Added showing the Output name along with the details (if any).

xcb_read/Understanding_XRandr.md

@@ -40,5 +40,15 @@ And the following facts:
   Work](https://www.x.org/wiki/Development/Documentation/HowVideoCardsWork/)... [TK]
 - An output can have multiple CRTCs... but usually has only one.
 
+Unresolved questions ... 
+
+- If the output encapsulates the _whole_ of screen (and the root window), when
+  we rotate the output who does coordinate remapping? I believe that's the
+  responsibility of the window manager. But if that's true, then what are the
+  implications for image viewers?
+  
+- If the output encapsulates only a subwindow of the whole, what is the
+  responsibility of the window manager when the new dimensions fit easily within
+  the screen as a whole?
   
   

xcb_read/src/xrandr.cpp

@@ -33,9 +33,20 @@ void display_one_output(xcb_connection_t* connection, xcb_randr_get_output_info_
                         xcb_timestamp_t timestamp) {
     xcb_randr_get_crtc_info_reply_t* crtc = xcb_randr_get_crtc_info_reply(
         connection, xcb_randr_get_crtc_info(connection, output->crtc, timestamp), NULL);
+
+    // Note: This is part of the output structure natively; it's just not
+    // automagically exposed. (Opaque structures suck.) But it's both accessible
+    // and null-terminated, so it's relatively safe to use this way, and it does
+    // not require free() at the end.
+    auto name = xcb_randr_get_output_info_name(output);
+    if (name) {
+        std::cout << "DISPLAY: " << name << std::endl;
+    }
+
     if (!crtc) {
         return;
     }
+
     display_one_crtc(crtc);
     free(crtc);
 }