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screenclone.cc
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screenclone.cc
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#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <functional>
#include <iostream>
#include <mutex>
#include <string>
#include <thread>
#include <vector>
#include <list>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <X11/Xcursor/Xcursor.h>
#include <X11/Xlib.h>
#include <X11/Xproto.h>
#include <X11/cursorfont.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xinerama.h>
#include <X11/extensions/record.h>
#define STR2(x) #x
#define STR(x) STR2( x )
#define ERR throw std::runtime_error( std::string() + __FILE__ + ":" + STR( __LINE__ ) + " " + __FUNCTION__ )
#if 1 // debugging off
# define DBG(x)
#else // debugging on
# define DBG(x) x
#endif
uint64_t microtime() {
struct timeval tv;
gettimeofday( &tv, NULL );
return tv.tv_sec * 1000000 + tv.tv_usec;
}
#if 1 // time tracing off
# define TC(x) x
#else // time tracing on
# define TC(x) \
({ uint64_t t1, t2; t1 = microtime(); auto ret = ( x ); t2 = microtime(); \
printf( "%15llu - %5d: %s\n", t2 - t1, __LINE__, #x ); ret; })
#endif
struct window;
struct xinerama_screen;
struct display {
Display *dpy;
int damage_event, damage_error;
int xfixes_event, xfixes_error;
display( const std::string &name );
display clone() const;
window root() const;
XEvent next_event();
int pending();
template < typename Fun > void record_pointer_events( Fun *callback );
void select_cursor_input( const window &win );
typedef std::vector< xinerama_screen > screens_vector;
screens_vector xinerama_screens();
};
struct window {
const display *d;
Window win;
Damage dmg;
window( const display &_d, Window _win ) : d( &_d ), win( _win ), dmg( 0 ) {}
void create_damage();
void clear_damage();
void warp_pointer( int x, int y );
void define_cursor( Cursor c );
};
struct xinerama_screen {
const display *d;
XineramaScreenInfo info;
xinerama_screen( const display &_d, const XineramaScreenInfo &_info )
: d( &_d ), info( _info ) {}
bool in_screen( int x, int y ) const;
bool intersect_rectangle( const XRectangle &rec ) const;
};
display::display( const std::string &name ) {
dpy = XOpenDisplay( name.c_str() );
if ( !dpy ) ERR;
if ( !XDamageQueryExtension( dpy, &damage_event, &damage_error ) )
ERR;
if ( !XFixesQueryExtension( dpy, &xfixes_event, &xfixes_error ) )
ERR;
}
display display::clone() const {
return display( DisplayString( dpy ) );
}
window display::root() const {
return window( *this, DefaultRootWindow( dpy ) );
}
XEvent display::next_event() {
XEvent e;
if ( XNextEvent( dpy, &e ) ) ERR;
return e;
}
int display::pending() {
return XPending( dpy );
}
template < typename Fun >
void record_callback( XPointer priv, XRecordInterceptData *data ) {
Fun *f = (Fun *) priv;
(*f)( data );
}
template < typename Fun >
void record_thread( display data, Fun *callback ) {
int fd = ConnectionNumber( data.dpy );
fd_set fds;
FD_ZERO( &fds );
for ( ;; ) {
FD_SET( fd, &fds );
select( fd + 1, &fds, NULL, NULL, NULL );
XRecordProcessReplies( data.dpy );
}
}
template < typename Fun >
void display::record_pointer_events( Fun *callback ) {
display data = clone();
XRecordRange *rr = XRecordAllocRange();
if ( !rr ) ERR;
