB,
  
  	/** Prepare moving to WESTON_TOUCH_MODE_NORMAL.
  	 *
  	 * Move to WESTON_TOUCH_MODE_NORMAL as soon as no touches are down on
  	 * any seat. Until then, touch events are routed as in
  	 * WESTON_TOUCH_MODE_CALIB except "wrong device" events are not sent.
  	 */
  	WESTON_TOUCH_MODE_PREP_NORMAL
  };
  
  /** Represents a physical touchscreen input device */
  struct weston_touch_device {
  	char *syspath;			/**< unique name */
  
  	struct weston_touch *aggregate;	/**< weston_touch this is part of */
  	struct wl_list link;		/**< in weston_touch::device_list */
  	struct wl_signal destroy_signal;	/**< destroy notifier */
  
  	void *backend_data;		/**< backend-specific private */
  
  	const struct weston_touch_device_ops *ops;
  	struct weston_touch_device_matrix saved_calibration;
  };
  
  /** Represents a set of touchscreen devices aggregated under a seat */
  struct weston_touch {
  	struct weston_seat *seat;
  
  	struct wl_list device_list;	/* struct weston_touch_device::link */
  
  	struct wl_list resource_list;
  	struct wl_list focus_resource_list;
  	struct weston_view *focus;
  	struct wl_listener focus_view_listener;
  	struct wl_listener focus_resource_listener;
  	uint32_t focus_serial;
  	struct wl_signal focus_signal;
  
  	uint32_t num_tp;
  
  	struct weston_touch_grab *grab;
  	struct weston_touch_grab default_grab;
  	int grab_touch_id;
  	wl_fixed_t grab_x, grab_y;
  	uint32_t grab_serial;
  	struct timespec grab_time;
  
  	struct wl_list timestamps_list;
  };
  
  void
  weston_pointer_motion_to_abs(struct weston_pointer *pointer,
  			     struct weston_pointer_motion_event *event,
  			     wl_fixed_t *x, wl_fixed_t *y);
  
  void
  weston_pointer_send_motion(struct weston_pointer *pointer,
  			   const struct timespec *time,
  			   struct weston_pointer_motion_event *event);
  bool
  weston_pointer_has_focus_resource(struct weston_pointer *pointer);
  void
  weston_pointer_send_button(struct weston_pointer *pointer,
  			   const struct timespec *time,
  			   uint32_t button, uint32_t state_w);
  void
  weston_pointer_send_axis(struct weston_pointer *pointer,
  			 const struct timespec *time,
  			 struct weston_pointer_axis_event *event);
  void
  weston_pointer_send_axis_source(struct weston_pointer *pointer,
  				uint32_t source);
  void
  weston_pointer_send_frame(struct weston_pointer *pointer);
  
  void
  weston_pointer_set_focus(struct weston_pointer *pointer,
  			 struct weston_view *view,
  			 wl_fixed_t sx, wl_fixed_t sy);
  void
  weston_pointer_clear_focus(struct weston_pointer *pointer);
  void
  weston_pointer_start_grab(struct weston_pointer *pointer,
  			  struct weston_pointer_grab *grab);
  void
  weston_pointer_end_grab(struct weston_pointer *pointer);
  void
  weston_pointer_clamp(struct weston_pointer *pointer,
  			    wl_fixed_t *fx, wl_fixed_t *fy);
  void
  weston_pointer_move(struct weston_pointer *pointer,
  		    struct weston_pointer_motion_event *event);
  void
  weston_pointer_set_default_grab(struct weston_pointer *pointer,
  		const struct weston_pointer_grab_interface *interface);
  
  void
  weston_pointer_constraint_destroy(struct weston_pointer_constraint *constraint);
  
  void
  weston_keyboard_set_focus(struct weston_keyboard *keyboard,
  			  struct weston_surface *surface);
  void
  weston_keyboard_start_grab(struct weston_keyboard *device,
  			   struct weston_keyboard_grab *grab);
  void
  weston_keyboard_end_grab(struct weston_keyboard *keyboard);
  int
  /*
   * 'mask' and 'value' should be a bitwise mask of one or more
   * valued of the weston_keyboard_locks enum.
   */
  weston_keyboard_set_locks(struct weston_keyboard *keyboard,
  			  uint32_t mask, uint32_t value);
  
  bool
  weston_keyboard_has_focus_resource(struct weston_keyboard *keyboard);
  void
  weston_keyboard_send_key(struct weston_keyboard *keyboard,
  			 const struct timespec *time, uint32_t key,
  			 enum wl_keyboard_key_state state);
  void
  weston_keyboard_send_modifiers(struct weston_keyboard *keyboard,
  			       uint32_t serial, uint32_t mods_depressed,
  			       uint32_t mods_latched,
  			       uint32_t mods_locked, uint32_t group);
  
  void
  weston_touch_set_focus(struct weston_touch *touch,
  		       struct weston_view *view);
  void
  weston_touch_start_grab(struct weston_touch *touch,
  			struct weston_touch_grab *grab);
  void
  weston_touch_end_grab(struct weston_touch *touch);
  
  bool
  weston_touch_has_focus_resource(struct weston_touch *touch);
  void
  weston_touch_send_down(struct weston_touch *touch, const struct timespec *time,
  		       int touch_id, wl_fixed_t x, wl_fixed_t y);
  void
  weston_touch_send_up(struct weston_touch *touch, const struct timespec *time,
  		     int touch_id);
  void
  weston_touch_send_motion(struct weston_touch *touch,
  			 const struct timespec *time, int touch_id,
  			 wl_fixed_t x, wl_fixed_t y);
  void
  weston_touch_send_frame(struct weston_touch *touch);
  
  struct weston_touch_device *
  weston_touch_create_touch_device(struct weston_touch *touch,
  				 const char *syspath,
  				 void *backend_data,
  				 const struct weston_touch_device_ops *ops);
  
  void
  weston_touch_device_destroy(struct weston_touch_device *device);
  
  bool
  weston_touch_device_can_calibrate(struct weston_touch_device *device);
  
  void
  wl_data_device_set_keyboard_focus(struct weston_seat *seat);
  
  int
  wl_data_device_manager_init(struct wl_display *display);
  
  
  void
  weston_seat_set_selection(struct weston_seat *seat,
  			  struct weston_data_source *source, uint32_t serial);
  void
  weston_seat_send_selection(struct weston_seat *seat, struct wl_client *client);
  
  int
  weston_pointer_start_drag(struct weston_pointer *pointer,
  		       struct weston_data_source *source,
  		       struct weston_surface *icon,
  		       struct wl_client *client);
  int
  weston_touch_start_drag(struct weston_touch *touch,
  			struct weston_data_source *source,
  			struct weston_surface *icon,
  			struct wl_client *client);
  
  struct weston_xkb_info {
  	struct xkb_keymap *keymap;
  	size_t keymap_size;
  	char *keymap_string;
  	int32_t ref_count;
  	xkb_mod_index_t shift_mod;
  	xkb_mod_index_t caps_mod;
  	xkb_mod_index_t ctrl_mod;
  	xkb_mod_index_t alt_mod;
  	xkb_mod_index_t mod2_mod;
  	xkb_mod_index_t mod3_mod;
  	xkb_mod_index_t super_mod;
  	xkb_mod_index_t mod5_mod;
  	xkb_led_index_t num_led;
  	xkb_led_index_t caps_led;
  	xkb_led_index_t scroll_led;
  };
  
  
  
  /*
   * Custom surface
   */
  struct custom_surface {
  	struct weston_surface *surf;
  	struct wl_list link;
  };
  
