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
15namespace ui {
16
17namespace {
18
19bool 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|.
30bool 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.
82bool 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
96bool 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
107std::string GetDisplayName(RROutput output) {
108  std::string display_name;
109  GetOutputDeviceData(output, NULL, &display_name);
110  return display_name;
111}
112
113bool 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