rr->device_events.first = rr->device_events.last = MotionNotify;
XRecordClientSpec rcs = XRecordAllClients;
XRecordContext rc = XRecordCreateContext( dpy, 0, &rcs, 1, &rr, 1 );
if ( !rc ) ERR;
// sync, otherwise XRecordEnableContextAsync fails
XSync( dpy, false );
XSync( data.dpy, false );
if ( !XRecordEnableContextAsync( data.dpy, rc, &record_callback< Fun >, (XPointer) callback ) )
ERR;
std::thread( &record_thread< Fun >, data, callback ).detach();
}
void display::select_cursor_input( const window &win ) {
XFixesSelectCursorInput( dpy, win.win, XFixesDisplayCursorNotifyMask );
}
display::screens_vector display::xinerama_screens() {
int number;
XineramaScreenInfo *screens = XineramaQueryScreens( dpy, &number );
if ( !screens ) ERR;
screens_vector vec;
for ( int i = 0; i < number; ++i )
vec.push_back( xinerama_screen( *this, screens[ i ] ) );
XFree( screens );
return vec;
}
void window::create_damage() {
if ( !( dmg = XDamageCreate( d->dpy, win, XDamageReportRawRectangles ) ) )
ERR;
}
void window::clear_damage() {
if ( !dmg ) ERR;
XDamageSubtract( d->dpy, dmg, None, None );
}
void window::warp_pointer( int x, int y ) {
TC( XWarpPointer( d->dpy, None, win, 0, 0, 0, 0, x, y ) );
}
void window::define_cursor( Cursor c ) {
TC( XDefineCursor( d->dpy, win, c ) );
}
bool xinerama_screen::in_screen( int x, int y ) const {
return x >= info.x_org && x < info.x_org + info.width
&& y >= info.y_org && y < info.y_org + info.height;
}
bool segment_intersect( int a1, int a2, int b1, int b2 ) {
return a1 < b1 ? a2 > b1 : b2 > a1;
}
bool xinerama_screen::intersect_rectangle( const XRectangle &rec ) const {
return segment_intersect( rec.x, rec.x + rec.width, info.x_org, info.x_org + info.width )
&& segment_intersect( rec.y, rec.y + rec.height, info.y_org, info.y_org + info.height );
}
struct image_replayer {
const display *src, *dst;
const xinerama_screen *src_screen;
const xinerama_screen *dst_screen;
window src_window, dst_window;
XShmSegmentInfo src_info, dst_info;
XImage *src_image, *dst_image;
GC dst_gc;
bool damaged;
image_replayer( const display &_src, const display &_dst, const xinerama_screen &_src_screen,const xinerama_screen &_dst_screen )
: src( &_src ), dst( &_dst), src_screen( &_src_screen ), dst_screen( &_dst_screen )
, src_window( src->root() ), dst_window( dst->root() )
, damaged( true )
{
size_t sz = src_screen->info.width * src_screen->info.height * 4;
src_info.shmid = dst_info.shmid = shmget( IPC_PRIVATE, sz, IPC_CREAT | 0666 );
src_info.shmaddr = dst_info.shmaddr = (char *) shmat( src_info.shmid, 0, 0);
src_info.readOnly = dst_info.readOnly = false;
shmctl( src_info.shmid, IPC_RMID, NULL );
src_image = XShmCreateImage( src->dpy, DefaultVisual( src->dpy, DefaultScreen( src->dpy ) ),
DefaultDepth( src->dpy, DefaultScreen( src->dpy ) ), ZPixmap, src_info.shmaddr,
&src_info, src_screen->info.width, src_screen->info.height );
dst_image = XShmCreateImage( dst->dpy, DefaultVisual( dst->dpy, DefaultScreen( dst->dpy ) ),
DefaultDepth( dst->dpy, DefaultScreen( dst->dpy ) ), ZPixmap, dst_info.shmaddr,
&dst_info, src_screen->info.width, src_screen->info.height );
XShmAttach( src->dpy, &src_info );
XShmAttach( dst->dpy, &dst_info );
dst_gc = DefaultGC( dst->dpy, DefaultScreen( dst->dpy ) );
}
void copy_if_damaged() {
if ( !damaged )
return;
TC( XShmGetImage( src->dpy, src_window.win, src_image,
