sdl_x11events.c

Simple DirectMedia Layer - Simple DirectMedia Layer 是一个跨平台的多媒体库设计用来提供快速图形framebuffer和音频驱动。应用MPEG为软件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_x11events.c,v 1.15 2002/09/16 07:09:04 slouken Exp $";
#endif

/* Handle the event stream, converting X11 events into SDL events */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#ifdef __SVR4
#include <X11/Sunkeysym.h>
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>

#include "SDL.h"
#include "SDL_syswm.h"
#include "SDL_sysevents.h"
#include "SDL_sysvideo.h"
#include "SDL_events_c.h"
#include "SDL_x11video.h"
#include "SDL_x11dga_c.h"
#include "SDL_x11modes_c.h"
#include "SDL_x11image_c.h"
#include "SDL_x11gamma_c.h"
#include "SDL_x11wm_c.h"
#include "SDL_x11mouse_c.h"
#include "SDL_x11events_c.h"


/* Define this if you want to debug X11 events */
/*#define DEBUG_XEVENTS*/

/* The translation tables from an X11 keysym to a SDL keysym */
static SDLKey ODD_keymap[256];
static SDLKey MISC_keymap[256];
SDL_keysym *X11_TranslateKey(Display *display, XKeyEvent *xkey, KeyCode kc,
			     SDL_keysym *keysym);

/* Check to see if this is a repeated key.
   (idea shamelessly lifted from GII -- thanks guys! :)
 */
static int X11_KeyRepeat(Display *display, XEvent *event)
{
	XEvent peekevent;
	int repeated;

	repeated = 0;
	if ( XPending(display) ) {
		XPeekEvent(display, &peekevent);
		if ( (peekevent.type == KeyPress) &&
		     (peekevent.xkey.keycode == event->xkey.keycode) &&
		     ((peekevent.xkey.time-event->xkey.time) < 2) ) {
			repeated = 1;
			XNextEvent(display, &peekevent);
		}
	}
	return(repeated);
}

/* Note:  The X server buffers and accumulates mouse motion events, so
   the motion event generated by the warp may not appear exactly as we
   expect it to.  We work around this (and improve performance) by only
   warping the pointer when it reaches the edge, and then wait for it.
*/
#define MOUSE_FUDGE_FACTOR	8

static __inline__ int X11_WarpedMotion(_THIS, XEvent *xevent)
{
	int w, h, i;
	int deltax, deltay;
	int posted;

	w = SDL_VideoSurface->w;
	h = SDL_VideoSurface->h;
	deltax = xevent->xmotion.x - mouse_last.x;
	deltay = xevent->xmotion.y - mouse_last.y;
#ifdef DEBUG_MOTION
  printf("Warped mouse motion: %d,%d\n", deltax, deltay);
#endif
	mouse_last.x = xevent->xmotion.x;
	mouse_last.y = xevent->xmotion.y;
	posted = SDL_PrivateMouseMotion(0, 1, deltax, deltay);

