4 extern xcb_screen_t *root_screen;
7 * Convert a logical amount of pixels (e.g. 2 pixels on a “standard” 96 DPI
8 * screen) to a corresponding amount of physical pixels on a standard or retina
9 * screen, e.g. 5 pixels on a 227 DPI MacBook Pro 13" Retina screen.
12 int logical_px(const int logical) {
13 const int dpi = (double)root_screen->height_in_pixels * 25.4 /
14 (double)root_screen->height_in_millimeters;
15 return ceil((dpi / 96.0) * logical);