From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 15 Sep 2016 17:22:06 +0000 (+0300)
Subject: Get monitor names from EDID if available
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgui.git;a=commitdiff_plain;h=91d461ab8ef19ba49423dbbbe9b467ffdf0d1584

Get monitor names from EDID if available
---

diff --git a/source/graphics/x11/display.cpp b/source/graphics/x11/display.cpp
index c23f46d..a48f3f8 100644
--- a/source/graphics/x11/display.cpp
+++ b/source/graphics/x11/display.cpp
@@ -1,4 +1,5 @@
 #include <X11/Xlib.h>
+#include <X11/Xatom.h>
 #ifdef WITH_XRANDR
 #include <X11/extensions/Xrandr.h>
 #endif
@@ -111,6 +112,7 @@ Display::Display(const string &disp_name):
 		{
 			XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 			RROutput primary = XRRGetOutputPrimary(priv->display, priv->root_window);
+			Atom edid_prop = XInternAtom(priv->display, RR_PROPERTY_RANDR_EDID, true);
 
 			map<RRMode, XRRModeInfo *> modes_by_id;
 			for(int i=0; i<res->nmode; ++i)
@@ -127,6 +129,30 @@ Display::Display(const string &disp_name):
 				monitor.name.assign(output->name, output->nameLen);
 				priv->monitors.push_back(res->outputs[i]);
 
+				if(edid_prop)
+				{
+					Atom prop_type;
+					int prop_format;
+					unsigned long length;
+					unsigned long overflow;
+					unsigned char *edid = 0;
+					XRRGetOutputProperty(priv->display, res->outputs[i], edid_prop, 0, 32, false, false, XA_INTEGER, &prop_type, &prop_format, &length, &overflow, &edid);
+					if(prop_type==XA_INTEGER && prop_format==8)
+					{
+						for(unsigned j=0; j<4; ++j)
+						{
+							unsigned offset = 54+j*18;
+							if(edid[offset]==0 && edid[offset+1]==0 && edid[offset+3]==0xFC)
+							{
+								unsigned k;
+								for(k=0; (k<13 && edid[offset+5+k]!=0x0A); ++k) ;
+								monitor.name.assign(reinterpret_cast<char *>(edid+offset+5), k);
+							}
+						}
+					}
+					XFree(edid);
+				}
+
 				if(crtc)
 				{
 					monitor.desktop_rotation = rotation_from_sys(crtc->rotation);