[win32] add GetDpiForWindow OS call

This commit adds the OS call for GetDpiForWindow.

Author: akoch-yatta

bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os.c

@@ -2510,6 +2510,26 @@ JNIEXPORT jint JNICALL OS_NATIVE(GetDpiForMonitor)
 }
 #endif
 
+#ifndef NO_GetDpiForWindow
+JNIEXPORT jint JNICALL OS_NATIVE(GetDpiForWindow)
+	(JNIEnv *env, jclass that, jlong arg0)
+{
+	jint rc = 0;
+	OS_NATIVE_ENTER(env, that, GetDpiForWindow_FUNC);
+/*
+	rc = (jint)GetDpiForWindow(arg0);
+*/
+	{
+		OS_LOAD_FUNCTION(fp, GetDpiForWindow)
+		if (fp) {
+			rc = (jint)((jint (CALLING_CONVENTION*)(jlong))fp)(arg0);
+		}
+	}
+	OS_NATIVE_EXIT(env, that, GetDpiForWindow_FUNC);
+	return rc;
+}
+#endif
+
 #ifndef NO_GetFocus
 JNIEXPORT jlong JNICALL OS_NATIVE(GetFocus)
 	(JNIEnv *env, jclass that)

bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.h

@@ -19,6 +19,7 @@
 
 /* Libraries for dynamic loaded functions */
 #define GetDpiForMonitor_LIB "shcore.dll"
+#define GetDpiForWindow_LIB "user32.dll"
 #define RtlGetVersion_LIB "ntdll.dll"
 #define OpenThemeDataForDpi_LIB "uxtheme.dll"
 #define GetSystemMetricsForDpi_LIB "user32.dll"

bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_stats.h

@@ -203,6 +203,7 @@ typedef enum {
 	GetDlgItem_FUNC,
 	GetDoubleClickTime_FUNC,
 	GetDpiForMonitor_FUNC,
+	GetDpiForWindow_FUNC,
 	GetFocus_FUNC,
 	GetFontLanguageInfo_FUNC,
 	GetForegroundWindow_FUNC,

bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/win32/OS.java

@@ -2814,6 +2814,8 @@ public static int HRESULT_FROM_WIN32(int x) {
 public static final native int GetDoubleClickTime ();
 /** @method flags=dynamic */
 public static final native int GetDpiForMonitor (long hmonitor, int dpiType, int [] dpiX, int [] dpiY);
+/** @method flags=dynamic */
+public static final native int GetDpiForWindow (long hWnd);
 public static final native long GetFocus ();
 /** @param hdc cast=(HDC) */
 public static final native int GetFontLanguageInfo (long hdc);