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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/util/x11/edid_parser_x11.h"
#include <X11/extensions/Xrandr.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include "base/strings/string_util.h"
#include "ui/display/util/edid_parser.h"
#include "ui/gfx/x/x11_types.h"
namespace ui {
namespace {
bool IsRandRAvailable() {
int randr_version_major = 0;
int randr_version_minor = 0;
static bool is_randr_available = XRRQueryVersion(
gfx::GetXDisplay(), &randr_version_major, &randr_version_minor);
return is_randr_available;
// Get the EDID data from the |output| and stores to |edid|.
// Returns true if EDID property is successfully obtained. Otherwise returns
// false and does not touch |edid|.
bool GetEDIDProperty(XID output, std::vector<uint8_t>* edid) {
if (!IsRandRAvailable())
return false;
Display* display = gfx::GetXDisplay();
static Atom edid_property = XInternAtom(
bool has_edid_property = false;
int num_properties = 0;
Atom* properties = XRRListOutputProperties(display, output, &num_properties);
for (int i = 0; i < num_properties; ++i) {
if (properties[i] == edid_property) {
has_edid_property = true;
if (!has_edid_property)
return false;
Atom actual_type;
int actual_format;
unsigned long bytes_after;
unsigned long nitems = 0;
unsigned char* prop = NULL;
0, // offset
128, // length
false, // _delete
false, // pending
AnyPropertyType, // req_type
DCHECK_EQ(XA_INTEGER, actual_type);
DCHECK_EQ(8, actual_format);
edid->assign(prop, prop + nitems);
return true;
// Gets some useful data from the specified output device, such like
// manufacturer's ID, product code, and human readable name. Returns false if it
// fails to get those data and doesn't touch manufacturer ID/product code/name.
// NULL can be passed for unwanted output parameters.
bool GetOutputDeviceData(XID output,
uint16_t* manufacturer_id,
std::string* human_readable_name) {
std::vector<uint8_t> edid;
if (!GetEDIDProperty(output, &edid))
return false;
bool result = ParseOutputDeviceData(
edid, manufacturer_id, human_readable_name);
return result;
} // namespace
bool GetDisplayId(XID output_id,
uint8_t output_index,
int64_t* display_id_out) {
std::vector<uint8_t> edid;
if (!GetEDIDProperty(output_id, &edid))
return false;
bool result = GetDisplayIdFromEDID(edid, output_index, display_id_out);
return result;
std::string GetDisplayName(RROutput output) {
std::string display_name;
GetOutputDeviceData(output, NULL, &display_name);
return display_name;
bool GetOutputOverscanFlag(RROutput output, bool* flag) {
std::vector<uint8_t> edid;
if (!GetEDIDProperty(output, &edid))
return false;
bool found = ParseOutputOverscanFlag(edid, flag);
return found;
} // namespace ui