  /*
   * Structure used to keep state of the last
   * keyboard focus change
   */
  
  struct weston_kbd_state {
  	struct weston_surface *focus; /* new focus after change */
  	struct wl_list prev_focus_list; /* history list of focuses before change */
  };
  
  struct weston_keyboard {
  	struct weston_seat *seat;
  
  	struct wl_list resource_list;
  	struct wl_list focus_resource_list;
  	struct weston_surface *focus;
  	struct wl_listener focus_resource_listener;
  	uint32_t focus_serial;
  	struct wl_signal focus_signal;
  
  	struct weston_keyboard_grab *grab;
  	struct weston_keyboard_grab default_grab;
  	uint32_t grab_key;
  	uint32_t grab_serial;
  	struct timespec grab_time;
  
  	struct wl_array keys;
  
  	struct {
  		uint32_t mods_depressed;
  		uint32_t mods_latched;
  		uint32_t mods_locked;
  		uint32_t group;
  	} modifiers;
  
  	struct weston_keyboard_grab input_method_grab;
  	struct wl_resource *input_method_resource;
  
  	struct weston_xkb_info *xkb_info;
  	struct {
  		struct xkb_state *state;
  		enum weston_led leds;
  	} xkb_state;
  	struct xkb_keymap *pending_keymap;
  
  	struct weston_kbd_state last_state; /* keyboard state after last focus change */
  
  	struct wl_list timestamps_list;
  };
  
  struct weston_seat {
  	struct wl_list base_resource_list;
  
  	struct wl_global *global;
  
  	struct weston_pointer *pointer_state;
  	struct weston_keyboard *keyboard_state;
  	struct weston_touch *touch_state;
  	int pointer_device_count;
  	int keyboard_device_count;
  	int touch_device_count;
  
  	struct weston_output *output; /* constraint */
  
  	struct wl_signal destroy_signal;
  	struct wl_signal updated_caps_signal;
  
  	struct weston_compositor *compositor;
  	struct wl_list link;
  	enum weston_keyboard_modifier modifier_state;
  	struct weston_surface *saved_kbd_focus;
  	struct wl_listener saved_kbd_focus_listener;
  	struct wl_list drag_resource_list;
  
  	uint32_t selection_serial;
  	struct weston_data_source *selection_data_source;
  	struct wl_listener selection_data_source_listener;
  	struct wl_signal selection_signal;
  
  	void (*led_update)(struct weston_seat *ws, enum weston_led leds);
  
  	struct input_method *input_method;
  	char *seat_name;
  
  	/***
  	 *** IAS-specific additions
  	 ***
  	 *** Keep below upstream fields above for ABI-compatibility
  	 ***/
  	uint32_t output_mask;
  };
  
  enum {
  	WESTON_COMPOSITOR_ACTIVE,	/* normal rendering and events */
  	WESTON_COMPOSITOR_IDLE,		/* shell->unlock called on activity */
  	WESTON_COMPOSITOR_OFFSCREEN,	/* no rendering, no frame events */
  	WESTON_COMPOSITOR_SLEEPING	/* same as offscreen, but also set dpms
                                           * to off */
  };
  
  struct weston_layer_entry {
  	struct wl_list link;
  	struct weston_layer *layer;
  };
  
  /**
   * Higher value means higher in the stack.
   *
   * These values are based on well-known concepts in a classic desktop
   * environment. Third-party modules based on libweston are encouraged to use
   * them to integrate better with other projects.
   *
   * A fully integrated environment can use any value, based on these or not,
   * at their discretion.
   */
  enum weston_layer_position {
  	/*
  	 * Special value to make the layer invisible and still rendered.
  	 * This is used by compositors wanting e.g. minimized surfaces to still
  	 * receive frame callbacks.
  	 */
  	WESTON_LAYER_POSITION_HIDDEN     = 0x00000000,
  
  	/*
  	 * There should always be a background layer with a surface covering
  	 * the visible area.
  	 *
  	 * If the compositor handles the background itself, it should use
  	 * BACKGROUND.
  	 *
  	 * If the compositor supports runtime-loadable modules to set the
  	 * background, it should put a solid color surface at (BACKGROUND - 1)
  	 * and modules must use BACKGROUND.
  	 */
  	WESTON_LAYER_POSITION_BACKGROUND = 0x00000002,
  
  	/* For "desktop widgets" and applications like conky. */
  	WESTON_LAYER_POSITION_BOTTOM_UI  = 0x30000000,
  
  	/* For regular applications, only one layer should have this value
  	 * to ensure proper stacking control. */
  	WESTON_LAYER_POSITION_NORMAL     = 0x50000000,
  
  	/* For desktop UI, like panels. */
  	WESTON_LAYER_POSITION_UI         = 0x80000000,
  
  	/* For fullscreen applications that should cover UI. */
  	WESTON_LAYER_POSITION_FULLSCREEN = 0xb0000000,
  
  	/* For special UI like on-screen keyboard that fullscreen applications
  	 * will need. */
  	WESTON_LAYER_POSITION_TOP_UI     = 0xe0000000,
  
  	/* For the lock surface. */
  	WESTON_LAYER_POSITION_LOCK       = 0xffff0000,
  
  	/* Values reserved for libweston internal usage */
  	WESTON_LAYER_POSITION_CURSOR     = 0xfffffffe,
  	WESTON_LAYER_POSITION_FADE       = 0xffffffff,
  };
  
  struct weston_layer {
  	struct weston_compositor *compositor;
  	struct wl_list link; /* weston_compositor::layer_list */
  	enum weston_layer_position position;
  	pixman_box32_t mask;
  	struct weston_layer_entry view_list;
  };
  
  struct weston_plane {
  	struct weston_compositor *compositor;
  	pixman_region32_t damage; /**< in global coords */
  	pixman_region32_t clip;
  	int32_t x, y;
  	struct wl_list link;
  };
  
  struct weston_renderer {
  	int (*read_pixels)(struct weston_output *output,
  			       pixman_format_code_t format, void *pixels,
  			       uint32_t x, uint32_t y,
  			       uint32_t width, uint32_t height);
  	void (*repaint_output)(struct weston_output *output,
  			       pixman_region32_t *output_damage);
  	void (*flush_damage)(struct weston_surface *surface);
  	void (*attach)(struct weston_surface *es, struct weston_buffer *buffer);
  	void (*surface_set_color)(struct weston_surface *surface,
  			       float red, float green,
  			       float blue, float alpha);
  	void (*destroy)(struct weston_compositor *ec);
  
  
  	/** See weston_surface_get_content_size() */
  	void (*surface_get_content_size)(struct weston_surface *surface,
  					 int *width, int *height);
  
  	/** See weston_surface_copy_content() */
  	int (*surface_copy_content)(struct weston_surface *surface,
  				    void *target, size_t size,
  				    int src_x, int src_y,
  				    int width, int height);
  
  	/** See weston_compositor_import_dmabuf() */
  	bool (*import_dmabuf)(struct weston_compositor *ec,
  			      struct linux_dmabuf_buffer *buffer);
  
  	/** On error sets num_formats to zero */
  	void (*query_dmabuf_formats)(struct weston_compositor *ec,
  				int **formats, int *num_formats);
  
  	/** On error sets num_modifiers to zero */
  	void (*query_dmabuf_modifiers)(struct weston_compositor *ec,
  				int format, uint64_t **modifiers,
  				int *num_modifiers);
  
