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#include <X11/Xlib.h>
#include <X11/extensions/Xfixes.h>
#include <X11/extensions/Xrandr.h>
#include <X11/extensions/XInput2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define INSET 2
typedef struct { int x, y, w, h; } RECT;
typedef struct {
PointerBarrier barrier;
int seam_x;
RECT left;
RECT right;
} SEAM;
Display *dpy;
Window root;
int xi_opcode;
int randr_event_base, randr_error_base;
int xfixes_event_base, xfixes_error_base;
SEAM *seams = 0;
int nseams = 0;
int seam_cap = 0;
int clamp( int v, int lo, int hi ) {
return v < lo ? lo : v > hi ? hi : v;
}
int yranges_overlap( RECT *a, RECT *b ) {
return a->y < b->y + b->h && b->y < a->y + a->h;
}
void destroy_seams() {
for( int i = 0; i < nseams; i++ ) {
if( seams[i].barrier )
XFixesDestroyPointerBarrier( dpy, seams[i].barrier );
}
nseams = 0;
}
void add_seam( int seam_x, RECT L, RECT R ) {
int y_top = L.y < R.y ? L.y : R.y;
int y_bot = (L.y + L.h) > (R.y + R.h) ? (L.y + L.h) : (R.y + R.h);
PointerBarrier b = XFixesCreatePointerBarrier( dpy, root, seam_x, y_top, seam_x, y_bot, 0, 0, 0 );
if( !b )
return;
if( nseams == seam_cap ) {
seam_cap = seam_cap ? seam_cap * 2 : 8;
seams = realloc( seams, seam_cap * sizeof( *seams ) );
}
seams[nseams].barrier = b;
seams[nseams].seam_x = seam_x;
seams[nseams].left = L;
seams[nseams].right = R;
nseams++;
}
void rebuild() {
destroy_seams();
int n = 0;
XRRMonitorInfo *mon = XRRGetMonitors( dpy, root, 1, &n );
if( !mon || n < 2 ) {
if( mon ) XRRFreeMonitors( mon );
XFlush( dpy );
fprintf( stderr, "xseam: %d monitor(s), nothing to map\n", n );
return;
}
RECT *r = calloc( n, sizeof( *r ) );
for( int i = 0; i < n; i++ ) {
r[i].x = mon[i].x; r[i].y = mon[i].y;
r[i].w = mon[i].width; r[i].h = mon[i].height;
}
for( int i = 0; i < n; i++ ) {
for( int j = 0; j < n; j++ ) {
if( i == j ) continue;
if( r[i].x + r[i].w == r[j].x && yranges_overlap( &r[i], &r[j] ) )
add_seam( r[j].x, r[i], r[j] );
}
}
free( r );
XRRFreeMonitors( mon );
XFlush( dpy );
fprintf( stderr, "xseam: %d monitors, %d seam(s) mapped\n", n, nseams);
}
void handle_barrier_hit( XIBarrierEvent *ev ) {
SEAM *s = 0;
for( int i = 0; i < nseams; i++ ) {
if( seams[i].barrier == ev->barrier ) { s = &seams[i]; break; }
}
if( !s )
return;
double dx = ev->dx;
if( dx == 0.0 )
return;
int dest_x, dest_y;
if( dx < 0.0 ) {
double yr = ev->root_y;
double yl = s->left.y + (yr - s->right.y) * (double)s->left.h / (double)s->right.h;
dest_x = s->seam_x - INSET;
dest_y = clamp( (int)(yl + 0.5), s->left.y, s->left.y + s->left.h - 1 );
} else {
double yl = ev->root_y;
double yr = s->right.y + (yl - s->left.y) * (double)s->right.h / (double)s->left.h;
dest_x = s->seam_x + INSET;
dest_y = clamp( (int)(yr + 0.5), s->right.y, s->right.y + s->right.h - 1 );
}
XWarpPointer( dpy, None, root, 0, 0, 0, 0, dest_x, dest_y );
XIBarrierReleasePointer( dpy, ev->deviceid, ev->barrier, ev->eventid );
XFlush( dpy );
}
int main() {
dpy = XOpenDisplay( 0 );
if( !dpy ) { fprintf( stderr, "xseam: cannot open display\n" ); return 1; }
root = DefaultRootWindow( dpy );
int ev, err;
if( !XFixesQueryExtension( dpy, &xfixes_event_base, &xfixes_error_base ) ) {
fprintf( stderr, "xseam: XFixes missing\n" );
return 1;
}
if( !XQueryExtension( dpy, "XInputExtension", &xi_opcode, &ev, &err ) ) {
fprintf( stderr, "xseam: XInput2 missing\n" );
return 1;
}
if( !XRRQueryExtension( dpy, &randr_event_base, &randr_error_base ) ) {
fprintf( stderr, "xseam: RandR missing\n" );
return 1;
}
XRRSelectInput( dpy, root, RRScreenChangeNotifyMask | RRCrtcChangeNotifyMask | RROutputChangeNotifyMask );
unsigned char m[XIMaskLen(XI_BarrierHit)];
memset( m, 0, sizeof(m) );
XISetMask( m, XI_BarrierHit );
XIEventMask mask;
mask.deviceid = XIAllMasterDevices;
mask.mask_len = sizeof(m);
mask.mask = m;
XISelectEvents( dpy, root, &mask, 1 );
rebuild();
XSync( dpy, 0 );
for( ;; ) {
XEvent ev;
XNextEvent( dpy, &ev );
if( ev.type == GenericEvent && ev.xcookie.extension == xi_opcode ) {
if( XGetEventData( dpy, &ev.xcookie ) ) {
if( ev.xcookie.evtype == XI_BarrierHit )
handle_barrier_hit( (XIBarrierEvent * )ev.xcookie.data );
XFreeEventData( dpy, &ev.xcookie );
}
}
else if( ev.type == randr_event_base + RRScreenChangeNotify ) {
XRRUpdateConfiguration( &ev );
while( XPending( dpy ) ) {
XEvent pk;
XPeekEvent( dpy, &pk );
if( pk.type == randr_event_base + RRScreenChangeNotify
|| pk.type == randr_event_base + RRNotify ) {
XNextEvent( dpy, &pk );
if( pk.type == randr_event_base + RRScreenChangeNotify )
XRRUpdateConfiguration( &pk );
} else break;
}
rebuild();
}
else if( ev.type == randr_event_base + RRNotify ) {
rebuild();
}
}
}
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