32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/*
|
||
* vim:ts=4:sw=4:expandtab
|
||
*
|
||
* i3 - an improved dynamic tiling window manager
|
||
* © 2009-2014 Michael Stapelberg and contributors (see also: LICENSE)
|
||
*
|
||
*/
|
||
#include "libi3.h"
|
||
#include <math.h>
|
||
|
||
extern xcb_screen_t *root_screen;
|
||
|
||
/*
|
||
* Convert a logical amount of pixels (e.g. 2 pixels on a “standard” 96 DPI
|
||
* screen) to a corresponding amount of physical pixels on a standard or retina
|
||
* screen, e.g. 5 pixels on a 227 DPI MacBook Pro 13" Retina screen.
|
||
*
|
||
*/
|
||
int logical_px(const int logical) {
|
||
const int dpi = (double)root_screen->height_in_pixels * 25.4 /
|
||
(double)root_screen->height_in_millimeters;
|
||
/* There are many misconfigurations out there, i.e. systems with screens
|
||
* whose dpi is in fact higher than 96 dpi, but not significantly higher,
|
||
* so software was never adapted. We could tell people to reconfigure their
|
||
* systems to 96 dpi in order to get the behavior they expect/are used to,
|
||
* but since we can easily detect this case in code, let’s do it for them.
|
||
*/
|
||
if ((dpi / 96.0) < 1.25)
|
||
return logical;
|
||
return ceil((dpi / 96.0) * logical);
|
||
}
|