  	/***
  	 *** IAS-specific additions
  	 ***
  	 *** Keep below upstream fields above for ABI-compatibility
  	 ***/
  	void (*repaint_output_base)(struct weston_output *output,
  			pixman_region32_t *output_damage);
  	int (*is_shader_of_type)(struct weston_surface *surface,
  			int type);
  	void (*fill_surf_name)(struct weston_surface *surface, int len,
  			char *surf_name);
  	int (*get_surf_rotation)(struct weston_surface *surface);
  
  	void (*finish_frame)(struct weston_output *output,
  			struct weston_compositor *ec);
  	int (*get_shareable_flag)(struct weston_surface *surface);
  	uint64_t (*get_surf_id)(struct weston_surface *surface);
  };
  
  enum weston_capability {
  	/* backend/renderer supports arbitrary rotation */
  	WESTON_CAP_ROTATION_ANY			= 0x0001,
  
  	/* screencaptures need to be y-flipped */
  	WESTON_CAP_CAPTURE_YFLIP		= 0x0002,
  
  	/* backend/renderer has a separate cursor plane */
  	WESTON_CAP_CURSOR_PLANE			= 0x0004,
  
  	/* backend supports setting arbitrary resolutions */
  	WESTON_CAP_ARBITRARY_MODES		= 0x0008,
  
  	/* renderer supports weston_view_set_mask() clipping */
  	WESTON_CAP_VIEW_CLIP_MASK		= 0x0010,
  };
  
  /* Configuration struct for a backend.
   *
   * This struct carries the configuration for a backend, and it's
   * passed to the backend's init entry point. The backend will
   * likely want to subclass this in order to handle backend specific
   * data.
   *
   * NOTE: Alternate designs were proposed (Feb 2016) for using opaque
   * structures[1] and for section+key/value getter/setters[2].  The rationale
   * for selecting the transparent structure design is based on several
   * assumptions[3] which may require re-evaluating the design choice if they
   * fail to hold.
   *
   * 1: https://lists.freedesktop.org/archives/wayland-devel/2016-February/026989.html
   * 2: https://lists.freedesktop.org/archives/wayland-devel/2016-February/026929.html
   * 3: https://lists.freedesktop.org/archives/wayland-devel/2016-February/027228.html
   */
  struct weston_backend_config {
     /** Major version for the backend-specific config struct
      *
      * This version must match exactly what the backend expects, otherwise
      * the struct is incompatible.
      */
     uint32_t struct_version;
  
     /** Minor version of the backend-specific config struct
      *
      * This must be set to sizeof(struct backend-specific config).
      * If the value here is smaller than what the backend expects, the
      * extra config members will assume their default values.
      *
      * A value greater than what the backend expects is incompatible.
      */
     size_t struct_size;
  };
  
  struct weston_backend {
  	void (*destroy)(struct weston_compositor *compositor);
  
  	/** Begin a repaint sequence
  	 *
  	 * Provides the backend with explicit markers around repaint
  	 * sequences, which may allow the backend to aggregate state
  	 * application. This call will be bracketed by the repaint_flush (on
  	 * success), or repaint_cancel (when any output in the grouping fails
  	 * repaint).
  	 *
  	 * Returns an opaque pointer, which the backend may use as private
  	 * data referring to the repaint cycle.
  	 */
  	void * (*repaint_begin)(struct weston_compositor *compositor);
  
  	/** Cancel a repaint sequence
  	 *
  	 * Cancels a repaint sequence, when an error has occurred during
  	 * one output's repaint; see repaint_begin.
  	 *
  	 * @param repaint_data Data returned by repaint_begin
  	 */
  	void (*repaint_cancel)(struct weston_compositor *compositor,
  			       void *repaint_data);
  
  	/** Conclude a repaint sequence
  	 *
  	 * Called on successful completion of a repaint sequence; see
  	 * repaint_begin.
  	 *
  	 * @param repaint_data Data returned by repaint_begin
  	 */
  	void (*repaint_flush)(struct weston_compositor *compositor,
  			      void *repaint_data);
  
  	/** Allocate a new output
  	 *
  	 * @param compositor The compositor.
  	 * @param name Name for the new output.
  	 *
  	 * Allocates a new output structure that embeds a weston_output,
  	 * initializes it, and returns the pointer to the weston_output
  	 * member.
  	 *
  	 * Must set weston_output members @c destroy, @c enable and @c disable.
  	 */
  	struct weston_output *
  	(*create_output)(struct weston_compositor *compositor,
  			 const char *name);
  };
  
  /** Callback for saving calibration
   *
   * \param compositor The compositor.
   * \param device The physical touch device to save for.
   * \param calibration The new calibration from a client.
   * \return -1 on failure, 0 on success.
   *
   * Failure will prevent taking the new calibration into use.
   */
  typedef int (*weston_touch_calibration_save_func)(
  	struct weston_compositor *compositor,
  	struct weston_touch_device *device,
  	const struct weston_touch_device_matrix *calibration);
  struct weston_touch_calibrator;
  
  struct weston_desktop_xwayland;
  struct weston_desktop_xwayland_interface;
  
  struct weston_compositor {
  	struct wl_signal destroy_signal;
  
  	struct wl_display *wl_display;
  	struct weston_desktop_xwayland *xwayland;
  	const struct weston_desktop_xwayland_interface *xwayland_interface;
  	struct weston_shell_interface shell_interface;
  
  	/* surface signals */
  	struct wl_signal create_surface_signal;
  	struct wl_signal activate_signal;
  	struct wl_signal transform_signal;
  
  	struct wl_signal kill_signal;
  	struct wl_signal idle_signal;
  	struct wl_signal wake_signal;
  
  	struct wl_signal show_input_panel_signal;
  	struct wl_signal hide_input_panel_signal;
  	struct wl_signal update_input_panel_signal;
  
  	struct wl_signal seat_created_signal;
  	struct wl_signal output_created_signal;
  	struct wl_signal output_destroyed_signal;
  	struct wl_signal output_moved_signal;
  	struct wl_signal output_resized_signal; /* callback argument: resized output */
  
  	/* Signal for output changes triggered by configuration from frontend
  	 * or head state changes from backend.
  	 */
  	struct wl_signal output_heads_changed_signal; /* arg: weston_output */
  
  	struct wl_signal session_signal;
  	int session_active;
  
  	struct weston_layer fade_layer;
  	struct weston_layer cursor_layer;
  
  	struct wl_list pending_output_list;
  	struct wl_list output_list;
  	struct wl_list head_list;	/* struct weston_head::compositor_link */
  	struct wl_list seat_list;
  	struct wl_list layer_list;	/* struct weston_layer::link */
  	struct wl_list view_list;	/* struct weston_view::link */
  	struct wl_list plane_list;
  	struct wl_list key_binding_list;
  	struct wl_list modifier_binding_list;
  	struct wl_list button_binding_list;
  	struct wl_list touch_binding_list;
  	struct wl_list axis_binding_list;
  	struct wl_list debug_binding_list;
  
  	uint32_t state;
  	struct wl_event_source *idle_source;
  	uint32_t idle_inhibit;
  	int idle_time;			/* timeout, s */
  	struct wl_event_source *repaint_timer;
  
  	const struct weston_pointer_grab_interface *default_pointer_grab;
  
  	/* Repaint state. */
  	struct weston_plane primary_plane;
  	uint32_t capabilities; /* combination of enum weston_capability */
  
  	struct weston_renderer *renderer;
  
  	pixman_format_code_t read_format;
  
  	struct weston_backend *backend;
  
  	struct weston_launcher *launcher;
  
  	struct wl_list plugin_api_list; /* struct weston_plugin_api::link */
  
  	uint32_t output_id_pool;
  
  	struct xkb_rule_names xkb_names;
  	struct xkb_context *xkb_context;
  	struct weston_xkb_info *xkb_info;
  
