From 0ce906306b955cab497b67e8cee545d89359b432 Mon Sep 17 00:00:00 2001
From: Andreas Koch <andreas.koch@yatta.de>
Date: Thu, 20 Feb 2025 12:50:27 +0100
Subject: [PATCH] [win32] add GetDpiForWindow OS call

This commit adds the OS call for GetDpiForWindow.
---
 .../Eclipse SWT PI/win32/library/os.c         | 20 +++++++++++++++++++
 .../Eclipse SWT PI/win32/library/os_custom.h  |  1 +
 .../Eclipse SWT PI/win32/library/os_stats.h   |  1 +
 .../org/eclipse/swt/internal/win32/OS.java    |  2 ++
 4 files changed, 24 insertions(+)

diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os.c b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os.c
index 5777dd413e3..9b5a61b908c 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os.c	
+++ b/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)
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.h b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.h
index 5230ab388da..f26e394844f 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_custom.h	
+++ b/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"
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_stats.h b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_stats.h
index ddc3afef2ef..b828c865599 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/library/os_stats.h	
+++ b/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,
diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/win32/OS.java b/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/win32/OS.java
index 9e3d32df788..c41bbfad527 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/win32/org/eclipse/swt/internal/win32/OS.java	
+++ b/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);