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// Copyright 2015 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 "components/metrics/ui/screen_info_metrics_provider.h"
#include "build/build_config.h"
#include "components/metrics/proto/system_profile.pb.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
namespace metrics {
#if defined(OS_WIN)
#include <windows.h>
namespace {
struct ScreenDPIInformation {
double max_dpi_x;
double max_dpi_y;
};
// Called once for each connected monitor.
BOOL CALLBACK GetMonitorDPICallback(HMONITOR, HDC hdc, LPRECT, LPARAM dwData) {
const double kMillimetersPerInch = 25.4;
ScreenDPIInformation* screen_info =
reinterpret_cast<ScreenDPIInformation*>(dwData);
// Size of screen, in mm.
DWORD size_x = GetDeviceCaps(hdc, HORZSIZE);
DWORD size_y = GetDeviceCaps(hdc, VERTSIZE);
double dpi_x = (size_x > 0) ?
GetDeviceCaps(hdc, HORZRES) / (size_x / kMillimetersPerInch) : 0;
double dpi_y = (size_y > 0) ?
GetDeviceCaps(hdc, VERTRES) / (size_y / kMillimetersPerInch) : 0;
screen_info->max_dpi_x = std::max(dpi_x, screen_info->max_dpi_x);
screen_info->max_dpi_y = std::max(dpi_y, screen_info->max_dpi_y);
return TRUE;
}
void WriteScreenDPIInformationProto(SystemProfileProto::Hardware* hardware) {
HDC desktop_dc = GetDC(NULL);
if (desktop_dc) {
ScreenDPIInformation si = {0, 0};
if (EnumDisplayMonitors(desktop_dc, NULL, GetMonitorDPICallback,
reinterpret_cast<LPARAM>(&si))) {
hardware->set_max_dpi_x(si.max_dpi_x);
hardware->set_max_dpi_y(si.max_dpi_y);
}
ReleaseDC(GetDesktopWindow(), desktop_dc);
}
}
} // namespace
#endif // defined(OS_WIN)
ScreenInfoMetricsProvider::ScreenInfoMetricsProvider() {
}
ScreenInfoMetricsProvider::~ScreenInfoMetricsProvider() {
}
void ScreenInfoMetricsProvider::ProvideSystemProfileMetrics(
SystemProfileProto* system_profile_proto) {
SystemProfileProto::Hardware* hardware =
system_profile_proto->mutable_hardware();
const gfx::Size display_size = GetScreenSize();
hardware->set_primary_screen_width(display_size.width());
hardware->set_primary_screen_height(display_size.height());
hardware->set_primary_screen_scale_factor(GetScreenDeviceScaleFactor());
hardware->set_screen_count(GetScreenCount());
#if defined(OS_WIN)
WriteScreenDPIInformationProto(hardware);
#endif
}
gfx::Size ScreenInfoMetricsProvider::GetScreenSize() const {
return display::Screen::GetScreen()->GetPrimaryDisplay().GetSizeInPixel();
}
float ScreenInfoMetricsProvider::GetScreenDeviceScaleFactor() const {
return display::Screen::GetScreen()
->GetPrimaryDisplay()
.device_scale_factor();
}
int ScreenInfoMetricsProvider::GetScreenCount() const {
return display::Screen::GetScreen()->GetNumDisplays();
}
} // namespace metrics
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