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/*
* \/\/\
*
* Copyright (C) 2012-2016 Vito Caputo - <vcaputo@gnugeneration.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* return the appropriate screen, don't use the return value across event loops because randr events reallocate the array. */
#include <X11/Xlib.h>
#include <stdarg.h>
#include <values.h>
#include "list.h"
#include "screen.h"
#include "vwm.h"
#include "window.h"
#include "xwindow.h"
/* Xinerama/multihead screen functions */
/* return what fraction (0.0-1.0) of vwin overlaps with scr */
static float vwm_screen_overlaps_xwin(vwm_t *vwm, const vwm_screen_t *scr, vwm_xwindow_t *xwin)
{
float pct = 0, xover = 0, yover = 0;
if (scr->x_org + scr->width < xwin->attrs.x || scr->x_org > xwin->attrs.x + xwin->attrs.width ||
scr->y_org + scr->height < xwin->attrs.y || scr->y_org > xwin->attrs.y + xwin->attrs.height)
goto _out;
/* they overlap, by how much? */
xover = MIN(scr->x_org + scr->width, xwin->attrs.x + xwin->attrs.width) - MAX(scr->x_org, xwin->attrs.x);
yover = MIN(scr->y_org + scr->height, xwin->attrs.y + xwin->attrs.height) - MAX(scr->y_org, xwin->attrs.y);
pct = (xover * yover) / (xwin->attrs.width * xwin->attrs.height);
_out:
VWM_TRACE("xover=%f yover=%f width=%i height=%i pct=%.4f", xover, yover, xwin->attrs.width, xwin->attrs.height, pct);
return pct;
}
const vwm_screen_t * vwm_screen_find(vwm_t *vwm, vwm_screen_rel_t rel, ...)
{
static vwm_screen_t faux;
vwm_screen_t *scr, *best = &faux; /* default to faux as best */
int i;
faux.screen_number = 0;
faux.x_org = 0;
faux.y_org = 0;
faux.width = WidthOfScreen(DefaultScreenOfDisplay(VWM_XDISPLAY(vwm)));
faux.height = HeightOfScreen(DefaultScreenOfDisplay(VWM_XDISPLAY(vwm)));
if (!vwm->xinerama_screens) goto _out;
#define for_each_screen(_tmp) \
for (i = 0, _tmp = vwm->xinerama_screens; i < vwm->xinerama_screens_cnt; _tmp = &vwm->xinerama_screens[++i])
switch (rel) {
case VWM_SCREEN_REL_XWIN: {
va_list ap;
vwm_xwindow_t *xwin;
float best_pct = 0, this_pct;
va_start(ap, rel);
xwin = va_arg(ap, vwm_xwindow_t *);
va_end(ap);
for_each_screen(scr) {
this_pct = vwm_screen_overlaps_xwin(vwm, scr, xwin);
if (this_pct > best_pct) {
best = scr;
best_pct = this_pct;
}
}
break;
}
case VWM_SCREEN_REL_POINTER: {
int root_x, root_y, win_x, win_y;
unsigned int mask;
Window root, child;
/* get the pointer coordinates and find which screen it's in */
XQueryPointer(VWM_XDISPLAY(vwm), VWM_XROOT(vwm), &root, &child, &root_x, &root_y, &win_x, &win_y, &mask);
for_each_screen(scr) {
if (root_x >= scr->x_org && root_x < scr->x_org + scr->width &&
root_y >= scr->y_org && root_y < scr->y_org + scr->height) {
best = scr;
break;
}
}
break;
}
case VWM_SCREEN_REL_TOTAL: {
short x1 = MAXSHORT, y1 = MAXSHORT, x2 = MINSHORT, y2 = MINSHORT;
/* find the smallest x_org and y_org, the highest x_org + width and y_org + height, those are the two corners of the total rect */
for_each_screen(scr) {
if (scr->x_org < x1) x1 = scr->x_org;
if (scr->y_org < y1) y1 = scr->y_org;
if (scr->x_org + scr->width > x2) x2 = scr->x_org + scr->width;
if (scr->y_org + scr->height > y2) y2 = scr->y_org + scr->height;
}
faux.x_org = x1;
faux.y_org = y1;
faux.width = x2 - x1;
faux.height = y2 - y1;
best = &faux;
break;
}
}
_out:
VWM_TRACE("Found Screen #%i: %hix%hi @ %hi,%hi", best->screen_number, best->width, best->height, best->x_org, best->y_org);
return best;
}
/* check if a screen contains any windows (assuming the current desktop) */
int vwm_screen_is_empty(vwm_t *vwm, const vwm_screen_t *scr)
{
vwm_xwindow_t *xwin;
int is_empty = 1;
list_for_each_entry(xwin, &vwm->xwindows, xwindows) {
if (!xwin->mapped) continue;
if (!xwin->managed || (xwin->managed->desktop == vwm->focused_desktop && !xwin->managed->shelved && !xwin->managed->configuring)) {
/* XXX: it may make more sense to see what %age of the screen is overlapped by windows, and consider it empty if < some % */
/* This is just seeing if any window is predominantly within the specified screen, the rationale being if you had a focusable
* window on the screen you would have used the keyboard to make windows go there; this function is only used in determining
* wether a new window should go where the pointer is or not. */
if (vwm_screen_overlaps_xwin(vwm, scr, xwin) >= 0.05) {
is_empty = 0;
break;
}
}
}
return is_empty;
}
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