  	/* Raw keyboard processing (no libxkbcommon initialization or handling) */
  	int use_xkbcommon;
  
  	int32_t kb_repeat_rate;
  	int32_t kb_repeat_delay;
  
  	bool vt_switching;
  
  	clockid_t presentation_clock;
  	int32_t repaint_msec;
  
  	unsigned int activate_serial;
  
  	struct wl_global *pointer_constraints;
  
  	int exit_code;
  
  	void *user_data;
  	void (*exit)(struct weston_compositor *c);
  
  	/* Whether to let the compositor run without any input device. */
  	bool require_input;
  
  	/* Signal for a backend to inform a frontend about possible changes
  	 * in head status.
  	 */
  	struct wl_signal heads_changed_signal;
  	struct wl_event_source *heads_changed_source;
  
  	/* Touchscreen calibrator support: */
  	enum weston_touch_mode touch_mode;
  
  	struct wl_global *touch_calibration;
  	weston_touch_calibration_save_func touch_calibration_save;
  	struct weston_layer calibrator_layer;
  	struct weston_touch_calibrator *touch_calibrator;
  
  	/***
  	 *** IAS-specific additions
  	 ***
  	 *** Keep below upstream fields above for ABI-compatibility
  	 ***/
  	int normalized_rotation;
  	int damage_outputs_on_init;
  	/*
  	 * This view shouldn't be set unless all input events are meant to go to
  	 * it
  	 */
  	void *input_view;
  };
  
  struct weston_buffer {
  	struct wl_resource *resource;
  	struct wl_signal destroy_signal;
  	struct wl_listener destroy_listener;
  
  	union {
  		struct wl_shm_buffer *shm_buffer;
  		void *legacy_buffer;
  	};
  	int32_t width, height;
  	uint32_t busy_count;
  	int y_inverted;
  	void *priv_buffer;
  };
  
  struct weston_buffer_reference {
  	struct weston_buffer *buffer;
  	struct wl_listener destroy_listener;
  };
  
  struct weston_buffer_viewport {
  	struct {
  		/* wl_surface.set_buffer_transform */
  		uint32_t transform;
  
  		/* wl_surface.set_scaling_factor */
  		int32_t scale;
  
  		/*
  		 * If src_width != wl_fixed_from_int(-1),
  		 * then and only then src_* are used.
  		 */
  		wl_fixed_t src_x, src_y;
  		wl_fixed_t src_width, src_height;
  	} buffer;
  
  	struct {
  		/*
  		 * If width == -1, the size is inferred from the buffer.
  		 */
  		int32_t width, height;
  	} surface;
  
  	int changed;
  };
  
  struct weston_region {
  	struct wl_resource *resource;
  	pixman_region32_t region;
  };
  
  /* Using weston_view transformations
   *
   * To add a transformation to a view, create a struct weston_transform, and
   * add it to the list view->geometry.transformation_list. Whenever you
   * change the list, anything under view->geometry, or anything in the
   * weston_transforms linked into the list, you must call
   * weston_view_geometry_dirty().
   *
   * The order in the list defines the order of transformations. Let the list
   * contain the transformation matrices M1, ..., Mn as head to tail. The
   * transformation is applied to view-local coordinate vector p as
   *    P = Mn * ... * M2 * M1 * p
   * to produce the global coordinate vector P. The total transform
   *    Mn * ... * M2 * M1
   * is cached in view->transform.matrix, and the inverse of it in
   * view->transform.inverse.
   *
   * The list always contains view->transform.position transformation, which
   * is the translation by view->geometry.x and y.
   *
   * If you want to apply a transformation in local coordinates, add your
   * weston_transform to the head of the list. If you want to apply a
   * transformation in global coordinates, add it to the tail of the list.
   *
   * If view->geometry.parent is set, the total transformation of this
   * view will be the parent's total transformation and this transformation
   * combined:
   *    Mparent * Mn * ... * M2 * M1
   */
  
  struct weston_view {
  	struct weston_surface *surface;
  	struct wl_list surface_link;
  	struct wl_signal destroy_signal;
  
  	struct wl_list link;             /* weston_compositor::view_list */
  	struct weston_layer_entry layer_link; /* part of geometry */
  	struct weston_plane *plane;
  
  	/* For weston_layer inheritance from another view */
  	struct weston_view *parent_view;
  
  	unsigned int click_to_activate_serial;
  
  	pixman_region32_t clip;          /* See weston_view_damage_below() */
  	float alpha;                     /* part of geometry, see below */
  
  	void *renderer_state;
  
  	/* Surface geometry state, mutable.
  	 * If you change anything, call weston_surface_geometry_dirty().
  	 * That includes the transformations referenced from the list.
  	 */
  	struct {
  		float x, y; /* surface translation on display */
  
  		/* struct weston_transform */
  		struct wl_list transformation_list;
  
  		/* managed by weston_surface_set_transform_parent() */
  		struct weston_view *parent;
  		struct wl_listener parent_destroy_listener;
  		struct wl_list child_list; /* geometry.parent_link */
  		struct wl_list parent_link;
  
  		/* managed by weston_view_set_mask() */
  		bool scissor_enabled;
  		pixman_region32_t scissor; /* always a simple rect */
  	} geometry;
  
  	/* State derived from geometry state, read-only.
  	 * This is updated by weston_view_update_transform().
  	 */
  	struct {
  		int dirty;
  
  		/* Approximations in global coordinates:
  		 * - boundingbox is guaranteed to include the whole view in
  		 *   the smallest possible single rectangle.
  		 * - opaque is guaranteed to be fully opaque, though not
  		 *   necessarily include all opaque areas.
  		 */
  		pixman_region32_t boundingbox;
  		pixman_region32_t opaque;
  
  		/* matrix and inverse are used only if enabled = 1.
  		 * If enabled = 0, use x, y, width, height directly.
  		 */
  		int enabled;
  		struct weston_matrix matrix;
  		struct weston_matrix inverse;
  
  		struct weston_transform position; /* matrix from x, y */
  	} transform;
  
  	/*
  	 * The primary output for this view.
  	 * Used for picking the output for driving internal animations on the
  	 * view, inheriting the primary output for related views in shells, etc.
  	 */
  	struct weston_output *output;
  	struct wl_listener output_destroy_listener;
  
  	/*
  	 * A more complete representation of all outputs this surface is
  	 * displayed on.
  	 */
  	uint32_t output_mask;
  
  	/* Per-surface Presentation feedback flags, controlled by backend. */
  	uint32_t psf_flags;
  
  	bool is_mapped;
  };
  
  struct weston_surface_state {
  	/* wl_surface.attach */
  	int newly_attached;
  	struct weston_buffer *buffer;
  	struct wl_listener buffer_destroy_listener;
  	int32_t sx;
  	int32_t sy;
  
  	/* wl_surface.damage */
  	pixman_region32_t damage_surface;
  	/* wl_surface.damage_buffer */
  	pixman_region32_t damage_buffer;
  
  	/* wl_surface.set_opaque_region */
  	pixman_region32_t opaque;
  
  	/* wl_surface.set_input_region */
  	pixman_region32_t input;
  
  	/* wl_surface.frame */
  	struct wl_list frame_callback_list;
  
  	/* presentation.feedback */
  	struct wl_list feedback_list;
  
