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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_atom_cache.h"
#include "ui/gfx/x/x11_types.h"
namespace display {
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) {
Display* display = gfx::GetXDisplay();
if (!display)
return false;
if (!IsRandRAvailable())
return false;
Atom edid_property = gfx::GetAtom(RR_PROPERTY_RANDR_EDID);
bool has_edid_property = false;
int num_properties = 0;
gfx::XScopedPtr<Atom[]> properties(
XRRListOutputProperties(display, output, &num_properties));
for (int i = 0; i < num_properties; ++i) {
if (properties[i] == edid_property) {
has_edid_property = true;
break;
}
}
if (!has_edid_property)
return false;
Atom actual_type;
int actual_format;
unsigned long bytes_after;
unsigned long nitems = 0;
unsigned char* prop = nullptr;
XRRGetOutputProperty(display,
output,
edid_property,
0, // offset
128, // length
false, // _delete
false, // pending
AnyPropertyType, // req_type
&actual_type,
&actual_format,
&nitems,
&bytes_after,
&prop);
DCHECK_EQ(XA_INTEGER, actual_type);
DCHECK_EQ(8, actual_format);
edid->assign(prop, prop + nitems);
XFree(prop);
return true;
}
} // namespace
EDIDParserX11::EDIDParserX11(XID output_id)
: output_id_(output_id) {
GetEDIDProperty(output_id_, &edid_);
}
EDIDParserX11::~EDIDParserX11() {
}
bool EDIDParserX11::GetDisplayId(uint8_t index, int64_t* out_display_id) const {
if (edid_.empty())
return false;
return GetDisplayIdFromEDID(edid_, index, out_display_id, nullptr);
}
std::string EDIDParserX11::GetDisplayName() const {
std::string display_name;
ParseOutputDeviceData(edid_, nullptr, nullptr, &display_name, nullptr,
nullptr);
return display_name;
}
bool EDIDParserX11::GetOutputOverscanFlag(bool* out_flag) const {
if (edid_.empty())
return false;
return ParseOutputOverscanFlag(edid_, out_flag);
}
} // namespace display
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