Conform Per-Monitor DPI v2 protocol in Windows

[yukawa]

Description

Currently Mozc binaries fall into System DPI Awareness category in Windows.

We'd like to make them run under Per-Monitor v2 Awareness mode.

Version or commit-id

af20906

Environment

• OS: Windows 11 22H2

Additional Context

src/gui/tool/mozc_tool.exe.manifest

mozc/src/gui/tool/mozc_tool.exe.manifest

Lines 25 to 27 in af20906

	<asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
	<dpiAware>true</dpiAware>
	</asmv3:windowsSettings>

Needs PerMonitorV2 declaration.

      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>

Also, it'd be safer to switch to Qt 6.6 or later version, which contains qt/qtbase@5e0d9a0.

---

src/renderer/win32/mozc_renderer.exe.manifest

mozc/src/renderer/win32/mozc_renderer.exe.manifest

Lines 25 to 27 in af20906

	<asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
	<dpiAware>true</dpiAware>
	</asmv3:windowsSettings>

Needs PerMonitorV2 declaration.

      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>

---

src/renderer/win32/indicator_window.cc

mozc/src/renderer/win32/indicator_window.cc

Lines 96 to 100 in af20906

	double GetDPIScaling() {
	CDC desktop_dc(::GetDC(nullptr));
	const int dpi_x = desktop_dc.GetDeviceCaps(LOGPIXELSX);
	return static_cast<double>(dpi_x) / kDefaultDPI;
	}

We can no longer assume this is a runtime constant.

mozc/src/renderer/win32/indicator_window.cc

Lines 115 to 119 in af20906

	BEGIN_MSG_MAP_EX(WindowImpl)
	MSG_WM_CREATE(OnCreate)
	MSG_WM_TIMER(OnTimer)
	MSG_WM_SETTINGCHANGE(OnSettingChange)
	END_MSG_MAP()

We also need to handle WM_DPICHANGED.

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src/renderer/win32/candidate_window.h

mozc/src/renderer/win32/candidate_window.h

Lines 77 to 88 in af20906

	BEGIN_MSG_MAP_EX(CandidateWindow)
	MSG_WM_CREATE(OnCreate)
	MSG_WM_DESTROY(OnDestroy)
	MSG_WM_ERASEBKGND(OnEraseBkgnd)
	MSG_WM_GETMINMAXINFO(OnGetMinMaxInfo)
	MSG_WM_LBUTTONDOWN(OnLButtonDown)
	MSG_WM_LBUTTONUP(OnLButtonUp)
	MSG_WM_MOUSEMOVE(OnMouseMove)
	MSG_WM_SETTINGCHANGE(OnSettingChange)
	MSG_WM_PAINT(OnPaint)
	MSG_WM_PRINTCLIENT(OnPrintClient)
	END_MSG_MAP()

We also need to handle WM_DPICHANGED.

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src/renderer/win32/candidate_window.cc

mozc/src/renderer/win32/candidate_window.cc

Lines 234 to 265 in af20906

	double scale_factor_x = 1.0;
	double scale_factor_y = 1.0;
	RendererStyleHandler::GetDPIScalingFactor(&scale_factor_x, &scale_factor_y);
	double image_scale_factor = 1.0;
	if (scale_factor_x < 1.125 || scale_factor_y < 1.125) {
	footer_logo_.Attach(LoadBitmapFromResource(::GetModuleHandle(nullptr),
	IDB_FOOTER_LOGO_COLOR_100));
	image_scale_factor = 1.0;
	} else if (scale_factor_x < 1.375 || scale_factor_y < 1.375) {
	footer_logo_.Attach(LoadBitmapFromResource(::GetModuleHandle(nullptr),
	IDB_FOOTER_LOGO_COLOR_125));
	image_scale_factor = 1.25;
	} else if (scale_factor_x < 1.75 || scale_factor_y < 1.75) {
	footer_logo_.Attach(LoadBitmapFromResource(::GetModuleHandle(nullptr),
	IDB_FOOTER_LOGO_COLOR_150));
	image_scale_factor = 1.5;
	} else {
	footer_logo_.Attach(LoadBitmapFromResource(::GetModuleHandle(nullptr),
	IDB_FOOTER_LOGO_COLOR_200));
	image_scale_factor = 2.0;
	}
	// If DPI is not default value, re-calculate the size based on the DPI.
	if (!footer_logo_.IsNull()) {
	CSize size;
	footer_logo_.GetSize(size);
	size.cx *= (scale_factor_x / image_scale_factor);
	size.cy *= (scale_factor_y / image_scale_factor);
	footer_logo_display_size_ = Size(size.cx, size.cy);
	}
	indicator_width_ = kIndicatorWidthInDefaultDPI * scale_factor_x;

scale_factor_x and scale_factor_y are no longer the runtime constants. We need to re-calculate these values every time WM_DPICHANGED is received.

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src/win32/tip/tip_lang_bar_menu.cc

LoadIconFromResource should use GetSystemMetricsForDpi with primary display's DPI no matter which display is used to show the application, because the IME mode icon is shown only on the primary display.

mozc/src/win32/tip/tip_lang_bar_menu.cc

Lines 105 to 119 in af20906

	HICON LoadIconFromResource(HINSTANCE instance, UINT icon_id) {
	const auto icon_size = ::GetSystemMetrics(SM_CYSMICON);
	// Replace some text icons with on-the-fly image drawn with MS-Gothic.
	const auto &icon_text = GetIconStringIfNecessary(icon_id);
	if (!icon_text.empty()) {
	const COLORREF text_color = ::GetSysColor(COLOR_WINDOWTEXT);
	return TextIcon::CreateMonochromeIcon(icon_size, icon_size, icon_text,
	kTextIconFont, text_color);
	}
	return static_cast<HICON>(::LoadImage(instance, MAKEINTRESOURCE(icon_id),
	IMAGE_ICON, icon_size, icon_size,
	LR_CREATEDIBSECTION));
	}