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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/win/display_info.h"
#include <string.h>
#include "base/compiler_specific.h"
#include "base/hash/hash.h"
#include "base/metrics/histogram_functions.h"
#include "base/rand_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/display/win/display_config_helper.h"
#include "ui/display/win/screen_win_headless.h"
namespace display::win::internal {
namespace {
// Return a string view from a fixed-length array representing a string, up
// until the first nul terminator, if any.
template <size_t N>
std::wstring_view FixedArrayToStringView(
const std::wstring_view::value_type (&str)[N]) {
return std::wstring_view(str, UNSAFE_TODO(::wcsnlen(str, N)));
}
} // namespace
DisplayInfo::DisplayInfo(
const MONITORINFOEX& monitor_info,
float device_scale_factor,
float sdr_white_level,
Display::Rotation rotation,
float display_frequency,
const gfx::Vector2dF& pixels_per_inch,
DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY output_technology,
const std::string& label)
: id_(DisplayIdFromMonitorInfo(monitor_info)),
screen_rect_(monitor_info.rcMonitor),
screen_work_rect_(monitor_info.rcWork),
device_scale_factor_(device_scale_factor),
sdr_white_level_(sdr_white_level),
rotation_(rotation),
display_frequency_(display_frequency),
pixels_per_inch_(pixels_per_inch),
output_technology_(output_technology),
label_(label),
device_name_(FixedArrayToStringView(monitor_info.szDevice)) {}
DisplayInfo::DisplayInfo(
int64_t id,
const MONITORINFOEX& monitor_info,
float device_scale_factor,
float sdr_white_level,
Display::Rotation rotation,
float display_frequency,
const gfx::Vector2dF& pixels_per_inch,
DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY output_technology,
const std::string& label)
: id_(id),
screen_rect_(monitor_info.rcMonitor),
screen_work_rect_(monitor_info.rcWork),
device_scale_factor_(device_scale_factor),
sdr_white_level_(sdr_white_level),
rotation_(rotation),
display_frequency_(display_frequency),
pixels_per_inch_(pixels_per_inch),
output_technology_(output_technology),
label_(label),
device_name_(FixedArrayToStringView(monitor_info.szDevice)) {
CHECK(VerifyHeadlessDisplayDeviceName(id, monitor_info));
}
DisplayInfo::DisplayInfo(const DisplayInfo& other) = default;
DisplayInfo::~DisplayInfo() = default;
// static
int64_t DisplayInfo::DisplayIdFromMonitorInfo(const MONITORINFOEX& monitor) {
// Derive a display ID from the adapter ID and per-adapter monitor ID.
// This seems to be broadly available, unique for each monitor of the device,
// and stable across display configuration changes, but not device restarts.
std::optional<DISPLAYCONFIG_PATH_INFO> config_path =
GetDisplayConfigPathInfo(monitor);
// Record if DISPLAYCONFIG_PATH_INFO is available or not.
// TODO(anandrv): Remove the non-subsampled metric when there is enough data
// from the subsampled metric.
base::UmaHistogramBoolean("Windows.LegacyDisplayIdAlgorithm",
!config_path.has_value());
if (base::ShouldRecordSubsampledMetric(0.01)) {
base::UmaHistogramBoolean("Windows.LegacyDisplayIdAlgorithm2",
!config_path.has_value());
}
if (config_path.has_value()) {
return static_cast<int64_t>(base::PersistentHash(base::StringPrintf(
"%lu/%li/%u", config_path->targetInfo.adapterId.LowPart,
config_path->targetInfo.adapterId.HighPart,
config_path->targetInfo.id)));
}
// MONITORINFOEX::szDevice is a plausible backup with some notable drawbacks.
// This value (e.g. "\\.\DISPLAY1") may change when adding/removing displays,
// and even be reassigned between physical monitors during those changes,
// which can cause subtle unexpected behavior.
return static_cast<int64_t>(base::PersistentHash(
base::WideToUTF8(FixedArrayToStringView(monitor.szDevice))));
}
bool DisplayInfo::operator==(const DisplayInfo& rhs) const = default;
} // namespace display::win::internal
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