[USER32] Introduce user32_vista and stubplement GetDpiForWindow() (#6208)

Add user32_vista.dll to introduce new NT6+ User32 features without changing the existing User32.dll when compiled as NT5.x. Also implements a stub for GetDpiForWindow(). The GetDpiForWindow() function will be required to Wine-sync common controls to modern Wine versions.

Changes:
Expose GetDpiForWindow() function and USER_DEFAULT_SCREEN_DPI to appropriate versions in winuser.h
Introduce a basic user32_vista library that can be expanded as needed.

sdk/include/psdk/winuser.h

@@ -4924,6 +4924,15 @@ BOOL WINAPI GetWindowInfo(_In_ HWND, _Inout_ PWINDOWINFO);
 BOOL WINAPI GetMonitorInfoA(_In_ HMONITOR, _Inout_ LPMONITORINFO);
 BOOL WINAPI GetMonitorInfoW(_In_ HMONITOR, _Inout_ LPMONITORINFO);
 
+#if (_WIN32_WINNT >= _WIN32_WINNT_VISTA)
+#define USER_DEFAULT_SCREEN_DPI 96
+#endif /* _WIN32_WINNT >= _WIN32_WINNT_VISTA */
+
+#if (_WIN32_WINNT >= 0x0605) /* Windows 10 pre-Threshold */
+UINT WINAPI GetDpiForSystem(VOID);
+UINT WINAPI GetDpiForWindow(_In_ HWND hwnd);
+#endif /* _WIN32_WINNT >= 0x0605 */
+
 UINT
 WINAPI
 GetWindowModuleFileNameA(

win32ss/CMakeLists.txt

@@ -19,6 +19,7 @@ add_subdirectory(gdi/gdi32_vista)
 add_subdirectory(printing)
 add_subdirectory(reactx)
 add_subdirectory(user/user32)
+add_subdirectory(user/user32_vista)
 add_subdirectory(user/winsrv)
 
 spec2def(win32k.sys win32k.spec ADD_IMPORTLIB)

win32ss/user/user32/CMakeLists.txt

@@ -80,7 +80,7 @@ add_library(user32 MODULE
     ${CMAKE_CURRENT_BINARY_DIR}/user32.def)
 
 set_module_type(user32 win32dll UNICODE ENTRYPOINT DllMain 12)
-target_link_libraries(user32 user32_wsprintf wine win32ksys ${PSEH_LIB})
+target_link_libraries(user32 user32_vista_static user32_wsprintf wine win32ksys ${PSEH_LIB})
 add_dependencies(user32 asm)
 
 if(MSVC AND (ARCH STREQUAL "i386"))

win32ss/user/user32/user32.spec

@@ -282,6 +282,8 @@
 279 stdcall GetDlgItemTextA(long long ptr long)
 280 stdcall GetDlgItemTextW(long long ptr long)
 281 stdcall GetDoubleClickTime() NtUserGetDoubleClickTime
+@ stdcall -version=0xA00+ GetDpiForSystem()
+@ stdcall -version=0xA00+ GetDpiForWindow(ptr)
 282 stdcall GetFocus()
 283 stdcall GetForegroundWindow() NtUserGetForegroundWindow
 284 stdcall GetGUIThreadInfo(long ptr) NtUserGetGUIThreadInfo

win32ss/user/user32_vista/CMakeLists.txt

@@ -0,0 +1,25 @@
+
+spec2def(user32_vista.dll user32_vista.spec ADD_IMPORTLIB)
+
+include_directories(
+    include
+    ${REACTOS_SOURCE_DIR}/win32ss/include)
+
+list(APPEND SOURCE
+    dpi.c)
+
+add_library(user32_vista_static
+    ${SOURCE})
+target_link_libraries(user32_vista_static win32ksys)
+add_dependencies(user32_vista_static psdk)
+
+add_library(user32_vista MODULE
+    ${SOURCE}
+    user32_vista.rc
+    ${CMAKE_CURRENT_BINARY_DIR}/user32_vista.def)
+
+set_module_type(user32_vista win32dll UNICODE ENTRYPOINT 0)
+add_importlibs(user32_vista user32 gdi32 ntdll)
+target_link_libraries(user32_vista user32_vista_static win32ksys)
+add_dependencies(user32_vista psdk)
+add_cd_file(TARGET user32_vista DESTINATION reactos/system32 FOR all)

win32ss/user/user32_vista/dpi.c

@@ -0,0 +1,44 @@
+/*
+ * PROJECT:     ReactOS Kernel - Vista+ APIs
+ * LICENSE:     LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:     DPI functions for user32 and user32_vista.
+ * COPYRIGHT:   Copyright 2024 Carl Bialorucki <cbialo2@outlook.com>
+ */
+
+#define WIN32_NO_STATUS
+#define _INC_WINDOWS
+#define COM_NO_WINDOWS_H
+#include <windef.h>
+#include <wingdi.h>
+#include <winuser.h>
+
+#define NDEBUG
+#include <debug.h>
+
+/*
+ * @stub
+ */
+UINT
+WINAPI
+GetDpiForSystem(VOID)
+{
+    HDC hDC;
+    UINT Dpi;
+    hDC = GetDC(NULL);
+    Dpi = GetDeviceCaps(hDC, LOGPIXELSY);
+    ReleaseDC(NULL, hDC);
+    return Dpi;
+}
+
+/*
+ * @stub
+ */
+UINT
+WINAPI
+GetDpiForWindow(
+    _In_ HWND hWnd)
+{
+    UNIMPLEMENTED_ONCE;
+    UNREFERENCED_PARAMETER(hWnd);
+    return GetDpiForSystem();
+}

win32ss/user/user32_vista/user32_vista.rc

@@ -0,0 +1,5 @@
+#define REACTOS_VERSION_DLL
+#define REACTOS_STR_FILE_DESCRIPTION  "User32 Extensions DLL"
+#define REACTOS_STR_INTERNAL_NAME     "user32_vista"
+#define REACTOS_STR_ORIGINAL_FILENAME "user32_vista.dll"
+#include <reactos/version.rc>

win32ss/user/user32_vista/user32_vista.spec

@@ -0,0 +1,2 @@
+@ stdcall GetDpiForSystem()
+@ stdcall GetDpiForWindow(ptr)