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Diffstat (limited to 'src/glx/mini/miniglx_events.c')
| -rw-r--r-- | src/glx/mini/miniglx_events.c | 962 |
1 files changed, 962 insertions, 0 deletions
diff --git a/src/glx/mini/miniglx_events.c b/src/glx/mini/miniglx_events.c new file mode 100644 index 0000000000..d367dba395 --- /dev/null +++ b/src/glx/mini/miniglx_events.c @@ -0,0 +1,962 @@ +/** + * \file miniglx_events.c + * \brief Mini GLX client/server communication functions. + * \author Keith Whitwell + * + * The Mini GLX interface is a subset of the GLX interface, plus a + * minimal set of Xlib functions. This file adds interfaces to + * arbitrate a single cliprect between multiple direct rendering + * clients. + * + * A fairly complete client/server non-blocking communication + * mechanism. Probably overkill given that none of our messages + * currently exceed 1 byte in length and take place over the + * relatively benign channel provided by a Unix domain socket. + */ + +/* + * Mesa 3-D graphics library + * Version: 5.0 + * + * Copyright (C) 1999-2003 Brian Paul All Rights Reserved. + * + * 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 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 + * BRIAN PAUL 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. + */ + +/* $Id: miniglx_events.c,v 1.1 2003/08/22 20:11:43 brianp Exp $ */ + + +#include <assert.h> +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <dlfcn.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/stat.h> + +#include <linux/kd.h> +#include <linux/vt.h> + +#include "miniglxP.h" + +#include "xf86drm.h" +#include "sarea.h" + +#define MINIGLX_FIFO_NAME "/tmp/miniglx.fifo" + +/** Character messages. */ +enum msgs { + _CanIHaveFocus, + _IDontWantFocus, + _YouveGotFocus, + _YouveLostFocus, + _RepaintPlease, +}; + +/** + * \brief Allocate an XEvent structure on the event queue. + * + * \param dpy the display handle. + * + * \return Pointer to the queued event structure or NULL on failure. + * + * \internal + * If there is space on the XEvent queue, return a pointer + * to the next free event and increment the eventqueue tail value. + * Otherwise return null. + */ +static XEvent *queue_event( Display *dpy ) +{ + int incr = (dpy->eventqueue.tail + 1) & MINIGLX_EVENT_QUEUE_MASK; + if (incr == dpy->eventqueue.head) { + return 0; + } + else { + XEvent *ev = &dpy->eventqueue.queue[dpy->eventqueue.tail]; + dpy->eventqueue.tail = incr; + return ev; + } +} + +/** + * \brief Dequeue an XEvent and copy it into provided storage. + * + * \param dpy the display handle. + * \param event_return pointer to copy the queued event to. + * + * \return True or False depending on success. + * + * \internal + * If there is a queued XEvent on the queue, copy it to the provided + * pointer and increment the eventqueue head value. Otherwise return + * null. + */ +static int dequeue_event( Display *dpy, XEvent *event_return ) +{ + if (dpy->eventqueue.tail == dpy->eventqueue.head) { + return False; + } + else { + *event_return = dpy->eventqueue.queue[dpy->eventqueue.head]; + dpy->eventqueue.head += 1; + dpy->eventqueue.head &= MINIGLX_EVENT_QUEUE_MASK; + return True; + } +} + +/** + * \brief Shutdown a socket connection. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * + * \internal + * Shutdown and close the file descriptor. If this is the special + * connection in fd[0], issue an error message and exit - there's been + * some sort of failure somewhere. Otherwise, let the application + * know about whats happened by issuing a DestroyNotify event. + */ +static void shut_fd( Display *dpy, int i ) +{ + if (dpy->fd[i].fd < 0) + return; + + shutdown (dpy->fd[i].fd, SHUT_RDWR); + close (dpy->fd[i].fd); + dpy->fd[i].fd = -1; + dpy->fd[i].readbuf_count = 0; + dpy->fd[i].writebuf_count = 0; + + if (i == 0) { + fprintf(stderr, "server connection lost\n"); + exit(1); + } + else { + /* Pass this to the application as a DestroyNotify event. + */ + XEvent *er = queue_event(dpy); + if (!er) return; + er->xdestroywindow.type = DestroyNotify; + er->xdestroywindow.serial = 0; + er->xdestroywindow.send_event = 0; + er->xdestroywindow.display = dpy; + er->xdestroywindow.window = (Window)i; + } +} + +/** + * \brief Send a message to a socket connection. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * \param msg the message to send. + * \param sz the size of the message + * + * \internal + * Copy the message to the write buffer for the nominated connection. + * This will be actually sent to that file descriptor from + * __miniglx_Select(). + */ +static int send_msg( Display *dpy, int i, + const void *msg, size_t sz ) +{ + int cnt = dpy->fd[i].writebuf_count; + if (MINIGLX_BUF_SIZE - cnt < sz) { + fprintf(stderr, "client %d: writebuf overflow\n", i); + return False; + } + + memcpy( dpy->fd[i].writebuf + cnt, msg, sz ); cnt += sz; + dpy->fd[i].writebuf_count = cnt; + return True; +} + +/** + * \brief Send a message to a socket connection. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * \param msg the message to send. + * + * \internal + * Use send_msg() to send a one-byte message to a socket. + */ +static int send_char_msg( Display *dpy, int i, char msg ) +{ + return send_msg( dpy, i, &msg, sizeof(char)); +} + + +/** + * \brief Block and receive a message from a socket connection. + * + * \param dpy the display handle. + * \param connection the index in dpy->fd of the socket connection. + * \param msg storage for the received message. + * \param msg_size the number of bytes to read. + * + * \internal + * Block and read from the connection's file descriptor + * until msg_size bytes have been received. + * + * Only called from welcome_message_part(). + */ +static int blocking_read( Display *dpy, int connection, + char *msg, size_t msg_size ) +{ + int i, r; + + for (i = 0 ; i < msg_size ; i += r) { + r = read(dpy->fd[connection].fd, msg + i, msg_size - i); + if (r < 1) { + fprintf(stderr, "blocking_read: %d %s\n", r, strerror(errno)); + shut_fd(dpy,connection); + return False; + } + } + + return True; +} + +/** + * \brief Send/receive a part of the welcome message. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * \param msg storage for the sent/received message. + * \param sz the number of bytes to write/read. + * + * \return True on success, or False on failure. + * + * This function is called by welcome_message_part(), to either send or receive + * (via blocking_read()) part of the welcome message, according to whether + * Display::IsClient is set. + * + * Each part of the welcome message on the wire consists of a count and then the + * actual message data with that number of bytes. + */ +static int welcome_message_part( Display *dpy, int i, void **msg, int sz ) +{ + if (dpy->IsClient) { + int sz; + if (!blocking_read( dpy, i, (char *)&sz, sizeof(sz))) return False; + if (!*msg) *msg = malloc(sz); + if (!