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framelesshelper/utilities_win32.cpp

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/*
* MIT License
*
* Copyright (C) 2022 by wangwenx190 (Yuhang Zhao)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "utilities.h"
#include <QtCore/qdebug.h>
#include <QtCore/private/qsystemlibrary_p.h>
#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
#include <QtCore/qoperatingsystemversion.h>
#else
#include <QtCore/qsysinfo.h>
#endif
#include <QtGui/qguiapplication.h>
#include <QtGui/qpa/qplatformwindow.h>
#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
#include <QtGui/qpa/qplatformnativeinterface.h>
#else
#include <QtGui/qpa/qplatformwindow_p.h>
#endif
#include "qwinregistry_p.h"
#include "framelesshelper_windows.h"
Q_DECLARE_METATYPE(QMargins)
FRAMELESSHELPER_BEGIN_NAMESPACE
#if (QT_VERSION < QT_VERSION_CHECK(5, 9, 0))
[[nodiscard]] static inline bool isWindowsVersionOrGreater(const DWORD dwMajor, const DWORD dwMinor, const DWORD dwBuild)
{
OSVERSIONINFOEXW osvi;
SecureZeroMemory(&osvi, sizeof(osvi));
osvi.dwOSVersionInfoSize = sizeof(osvi);
osvi.dwMajorVersion = dwMajor;
osvi.dwMinorVersion = dwMinor;
osvi.dwBuildNumber = dwBuild;
DWORDLONG dwlConditionMask = 0;
const auto op = VER_GREATER_EQUAL;
VER_SET_CONDITION(dwlConditionMask, VER_MAJORVERSION, op);
VER_SET_CONDITION(dwlConditionMask, VER_MINORVERSION, op);
VER_SET_CONDITION(dwlConditionMask, VER_BUILDNUMBER, op);
return (VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION | VER_BUILDNUMBER, dwlConditionMask) != FALSE);
}
#endif
[[nodiscard]] static inline bool isWin10RS5OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(6, 3, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10_1809);
#elif (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 17763));
#else
static const bool result = isWindowsVersionOrGreater(10, 0, 17763);
#endif
return result;
}
[[nodiscard]] static inline bool isWin1019H1OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(6, 3, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10_1903);
#elif (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 18362));
#else
static const bool result = isWindowsVersionOrGreater(10, 0, 18362);
#endif
return result;
}
[[nodiscard]] static inline QString __getSystemErrorMessage(const QString &function, const DWORD code)
{
Q_ASSERT(!function.isEmpty());
if (function.isEmpty()) {
return {};
}
if (code == ERROR_SUCCESS) {
return {};
}
LPWSTR buf = nullptr;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), reinterpret_cast<LPWSTR>(&buf), 0, nullptr) == 0) {
return {};
}
const QString message = QStringLiteral("Function %1() failed with error code %2: %3.")
.arg(function, QString::number(code), QString::fromWCharArray(buf));
LocalFree(buf);
return message;
}
[[nodiscard]] static inline QString __getSystemErrorMessage(const QString &function, const HRESULT hr)
{
Q_ASSERT(!function.isEmpty());
if (function.isEmpty()) {
return {};
}
if (SUCCEEDED(hr)) {
return {};
}
const DWORD dwError = HRESULT_CODE(hr);
return __getSystemErrorMessage(function, dwError);
}
bool Utilities::isWin8OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8);
#else
static const bool result = (QSysInfo::WindowsVersion >= QSysInfo::WV_WINDOWS8);
#endif
return result;
}
bool Utilities::isWin8Point1OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows8_1);
#else
static const bool result = (QSysInfo::WindowsVersion >= QSysInfo::WV_WINDOWS8_1);
#endif
return result;
}
bool Utilities::isWin10OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10);
#else
static const bool result = (QSysInfo::WindowsVersion >= QSysInfo::WV_WINDOWS10);
#endif
return result;
}
bool Utilities::isWin11OrGreater()
{
#if (QT_VERSION >= QT_VERSION_CHECK(6, 3, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows11);
#elif (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
static const bool result = (QOperatingSystemVersion::current() >= QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 22000));
#else
static const bool result = isWindowsVersionOrGreater(10, 0, 22000);
#endif
return result;
}
bool Utilities::isDwmCompositionAvailable()
{
// DWM composition is always enabled and can't be disabled since Windows 8.