	if ( (xevent->xmotion.x < MOUSE_FUDGE_FACTOR) ||
	     (xevent->xmotion.x > (w-MOUSE_FUDGE_FACTOR)) ||
	     (xevent->xmotion.y < MOUSE_FUDGE_FACTOR) ||
	     (xevent->xmotion.y > (h-MOUSE_FUDGE_FACTOR)) ) {
		/* Get the events that have accumulated */
		while ( XCheckTypedEvent(SDL_Display, MotionNotify, xevent) ) {
			deltax = xevent->xmotion.x - mouse_last.x;
			deltay = xevent->xmotion.y - mouse_last.y;
#ifdef DEBUG_MOTION
  printf("Extra mouse motion: %d,%d\n", deltax, deltay);
#endif
			mouse_last.x = xevent->xmotion.x;
			mouse_last.y = xevent->xmotion.y;
			posted += SDL_PrivateMouseMotion(0, 1, deltax, deltay);
		}
		mouse_last.x = w/2;
		mouse_last.y = h/2;
		XWarpPointer(SDL_Display, None, SDL_Window, 0, 0, 0, 0,
					mouse_last.x, mouse_last.y);
		for ( i=0; i<10; ++i ) {
        		XMaskEvent(SDL_Display, PointerMotionMask, xevent);
			if ( (xevent->xmotion.x >
			          (mouse_last.x-MOUSE_FUDGE_FACTOR)) &&
			     (xevent->xmotion.x <
			          (mouse_last.x+MOUSE_FUDGE_FACTOR)) &&
			     (xevent->xmotion.y >
			          (mouse_last.y-MOUSE_FUDGE_FACTOR)) &&
			     (xevent->xmotion.y <
			          (mouse_last.y+MOUSE_FUDGE_FACTOR)) ) {
				break;
			}
#ifdef DEBUG_XEVENTS
  printf("Lost mouse motion: %d,%d\n", xevent->xmotion.x, xevent->xmotion.y);
#endif
		}
#ifdef DEBUG_XEVENTS
		if ( i == 10 ) {
			printf("Warning: didn't detect mouse warp motion\n");
		}
#endif
	}
	return(posted);
}

static int X11_DispatchEvent(_THIS)
{
	int posted;
	XEvent xevent;

	XNextEvent(SDL_Display, &xevent);

	posted = 0;
	switch (xevent.type) {

	    /* Gaining mouse coverage? */
	    case EnterNotify: {
#ifdef DEBUG_XEVENTS
printf("EnterNotify! (%d,%d)\n", xevent.xcrossing.x, xevent.xcrossing.y);
if ( xevent.xcrossing.mode == NotifyGrab )
printf("Mode: NotifyGrab\n");
if ( xevent.xcrossing.mode == NotifyUngrab )
printf("Mode: NotifyUngrab\n");
#endif
		if ( (xevent.xcrossing.mode != NotifyGrab) &&
		     (xevent.xcrossing.mode != NotifyUngrab) ) {
			if ( this->input_grab == SDL_GRAB_OFF ) {
				posted = SDL_PrivateAppActive(1, SDL_APPMOUSEFOCUS);
			} else {
				posted = SDL_PrivateMouseMotion(0, 0,
						xevent.xcrossing.x,
						xevent.xcrossing.y);
			}
		}
	    }
	    break;

	    /* Losing mouse coverage? */
	    case LeaveNotify: {
#ifdef DEBUG_XEVENTS
printf("LeaveNotify! (%d,%d)\n", xevent.xcrossing.x, xevent.xcrossing.y);
if ( xevent.xcrossing.mode == NotifyGrab )
printf("Mode: NotifyGrab\n");
if ( xevent.xcrossing.mode == NotifyUngrab )
printf("Mode: NotifyUngrab\n");
#endif
		if ( (xevent.xcrossing.mode != NotifyGrab) &&
		     (xevent.xcrossing.mode != NotifyUngrab) &&
		     (xevent.xcrossing.detail != NotifyInferior) ) {
			if ( this->input_grab == SDL_GRAB_OFF ) {
				posted = SDL_PrivateAppActive(0, SDL_APPMOUSEFOCUS);
			} else {
				posted = SDL_PrivateMouseMotion(0, 0,
						xevent.xcrossing.x,
						xevent.xcrossing.y);
			}
		}
	    }
	    break;

	    /* Gaining input focus? */
	    case FocusIn: {
#ifdef DEBUG_XEVENTS
printf("FocusIn!\n");
#endif
		posted = SDL_PrivateAppActive(1, SDL_APPINPUTFOCUS);

		/* Queue entry into fullscreen mode */
		switch_waiting = 0x01 | SDL_FULLSCREEN;
		switch_time = SDL_GetTicks() + 1500;
	    }
	    break;

	    /* Losing input focus? */
	    case FocusOut: {
#ifdef DEBUG_XEVENTS
printf("FocusOut!\n");
#endif
		posted = SDL_PrivateAppActive(0, SDL_APPINPUTFOCUS);