*msg) return False; + if (!blocking_read( dpy, i, *msg, sz )) return False; + } + else { + if (!send_msg( dpy, i, &sz, sizeof(sz))) return False; + if (!send_msg( dpy, i, *msg, sz )) return False; + } + + return True; +} + +/** + * \brief Send/receive the welcome message. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * + * \return True on success, or False on failure. + * + * Using welcome_message_part(), sends/receives the client ID, the client + * configuration details in DRIDriverContext::shared, and the driver private + * message in DRIDriverContext::driverClientMsg. + */ +static int welcome_message( Display *dpy, int i ) +{ + void *tmp = &dpy->driverContext.shared; + int *clientid = dpy->IsClient ? &dpy->clientID : &i; + + if (!welcome_message_part( dpy, i, (void **)&clientid, sizeof(*clientid))) + return False; + + if (!welcome_message_part( dpy, i, &tmp, sizeof(dpy->driverContext.shared))) + return False; + + if (!welcome_message_part( dpy, i, + (void **)&dpy->driverContext.driverClientMsg, + dpy->driverContext.driverClientMsgSize )) + return False; + + return True; +} + + +/** + * \brief Handle a new client connection. + * + * \param dpy the display handle. + * + * \return True on success or False on failure. + * + * Accepts the connection, sets it in non-blocking operation, and finds a free + * slot in Display::fd for it. + */ +static int handle_new_client( Display *dpy ) +{ + struct sockaddr_un client_address; + unsigned int l = sizeof(client_address); + int r, i; + + r = accept(dpy->fd[0].fd, (struct sockaddr *) &client_address, &l); + if (r < 0) { + perror ("accept()"); + shut_fd(dpy,0); + return False; + } + + if (fcntl(r, F_SETFL, O_NONBLOCK) != 0) { + perror("fcntl"); + close(r); + return False; + } + + + /* Some rough & ready adaption of the XEvent semantics. + */ + for (i = 1 ; i < dpy->nrFds ; i++) { + if (dpy->fd[i].fd < 0) { + XEvent *er = queue_event(dpy); + if (!er) { + close(r); + return False; + } + + dpy->fd[i].fd = r; + er->xcreatewindow.type = CreateNotify; + er->xcreatewindow.serial = 0; + er->xcreatewindow.send_event = 0; + er->xcreatewindow.display = dpy; + er->xcreatewindow.window = (Window)i; /* fd slot == window, now? */ + + /* Send the driver client message - this is expected as the + * first message on a new connection. The recpient already + * knows the size of the message. + */ + welcome_message( dpy, i ); + return True; + } + } + + + fprintf(stderr, "[miniglx] %s: Max nr clients exceeded\n", __FUNCTION__); + close(r); + return False; +} + +/** + * This routine "puffs out" the very basic communications between + * client and server to full-sized X Events that can be handled by the + * application. + * + * \param dpy the display handle. + * \param i the index in dpy->fd of the socket connection. + * + * \return True on success or False on failure. + * + * \internal + * Interprets the message (see msg) into a XEvent and advances the file FIFO + * buffer. + */ +static int +handle_fifo_read( Display *dpy, int i ) +{ + while (dpy->fd[i].readbuf_count) { + char id = dpy->fd[i].readbuf[0]; + XEvent *er; + int count = 1; + + if (dpy->IsClient) { + switch (id) { + /* The server has called XMapWindow on a client window */ + case _YouveGotFocus: + er = queue_event(dpy); + if (!er) return False; + er->xmap.type = MapNotify; + er->xmap.serial = 0; + er->xmap.send_event = False; + er->xmap.display = dpy; + er->xmap.event = dpy->TheWindow; + er->xmap.window = dpy->TheWindow; + er->xmap.override_redirect = False; + if (dpy->driver->notifyFocus) + dpy->driver->notifyFocus( 1 ); + break; + + /* The server has called XMapWindow on a client window */ + case _RepaintPlease: + er = queue_event(dpy); + if (!er) return False; + er->xexpose.type = Expose; + er->xexpose.serial = 0; + er->xexpose.send_event = False; + er->xexpose.display = dpy; + er->xexpose.window = dpy->TheWindow; + if (dpy->rotateMode) { + er->xexpose.x = dpy->TheWindow->y; + er->xexpose.y = dpy->TheWindow->x; + er->xexpose.width = dpy->TheWindow->h; + er->xexpose.height = dpy->TheWindow->w; + } + else { + er->xexpose.x = dpy->TheWindow->x; + er->xexpose.y = dpy->TheWindow->y; + er->xexpose.width = dpy->TheWindow->w; + er->xexpose.height = dpy->TheWindow->h; + } + er->xexpose.count = 0; + break; + + /* The server has called 'XUnmapWindow' on a client + * window. + */ + case _YouveLostFocus: + er = queue_event(dpy); + if (!er) return False; + er->xunmap.type = UnmapNotify; + er->xunmap.serial = 0; + er->xunmap.send_event = False; + er->xunmap.display = dpy; + er->xunmap.event = dpy->TheWindow; + er->xunmap.window = dpy->TheWindow; + er->xunmap.from_configure = False; + if (dpy->driver->notifyFocus) + dpy->driver->notifyFocus( 0 ); + break; + + default: + fprintf(stderr, "Client received unhandled message type %d\n", id); + shut_fd(dpy, i); /* Actually shuts down the client */ + return False; + } + } + else { + switch (id) { + /* Lets the server know that the client is ready to render + * (having called 'XMapWindow' locally). + */ + case _CanIHaveFocus: + er = queue_event(dpy); + if (!er) return False; + er->xmaprequest.type = MapRequest; + er->xmaprequest.serial = 0; + er->xmaprequest.send_event = False; + er->xmaprequest.display = dpy; + er->xmaprequest.parent = 0; + er->xmaprequest.window = (Window)i; + break; + + /* Both _YouveLostFocus and _IDontWantFocus generate unmap + * events. The idea is that _YouveLostFocus lets the client + * know that it has had focus revoked by the server, whereas + * _IDontWantFocus lets the server know that the client has + * unmapped its own window. + */ + case _IDontWantFocus: + er = queue_event(dpy); + if (!er) return False; + er->xunmap.type = UnmapNotify; + er->xunmap.serial = 0; + er->xunmap.send_event = False; + er->xunmap.display = dpy; + er->xunmap.event = (Window)i; + er->xunmap.window = (Window)i; + er->xunmap.from_configure = False; + break; + + default: + fprintf(stderr, "Server received unhandled message type %d\n", id); + shut_fd(dpy, i); /* Generates DestroyNotify event */ + return False; + } + } + + dpy->fd[i].readbuf_count -= count; + + if (dpy->fd[i].readbuf_count) { + memmove(dpy->fd[i].readbuf, + dpy->fd[i].readbuf + count, + dpy->fd[i].readbuf_count); + } + } + + return True; +} + +/** + * Handle a VT signal + * + * \param dpy display handle. + * + * The VT switches is detected by comparing Display::haveVT and + * Display::hwActive. When loosing the VT the hardware lock is acquired, the + * hardware is shutdown via a call to DRIDriverRec::shutdownHardware(), and the + * VT released. When acquiring the VT back the hardware state is restored via a + * call to DRIDriverRec::restoreHardware() and the hardware lock released. + */ +static void __driHandleVtSignals( Display *dpy ) +{ + dpy->vtSignalFlag = 0; + + fprintf(stderr, "%s: haveVT %d hwActive %d\n", __FUNCTION__, + dpy->haveVT, dpy->hwActive); + + if (!dpy->haveVT && dpy->hwActive) { + /* Need to get lock and shutdown hardware */ + DRM_LIGHT_LOCK( dpy->driverContext.drmFD, + dpy->driverContext.pSAREA, + dpy->driverContext.serverContext ); + dpy->driver->shutdownHardware( &dpy->driverContext ); + + /* Can now give up control of the VT */ + ioctl( dpy->ConsoleFD, VT_RELDISP, 1 ); + dpy->hwActive = 0; + } + else if (dpy->haveVT && !dpy->hwActive) { + /* Get VT (wait??) */ + ioctl( dpy->ConsoleFD, VT_RELDISP, VT_ACTIVATE ); + + /* restore HW state, release lock */ + dpy->driver->restoreHardware( &dpy->driverContext ); + DRM_UNLOCK( dpy->driverContext.drmFD, + dpy->driverContext.pSAREA, + dpy->driverContext.serverContext ); + dpy->hwActive = 1; + } +} + + +#undef max +#define max(x,y) ((x) > (y) ? (x) : (y)) + +/** + * Logic for the select() call. + * + * \param dpy display handle. + * \param n highest fd in any set plus one. + * \param rfds fd set to be watched for reading, or NULL to create one. + * \param wfds fd set to be watched for writing, or NULL to create one. + * \param xfds fd set to be watched for exceptions or error, or NULL to create one. + * \param tv timeout value, or NULL for no timeout. + * + * \return number of file descriptors contained in the sets, or a negative number on failure. + * + * \note + * This all looks pretty complex, but is necessary especially on the + * server side to prevent a poorly-behaved client from causing the + * server to block in a read or write and hence not service the other + * clients. + * + * \sa + * See select_tut in the Linux manual pages for more discussion. + * + * \internal + * Creates and initializes the file descriptor sets by inspecting Display::fd + * if these aren't passed in the function call. Calls select() and fulfill the + * demands by trying to fill MiniGLXConnection::readbuf and draining + * MiniGLXConnection::writebuf. + * The server fd[0] is handled specially for new connections, by calling + * handle_new_client(). + * + */ +int +__miniglx_Select( Display *dpy, int n, fd_set *rfds, fd_set *wfds, fd_set *xfds, + struct timeval *tv ) +{ + int i; + int retval; + fd_set my_rfds, my_wfds; + struct timeval my_tv; + + if (!rfds) { + rfds = &my_rfds; + FD_ZERO(rfds); + } + + if (!wfds) { + wfds = &my_wfds; + FD_ZERO(wfds); + } + + /* Don't block if there are events queued. Review this if the + * flush in XMapWindow is changed to blocking. (Test case: + * miniglxtest). + */ + if (dpy->eventqueue.head != dpy->eventqueue.tail) { + my_tv.tv_sec = my_tv.tv_usec = 0; + tv = &my_tv; + } + + for (i = 0 ; i < dpy->nrFds; i++) { + if (dpy->fd[i].fd < 0) + continue; + + if (dpy->fd[i].writebuf_count) + FD_SET(dpy->fd[i].fd, wfds); + + if (dpy->fd[i].readbuf_count < MINIGLX_BUF_SIZE) + FD_SET(dpy->fd[i].fd, rfds); + + n = max(n, dpy->fd[i].fd + 1); + } + + if (dpy->vtSignalFlag) + __driHandleVtSignals( dpy ); + + retval = select( n, rfds, wfds, xfds, tv ); + + if (dpy->vtSignalFlag) { + int tmp = errno; + __driHandleVtSignals( dpy ); + errno = tmp; + } + + if (retval < 0) { + FD_ZERO(rfds); + FD_ZERO(wfds); + return retval; + } + + /* Handle server fd[0] specially on the server - accept new client + * connections. + */ + if (!dpy->IsClient) { + if (FD_ISSET(dpy->fd[0].fd, rfds)) { + FD_CLR(dpy->fd[0].fd, rfds); + handle_new_client( dpy ); + } + } + + /* Otherwise, try and fill readbuffer and drain writebuffer: + */ + for (i = 0 ; i < dpy->nrFds ; i++) { + if (dpy->fd[i].fd < 0) + continue; + + /* If there aren't any event slots left, don't examine + * any more file events. This will