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Backends: Win32: Rework to handle certains Windows 8.1/10 features without a manifest. (#4200, #4191)
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ocornut
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@ -22,7 +22,7 @@
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#include <dwmapi.h>
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// Configuration flags to add in your imconfig.h file:
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//#define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD // Disable gamepad support (this used to be meaningful before <1.81) but we know load XInput dynamically so the option is less relevant now.
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//#define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD // Disable gamepad support. This was meaningful before <1.81 but we now load XInput dynamically so the option is now less relevant.
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// Using XInput for gamepad (will load DLL dynamically)
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#ifndef IMGUI_IMPL_WIN32_DISABLE_GAMEPAD
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@ -33,6 +33,7 @@ typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-06-08: Fix ImGui_ImplWin32_EnableDpiAwareness() and ImGui_ImplWin32_GetDpiScaleForMonitor() to handle Windows 8.1/10 features without a manifest (per-monitor DPI, and properly calls SetProcessDpiAwareness() on 8.1).
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// 2021-03-23: Inputs: Clearing keyboard down array when losing focus (WM_KILLFOCUS).
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// 2021-02-18: Added ImGui_ImplWin32_EnableAlphaCompositing(). Non Visual Studio users will need to link with dwmapi.lib (MinGW/gcc: use -ldwmapi).
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// 2021-02-17: Fixed ImGui_ImplWin32_EnableDpiAwareness() attempting to get SetProcessDpiAwareness from shcore.dll on Windows 8 whereas it is only supported on Windows 8.1.
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@ -410,21 +411,30 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
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// If you are trying to implement your own backend for your own engine, you may ignore that noise.
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//---------------------------------------------------------------------------------------------------------
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// Implement some of the functions and types normally declared in recent Windows SDK.
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#if !defined(_versionhelpers_H_INCLUDED_) && !defined(_INC_VERSIONHELPERS)
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static BOOL IsWindowsVersionOrGreater(WORD major, WORD minor, WORD sp)
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// Perform our own check with RtlVerifyVersionInfo() instead of using functions from <VersionHelpers.h> as they
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// require a manifest to be functional for checks above 8.1. See https://github.com/ocornut/imgui/issues/4200
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static BOOL _IsWindowsVersionOrGreater(WORD major, WORD minor, WORD)
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{
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OSVERSIONINFOEXW osvi = { sizeof(osvi), major, minor, 0, 0, { 0 }, sp, 0, 0, 0, 0 };
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DWORD mask = VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR;
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ULONGLONG cond = ::VerSetConditionMask(0, VER_MAJORVERSION, VER_GREATER_EQUAL);
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cond = ::VerSetConditionMask(cond, VER_MINORVERSION, VER_GREATER_EQUAL);
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cond = ::VerSetConditionMask(cond, VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL);
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return ::VerifyVersionInfoW(&osvi, mask, cond);
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typedef LONG(WINAPI* PFN_RtlVerifyVersionInfo)(OSVERSIONINFOEXW*, ULONG, ULONGLONG);
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static PFN_RtlVerifyVersionInfo RtlVerifyVersionInfoFn = NULL;
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if (RtlVerifyVersionInfoFn == NULL)
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if (HMODULE ntdllModule = ::GetModuleHandleA("ntdll.dll"))
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RtlVerifyVersionInfoFn = (PFN_RtlVerifyVersionInfo)GetProcAddress(ntdllModule, "RtlVerifyVersionInfo");
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RTL_OSVERSIONINFOEXW versionInfo = { };
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ULONGLONG conditionMask = 0;
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versionInfo.dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
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versionInfo.dwMajorVersion = major;
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versionInfo.dwMinorVersion = minor;
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VER_SET_CONDITION(conditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL);
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VER_SET_CONDITION(conditionMask, VER_MINORVERSION, VER_GREATER_EQUAL);
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return (RtlVerifyVersionInfoFn(&versionInfo, VER_MAJORVERSION | VER_MINORVERSION, conditionMask) == 0) ? TRUE : FALSE;
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}
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#define IsWindowsVistaOrGreater() IsWindowsVersionOrGreater(HIBYTE(0x0600), LOBYTE(0x0600), 0) // _WIN32_WINNT_VISTA
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#define IsWindows8OrGreater() IsWindowsVersionOrGreater(HIBYTE(0x0602), LOBYTE(0x0602), 0) // _WIN32_WINNT_WIN8
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#define IsWindows8Point1OrGreater() IsWindowsVersionOrGreater(HIBYTE(0x0603), LOBYTE(0x0603), 0) // _WIN32_WINNT_WINBLUE
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#endif
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#define _IsWindowsVistaOrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0600), LOBYTE(0x0600), 0) // _WIN32_WINNT_VISTA
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#define _IsWindows8OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0602), LOBYTE(0x0602), 0) // _WIN32_WINNT_WIN8
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#define _IsWindows8Point1OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0603), LOBYTE(0x0603), 0) // _WIN32_WINNT_WINBLUE
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#define _IsWindows10OrGreater() _IsWindowsVersionOrGreater(HIBYTE(0x0A00), LOBYTE(0x0A00), 0) // _WIN32_WINNT_WINTHRESHOLD / _WIN32_WINNT_WIN10
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#ifndef DPI_ENUMS_DECLARED
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typedef enum { PROCESS_DPI_UNAWARE = 0, PROCESS_SYSTEM_DPI_AWARE = 1, PROCESS_PER_MONITOR_DPI_AWARE = 2 } PROCESS_DPI_AWARENESS;
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@ -444,7 +454,7 @@ typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWAR
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// Helper function to enable DPI awareness without setting up a manifest
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void ImGui_ImplWin32_EnableDpiAwareness()
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{
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// if (IsWindows10OrGreater()) // This needs a manifest to succeed. Instead we try to grab the function pointer!