		/* Queue leaving fullscreen mode */
		switch_waiting = 0x01;
		switch_time = SDL_GetTicks() + 200;
	    }
	    break;

	    /* Generated upon EnterWindow and FocusIn */
	    case KeymapNotify: {
#ifdef DEBUG_XEVENTS
printf("KeymapNotify!\n");
#endif
		X11_SetKeyboardState(SDL_Display, xevent.xkeymap.key_vector);
	    }
	    break;

	    /* Mouse motion? */
	    case MotionNotify: {
		if ( SDL_VideoSurface ) {
			if ( mouse_relative ) {
				if ( using_dga & DGA_MOUSE ) {
#ifdef DEBUG_MOTION
  printf("DGA motion: %d,%d\n", xevent.xmotion.x_root, xevent.xmotion.y_root);
#endif
					posted = SDL_PrivateMouseMotion(0, 1,
							xevent.xmotion.x_root,
							xevent.xmotion.y_root);
				} else {
					posted = X11_WarpedMotion(this,&xevent);
				}
			} else {
#ifdef DEBUG_MOTION
  printf("X11 motion: %d,%d\n", xevent.xmotion.x, xevent.xmotion.y);
#endif
				posted = SDL_PrivateMouseMotion(0, 0,
						xevent.xmotion.x,
						xevent.xmotion.y);
			}
		}
	    }
	    break;

	    /* Mouse button press? */
	    case ButtonPress: {
		posted = SDL_PrivateMouseButton(SDL_PRESSED, 
					xevent.xbutton.button, 0, 0);
	    }
	    break;

	    /* Mouse button release? */
	    case ButtonRelease: {
		posted = SDL_PrivateMouseButton(SDL_RELEASED, 
					xevent.xbutton.button, 0, 0);
	    }
	    break;

	    /* Key press? */
	    case KeyPress: {
		SDL_keysym keysym;

#ifdef DEBUG_XEVENTS
printf("KeyPress (X11 keycode = 0x%X)\n", xevent.xkey.keycode);
#endif
		posted = SDL_PrivateKeyboard(SDL_PRESSED,
				X11_TranslateKey(SDL_Display, &xevent.xkey,
						 xevent.xkey.keycode,
						 &keysym));
	    }
	    break;

	    /* Key release? */
	    case KeyRelease: {
		SDL_keysym keysym;

#ifdef DEBUG_XEVENTS
printf("KeyRelease (X11 keycode = 0x%X)\n", xevent.xkey.keycode);
#endif
		/* Check to see if this is a repeated key */
		if ( ! X11_KeyRepeat(SDL_Display, &xevent) ) {
			posted = SDL_PrivateKeyboard(SDL_RELEASED, 
				X11_TranslateKey(SDL_Display, &xevent.xkey,
						 xevent.xkey.keycode,
						 &keysym));
		}
	    }
	    break;

	    /* Have we been iconified? */
	    case UnmapNotify: {
#ifdef DEBUG_XEVENTS
printf("UnmapNotify!\n");
#endif
		/* If we're active, make ourselves inactive */
		if ( SDL_GetAppState() & SDL_APPACTIVE ) {
			/* Swap out the gamma before we go inactive */
			X11_SwapVidModeGamma(this);

			/* Send an internal deactivate event */
			posted = SDL_PrivateAppActive(0,
					SDL_APPACTIVE|SDL_APPINPUTFOCUS);
		}
	    }
	    break;

	    /* Have we been restored? */
	    case MapNotify: {
#ifdef DEBUG_XEVENTS
printf("MapNotify!\n");
#endif
		/* If we're not active, make ourselves active */
		if ( !(SDL_GetAppState() & SDL_APPACTIVE) ) {
			/* Send an internal activate event */
			posted = SDL_PrivateAppActive(1, SDL_APPACTIVE);