prevent lost events. + */ + if (dpy->eventqueue.head == + ((dpy->eventqueue.tail + 1) & MINIGLX_EVENT_QUEUE_MASK)) { + fprintf(stderr, "leaving event loop as event queue is full\n"); + return retval; + } + + if (FD_ISSET(dpy->fd[i].fd, wfds)) { + int r = write(dpy->fd[i].fd, + dpy->fd[i].writebuf, + dpy->fd[i].writebuf_count); + + if (r < 1) + shut_fd(dpy,i); + else { + dpy->fd[i].writebuf_count -= r; + if (dpy->fd[i].writebuf_count) { + memmove(dpy->fd[i].writebuf, + dpy->fd[i].writebuf + r, + dpy->fd[i].writebuf_count); + } + } + } + + if (FD_ISSET(dpy->fd[i].fd, rfds)) { + int r = read(dpy->fd[i].fd, + dpy->fd[i].readbuf + dpy->fd[i].readbuf_count, + MINIGLX_BUF_SIZE - dpy->fd[i].readbuf_count); + + if (r < 1) + shut_fd(dpy,i); + else { + dpy->fd[i].readbuf_count += r; + + handle_fifo_read( dpy, i ); + } + } + } + + return retval; +} + +/** + * \brief Handle socket events. + * + * \param dpy the display handle. + * \param nonblock whether to return immediately or wait for an event. + * + * \return True on success, False on failure. Aborts on critical error. + * + * \internal + * This function is the select() main loop. + */ +static int handle_fd_events( Display *dpy, int nonblock ) +{ + while (1) { + struct timeval tv = {0, 0}; + int r = __miniglx_Select( dpy, 0, 0, 0, 0, nonblock ? &tv : 0 ); + if (r >= 0) + return True; + if (errno == EINTR || errno == EAGAIN) + continue; + perror ("select()"); + exit (1); + } +} + +/** + * Initializes the connections. + * + * \param dpy the display handle. + * + * \return True on success or False on failure. + * + * Allocates and initializes the Display::fd array and create a Unix socket on + * the first entry. For a server binds the socket to a filename and listen for + * connections. For a client connects to the server and waits for a welcome + * message. Sets the socket in nonblocking mode. + */ +int __miniglx_open_connections( Display *dpy ) +{ + struct sockaddr_un sa; + int i; + + dpy->nrFds = dpy->IsClient ? 1 : MINIGLX_MAX_SERVER_FDS; + dpy->fd = calloc(1, dpy->nrFds * sizeof(struct MiniGLXConnection)); + if (!dpy->fd) + return False; + + for (i = 0 ; i < dpy->nrFds ; i++) + dpy->fd[i].fd = -1; + + if (!dpy->IsClient) { + if (unlink(MINIGLX_FIFO_NAME) != 0 && errno != ENOENT) { + perror("unlink " MINIGLX_FIFO_NAME); + return False; + } + + } + + /* Create a Unix socket -- Note this is *not* a network connection! + */ + dpy->fd[0].fd = socket(PF_UNIX, SOCK_STREAM, 0); + if (dpy->fd[0].fd < 0) { + perror("socket " MINIGLX_FIFO_NAME); + return False; + } + + memset(&sa, 0, sizeof(sa)); + sa.sun_family = AF_UNIX; + strcpy(sa.sun_path, MINIGLX_FIFO_NAME); + + if (dpy->IsClient) { + /* Connect to server + */ + if (connect(dpy->fd[0].fd, (struct sockaddr *)&sa, sizeof(sa)) != 0) { + perror("connect"); + shut_fd(dpy,0); + return False; + } + + /* Wait for configuration messages from the server. + */ + welcome_message( dpy, 0 ); + } + else { + mode_t tmp = umask( 0000 ); /* open to everybody ? */ + + /* Bind socket to our filename + */ + if (bind(dpy->fd[0].fd, (struct sockaddr *)&sa, sizeof(sa)) != 0) { + perror("bind"); + shut_fd(dpy,0); + return False; + } + + umask( tmp ); + + /* Listen for connections + */ + if (listen(dpy->fd[0].fd, 5) != 0) { + perror("listen"); + shut_fd(dpy,0); + return False; + } + } + + if (fcntl(dpy->fd[0].fd, F_SETFL, O_NONBLOCK) != 0) { + perror("fcntl"); + shut_fd(dpy,0); + return False; + } + + + return True; +} + + +/** + * Frees