From f3634d4ff3e3f174130bd9a2f5374a6c2713b160 Mon Sep 17 00:00:00 2001
From: Dave Davenport <qball@blame.services>
Date: Fri, 8 Jul 2022 22:04:06 +0200
Subject: [XCB] Try to correct for rotated monitors.

---
 source/xcb.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/source/xcb.c b/source/xcb.c
index 7a75d088..f53aa3a2 100644
--- a/source/xcb.c
+++ b/source/xcb.c
@@ -426,6 +426,23 @@ static void x11_monitors_free(void) {
   }
 }
 
+/**
+ * Quick function that tries to fix the size (for dpi calculation)
+ * when monitor is rotate. This assumes the density is kinda equal in both X/Y
+ * direction.
+ */
+static void x11_workarea_fix_rotation(workarea *w) {
+  double ratio_res = w->w / (double)w->h;
+  double ratio_size = w->mw / (double)w->mh;
+
+  if ((ratio_res < 1.0 && ratio_size > 1.0) ||
+      (ratio_res > 1.0 && ratio_size < 1.0)) {
+    // Oposite ratios, swap them.
+    int nh = w->mw;
+    w->mw = w->mh;
+    w->mh = nh;
+  }
+}
 /**
  * Create monitor based on output id
  */
@@ -454,6 +471,7 @@ static workarea *x11_get_monitor_from_output(xcb_randr_output_t out) {
 
   retv->mw = op_reply->mm_width;
   retv->mh = op_reply->mm_height;
+  x11_workarea_fix_rotation(retv);
 
   char *tname = (char *)xcb_randr_get_output_info_name(op_reply);
   int tname_len = xcb_randr_get_output_info_name_length(op_reply);
@@ -504,6 +522,7 @@ x11_get_monitor_from_randr_monitor(xcb_randr_monitor_info_t *mon) {
   // Physical
   retv->mw = mon->width_in_millimeters;
   retv->mh = mon->height_in_millimeters;
+  x11_workarea_fix_rotation(retv);
 
   // Name
   retv->name =
-- 
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