  	/* wl_surface.set_buffer_transform */
  	/* wl_surface.set_scaling_factor */
  	/* wp_viewport.set_source */
  	/* wp_viewport.set_destination */
  	struct weston_buffer_viewport buffer_viewport;
  };
  
  struct weston_surface_activation_data {
  	struct weston_surface *surface;
  	struct weston_seat *seat;
  };
  
  struct weston_pointer_constraint {
  	struct wl_list link;
  
  	struct weston_surface *surface;
  	struct weston_view *view;
  	struct wl_resource *resource;
  	struct weston_pointer_grab grab;
  	struct weston_pointer *pointer;
  	uint32_t lifetime;
  
  	pixman_region32_t region;
  	pixman_region32_t region_pending;
  	bool region_is_pending;
  
  	wl_fixed_t hint_x;
  	wl_fixed_t hint_y;
  	wl_fixed_t hint_x_pending;
  	wl_fixed_t hint_y_pending;
  	bool hint_is_pending;
  
  	struct wl_listener pointer_destroy_listener;
  	struct wl_listener surface_destroy_listener;
  	struct wl_listener surface_commit_listener;
  	struct wl_listener surface_activate_listener;
  };
  
  struct weston_surface {
  	struct wl_resource *resource;
  	struct wl_signal destroy_signal; /* callback argument: this surface */
  	struct weston_compositor *compositor;
  	struct wl_signal commit_signal;
  
  	/** Damage in local coordinates from the client, for tex upload. */
  	pixman_region32_t damage;
  
  	pixman_region32_t opaque;        /* part of geometry, see below */
  	pixman_region32_t input;
  	int32_t width, height;
  	int32_t ref_count;
  
  	/* Not for long-term storage.  This exists for book-keeping while
  	 * iterating over surfaces and views
  	 */
  	bool touched;
  
  	void *renderer_state;
  
  	struct wl_list views;
  
  	/*
  	 * Which output to vsync this surface to.
  	 * Used to determine whether to send or queue frame events, and for
  	 * other client-visible syncing/throttling tied to the output
  	 * repaint cycle.
  	 */
  	struct weston_output *output;
  
  	/*
  	 * A more complete representation of all outputs this surface is
  	 * displayed on.
  	 */
  	uint32_t output_mask;
  
  	struct wl_list frame_callback_list;
  	struct wl_list feedback_list;
  
  	struct weston_buffer_reference buffer_ref;
  	struct weston_buffer_viewport buffer_viewport;
  	int32_t width_from_buffer; /* before applying viewport */
  	int32_t height_from_buffer;
  	bool keep_buffer; /* for backends to prevent early release */
  
  	/* wp_viewport resource for this surface */
  	struct wl_resource *viewport_resource;
  
  	/* All the pending state, that wl_surface.commit will apply. */
  	struct weston_surface_state pending;
  
  	/* Matrices representating of the full transformation between
  	 * buffer and surface coordinates.  These matrices are updated
  	 * using the weston_surface_build_buffer_matrix function. */
  	struct weston_matrix buffer_to_surface_matrix;
  	struct weston_matrix surface_to_buffer_matrix;
  
  	/* Should frame events to this surface be temporarily suspended? */
  	int suspend_frame_events;
  
  	/*
  	 * If non-NULL, this function will be called on
  	 * wl_surface::commit after a new buffer has been set up for
  	 * this surface. The integer params are the sx and sy
  	 * parameters supplied to wl_surface::attach.
  	 */
  	void (*committed)(struct weston_surface *es, int32_t sx, int32_t sy);
  	void *committed_private;
  	int (*get_label)(struct weston_surface *surface, char *buf, size_t len);
  
  	/* Parent's list of its sub-surfaces, weston_subsurface:parent_link.
  	 * Contains also the parent itself as a dummy weston_subsurface,
  	 * if the list is not empty.
  	 */
  	struct wl_list subsurface_list; /* weston_subsurface::parent_link */
  	struct wl_list subsurface_list_pending; /* ...::parent_link_pending */
  
  	/*
  	 * For tracking protocol role assignments. Different roles may
  	 * have the same configure hook, e.g. in shell.c. Configure hook
  	 * may get reset, this will not.
  	 * XXX: map configure functions 1:1 to roles, and never reset it,
  	 * and replace role_name with configure.
  	 */
  	const char *role_name;
  
  	struct weston_timeline_object timeline;
  
  	bool is_mapped;
  
  	/* An list of per seat pointer constraints. */
  	struct wl_list pointer_constraints;
  };
  
  struct weston_subsurface {
  	struct wl_resource *resource;
  
  	/* guaranteed to be valid and non-NULL */
  	struct weston_surface *surface;
  	struct wl_listener surface_destroy_listener;
  
  	/* can be NULL */
  	struct weston_surface *parent;
  	struct wl_listener parent_destroy_listener;
  	struct wl_list parent_link;
  	struct wl_list parent_link_pending;
  
  	struct {
  		int32_t x;
  		int32_t y;
  		int set;
  	} position;
  
  	int has_cached_data;
  	struct weston_surface_state cached;
  	struct weston_buffer_reference cached_buffer_ref;
  
  	/* Sub-surface has been reordered; need to apply damage. */
  	bool reordered;
  
  	int synchronized;
  
  	/* Used for constructing the view tree */
  	struct wl_list unused_views;
  };
  
  struct weston_frame_callback {
  	struct wl_resource *resource;
  	struct wl_list link;
  };
  
  enum weston_key_state_update {
  	STATE_UPDATE_AUTOMATIC,
  	STATE_UPDATE_NONE,
  };
  
  enum weston_activate_flag {
  	WESTON_ACTIVATE_FLAG_NONE = 0,
  	WESTON_ACTIVATE_FLAG_CONFIGURE = 1 << 0,
  	WESTON_ACTIVATE_FLAG_CLICKED = 1 << 1,
  };
  
  void
  weston_version(int *major, int *minor, int *micro);
  
  void
  weston_view_set_output(struct weston_view *view, struct weston_output *output);
  
  void
  weston_view_update_transform(struct weston_view *view);
  
  void
  weston_view_geometry_dirty(struct weston_view *view);
  
  void
  weston_view_to_global_fixed(struct weston_view *view,
  			    wl_fixed_t sx, wl_fixed_t sy,
  			    wl_fixed_t *x, wl_fixed_t *y);
  void
  weston_view_to_global_float(struct weston_view *view,
  			    float sx, float sy, float *x, float *y);
  
  void
  weston_view_from_global_float(struct weston_view *view,
  			      float x, float y, float *vx, float *vy);
  void
  weston_view_from_global(struct weston_view *view,
  			int32_t x, int32_t y, int32_t *vx, int32_t *vy);
  void
  weston_view_from_global_fixed(struct weston_view *view,
  			      wl_fixed_t x, wl_fixed_t y,
  			      wl_fixed_t *vx, wl_fixed_t *vy);
  
  void
  weston_surface_to_buffer_float(struct weston_surface *surface,
  			       float x, float y, float *bx, float *by);
  pixman_box32_t
  weston_surface_to_buffer_rect(struct weston_surface *surface,
  			      pixman_box32_t rect);
  
  void
  weston_surface_to_buffer_region(struct weston_surface *surface,
  				pixman_region32_t *surface_region,
  				pixman_region32_t *buffer_region);
  
  void
  weston_spring_init(struct weston_spring *spring,
  		   double k, double current, double target);
  void
  weston_spring_update(struct weston_spring *spring, const struct timespec *time);
  int
  weston_spring_done(struct weston_spring *spring);
  
  void
  weston_view_activate(struct weston_view *view,
  		     struct weston_seat *seat,
  		     uint32_t flags);
  
  void
  notify_motion(struct weston_seat *seat, const struct timespec *time,
  	      struct weston_pointer_motion_event *event);
  void
  notify_motion_absolute(struct weston_seat *seat, const struct timespec *time,
  		       double x, double y);
  void
  notify_button(struct weston_seat *seat, const struct timespec *time,
  	      int32_t button, enum wl_pointer_button_state state);
  void
  notify_axis(struct weston_seat *seat, const struct timespec *time,
  	    struct weston_pointer_axis_event *event);
  void
  notify_axis_source(struct weston_seat *seat, uint32_t source);
  
  void
  notify_pointer_frame(struct weston_seat *seat);
  
  void
  notify_key(struct weston_seat *seat, const struct timespec *time, uint32_t key,
  	   enum wl_keyboard_key_state state,
  	   enum weston_key_state_update update_state);
  void
  notify_modifiers(struct weston_seat *seat, uint32_t serial);
  
  void
  notify_pointer_focus(struct weston_seat *seat, struct weston_output *output,
  		     double x, double y);
  
  void
  notify_keyboard_focus_in(struct weston_seat *seat, struct wl_array *keys,
  			 enum weston_key_state_update update_state);
  void
  notify_keyboard_focus_out(struct weston_seat *seat);
  
  void
  notify_touch_normalized(struct weston_touch_device *device,
  			const struct timespec *time,
  			int touch_id,
  			double x, double y,
  			const struct weston_point2d_device_normalized *norm,
  			int touch_type);
  
