1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/display/util/x11/edid_parser_x11.h"
6
7 #include <X11/extensions/Xrandr.h>
8 #include <X11/Xatom.h>
9 #include <X11/Xlib.h>
10
11 #include "base/strings/string_util.h"
12 #include "ui/display/util/edid_parser.h"
13 #include "ui/gfx/x/x11_types.h"
14
15 namespace ui {
16
17 namespace {
18
IsRandRAvailable()19 bool IsRandRAvailable() {
20 int randr_version_major = 0;
21 int randr_version_minor = 0;
22 static bool is_randr_available = XRRQueryVersion(
23 gfx::GetXDisplay(), &randr_version_major, &randr_version_minor);
24 return is_randr_available;
25 }
26
27 // Get the EDID data from the |output| and stores to |edid|.
28 // Returns true if EDID property is successfully obtained. Otherwise returns
29 // false and does not touch |edid|.
GetEDIDProperty(XID output,std::vector<uint8_t> * edid)30 bool GetEDIDProperty(XID output, std::vector<uint8_t>* edid) {
31 if (!IsRandRAvailable())
32 return false;
33
34 Display* display = gfx::GetXDisplay();
35
36 static Atom edid_property = XInternAtom(
37 gfx::GetXDisplay(),
38 RR_PROPERTY_RANDR_EDID, false);
39
40 bool has_edid_property = false;
41 int num_properties = 0;
42 Atom* properties = XRRListOutputProperties(display, output, &num_properties);
43 for (int i = 0; i < num_properties; ++i) {
44 if (properties[i] == edid_property) {
45 has_edid_property = true;
46 break;
47 }
48 }
49 XFree(properties);
50 if (!has_edid_property)
51 return false;
52
53 Atom actual_type;
54 int actual_format;
55 unsigned long bytes_after;
56 unsigned long nitems = 0;
57 unsigned char* prop = NULL;
58 XRRGetOutputProperty(display,
59 output,
60 edid_property,
61 0, // offset
62 128, // length
63 false, // _delete
64 false, // pending
65 AnyPropertyType, // req_type
66 &actual_type,
67 &actual_format,
68 &nitems,
69 &bytes_after,
70 &prop);
71 DCHECK_EQ(XA_INTEGER, actual_type);
72 DCHECK_EQ(8, actual_format);
73 edid->assign(prop, prop + nitems);
74 XFree(prop);
75 return true;
76 }
77
78 // Gets some useful data from the specified output device, such like
79 // manufacturer's ID, product code, and human readable name. Returns false if it
80 // fails to get those data and doesn't touch manufacturer ID/product code/name.
81 // NULL can be passed for unwanted output parameters.
GetOutputDeviceData(XID output,uint16_t * manufacturer_id,std::string * human_readable_name)82 bool GetOutputDeviceData(XID output,
83 uint16_t* manufacturer_id,
84 std::string* human_readable_name) {
85 std::vector<uint8_t> edid;
86 if (!GetEDIDProperty(output, &edid))
87 return false;
88
89 bool result = ParseOutputDeviceData(
90 edid, manufacturer_id, human_readable_name);
91 return result;
92 }
93
94 } // namespace
95
GetDisplayId(XID output_id,uint8_t output_index,int64_t * display_id_out)96 bool GetDisplayId(XID output_id,
97 uint8_t output_index,
98 int64_t* display_id_out) {
99 std::vector<uint8_t> edid;
100 if (!GetEDIDProperty(output_id, &edid))
101 return false;
102
103 bool result = GetDisplayIdFromEDID(edid, output_index, display_id_out);
104 return result;
105 }
106
GetDisplayName(RROutput output)107 std::string GetDisplayName(RROutput output) {
108 std::string display_name;
109 GetOutputDeviceData(output, NULL, &display_name);
110 return display_name;
111 }
112
GetOutputOverscanFlag(RROutput output,bool * flag)113 bool GetOutputOverscanFlag(RROutput output, bool* flag) {
114 std::vector<uint8_t> edid;
115 if (!GetEDIDProperty(output, &edid))
116 return false;
117
118 bool found = ParseOutputOverscanFlag(edid, flag);
119 return found;
120 }
121
122 } // namespace ui
123