add log messages for the detected DPI

Currently, the DPI is only logged when pango fonts are used, which is
often not the case when people report problems with the DPI detection.

diff --git a/src/main.c b/src/main.c
index c839cf3bc93e5dfa0bae22adc8f533211511856a..66090dae207c021ec70d0e883044c1d8faa9ad4c 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -558,6 +558,10 @@ int main(int argc, char *argv[]) {
     colormap = root_screen->default_colormap;
 
     DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
+    DLOG("root_screen->height_in_pixels = %d, root_screen->height_in_millimeters = %d, dpi = %d\n",
+         root_screen->height_in_pixels, root_screen->height_in_millimeters,
+         (int)((double)root_screen->height_in_pixels * 25.4 / (double)root_screen->height_in_millimeters));
+    DLOG("One logical pixel corresponds to %d physical pixels on this display.\n", logical_px(1));
 
     xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root);
     xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root);