src_screen->info.x_org, src_screen->info.y_org, AllPlanes) );
TC( XShmPutImage( dst->dpy, dst_window.win, dst_gc, dst_image, 0, 0, dst_screen->info.x_org, dst_screen->info.y_org,
dst_image->width, dst_image->height, False ) );
TC( XFlush( dst->dpy ) );
DBG( std::cout << "damaged" << std::endl );
damaged = false;
}
void damage( const XRectangle &rec ) {
damaged = damaged || src_screen->intersect_rectangle( rec );
}
};
struct mouse_replayer {
const display src, dst;
window dst_window;
Cursor invisibleCursor;
volatile bool on;
std::recursive_mutex cursor_mutex;
std::vector<std::pair<const xinerama_screen*,const xinerama_screen *> > screens;
mouse_replayer( const display &_src, const display &_dst)
: src( _src ), dst( _dst), dst_window( dst.root() )
, on( false )
{
// create invisible cursor
Pixmap bitmapNoData;
XColor black;
static char noData[] = { 0,0,0,0,0,0,0,0 };
black.red = black.green = black.blue = 0;
bitmapNoData = XCreateBitmapFromData( dst.dpy, dst_window.win, noData, 8, 8 );
invisibleCursor = XCreatePixmapCursor( dst.dpy, bitmapNoData, bitmapNoData,
&black, &black, 0, 0);
dst_window.define_cursor( invisibleCursor );
}
void add_screen(const xinerama_screen &src_screen, const xinerama_screen &dst_screen) {
screens.emplace_back(&src_screen, &dst_screen);
}
void operator() ( XRecordInterceptData *data ) {
if ( data->category == XRecordFromServer ) {
const xEvent &e = * (const xEvent *) data->data;
if ( e.u.u.type == MotionNotify ) {
mouse_moved( e.u.keyButtonPointer.rootX, e.u.keyButtonPointer.rootY );
}
}
XRecordFreeData( data );
}
void mouse_moved( int x, int y ) {
std::lock_guard< std::recursive_mutex > guard( cursor_mutex );
bool old_on = on;
auto on_screen = screens.begin();
for(; on_screen != screens.end(); ++on_screen) {
if(on_screen->first->in_screen(x,y)) {
break;
}
}
on = on_screen != screens.end();
if ( on )
dst_window.warp_pointer( x - on_screen->first->info.x_org + on_screen->second->info.x_org, y - on_screen->first->info.y_org + on_screen->second->info.y_org );
else
// wiggle the cursor a bit to keep screensaver away
dst_window.warp_pointer( x % 50, y % 50 );
if ( old_on != on ) {
if ( on )
cursor_changed();
else
dst_window.define_cursor( invisibleCursor );
}
TC( XFlush( dst.dpy ) );
DBG( std::cout << "mouse moved" << std::endl );
}
void cursor_changed() {
std::lock_guard< std::recursive_mutex > guard( cursor_mutex );
if ( !on )
return;
XFixesCursorImage *cur;
XcursorImage image;
Cursor cursor;
cur = TC( XFixesGetCursorImage( src.dpy ) );
if ( !cur )
return;
memset( &image, 0, sizeof( image ) );
image.width = cur->width;
image.height = cur->height;
image.size = std::max( image.width, image.height );
image.xhot = cur->xhot;
image.yhot = cur->yhot;
if ( 0 && sizeof( * image.pixels ) == sizeof( * cur->pixels ) ) {
// 32-bit machines where int is long
image.pixels = (unsigned int *) cur->pixels;
} else {
image.pixels = (unsigned int *) alloca(
image.width * image.height * sizeof( unsigned int ) );
for ( unsigned i = 0; i < image.width * image.height; ++i )
image.pixels[ i ] = cur->pixels[ i ];
}
cursor = TC( XcursorImageLoadCursor( dst.dpy, &image ) );
XFree( cur );
TC( XDefineCursor( dst.dpy, dst_window.win, cursor ) );
XFreeCursor( dst.dpy, cursor );
TC( XFlush( dst.dpy ) );