  /** Feed in touch down, motion, and up events, non-calibratable device.
   *
   * @sa notify_touch_cal
   */
  static inline void
  notify_touch(struct weston_touch_device *device, const struct timespec *time,
  	     int touch_id, double x, double y, int touch_type)
  {
  	notify_touch_normalized(device, time, touch_id, x, y, NULL, touch_type);
  }
  
  void
  notify_touch_frame(struct weston_touch_device *device);
  
  void
  notify_touch_cancel(struct weston_touch_device *device);
  
  void
  weston_compositor_set_touch_mode_normal(struct weston_compositor *compositor);
  
  void
  weston_compositor_set_touch_mode_calib(struct weston_compositor *compositor);
  
  void
  touch_calibrator_mode_changed(struct weston_compositor *compositor);
  
  void
  notify_touch_calibrator(struct weston_touch_device *device,
  			const struct timespec *time, int32_t slot,
  			const struct weston_point2d_device_normalized *norm,
  			int touch_type);
  
  void
  notify_touch_calibrator_frame(struct weston_touch_device *device);
  
  void
  notify_touch_calibrator_cancel(struct weston_touch_device *device);
  
  void
  weston_layer_entry_insert(struct weston_layer_entry *list,
  			  struct weston_layer_entry *entry);
  void
  weston_layer_entry_remove(struct weston_layer_entry *entry);
  void
  weston_layer_init(struct weston_layer *layer,
  		  struct weston_compositor *compositor);
  void
  weston_layer_set_position(struct weston_layer *layer,
  			  enum weston_layer_position position);
  void
  weston_layer_unset_position(struct weston_layer *layer);
  
  void
  weston_layer_set_mask(struct weston_layer *layer, int x, int y, int width, int height);
  
  void
  weston_layer_set_mask_infinite(struct weston_layer *layer);
  
  void
  weston_plane_init(struct weston_plane *plane,
  			struct weston_compositor *ec,
  			int32_t x, int32_t y);
  void
  weston_plane_release(struct weston_plane *plane);
  
  void
  weston_compositor_stack_plane(struct weston_compositor *ec,
  			      struct weston_plane *plane,
  			      struct weston_plane *above);
  
  /* An invalid flag in presented_flags to catch logic errors. */
  #define WP_PRESENTATION_FEEDBACK_INVALID (1U << 31)
  
  void
  weston_output_finish_frame(struct weston_output *output,
  			   const struct timespec *stamp,
  			   uint32_t presented_flags);
  void
  weston_output_schedule_repaint(struct weston_output *output);
  void
  weston_output_damage(struct weston_output *output);
  void
  weston_compositor_schedule_repaint(struct weston_compositor *compositor);
  void
  weston_compositor_fade(struct weston_compositor *compositor, float tint);
  void
  weston_compositor_damage_all(struct weston_compositor *compositor);
  void
  weston_compositor_unlock(struct weston_compositor *compositor);
  void
  weston_compositor_wake(struct weston_compositor *compositor);
  void
  weston_compositor_offscreen(struct weston_compositor *compositor);
  void
  weston_compositor_sleep(struct weston_compositor *compositor);
  struct weston_view *
  weston_compositor_pick_view(struct weston_compositor *compositor,
  			    wl_fixed_t x, wl_fixed_t y,
  			    wl_fixed_t *sx, wl_fixed_t *sy);
  
  
  struct weston_binding;
  typedef void (*weston_key_binding_handler_t)(struct weston_keyboard *keyboard,
  					     const struct timespec *time,
  					     uint32_t key,
  					     void *data);
  struct weston_binding *
  weston_compositor_add_key_binding(struct weston_compositor *compositor,
  				  uint32_t key,
  				  enum weston_keyboard_modifier modifier,
  				  weston_key_binding_handler_t binding,
  				  void *data);
  
  typedef void (*weston_modifier_binding_handler_t)(struct weston_keyboard *keyboard,
  					          enum weston_keyboard_modifier modifier,
  					          void *data);
  struct weston_binding *
  weston_compositor_add_modifier_binding(struct weston_compositor *compositor,
  				       enum weston_keyboard_modifier modifier,
  				       weston_modifier_binding_handler_t binding,
  				       void *data);
  
  typedef void (*weston_button_binding_handler_t)(struct weston_pointer *pointer,
  						const struct timespec *time,
  						uint32_t button,
  						void *data);
  struct weston_binding *
  weston_compositor_add_button_binding(struct weston_compositor *compositor,
  				     uint32_t button,
  				     enum weston_keyboard_modifier modifier,
  				     weston_button_binding_handler_t binding,
  				     void *data);
  
  typedef void (*weston_touch_binding_handler_t)(struct weston_touch *touch,
  					       const struct timespec *time,
  					       void *data);
  struct weston_binding *
  weston_compositor_add_touch_binding(struct weston_compositor *compositor,
  				    enum weston_keyboard_modifier modifier,
  				    weston_touch_binding_handler_t binding,
  				    void *data);
  
  typedef void (*weston_axis_binding_handler_t)(struct weston_pointer *pointer,
  					      const struct timespec *time,
  					      struct weston_pointer_axis_event *event,
  					      void *data);
  struct weston_binding *
  weston_compositor_add_axis_binding(struct weston_compositor *compositor,
  			           uint32_t axis,
  			           enum weston_keyboard_modifier modifier,
  			           weston_axis_binding_handler_t binding,
  				   void *data);
  struct weston_binding *
  weston_compositor_add_debug_binding(struct weston_compositor *compositor,
  				    uint32_t key,
  				    weston_key_binding_handler_t binding,
  				    void *data);
  void
  weston_binding_destroy(struct weston_binding *binding);
  
  void
  weston_install_debug_key_binding(struct weston_compositor *compositor,
  				 uint32_t mod);
  
  void
  weston_binding_list_destroy_all(struct wl_list *list);
  
  void
  weston_compositor_run_key_binding(struct weston_compositor *compositor,
  				  struct weston_keyboard *keyboard,
  				  const struct timespec *time,
  				  uint32_t key,
  				  enum wl_keyboard_key_state state);
  
  void
  weston_compositor_run_modifier_binding(struct weston_compositor *compositor,
  				       struct weston_keyboard *keyboard,
  				       enum weston_keyboard_modifier modifier,
  				       enum wl_keyboard_key_state state);
  void
  weston_compositor_run_button_binding(struct weston_compositor *compositor,
  				     struct weston_pointer *pointer,
  				     const struct timespec *time,
  				     uint32_t button,
  				     enum wl_pointer_button_state value);
  void
  weston_compositor_run_touch_binding(struct weston_compositor *compositor,
  				    struct weston_touch *touch,
  				    const struct timespec *time,
  				    int touch_type);
  int
  weston_compositor_run_axis_binding(struct weston_compositor *compositor,
  				   struct weston_pointer *pointer,
  				   const struct timespec *time,
  				   struct weston_pointer_axis_event *event);
  int
  weston_compositor_run_debug_binding(struct weston_compositor *compositor,
  				    struct weston_keyboard *keyboard,
  				    const struct timespec *time,
  				    uint32_t key,
  				    enum wl_keyboard_key_state state);
  