the connections initialized by __miniglx_open_connections(). + * + * \param dpy the display handle. + */ +void __miniglx_close_connections( Display *dpy ) +{ + int i; + + for (i = 0 ; i < dpy->nrFds ; i++) { + if (dpy->fd[i].fd >= 0) { + shutdown (dpy->fd[i].fd, SHUT_RDWR); + close (dpy->fd[i].fd); + } + } + + dpy->nrFds = 0; + free(dpy->fd); +} + + +/** + * Set a drawable flag. + * + * \param dpy the display handle. + * \param w drawable (window). + * \param flag flag. + * + * Sets the specified drawable flag in the SAREA and increment its stamp while + * holding the light hardware lock. + */ +static void set_drawable_flag( Display *dpy, int w, int flag ) +{ + if (dpy->driverContext.pSAREA) { + if (dpy->hwActive) + DRM_LIGHT_LOCK( dpy->driverContext.drmFD, + dpy->driverContext.pSAREA, + dpy->driverContext.serverContext ); + + dpy->driverContext.pSAREA->drawableTable[w].stamp++; + dpy->driverContext.pSAREA->drawableTable[w].flags = flag; + + if (dpy->hwActive) + DRM_UNLOCK( dpy->driverContext.drmFD, + dpy->driverContext.pSAREA, + dpy->driverContext.serverContext ); + } +} + + + +/** + * \brief Map Window. + * + * \param dpy the display handle as returned by XOpenDisplay(). + * \param w the window handle. + * + * If called by a client, sends a request for focus to the server. If + * called by the server, will generate a MapNotify and Expose event at + * the client. + * + */ +void +XMapWindow( Display *dpy, Window w ) +{ + if (dpy->IsClient) + send_char_msg( dpy, 0, _CanIHaveFocus ); + else { + set_drawable_flag( dpy, (int)w, 1 ); + send_char_msg( dpy, (int)w, _YouveGotFocus ); + send_char_msg( dpy, (int)w, _RepaintPlease ); + dpy->TheWindow = w; + } + handle_fd_events( dpy, 0 ); /* flush write queue */ +} + +/** + * \brief Unmap Window. + * + * \param dpy the display handle as returned by XOpenDisplay(). + * \param w the window handle. + * + * Called from the client: Lets the server know that the window won't + * be updated anymore. + * + * Called from the server: Tells the specified client that it no longer + * holds the focus. + */ +void +XUnmapWindow( Display *dpy, Window w ) +{ + if (dpy->IsClient) { + send_char_msg( dpy, 0, _IDontWantFocus ); + } + else { + dpy->TheWindow = 0; + set_drawable_flag( dpy, (int)w, 0 ); + send_char_msg( dpy, (int)w, _YouveLostFocus ); + } + handle_fd_events( dpy, 0 ); /* flush write queue */ +} + + +/** + * \brief Block and wait for next X event. + * + * \param dpy the display handle as returned by XOpenDisplay(). + * \param event_return a pointer to an XEvent structure for the returned data. + * + * Wait until there is a new XEvent pending. + */ +int XNextEvent(Display *dpy, XEvent *event_return) +{ + for (;;) { + if ( dpy->eventqueue.head != dpy->eventqueue.tail ) + return dequeue_event( dpy, event_return ); + + handle_fd_events( dpy, 0 ); + } +} + +/** + * \brief Non-blocking check for next X event. + * + * \param dpy the display handle as returned by XOpenDisplay(). + * \param event_mask ignored. + * \param event_return a pointer to an XEvent structure for the returned data. + * + * Check if there is a new XEvent pending. Note that event_mask is + * ignored and any pending event will be returned. + */ +Bool XCheckMaskEvent(Display *dpy, long event_mask, XEvent *event_return) +{ + if ( dpy->eventqueue.head != dpy->eventqueue.tail ) + return dequeue_event( dpy, event_return ); + + handle_fd_events( dpy, 1 ); + + return dequeue_event( dpy, event_return ); +} |