DBG( std::cout << "cursor changed" << std::endl );
}
};
void usage( const char *name )
{
std::cerr
<< "Usage: " << name << " <options>" << std::endl
<< "Options:" << std::endl
<< " -s <display name> (default :0)" << std::endl
<< " -d <display name> (default :1)" << std::endl
<< " -x <xinerama screen number> (default 0:0)" << std::endl
<< " or -x <source screen number>:<dest screen number> (can be repeated)" << std::endl
<< " -b <path to bumblebee socket> (default /var/run/bumblebee.socket)" << std::endl;
exit( 0 );
}
int main( int argc, char *argv[] )
{
XInitThreads();
std::string src_name( ":0" ), dst_name;
std::vector<std::pair<unsigned, unsigned> > screen_number;
bool bumblebee = false;
int opt;
while ( ( opt = getopt( argc, argv, "s:d:x:h:b" ) ) != -1 )
switch ( opt ) {
case 's':
src_name = optarg;
break;
case 'd':
dst_name = optarg;
break;
case 'x':
{
unsigned src_screen_number = atoi(optarg);
unsigned dst_screen_number = 0;
char *dstarg = strchr(optarg,':');
if(dstarg) {
dst_screen_number = atoi(dstarg+1);
}
screen_number.emplace_back(src_screen_number,dst_screen_number);
}
break;
case 'b':
bumblebee = true;
break;
default:
usage( argv[ 0 ] );
}
if(bumblebee) {
int sock = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, optarg && *optarg ? optarg : "/var/run/bumblebee.socket");
connect(sock, (struct sockaddr *)&addr, sizeof(addr));
if(errno) ERR;
// ask bumblebee to start up the secondary X
static char c[256] = "C";
send(sock, &c, 1, 0);
recv(sock, &c, 255, 0);
if(c[0] == 'N') fprintf(stderr,"Bumblebee GL check failed: %s\n", c + 5);
else if(c[0] != 'Y') fprintf(stderr,"failure contacting Bumblebee daemon\n");
if(dst_name.empty()) {
// ask bumblebee which screen we're on
strcpy(c,"Q VirtualDisplay");
send(sock, &c, 17, 0);
recv(sock, &c, 255, 0);
if(strncmp(c,"Value: ",7) == 0) {
char *arg = c+7;
char *newline = strchr(arg,'\n');
if(newline) *newline = '\0';
dst_name=arg;
} else {
fprintf(stderr,"Bumblebee VirtualDisplay failed: %s\n",c);
}
}
} else { // no user setting, no bumblebee, just guess
dst_name = ":1";
}
if ( src_name == dst_name )
ERR;
display src( src_name ), dst( dst_name );
if(screen_number.empty()) {
screen_number.emplace_back(0,0);
}
std::list<image_replayer> image;
mouse_replayer mouse( src.clone(), dst );
auto src_screens = src.xinerama_screens();
auto dst_screens = dst.xinerama_screens();
for(auto i = screen_number.begin(); i != screen_number.end(); ++i) {
if ( i->first < 0 || i->first >= src_screens.size() )
ERR;
auto &src_screen = src_screens[ i->first ];
if ( i->second < 0 || i->second >= dst_screens.size() )
ERR;
auto &dst_screen = dst_screens[ i->second ];
image.emplace_back(src,dst,src_screen, dst_screen);
mouse.add_screen(src_screen, dst_screen);
}
window root = src.root();
root.create_damage();
src.record_pointer_events( &mouse );
src.select_cursor_input( root );
for ( ;; ) {
do {
const XEvent e = src.next_event();
if ( e.type == src.damage_event + XDamageNotify ) {
const XDamageNotifyEvent &de = * (const XDamageNotifyEvent *) &e;
for(auto i = image.begin(); i != image.end(); ++i) {
i->damage( de.area );
}
} else if ( e.type == src.xfixes_event + XFixesCursorNotify ) {
mouse.cursor_changed();
}
} while ( src.pending() );
root.clear_damage();
for(auto i = image.begin(); i != image.end(); ++i) {
i->copy_if_damaged();
}
}
}