if (isWin8OrGreater()) {
return true;
}
const auto resultFromRegistry = []() -> bool {
QWinRegistryKey registry(HKEY_CURRENT_USER, QString::fromUtf8(kDwmRegistryKey));
const auto result = registry.dwordValue(QStringLiteral("Composition"));
return (result.second && (result.first != 0));
};
static const auto pDwmIsCompositionEnabled =
reinterpret_cast<HRESULT(WINAPI *)(BOOL *)>(QSystemLibrary::resolve(QStringLiteral("dwmapi"), "DwmIsCompositionEnabled"));
if (!pDwmIsCompositionEnabled) {
return resultFromRegistry();
}
BOOL enabled = FALSE;
const HRESULT hr = pDwmIsCompositionEnabled(&enabled);
if (FAILED(hr)) {
qWarning() << __getSystemErrorMessage(QStringLiteral("DwmIsCompositionEnabled"), hr);
return resultFromRegistry();
}
return (enabled != FALSE);
}
int Utilities::getSystemMetric(const QWindow *window, const SystemMetric metric, const bool dpiScale, const bool forceSystemValue)
{
Q_ASSERT(window);
if (!window) {
return 0;
}
const qreal devicePixelRatio = window->devicePixelRatio();
const qreal scaleFactor = (dpiScale ? devicePixelRatio : 1.0);
switch (metric) {
case SystemMetric::ResizeBorderThickness: {
const int resizeBorderThickness = window->property(Constants::kResizeBorderThicknessFlag).toInt();
if ((resizeBorderThickness > 0) && !forceSystemValue) {
return qRound(static_cast<qreal>(resizeBorderThickness) * scaleFactor);
} else {
const int result = GetSystemMetrics(SM_CXSIZEFRAME) + GetSystemMetrics(SM_CXPADDEDBORDER);
if (result > 0) {
if (dpiScale) {
return result;
} else {
return qRound(static_cast<qreal>(result) / devicePixelRatio);
}
} else {
qWarning() << getSystemErrorMessage(QStringLiteral("GetSystemMetrics"));
// The padded border will disappear if DWM composition is disabled.
const int defaultResizeBorderThickness = (isDwmCompositionAvailable() ? kDefaultResizeBorderThicknessAero : kDefaultResizeBorderThicknessClassic);
if (dpiScale) {
return qRound(static_cast<qreal>(defaultResizeBorderThickness) * devicePixelRatio);
} else {
return defaultResizeBorderThickness;
}
}
}
}
case SystemMetric::CaptionHeight: {
const int captionHeight = window->property(Constants::kCaptionHeightFlag).toInt();
if ((captionHeight > 0) && !forceSystemValue) {
return qRound(static_cast<qreal>(captionHeight) * scaleFactor);
} else {
const int result = GetSystemMetrics(SM_CYCAPTION);
if (result > 0) {
if (dpiScale) {
return result;
} else {
return qRound(static_cast<qreal>(result) / devicePixelRatio);
}
} else {
qWarning() << getSystemErrorMessage(QStringLiteral("GetSystemMetrics"));
if (dpiScale) {
return qRound(static_cast<qreal>(kDefaultCaptionHeight) * devicePixelRatio);
} else {
return kDefaultCaptionHeight;
}
}
}
}
case SystemMetric::TitleBarHeight: {
const int titleBarHeight = window->property(Constants::kTitleBarHeightFlag).toInt();
if ((titleBarHeight > 0) && !forceSystemValue) {
return qRound(static_cast<qreal>(titleBarHeight) * scaleFactor);
} else {
const int captionHeight = getSystemMetric(window,SystemMetric::CaptionHeight,
dpiScale, forceSystemValue);
const int resizeBorderThickness = getSystemMetric(window, SystemMetric::ResizeBorderThickness,
dpiScale, forceSystemValue);
return (((window->windowState() == Qt::WindowMaximized)
|| (window->windowState() == Qt::WindowFullScreen))
? captionHeight : (captionHeight + resizeBorderThickness));
}
}
}
return 0;
}
void Utilities::triggerFrameChange(const WId winId)
{
Q_ASSERT(winId);
if (!winId) {
return;
}
const auto hwnd = reinterpret_cast<HWND>(winId);
static constexpr const UINT flags = (SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER);
if (SetWindowPos(hwnd, nullptr, 0, 0, 0, 0, flags) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("SetWindowPos"));
}
}
void Utilities::updateFrameMargins(const WId winId, const bool reset)
{
// DwmExtendFrameIntoClientArea() will always fail if DWM composition is disabled.