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if (_IsWindows10OrGreater())
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{
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static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
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if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext"))
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@ -453,7 +463,7 @@ void ImGui_ImplWin32_EnableDpiAwareness()
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return;
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}
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}
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if (IsWindows8Point1OrGreater())
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if (_IsWindows8Point1OrGreater())
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{
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static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
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if (PFN_SetProcessDpiAwareness SetProcessDpiAwarenessFn = (PFN_SetProcessDpiAwareness)::GetProcAddress(shcore_dll, "SetProcessDpiAwareness"))
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@ -474,23 +484,26 @@ void ImGui_ImplWin32_EnableDpiAwareness()
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float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
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{
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UINT xdpi = 96, ydpi = 96;
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static BOOL bIsWindows8Point1OrGreater = IsWindows8Point1OrGreater();
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if (bIsWindows8Point1OrGreater)
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if (_IsWindows8Point1OrGreater())
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{
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static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
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if (PFN_GetDpiForMonitor GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor"))
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GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
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static HINSTANCE shcore_dll = ::LoadLibraryA("shcore.dll"); // Reference counted per-process
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static PFN_GetDpiForMonitor GetDpiForMonitorFn = NULL;
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if (GetDpiForMonitorFn == NULL && shcore_dll != NULL)
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GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor");
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if (GetDpiForMonitorFn != NULL)
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{
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GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
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IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
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return xdpi / 96.0f;
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}
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}
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#ifndef NOGDI
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else
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{
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const HDC dc = ::GetDC(NULL);
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xdpi = ::GetDeviceCaps(dc, LOGPIXELSX);
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ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
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::ReleaseDC(NULL, dc);
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}
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#endif
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const HDC dc = ::GetDC(NULL);
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xdpi = ::GetDeviceCaps(dc, LOGPIXELSX);
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ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
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IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
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::ReleaseDC(NULL, dc);
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#endif
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return xdpi / 96.0f;
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}
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@ -513,7 +526,7 @@ float ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd)
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// (the Dwm* functions are Vista era functions but we are borrowing logic from GLFW)
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void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
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{
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if (!IsWindowsVistaOrGreater())
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if (!_IsWindowsVistaOrGreater())
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return;
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BOOL composition;
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@ -522,7 +535,7 @@ void ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd)
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BOOL opaque;
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DWORD color;
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if (IsWindows8OrGreater() || (SUCCEEDED(::DwmGetColorizationColor(&color, &opaque)) && !opaque))
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if (_IsWindows8OrGreater() || (SUCCEEDED(::DwmGetColorizationColor(&color, &opaque)) && !opaque))
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{
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HRGN region = ::CreateRectRgn(0, 0, -1, -1);
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DWM_BLURBEHIND bb = {};
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@ -47,6 +47,9 @@ Other Changes:
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- Demo: Fixed requirement in 1.83 to link with imgui_demo.cpp if IMGUI_DISABLE_METRICS_WINDOW is not set. (#4171)
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Normally the right way to disable compiling the demo is to set IMGUI_DISABLE_DEMO_WINDOWS, but we want to avoid
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implying that the file is required.
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- Backends: Win32: Rework to handle certains Windows 8.1/10 features without a manifest. (#4200, #4191)
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- ImGui_ImplWin32_GetDpiScaleForMonitor() will handle per-monitor DPI on Windows 10 without a manifest.
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- ImGui_ImplWin32_EnableDpiAwareness() will call SetProcessDpiAwareness() fallback on Windows 8.1 without a manifest.
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- Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)
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- Examples: Updated all .vcxproj to VS2015 (toolset v140) to facilitate usage with vcpkg.
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- Examples: SDL2: Accomodate for vcpkg install having headers in SDL2/SDL.h vs SDL.h.
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