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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/system_display/display_info_provider_win.h"
#include <windows.h>
#include <stddef.h>
#include <memory>
#include <utility>
#include "base/hash/hash.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/win_util.h"
#include "chrome/browser/extensions/system_display/display_info_provider.h"
#include "extensions/common/api/system_display.h"
#include "ui/display/display.h"
#include "ui/display/win/dpi.h"
#include "ui/display/win/screen_win.h"
#include "ui/gfx/geometry/size.h"
namespace extensions {
using api::system_display::DisplayUnitInfo;
namespace {
BOOL CALLBACK EnumMonitorCallback(HMONITOR monitor,
HDC hdc,
LPRECT rect,
LPARAM data) {
base::flat_map<std::string, std::string>* device_id_to_name =
reinterpret_cast<base::flat_map<std::string, std::string>*>(data);
DCHECK(device_id_to_name);
DisplayUnitInfo unit;
MONITORINFOEX monitor_info = {};
monitor_info.cbSize = sizeof(monitor_info);
GetMonitorInfo(monitor, &monitor_info);
DISPLAY_DEVICE device;
device.cb = sizeof(device);
if (!EnumDisplayDevices(monitor_info.szDevice, 0, &device, 0)) {
return FALSE;
}
std::string id = base::NumberToString(
display::win::GetScreenWin()->DisplayIdFromMonitorInfo(monitor_info));
(*device_id_to_name)[id] = base::WideToUTF8(device.DeviceString);
return TRUE;
}
} // namespace
DisplayInfoProviderWin::DisplayInfoProviderWin() = default;
void DisplayInfoProviderWin::UpdateDisplayUnitInfoForPlatform(
const std::vector<display::Display>& displays,
DisplayUnitInfoList& units) const {
base::flat_map<std::string, std::string> device_id_to_name;
EnumDisplayMonitors(nullptr, nullptr, EnumMonitorCallback,
reinterpret_cast<LPARAM>(&device_id_to_name));
// `displays` and `units` are in the same order. Each unit has an id
// which is the string representation of the corresponding display's id.
for (size_t display_index = 0; display_index < displays.size();
display_index++) {
auto it = device_id_to_name.find(units[display_index].id);
if (it != device_id_to_name.end()) {
units[display_index].name = it->second;
float device_scale_factor = displays[display_index].device_scale_factor();
int dpi = display::win::GetDPIFromScalingFactor(device_scale_factor);
units[display_index].dpi_x = dpi;
units[display_index].dpi_y = dpi;
}
}
}
std::unique_ptr<DisplayInfoProvider> CreateChromeDisplayInfoProvider() {
return std::make_unique<DisplayInfoProviderWin>();
}
} // namespace extensions
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