			/* Now that we're active, swap the gamma back */
			X11_SwapVidModeGamma(this);
		}

		if ( SDL_VideoSurface &&
		     (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
			X11_EnterFullScreen(this);
		} else {
			X11_GrabInputNoLock(this, this->input_grab);
		}
		X11_CheckMouseModeNoLock(this);

		if ( SDL_VideoSurface ) {
			X11_RefreshDisplay(this);
		}
	    }
	    break;

	    /* Have we been resized or moved? */
	    case ConfigureNotify: {
#ifdef DEBUG_XEVENTS
printf("ConfigureNotify! (resize: %dx%d)\n", xevent.xconfigure.width, xevent.xconfigure.height);
#endif
		if ( SDL_VideoSurface ) {
		    if ((xevent.xconfigure.width != SDL_VideoSurface->w) ||
		        (xevent.xconfigure.height != SDL_VideoSurface->h)) {
			/* FIXME: Find a better fix for the bug with KDE 1.2 */
			if ( ! ((xevent.xconfigure.width == 32) &&
			        (xevent.xconfigure.height == 32)) ) {
				SDL_PrivateResize(xevent.xconfigure.width,
				                  xevent.xconfigure.height);
			}
		    } else {
			/* OpenGL windows need to know about the change */
			if ( SDL_VideoSurface->flags & SDL_OPENGL ) {
				SDL_PrivateExpose();
			}
		    }
		}
	    }
	    break;

	    /* Have we been requested to quit (or another client message?) */
	    case ClientMessage: {
		if ( (xevent.xclient.format == 32) &&
		     (xevent.xclient.data.l[0] == WM_DELETE_WINDOW) )
		{
			posted = SDL_PrivateQuit();
		} else
		if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) {
			SDL_SysWMmsg wmmsg;

			SDL_VERSION(&wmmsg.version);
			wmmsg.subsystem = SDL_SYSWM_X11;
			wmmsg.event.xevent = xevent;
			posted = SDL_PrivateSysWMEvent(&wmmsg);
		}
	    }
	    break;

	    /* Do we need to refresh ourselves? */
	    case Expose: {
#ifdef DEBUG_XEVENTS
printf("Expose (count = %d)\n", xevent.xexpose.count);
#endif
		if ( SDL_VideoSurface && (xevent.xexpose.count == 0) ) {
			X11_RefreshDisplay(this);
		}
	    }
	    break;

	    default: {
#ifdef DEBUG_XEVENTS
printf("Unhandled event %d\n", xevent.type);
#endif
		/* Only post the event if we're watching for it */
		if ( SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE ) {
			SDL_SysWMmsg wmmsg;

			SDL_VERSION(&wmmsg.version);
			wmmsg.subsystem = SDL_SYSWM_X11;
			wmmsg.event.xevent = xevent;
			posted = SDL_PrivateSysWMEvent(&wmmsg);
		}
	    }
	    break;
	}
	return(posted);
}

/* Ack!  XPending() actually performs a blocking read if no events available */
int X11_Pending(Display *display)
{
	/* Flush the display connection and look to see if events are queued */
	XFlush(display);
	if ( XEventsQueued(display, QueuedAlready) ) {
		return(1);
	}

	/* More drastic measures are required -- see if X is ready to talk */
	{
		static struct timeval zero_time;	/* static == 0 */
		int x11_fd;
		fd_set fdset;

		x11_fd = ConnectionNumber(display);
		FD_ZERO(&fdset);
		FD_SET(x11_fd, &fdset);
		if ( select(x11_fd+1, &fdset, NULL, NULL, &zero_time) == 1 ) {
			return(XPending(display));
		}
	}

	/* Oh well, nothing is ready .. */
	return(0);
}

void X11_PumpEvents(_THIS)
{
	int pending;

	/* Keep processing pending events */
	pending = 0;
	while ( X11_Pending(SDL_Display) ) {
		X11_DispatchEvent(this);
		++pending;
	}
	if ( switch_waiting ) {
		Uint32 now;

		now  = SDL_GetTicks();