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/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef WAYLAND_CLIENT_H
#define WAYLAND_CLIENT_H
#include "wayland-util.h"
#include "wayland-version.h"
#ifdef __cplusplus
extern "C" {
#endif
/** \class wl_proxy
*
* \brief Represents a protocol object on the client side.
*
* A wl_proxy acts as a client side proxy to an object existing in the
* compositor. The proxy is responsible for converting requests made by the
* clients with \ref wl_proxy_marshal() into Wayland's wire format. Events
* coming from the compositor are also handled by the proxy, which will in
* turn call the handler set with \ref wl_proxy_add_listener().
*
* \note With the exception of function \ref wl_proxy_set_queue(), functions
* accessing a \ref wl_proxy are not normally used by client code. Clients
* should normally use the higher level interface generated by the scanner to
* interact with compositor objects.
*
*/
struct wl_proxy;
/** \class wl_display
*
* \brief Represents a connection to the compositor and acts as a proxy to
* the wl_display singleton object.
*
* A \ref wl_display object represents a client connection to a Wayland
* compositor. It is created with either \ref wl_display_connect() or
* \ref wl_display_connect_to_fd(). A connection is terminated using
* \ref wl_display_disconnect().
*
* A \ref wl_display is also used as the \ref wl_proxy for the \ref wl_display
* singleton object on the compositor side.
*
* A \ref wl_display object handles all the data sent from and to the
* compositor. When a \ref wl_proxy marshals a request, it will write its wire
* representation to the display's write buffer. The data is sent to the
* compositor when the client calls \ref wl_display_flush().
*
* Incoming data is handled in two steps: queueing and dispatching. In the
* queue step, the data coming from the display fd is interpreted and
* added to a queue. On the dispatch step, the handler for the incoming
* event set by the client on the corresponding \ref wl_proxy is called.
*
* A \ref wl_display has at least one event queue, called the <em>main
* queue</em>. Clients can create additional event queues with \ref
* wl_display_create_queue() and assign \ref wl_proxy's to it. Events
* occurring in a particular proxy are always queued in its assigned queue.
* A client can ensure that a certain assumption, such as holding a lock
* or running from a given thread, is true when a proxy event handler is
* called by assigning that proxy to an event queue and making sure that
* this queue is only dispatched when the assumption holds.
*
* The main queue is dispatched by calling \ref wl_display_dispatch().
* This will dispatch any events queued on the main queue and attempt
* to read from the display fd if its empty. Events read are then queued
* on the appropriate queues according to the proxy assignment. Calling
* that function makes the calling thread the <em>main thread</em>.
*
* A user created queue is dispatched with \ref wl_display_dispatch_queue().
* If there are no events to dispatch this function will block. If this
* is called by the main thread, this will attempt to read data from the
* display fd and queue any events on the appropriate queues. If calling
* from any other thread, the function will block until the main thread
* queues an event on the queue being dispatched.
*
* A real world example of event queue usage is Mesa's implementation of
* eglSwapBuffers() for the Wayland platform. This function might need
* to block until a frame callback is received, but dispatching the main
* queue could cause an event handler on the client to start drawing
* again. This problem is solved using another event queue, so that only
* the events handled by the EGL code are dispatched during the block.
*
* This creates a problem where the main thread dispatches a non-main
* queue, reading all the data from the display fd. If the application
* would call \em poll(2) after that it would block, even though there
* might be events queued on the main queue. Those events should be
* dispatched with \ref wl_display_dispatch_pending() before
* flushing and blocking.
*/
struct wl_display;
/** \class wl_event_queue
*
* \brief A queue for \ref wl_proxy object events.
*
* Event queues allows the events on a display to be handled in a thread-safe
* manner. See \ref wl_display for details.
*
*/
struct wl_event_queue;
void wl_event_queue_destroy(struct wl_event_queue *queue);
void wl_proxy_marshal(struct wl_proxy *p, uint32_t opcode, ...);
void wl_proxy_marshal_array(struct wl_proxy *p, uint32_t opcode,
union wl_argument *args);
struct wl_proxy *wl_proxy_create(struct wl_proxy *factory,
const struct wl_interface *interface);
void wl_proxy_destroy(struct wl_proxy *proxy);
int wl_proxy_add_listener(struct wl_proxy *proxy,
void (**implementation)(void), void *data);
const void *wl_proxy_get_listener(struct wl_proxy *proxy);
int wl_proxy_add_dispatcher(struct wl_proxy *proxy,
wl_dispatcher_func_t dispatcher_func,
const void * dispatcher_data, void *data);
void wl_proxy_set_user_data(struct wl_proxy *proxy, void *user_data);
void *wl_proxy_get_user_data(struct wl_proxy *proxy);
uint32_t wl_proxy_get_id(struct wl_proxy *proxy);
const char *wl_proxy_get_class(struct wl_proxy *proxy);
void wl_proxy_set_queue(struct wl_proxy *proxy, struct wl_event_queue *queue);
#include "wayland-client-protocol.h"
struct wl_display *wl_display_connect(const char *name);
struct wl_display *wl_display_connect_to_fd(int fd);
void wl_display_disconnect(struct wl_display *display);
int wl_display_get_fd(struct wl_display *display);
int wl_display_dispatch(struct wl_display *display);
int wl_display_dispatch_queue(struct wl_display *display,
struct wl_event_queue *queue);
int wl_display_dispatch_queue_pending(struct wl_display *display,
struct wl_event_queue *queue);
int wl_display_dispatch_pending(struct wl_display *display);
int wl_display_get_error(struct wl_display *display);
int wl_display_flush(struct wl_display *display);
int wl_display_roundtrip(struct wl_display *display);
struct wl_event_queue *wl_display_create_queue(struct wl_display *display);
int wl_display_prepare_read_queue(struct wl_display *display,
struct wl_event_queue *queue);
int wl_display_prepare_read(struct wl_display *display);
void wl_display_cancel_read(struct wl_display *display);
int wl_display_read_events(struct wl_display *display);
void wl_log_set_handler_client(wl_log_func_t handler);
#ifdef __cplusplus
}
#endif
#endif
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