itgmania212121/stepmania/src/archutils/Unix/X11Helper.cpp

#include "global.h"
#include "X11Helper.h"

#include <X11/Xlib.h>		// Display, Window

#include "RageLog.h"
#include "RageDisplay.h"
#include "RageThreads.h"

static vector<long>		pMasks;				// Currently open masks
static unsigned short int	pCt		= 0;		// Number of subsystems
							// using the X connection

Display *X11Helper::Dpy = NULL;
Window X11Helper::Win;

int protoErrorCallback( Display*, XErrorEvent* );
int protoFatalCallback( Display* );

bool X11Helper::Go()
{
	if( pCt == 0 )
	{
		Dpy = XOpenDisplay(0);
		if( Dpy == NULL )
			return false;

		XSetIOErrorHandler( &protoFatalCallback );
		XSetErrorHandler( &protoErrorCallback );
	}
	pCt++;

	return true;
}

void X11Helper::Stop()
{
	pCt--;

	if( pCt == 0 )
	{
		XCloseDisplay( Dpy );
		Dpy = NULL;	// For sanity's sake
		pMasks.clear();
	}
}

static bool pApplyMasks();

bool X11Helper::OpenMask( long mask )
{
	pMasks.push_back(mask);
	return pApplyMasks();
}

bool X11Helper::CloseMask( long mask )
{
	vector<long>::iterator i = find( pMasks.begin(), pMasks.end(), mask );
	if( i == pMasks.end() )
		return true;

	pMasks.erase( i );

	return pApplyMasks();
}

static bool pApplyMasks()
{
	if( X11Helper::Dpy != NULL )
	{
		long finalMask = 0;

		LOG->Trace("X11Helper: Reapplying event masks.");

		unsigned int i = 0;
		while(i < pMasks.size() )
		{
			finalMask |= pMasks[i];
			i++;
		}

		if(XSelectInput(X11Helper::Dpy, X11Helper::Win, finalMask) == 0) { return false; }
	}

	return true;
}

bool X11Helper::MakeWindow( int screenNum, int depth, Visual *visual, int width, int height )
{
	static bool pHaveWin = false;
	vector<long>::iterator i;
	
	if( pCt == 0 )
		return false;

	if( pHaveWin )
	{
		XDestroyWindow( Dpy, Win );
		pHaveWin = false;
	}
		// pHaveWin will stay false if an error occurs once I do error
		// checking here...

	XSetWindowAttributes winAttribs;

	winAttribs.border_pixel = 0;
	winAttribs.event_mask = 0;
	i = pMasks.begin();
	while( i != pMasks.end() )
	{
		winAttribs.event_mask |= *i;
		i++;
	}

	// XXX: Error catching/handling?

	winAttribs.colormap = XCreateColormap( Dpy, RootWindow(Dpy, screenNum), visual, AllocNone );

	Win = XCreateWindow( Dpy, RootWindow(Dpy, screenNum), 0, 0, width,
		height, 0, depth, InputOutput, visual,
		CWBorderPixel | CWColormap | CWEventMask, &winAttribs );

	pHaveWin = true;

	return true;
}

int protoErrorCallback( Display *d, XErrorEvent *err )
{
	char errText[512];
	XGetErrorText( d,  err->error_code, errText, 512 );
	LOG->Warn( "X11 Protocol error %s (%d) has occurred, caused by request %d,%d, resource ID %d",
		errText, err->error_code, err->request_code, err->minor_code, err->resourceid );

	return 0; // Xlib ignores our return value
}

int protoFatalCallback( Display *d )
{
	RageException::Throw( "Fatal I/O error communicating with X server." );
}

/*
 * (c) 2005 Ben Anderson
 * 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, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 *
 * 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 OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR 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.
 */