// No need to try in this case.
if (!isDwmCompositionAvailable()) {
return;
}
Q_ASSERT(winId);
if (!winId) {
return;
}
static const auto pDwmExtendFrameIntoClientArea =
reinterpret_cast<HRESULT(WINAPI *)(HWND, const MARGINS *)>(QSystemLibrary::resolve(QStringLiteral("dwmapi"), "DwmExtendFrameIntoClientArea"));
if (!pDwmExtendFrameIntoClientArea) {
return;
}
const auto hwnd = reinterpret_cast<HWND>(winId);
const MARGINS margins = reset ? MARGINS{0, 0, 0, 0} : MARGINS{1, 1, 1, 1};
const HRESULT hr = pDwmExtendFrameIntoClientArea(hwnd, &margins);
if (FAILED(hr)) {
qWarning() << __getSystemErrorMessage(QStringLiteral("DwmExtendFrameIntoClientArea"), hr);
return;
}
triggerFrameChange(winId);
}
void Utilities::updateQtFrameMargins(QWindow *window, const bool enable)
{
Q_ASSERT(window);
if (!window) {
return;
}
const int resizeBorderThickness = enable ? Utilities::getSystemMetric(window, SystemMetric::ResizeBorderThickness, true, true) : 0;
const int titleBarHeight = enable ? Utilities::getSystemMetric(window, SystemMetric::TitleBarHeight, true, true) : 0;
const QMargins margins = {-resizeBorderThickness, -titleBarHeight, -resizeBorderThickness, -resizeBorderThickness};
const QVariant marginsVar = QVariant::fromValue(margins);
window->setProperty("_q_windowsCustomMargins", marginsVar);
#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
QPlatformWindow *platformWindow = window->handle();
if (platformWindow) {
QGuiApplication::platformNativeInterface()->setWindowProperty(platformWindow, QStringLiteral("WindowsCustomMargins"), marginsVar);
} else {
qWarning() << "Failed to retrieve the platform window.";
return;
}
#else
auto *platformWindow = dynamic_cast<QNativeInterface::Private::QWindowsWindow *>(
window->handle());
if (platformWindow) {
platformWindow->setCustomMargins(margins);
} else {
qWarning() << "Failed to retrieve the platform window.";
return;
}
#endif
triggerFrameChange(window->winId());
}
QString Utilities::getSystemErrorMessage(const QString &function)
{
Q_ASSERT(!function.isEmpty());
if (function.isEmpty()) {
return {};
}
const DWORD code = GetLastError();
if (code == ERROR_SUCCESS) {
return {};
}
return __getSystemErrorMessage(function, code);
}
QColor Utilities::getColorizationColor()
{
const auto resultFromRegistry = []() -> QColor {
QWinRegistryKey registry(HKEY_CURRENT_USER, QString::fromUtf8(kDwmRegistryKey));
const auto result = registry.dwordValue(QStringLiteral("ColorizationColor"));
return (result.second ? QColor::fromRgba(result.first) : Qt::darkGray);
};
static const auto pDwmGetColorizationColor =
reinterpret_cast<HRESULT(WINAPI *)(DWORD *, BOOL *)>(QSystemLibrary::resolve(QStringLiteral("dwmapi"), "DwmGetColorizationColor"));
if (!pDwmGetColorizationColor) {
return resultFromRegistry();
}
DWORD color = 0;
BOOL opaque = FALSE;
const HRESULT hr = pDwmGetColorizationColor(&color, &opaque);
if (FAILED(hr)) {
qWarning() << __getSystemErrorMessage(QStringLiteral("DwmGetColorizationColor"), hr);
return resultFromRegistry();
}
return QColor::fromRgba(color);
}
int Utilities::getWindowVisibleFrameBorderThickness(const WId winId)
{
Q_ASSERT(winId);
if (!winId) {
