Use DPI-aware AdjustWindowRectExForDpi when available

AdjustWindowRectEx does not take DPI into account, leading to dialog
windows being cut off. This change adjusts usages of that method to
AdjustWindowRectExForDpi, passing the zoom level to retrieve correct
coordinates and scaling accordingly.

Author: ShahzaibIbrahim

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

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2024 IBM Corporation and others.
+ * Copyright (c) 2000, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -124,6 +124,31 @@ JNIEXPORT jboolean JNICALL OS_NATIVE(AdjustWindowRectEx)
 }
 #endif
 
+#ifndef NO_AdjustWindowRectExForDpi
+JNIEXPORT jboolean JNICALL OS_NATIVE(AdjustWindowRectExForDpi)
+	(JNIEnv *env, jclass that, jobject arg0, jint arg1, jboolean arg2, jint arg3, jint arg4)
+{
+	RECT _arg0, *lparg0=NULL;
+	jboolean rc = 0;
+	
+	OS_NATIVE_ENTER(env, that, AdjustWindowRectExForDpi_FUNC);
+	if (arg0) if ((lparg0 = getRECTFields(env, arg0, &_arg0)) == NULL) goto fail;
+/*
+	rc = (jboolean)AdjustWindowRectExForDpi(lparg0, arg1, arg2, arg3, arg4);
+*/
+	{
+		OS_LOAD_FUNCTION(fp, AdjustWindowRectExForDpi)
+		if (fp) {
+			rc = (jboolean)((jboolean (CALLING_CONVENTION*)(RECT *, jint, jboolean, jint, jint))fp)(lparg0, arg1, arg2, arg3, arg4);
+		}
+	}
+fail:
+	if (arg0 && lparg0) setRECTFields(env, arg0, lparg0);
+	OS_NATIVE_EXIT(env, that, AdjustWindowRectExForDpi_FUNC);
+	return rc;
+}
+#endif
+
 #ifndef NO_AllowSetForegroundWindow
 JNIEXPORT jboolean JNICALL OS_NATIVE(AllowSetForegroundWindow)
 	(JNIEnv *env, jclass that, jint arg0)

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

@@ -25,3 +25,4 @@
 #define GetThreadDpiAwarenessContext_LIB "user32.dll"
 #define SetThreadDpiAwarenessContext_LIB "user32.dll"
 #define SystemParametersInfoForDpi_LIB "user32.dll"
+#define AdjustWindowRectExForDpi_LIB "user32.dll"

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

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2024 IBM Corporation and others.
+ * Copyright (c) 2000, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -30,6 +30,7 @@ typedef enum {
 	ActivateKeyboardLayout_FUNC,
 	AddFontResourceEx_FUNC,
 	AdjustWindowRectEx_FUNC,
+	AdjustWindowRectExForDpi_FUNC,
 	AllowDarkModeForWindow_FUNC,
 	AllowSetForegroundWindow_FUNC,
 	AlphaBlend_FUNC,

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

@@ -2346,6 +2346,8 @@ public static int HRESULT_FROM_WIN32(int x) {
  */
 public static final native int AddFontResourceEx(char[] lpszFilename, int fl, long pdv);
 public static final native boolean AdjustWindowRectEx (RECT lpRect, int dwStyle, boolean bMenu, int dwExStyle);
+/** @method flags=dynamic */
+public static final native boolean AdjustWindowRectExForDpi (RECT lpRect, int dwStyle, boolean bMenu, int dwExStyle, int dpi);
 /** @method flags=no_gen */
 public static final native boolean AllowDarkModeForWindow(long hWnd, boolean allow);
 public static final native boolean AllowSetForegroundWindow (int dwProcessId);

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Decorations.java

@@ -313,7 +313,7 @@ Control computeTabRoot () {
 	int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
 	boolean hasMenu = OS.GetMenu (handle) != 0;
-	OS.AdjustWindowRectEx (rect, bits1, hasMenu, bits2);
+	adjustWindowRectEx(rect, bits1, hasMenu, bits2);
 
