+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
+ *
+ */
#include "libi3.h"
#include <math.h>
*
*/
int logical_px(const int logical) {
+ if (root_screen == NULL) {
+ /* Dpi info may not be available when parsing a config without an X
+ * server, such as for config file validation. */
+ return logical;
+ }
+
const int dpi = (double)root_screen->height_in_pixels * 25.4 /
(double)root_screen->height_in_millimeters;
- return ceil((dpi / 96.0) * logical);
+ /* 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);
}