return 1;
}
if (!isWin10OrGreater()) {
return 1;
}
static const auto pDwmGetWindowAttribute =
reinterpret_cast<HRESULT(WINAPI *)(HWND, DWORD, PVOID, DWORD)>(QSystemLibrary::resolve(QStringLiteral("dwmapi"), "DwmGetWindowAttribute"));
if (!pDwmGetWindowAttribute) {
return 1;
}
const auto hWnd = reinterpret_cast<HWND>(winId);
UINT value = 0;
const HRESULT hr = pDwmGetWindowAttribute(hWnd, _DWMWA_VISIBLE_FRAME_BORDER_THICKNESS, &value, sizeof(value));
if (SUCCEEDED(hr)) {
const QWindow *w = findWindow(winId);
return static_cast<int>(qRound(static_cast<qreal>(value) / (w ? w->devicePixelRatio() : 1.0)));
} else {
// We just eat this error because this enum value was introduced in a very
// late Windows 10 version, so querying it's value will always result in
// a "parameter error" (code: 87) on systems before that value was introduced.
}
return 1;
}
bool Utilities::shouldAppsUseDarkMode()
{
// The dark mode was introduced in Windows 10 1809.
if (!isWin10RS5OrGreater()) {
return false;
}
const auto resultFromRegistry = []() -> bool {
QWinRegistryKey registry(HKEY_CURRENT_USER, QString::fromUtf8(kPersonalizeRegistryKey));
const auto result = registry.dwordValue(QStringLiteral("AppsUseLightTheme"));
return (result.second && (result.first == 0));
};
// Starting from Windows 10 1903, ShouldAppsUseDarkMode() always return "TRUE"
// (actually, a random non-zero number at runtime), so we can't use it due to
// this unreliability. In this case, we just simply read the user's setting from
// the registry instead, it's not elegant but at least it works well.
if (isWin1019H1OrGreater()) {
return resultFromRegistry();
} else {
static const auto pShouldAppsUseDarkMode =
reinterpret_cast<BOOL(WINAPI *)(VOID)>(QSystemLibrary::resolve(QStringLiteral("uxtheme"), MAKEINTRESOURCEA(132)));
return (pShouldAppsUseDarkMode ? (pShouldAppsUseDarkMode() != FALSE) : resultFromRegistry());
}
}
ColorizationArea Utilities::getColorizationArea()
{
if (!isWin10OrGreater()) {
return ColorizationArea::None;
}
const QString keyName = QStringLiteral("ColorPrevalence");
QWinRegistryKey themeRegistry(HKEY_CURRENT_USER, QString::fromUtf8(kPersonalizeRegistryKey));
const auto themeValue = themeRegistry.dwordValue(keyName);
QWinRegistryKey dwmRegistry(HKEY_CURRENT_USER, QString::fromUtf8(kDwmRegistryKey));
const auto dwmValue = dwmRegistry.dwordValue(keyName);
const bool theme = themeValue.second && (themeValue.first != 0);
const bool dwm = dwmValue.second && (dwmValue.first != 0);
if (theme && dwm) {
return ColorizationArea::All;
} else if (theme) {
return ColorizationArea::StartMenu_TaskBar_ActionCenter;
} else if (dwm) {
return ColorizationArea::TitleBar_WindowBorder;
}
return ColorizationArea::None;
}
bool Utilities::isThemeChanged(const void *data)
{
Q_ASSERT(data);
if (!data) {
return false;
}
const auto msg = static_cast<const MSG *>(data);
if (msg->message == WM_THEMECHANGED) {
return true;
} else if (msg->message == WM_DWMCOLORIZATIONCOLORCHANGED) {
return true;
} else if (msg->message == WM_SETTINGCHANGE) {
if ((msg->wParam == 0) && (_wcsicmp(reinterpret_cast<LPCWSTR>(msg->lParam), L"ImmersiveColorSet") == 0)) {