  void
  weston_compositor_set_default_pointer_grab(struct weston_compositor *compositor,
  			const struct weston_pointer_grab_interface *interface);
  
  int
  weston_environment_get_fd(const char *env);
  
  struct weston_surface *
  weston_surface_create(struct weston_compositor *compositor);
  
  struct weston_view *
  weston_view_create(struct weston_surface *surface);
  
  void
  weston_view_destroy(struct weston_view *view);
  
  void
  weston_view_set_position(struct weston_view *view,
  			 float x, float y);
  
  void
  weston_view_set_transform_parent(struct weston_view *view,
  				 struct weston_view *parent);
  
  void
  weston_view_set_mask(struct weston_view *view,
  		     int x, int y, int width, int height);
  
  void
  weston_view_set_mask_infinite(struct weston_view *view);
  
  bool
  weston_view_is_mapped(struct weston_view *view);
  
  void
  weston_view_schedule_repaint(struct weston_view *view);
  
  bool
  weston_surface_is_mapped(struct weston_surface *surface);
  
  void
  weston_surface_set_size(struct weston_surface *surface,
  			int32_t width, int32_t height);
  
  void
  weston_surface_schedule_repaint(struct weston_surface *surface);
  
  void
  weston_surface_damage(struct weston_surface *surface);
  
  void
  weston_view_damage_below(struct weston_view *view);
  
  void
  weston_view_move_to_plane(struct weston_view *view,
  			  struct weston_plane *plane);
  void
  weston_view_unmap(struct weston_view *view);
  
  void
  weston_surface_unmap(struct weston_surface *surface);
  
  struct weston_surface *
  weston_surface_get_main_surface(struct weston_surface *surface);
  
  int
  weston_surface_set_role(struct weston_surface *surface,
  			const char *role_name,
  			struct wl_resource *error_resource,
  			uint32_t error_code);
  const char *
  weston_surface_get_role(struct weston_surface *surface);
  
  void
  weston_surface_set_label_func(struct weston_surface *surface,
  			      int (*desc)(struct weston_surface *,
  					  char *, size_t));
  
  void
  weston_surface_get_content_size(struct weston_surface *surface,
  				int *width, int *height);
  
  struct weston_geometry
  weston_surface_get_bounding_box(struct weston_surface *surface);
  
  int
  weston_surface_copy_content(struct weston_surface *surface,
  			    void *target, size_t size,
  			    int src_x, int src_y,
  			    int width, int height);
  
  struct weston_buffer *
  weston_buffer_from_resource(struct wl_resource *resource);
  
  void
  weston_buffer_reference(struct weston_buffer_reference *ref,
  			struct weston_buffer *buffer);
  
  void
  weston_compositor_get_time(struct timespec *time);
  
  void
  weston_compositor_destroy(struct weston_compositor *ec);
  struct weston_compositor *
  weston_compositor_create(struct wl_display *display, void *user_data);
  
  enum weston_compositor_backend {
  	WESTON_BACKEND_DRM,
  	WESTON_BACKEND_IAS,
  	WESTON_BACKEND_FBDEV,
  	WESTON_BACKEND_HEADLESS,
  	WESTON_BACKEND_RDP,
  	WESTON_BACKEND_WAYLAND,
  	WESTON_BACKEND_X11,
  };
  
  int
  weston_compositor_load_backend(struct weston_compositor *compositor,
  			       enum weston_compositor_backend backend,
  			       struct weston_backend_config *config_base);
  void
  weston_compositor_exit(struct weston_compositor *ec);
  void *
  weston_compositor_get_user_data(struct weston_compositor *compositor);
  int
  weston_compositor_set_presentation_clock(struct weston_compositor *compositor,
  					 clockid_t clk_id);
  int
  weston_compositor_set_presentation_clock_software(
  					struct weston_compositor *compositor);
  void
  weston_compositor_read_presentation_clock(
  			const struct weston_compositor *compositor,
  			struct timespec *ts);
  
  bool
  weston_compositor_import_dmabuf(struct weston_compositor *compositor,
  				struct linux_dmabuf_buffer *buffer);
  
  void
  weston_compositor_shutdown(struct weston_compositor *ec);
  void
  weston_compositor_exit_with_code(struct weston_compositor *compositor,
  				 int exit_code);
  void
  weston_output_init_zoom(struct weston_output *output);
  void
  weston_output_update_zoom(struct weston_output *output);
  void
  weston_output_activate_zoom(struct weston_output *output,
  			    struct weston_seat *seat);
  void
  weston_output_move(struct weston_output *output, int x, int y);
  
  void
  weston_output_add_destroy_listener(struct weston_output *output,
  				   struct wl_listener *listener);
  struct wl_listener *
  weston_output_get_destroy_listener(struct weston_output *output,
  				   wl_notify_func_t notify);
  void
  weston_output_release(struct weston_output *output);
  void
  weston_output_transform_coordinate(struct weston_output *output,
  				   double device_x, double device_y,
  				   double *x, double *y);
  
  void
  weston_seat_init(struct weston_seat *seat, struct weston_compositor *ec,
  		 const char *seat_name);
  void
  weston_seat_init_pointer(struct weston_seat *seat);
  void
  weston_seat_release_pointer(struct weston_seat *seat);
  int
  weston_seat_init_keyboard(struct weston_seat *seat, struct xkb_keymap *keymap);
  void
  weston_seat_release_keyboard(struct weston_seat *seat);
  void
  weston_seat_init_touch(struct weston_seat *seat);
  void
  weston_seat_release_touch(struct weston_seat *seat);
  void
  weston_seat_repick(struct weston_seat *seat);
  void
  weston_seat_update_keymap(struct weston_seat *seat, struct xkb_keymap *keymap);
  
  void
  weston_seat_release(struct weston_seat *seat);
  int
  weston_compositor_set_xkb_rule_names(struct weston_compositor *ec,
  				     struct xkb_rule_names *names);
  void
  weston_compositor_xkb_destroy(struct weston_compositor *ec);
  
  /* String literal of spaces, the same width as the timestamp. */
  #define STAMP_SPACE "               "
  
  typedef int (*log_func_t)(const char *fmt, va_list ap);
  void
  weston_log_set_handler(log_func_t log, log_func_t cont);
  int
  weston_vlog(const char *fmt, va_list ap);
  int
  weston_vlog_continue(const char *fmt, va_list ap);
  int
  weston_log(const char *fmt, ...)
  	__attribute__ ((format (printf, 1, 2)));
  int
  weston_log_continue(const char *fmt, ...)
  	__attribute__ ((format (printf, 1, 2)));
  
  enum {
  	TTY_ENTER_VT,
  	TTY_LEAVE_VT
  };
  
  struct tty *
  tty_create(struct weston_compositor *compositor, int tty_nr);
  
  void
  tty_destroy(struct tty *tty);
  
  void
  tty_reset(struct tty *tty);
  
  int
  tty_activate_vt(struct tty *tty, int vt);
  
  enum weston_screenshooter_outcome {
  	WESTON_SCREENSHOOTER_SUCCESS,
  	WESTON_SCREENSHOOTER_NO_MEMORY,
  	WESTON_SCREENSHOOTER_BAD_BUFFER
  };
  
