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#include "envmetrics.h"
#include "env.h"
#include <Windows.h>
#include <shellscalingapi.h>
#include <log.h>
#include <utility.h>
namespace env
{
using namespace MOBase;
class DisplayEnumerator
{
public:
DisplayEnumerator()
: m_GetDpiForMonitor(nullptr)
{
m_shcore.reset(LoadLibraryW(L"Shcore.dll"));
if (m_shcore) {
// windows 8.1+ only
m_GetDpiForMonitor = reinterpret_cast<GetDpiForMonitorFunction*>(
GetProcAddress(m_shcore.get(), "GetDpiForMonitor"));
}
// gets all monitors and the device they're running on
getDisplayDevices();
}
std::vector<Metrics::Display>&& displays() &&
{
return std::move(m_displays);
}
const std::vector<Metrics::Display>& displays() const &
{
return m_displays;
}
private:
using GetDpiForMonitorFunction =
HRESULT WINAPI (HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*);
std::unique_ptr<HINSTANCE, LibraryFreer> m_shcore;
GetDpiForMonitorFunction* m_GetDpiForMonitor;
std::vector<Metrics::Display> m_displays;
void getDisplayDevices()
{
// don't bother if it goes over 100
for (int i=0; i<100; ++i) {
DISPLAY_DEVICEW device = {};
device.cb = sizeof(device);
if (!EnumDisplayDevicesW(nullptr, i, &device, 0)) {
// no more
break;
}
// EnumDisplayDevices() seems to be returning a lot of devices that are
// not actually monitors, but those don't have the
// DISPLAY_DEVICE_ATTACHED_TO_DESKTOP bit set
if ((device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) == 0) {
continue;
}
m_displays.push_back(createDisplay(device));
}
}
Metrics::Display createDisplay(const DISPLAY_DEVICEW& device)
{
Metrics::Display d;
d.adapter = QString::fromWCharArray(device.DeviceString);
d.monitor = QString::fromWCharArray(device.DeviceName);
d.primary = (device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE);
getDisplaySettings(device.DeviceName, d);
getDpi(d);
return d;
}
void getDisplaySettings(const wchar_t* monitorName, Metrics::Display& d)
{
DEVMODEW dm = {};
dm.dmSize = sizeof(dm);
if (!EnumDisplaySettingsW(monitorName, ENUM_CURRENT_SETTINGS, &dm)) {
log::error("EnumDisplaySettings() failed for '{}'", d.monitor);
return;
}
// all these fields should be available
if (dm.dmFields & DM_DISPLAYFREQUENCY) {
d.refreshRate = dm.dmDisplayFrequency;
}
if (dm.dmFields & DM_PELSWIDTH) {
d.resX = dm.dmPelsWidth;
}
if (dm.dmFields & DM_PELSHEIGHT) {
d.resY = dm.dmPelsHeight;
}
}
void getDpi(Metrics::Display& d)
{
if (!m_GetDpiForMonitor) {
// this happens on windows 7, get the desktop dpi instead
getDesktopDpi(d);
return;
}
// there's no way to get an HMONITOR from a device name, so all monitors
// will have to be enumerated and their name checked
HMONITOR hm = findMonitor(d.monitor);
if (!hm) {
log::error("can't get dpi for monitor '{}', not found", d.monitor);
return;
}
UINT dpiX=0, dpiY=0;
const auto r = m_GetDpiForMonitor(hm, MDT_EFFECTIVE_DPI, &dpiX, &dpiY);
if (FAILED(r)) {
log::error(
"GetDpiForMonitor() failed for '{}', {}",
d.monitor, formatSystemMessageQ(r));
return;
}
// dpiX and dpiY are always identical, as per the documentation
d.dpi = dpiX;
}
void getDesktopDpi(Metrics::Display& d)
{
// desktop dc
HDC dc = GetDC(0);
if (!dc) {
const auto e = GetLastError();
log::error("can't get desktop DC, {}", formatSystemMessageQ(e));
return;
}
d.dpi = GetDeviceCaps(dc, LOGPIXELSX);
ReleaseDC(0, dc);
}
HMONITOR findMonitor(const QString& name)
{
// passed to the enumeration callback
struct Data
{
DisplayEnumerator* self;
QString name;
HMONITOR hm;
};
Data data = {this, name, 0};
// for each monitor
EnumDisplayMonitors(0, nullptr, [](HMONITOR hm, HDC, RECT*, LPARAM lp) {
auto& data = *reinterpret_cast<Data*>(lp);
MONITORINFOEX mi = {};
mi.cbSize = sizeof(mi);
// monitor info will include the name
if (!GetMonitorInfoW(hm, &mi)) {
const auto e = GetLastError();
log::error(
"GetMonitorInfo() failed for '{}', {}",
data.name, formatSystemMessageQ(e));
// error for this monitor, but continue
return TRUE;
}
if (QString::fromWCharArray(mi.szDevice) == data.name) {
// found, stop
data.hm = hm;
return FALSE;
}
// not found, continue to the next monitor
return TRUE;
}, reinterpret_cast<LPARAM>(&data));
return data.hm;
}
};
Metrics::Metrics()
{
m_displays = DisplayEnumerator().displays();
}
const std::vector<Metrics::Display>& Metrics::displays() const
{
return m_displays;
}
QString Metrics::Display::toString() const
{
return QString("%1*%2 %3hz dpi=%4 on %5%6")
.arg(resX)
.arg(resY)
.arg(refreshRate)
.arg(dpi)
.arg(adapter)
.arg(primary ? " (primary)" : "");
}
} // namespace
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