return true;
}
}
return false;
}
bool Utilities::isSystemMenuRequested(const void *data, QPointF *pos)
{
Q_ASSERT(data);
if (!data) {
return false;
}
bool result = false;
const auto msg = static_cast<const MSG *>(data);
if (msg->message == WM_NCRBUTTONUP) {
if (msg->wParam == HTCAPTION) {
result = true;
}
} else if (msg->message == WM_SYSCOMMAND) {
const WPARAM filteredWParam = (msg->wParam & 0xFFF0);
if ((filteredWParam == SC_KEYMENU) && (msg->lParam == VK_SPACE)) {
result = true;
}
} else if (msg->message == WM_CONTEXTMENU) {
//
}
if (result) {
if (pos) {
*pos = [msg](){
const POINT nativePos = {GET_X_LPARAM(msg->lParam), GET_Y_LPARAM(msg->lParam)};
return QPointF(static_cast<qreal>(nativePos.x), static_cast<qreal>(nativePos.y));
}();
}
}
return result;
}
bool Utilities::showSystemMenu(const WId winId, const QPointF &pos)
{
Q_ASSERT(winId);
if (!winId) {
return false;
}
const auto hWnd = reinterpret_cast<HWND>(winId);
const HMENU menu = GetSystemMenu(hWnd, FALSE);
if (!menu) {
qWarning() << getSystemErrorMessage(QStringLiteral("GetSystemMenu"));
return false;
}
// Update the options based on window state.
MENUITEMINFOW mii;
SecureZeroMemory(&mii, sizeof(mii));
mii.cbSize = sizeof(mii);
mii.fMask = MIIM_STATE;
mii.fType = MFT_STRING;
const auto setState = [&mii, menu](const UINT item, const bool enabled) -> bool {
mii.fState = (enabled ? MF_ENABLED : MF_DISABLED);
if (SetMenuItemInfoW(menu, item, FALSE, &mii) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("SetMenuItemInfoW"));
return false;
}
return true;
};
const bool max = IsMaximized(hWnd);
if (!setState(SC_RESTORE, max)) {
return false;
}
if (!setState(SC_MOVE, !max)) {
return false;
}
if (!setState(SC_SIZE, !max)) {
return false;
}
if (!setState(SC_MINIMIZE, true)) {
return false;
}
if (!setState(SC_MAXIMIZE, !max)) {
return false;
}
if (!setState(SC_CLOSE, true)) {
return false;
}
if (SetMenuDefaultItem(menu, UINT_MAX, FALSE) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("SetMenuDefaultItem"));
return false;
}
const QPoint roundedPos = pos.toPoint();
const auto ret = TrackPopupMenu(menu, TPM_RETURNCMD, roundedPos.x(), roundedPos.y(), 0, hWnd, nullptr);
if (ret != 0) {
if (PostMessageW(hWnd, WM_SYSCOMMAND, ret, 0) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("PostMessageW"));
return false;
}
}
return true;
}
bool Utilities::isFullScreen(const WId winId)
{
Q_ASSERT(winId);
if (!winId) {
return false;
}
const auto hwnd = reinterpret_cast<HWND>(winId);
RECT wndRect = {};
if (GetWindowRect(hwnd, &wndRect) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("GetWindowRect"));
return false;
}
// According to Microsoft Docs, we should compare to primary
// screen's geometry.
const HMONITOR mon = MonitorFromWindow(hwnd, MONITOR_DEFAULTTOPRIMARY);
if (!mon) {
qWarning() << getSystemErrorMessage(QStringLiteral("MonitorFromWindow"));
return false;
}
MONITORINFO mi;
SecureZeroMemory(&mi, sizeof(mi));
mi.cbSize = sizeof(mi);
if (GetMonitorInfoW(mon, &mi) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("GetMonitorInfoW"));
return false;
}
// Compare to the full area of the screen, not the work area.