 	/* Get the size of the scroll bars */
 	if (horizontalBar != null) rect.bottom += getSystemMetrics (OS.SM_CYHSCROLL);
@@ -472,7 +472,7 @@ void fixDecorations (Decorations newDecorations, Control control, Menu [] menus)
 		int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 		int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
 		boolean hasMenu = OS.GetMenu (handle) != 0;
-		OS.AdjustWindowRectEx (rect, bits1, hasMenu, bits2);
+		adjustWindowRectEx(rect, bits1, hasMenu, bits2);
 		width = Math.max (0, width - (rect.right - rect.left));
 		height = Math.max (0, height - (rect.bottom - rect.top));
 		return new Rectangle (0, 0, width, height);

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Scrollable.java

@@ -134,7 +134,7 @@ Rectangle computeTrimInPixels (int x, int y, int width, int height) {
 	OS.SetRect (rect, x, y, x + width, y + height);
 	int bits1 = OS.GetWindowLong (scrolledHandle, OS.GWL_STYLE);
 	int bits2 = OS.GetWindowLong (scrolledHandle, OS.GWL_EXSTYLE);
-	OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+	adjustWindowRectEx(rect, bits1, false, bits2);
 	if (horizontalBar != null) rect.bottom += getSystemMetrics (OS.SM_CYHSCROLL);
 	if (verticalBar != null) rect.right += getSystemMetrics (OS.SM_CXVSCROLL);
 	int nWidth = rect.right - rect.left, nHeight = rect.bottom - rect.top;

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Shell.java

@@ -1068,7 +1068,7 @@ Point getMaximumSizeInPixels () {
 			RECT rect = new RECT ();
 			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
-			OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+			adjustWindowRectEx(rect, bits1, false, bits2);
 			height = Math.min (height, rect.bottom - rect.top);
 		}
 	}
@@ -1109,7 +1109,7 @@ Point getMinimumSizeInPixels () {
 			RECT rect = new RECT ();
 			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
-			OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+			adjustWindowRectEx(rect, bits1, false, bits2);
 			height = Math.max (height, rect.bottom - rect.top);
 		}
 	}
@@ -1815,7 +1815,7 @@ void setMaximumSizeInPixels (int width, int height) {
 			RECT rect = new RECT ();
 			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
-			OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+			adjustWindowRectEx(rect, bits1, false, bits2);
 			heightLimit = rect.bottom - rect.top;
 		}
 	}
@@ -1861,7 +1861,7 @@ void setMinimumSizeInPixels (int width, int height) {
 			RECT rect = new RECT ();
 			int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 			int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
-			OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+			adjustWindowRectEx(rect, bits1, false, bits2);
 			heightLimit = rect.bottom - rect.top;
 		}
 	}
@@ -2671,7 +2671,7 @@ LRESULT WM_WINDOWPOSCHANGING (long wParam, long lParam) {
 				RECT rect = new RECT ();
 				int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
 				int bits2 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
-				OS.AdjustWindowRectEx (rect, bits1, false, bits2);
+				adjustWindowRectEx(rect, bits1, false, bits2);
 				lpwp.cy = Math.max (lpwp.cy, rect.bottom - rect.top);
 			}
 		}

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Spinner.java

@@ -320,7 +320,7 @@ void addVerifyListener (VerifyListener listener) {
 		bits0 &= ~OS.WS_BORDER;
 		bits1 |= OS.WS_EX_CLIENTEDGE;
 	}
-	OS.AdjustWindowRectEx (rect, bits0, false, bits1);
+	adjustWindowRectEx(rect, bits0, false, bits1);
 	width = rect.right - rect.left;
 	height = rect.bottom - rect.top;
 

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Widget.java

@@ -2708,5 +2708,15 @@ int getSystemMetrics(int nIndex) {
 	return OS.GetSystemMetrics(nIndex);
 }
 
+boolean adjustWindowRectEx(RECT lpRect, int dwStyle, boolean bMenu, int dwExStyle) {
+	/*
+	 * DPI-dependent version of the method was introduced with Windows 10 Version 1607
+	 */
+	if (OS.WIN32_BUILD >= OS.WIN32_BUILD_WIN10_1607) {
+		return OS.AdjustWindowRectExForDpi (lpRect, dwStyle, bMenu, dwExStyle, DPIUtil.mapZoomToDPI(nativeZoom));
+	}
+	return OS.AdjustWindowRectEx(lpRect, dwStyle, bMenu, dwExStyle);
+}
+
 
 }