  typedef void (*weston_screenshooter_done_func_t)(void *data,
  				enum weston_screenshooter_outcome outcome);
  int
  weston_screenshooter_shoot(struct weston_output *output, struct weston_buffer *buffer,
  			   weston_screenshooter_done_func_t done, void *data);
  struct weston_recorder *
  weston_recorder_start(struct weston_output *output, const char *filename);
  void
  weston_recorder_stop(struct weston_recorder *recorder);
  
  struct clipboard *
  clipboard_create(struct weston_seat *seat);
  
  struct weston_view_animation;
  typedef	void (*weston_view_animation_done_func_t)(struct weston_view_animation *animation, void *data);
  
  void
  weston_view_animation_destroy(struct weston_view_animation *animation);
  
  struct weston_view_animation *
  weston_zoom_run(struct weston_view *view, float start, float stop,
  		weston_view_animation_done_func_t done, void *data);
  
  struct weston_view_animation *
  weston_fade_run(struct weston_view *view,
  		float start, float end, float k,
  		weston_view_animation_done_func_t done, void *data);
  
  struct weston_view_animation *
  weston_move_scale_run(struct weston_view *view, int dx, int dy,
  		      float start, float end, bool reverse,
  		      weston_view_animation_done_func_t done, void *data);
  
  struct weston_view_animation *
  weston_move_run(struct weston_view *view, int dx, int dy,
  		float start, float end, bool reverse,
  		weston_view_animation_done_func_t done, void *data);
  
  void
  weston_fade_update(struct weston_view_animation *fade, float target);
  
  struct weston_view_animation *
  weston_stable_fade_run(struct weston_view *front_view, float start,
  		       struct weston_view *back_view, float end,
  		       weston_view_animation_done_func_t done, void *data);
  
  struct weston_view_animation *
  weston_slide_run(struct weston_view *view, float start, float stop,
  		 weston_view_animation_done_func_t done, void *data);
  
  void
  weston_surface_set_color(struct weston_surface *surface,
  			 float red, float green, float blue, float alpha);
  
  void
  weston_surface_destroy(struct weston_surface *surface);
  
  int
  weston_output_mode_set_native(struct weston_output *output,
  			      struct weston_mode *mode,
  			      int32_t scale);
  int
  weston_output_mode_switch_to_temporary(struct weston_output *output,
  				       struct weston_mode *mode,
  				       int32_t scale);
  int
  weston_output_mode_switch_to_native(struct weston_output *output);
  
  int
  noop_renderer_init(struct weston_compositor *ec);
  
  int
  weston_input_init(struct weston_compositor *compositor);
  
  int
  weston_backend_init(struct weston_compositor *c,
  		    struct weston_backend_config *config_base);
  int
  weston_module_init(struct weston_compositor *compositor);
  
  void
  weston_transformed_coord(int width, int height,
  			 enum wl_output_transform transform,
  			 int32_t scale,
  			 float sx, float sy, float *bx, float *by);
  pixman_box32_t
  weston_transformed_rect(int width, int height,
  			enum wl_output_transform transform,
  			int32_t scale,
  			pixman_box32_t rect);
  void
  weston_matrix_transform_region(pixman_region32_t *dest,
                                 struct weston_matrix *matrix,
                                 pixman_region32_t *src);
  void
  weston_transformed_region(int width, int height,
  			  enum wl_output_transform transform,
  			  int32_t scale,
  			  pixman_region32_t *src, pixman_region32_t *dest);
  
  void *
  weston_load_module(const char *name, const char *entrypoint);
  
  size_t
  weston_module_path_from_env(const char *name, char *path, size_t path_len);
  
  int
  weston_parse_transform(const char *transform, uint32_t *out);
  
  const char *
  weston_transform_to_string(uint32_t output_transform);
  
  struct weston_keyboard *
  weston_seat_get_keyboard(struct weston_seat *seat);
  
  struct weston_pointer *
  weston_seat_get_pointer(struct weston_seat *seat);
  
  struct weston_touch *
  weston_seat_get_touch(struct weston_seat *seat);
  
  void
  weston_seat_set_keyboard_focus(struct weston_seat *seat,
  			       struct weston_surface *surface);
  
  void
  weston_keyboard_send_keymap(struct weston_keyboard *kbd,
  			    struct wl_resource *resource);
  
  int
  weston_compositor_load_xwayland(struct weston_compositor *compositor);
  
  void
  weston_head_init(struct weston_head *head, const char *name);
  
  void
  weston_head_release(struct weston_head *head);
  
  void
  weston_compositor_add_head(struct weston_compositor *compositor,
  			   struct weston_head *head);
  
  void
  weston_head_set_monitor_strings(struct weston_head *head,
  				const char *make,
  				const char *model,
  				const char *serialno);
  
  void
  weston_head_set_physical_size(struct weston_head *head,
  			      int32_t mm_width, int32_t mm_height);
  
  void
  weston_head_set_subpixel(struct weston_head *head,
  			 enum wl_output_subpixel sp);
  
  void
  weston_head_set_connection_status(struct weston_head *head, bool connected);
  
  void
  weston_head_set_internal(struct weston_head *head);
  
  bool
  weston_head_is_connected(struct weston_head *head);
  
  bool
  weston_head_is_enabled(struct weston_head *head);
  
  bool
  weston_head_is_device_changed(struct weston_head *head);
  
  void
  weston_head_reset_device_changed(struct weston_head *head);
  
  const char *
  weston_head_get_name(struct weston_head *head);
  
  struct weston_output *
  weston_head_get_output(struct weston_head *head);
  
  void
  weston_head_detach(struct weston_head *head);
  
  void
  weston_head_add_destroy_listener(struct weston_head *head,
  				 struct wl_listener *listener);
  
  struct wl_listener *
  weston_head_get_destroy_listener(struct weston_head *head,
  				 wl_notify_func_t notify);
  
  struct weston_head *
  weston_compositor_iterate_heads(struct weston_compositor *compositor,
  				struct weston_head *iter);
  
  void
  weston_compositor_add_heads_changed_listener(struct weston_compositor *compositor,
  					     struct wl_listener *listener);
  
  struct weston_output *
  weston_compositor_find_output_by_name(struct weston_compositor *compositor,
  				      const char *name);
  
  struct weston_output *
  weston_compositor_create_output(struct weston_compositor *compositor,
  				const char *name);
  
  struct weston_output *
  weston_compositor_create_output_with_head(struct weston_compositor *compositor,
  					  struct weston_head *head);
  
  void
  weston_output_destroy(struct weston_output *output);
  
  int
  weston_output_attach_head(struct weston_output *output,
  			  struct weston_head *head);
  
  struct weston_head *
  weston_output_iterate_heads(struct weston_output *output,
  			    struct weston_head *iter);
  
  void
  weston_output_set_scale(struct weston_output *output,
  			int32_t scale);
  
  void
  weston_output_set_transform(struct weston_output *output,
  			    uint32_t transform);
  
  void
  weston_output_init(struct weston_output *output,
  		   struct weston_compositor *compositor,
  		   const char *name);
  
  void
  weston_compositor_add_pending_output(struct weston_output *output,
  				     struct weston_compositor *compositor);
  
  int
  weston_output_enable(struct weston_output *output);
  
  void
  weston_output_disable(struct weston_output *output);
  
  void
  weston_compositor_flush_heads_changed(struct weston_compositor *compositor);
  
  struct weston_head *
  weston_head_from_resource(struct wl_resource *resource);
  
  struct weston_head *
  weston_output_get_first_head(struct weston_output *output);
  
  int
  weston_compositor_enable_touch_calibrator(struct weston_compositor *compositor,
  				weston_touch_calibration_save_func save);
  
  #ifdef  __cplusplus
  }
  #endif
  
  #endif
  