const RECT scrRect = mi.rcMonitor;
return ((wndRect.left == scrRect.left) && (wndRect.top == scrRect.top)
&& (wndRect.right == scrRect.right) && (wndRect.bottom == scrRect.bottom));
}
bool Utilities::isWindowNoState(const WId winId)
{
Q_ASSERT(winId);
if (!winId) {
return false;
}
const auto hwnd = reinterpret_cast<HWND>(winId);
WINDOWPLACEMENT wp;
SecureZeroMemory(&wp, sizeof(wp));
wp.length = sizeof(wp);
if (GetWindowPlacement(hwnd, &wp) == FALSE) {
qWarning() << getSystemErrorMessage(QStringLiteral("GetWindowPlacement"));
return false;
}
return ((wp.showCmd == SW_NORMAL) || (wp.showCmd == SW_RESTORE));
}
void Utilities::syncWmPaintWithDwm()
{
// No need to sync with DWM if DWM composition is disabled.
if (!isDwmCompositionAvailable()) {
return;
}
QSystemLibrary winmmLib(QStringLiteral("winmm"));
static const auto ptimeGetDevCaps =
reinterpret_cast</*MMRESULT*/UINT(WINAPI *)(flh_LPTIMECAPS, UINT)>(winmmLib.resolve("timeGetDevCaps"));
static const auto ptimeBeginPeriod =
reinterpret_cast</*MMRESULT*/UINT(WINAPI *)(UINT)>(winmmLib.resolve("timeBeginPeriod"));
static const auto ptimeEndPeriod =
reinterpret_cast</*MMRESULT*/UINT(WINAPI *)(UINT)>(winmmLib.resolve("timeEndPeriod"));
static const auto pDwmGetCompositionTimingInfo =
reinterpret_cast<HRESULT(WINAPI *)(HWND, DWM_TIMING_INFO *)>(QSystemLibrary::resolve(QStringLiteral("dwmapi"), "DwmGetCompositionTimingInfo"));
if (!ptimeGetDevCaps || !ptimeBeginPeriod || !ptimeEndPeriod || !pDwmGetCompositionTimingInfo) {
return;
}
// Dirty hack to workaround the resize flicker caused by DWM.
LARGE_INTEGER freq = {};
if (QueryPerformanceFrequency(&freq) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceFrequency"));
return;
}
flh_TIMECAPS tc = {};
if (ptimeGetDevCaps(&tc, sizeof(tc)) != /*MMSYSERR_NOERROR*/0) {
qWarning() << "timeGetDevCaps() failed.";
return;
}
const UINT ms_granularity = tc.wPeriodMin;
if (ptimeBeginPeriod(ms_granularity) != /*TIMERR_NOERROR*/0) {
qWarning() << "timeBeginPeriod() failed.";
return;
}
LARGE_INTEGER now0 = {};
if (QueryPerformanceCounter(&now0) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
return;
}
// ask DWM where the vertical blank falls
DWM_TIMING_INFO dti;
SecureZeroMemory(&dti, sizeof(dti));
dti.cbSize = sizeof(dti);
const HRESULT hr = pDwmGetCompositionTimingInfo(nullptr, &dti);
if (FAILED(hr)) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("DwmGetCompositionTimingInfo"));
return;
}
LARGE_INTEGER now1 = {};
if (QueryPerformanceCounter(&now1) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
return;
}
// - DWM told us about SOME vertical blank
// - past or future, possibly many frames away
// - convert that into the NEXT vertical blank
const LONGLONG period = dti.qpcRefreshPeriod;
const LONGLONG dt = dti.qpcVBlank - now1.QuadPart;
LONGLONG w = 0, m = 0;
if (dt >= 0) {
w = dt / period;
} else {
// reach back to previous period
// - so m represents consistent position within phase
w = -1 + dt / period;
}
m = dt - (period * w);
Q_ASSERT(m >= 0);
Q_ASSERT(m < period);
const qreal m_ms = 1000.0 * static_cast<qreal>(m) / static_cast<qreal>(freq.QuadPart);
Sleep(static_cast<DWORD>(qRound(m_ms)));
if (ptimeEndPeriod(ms_granularity) != /*TIMERR_NOERROR*/0) {
qWarning() << "timeEndPeriod() failed.";
}
}
FRAMELESSHELPER_END_NAMESPACE
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