Consider that program icons have scaling of primary monitor

When loading icons for programs, their image data will be scaled
according to the primary monitor scaling. This is different from other
images, which when loaded have their original size. This change reflects
that behavior when creating the image data for a target zoom factor by
considering the icon's pre-scaling. It also add a @SInCE tag for the
previously introduced zoom-aware getImageData() method for the Program
class.

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT Program/cocoa/org/eclipse/swt/program/Program.java

@@ -354,6 +354,7 @@ public ImageData getImageData () {
  *            The zoom level in % of the standard resolution
  * 
  * @return the image data for the program, may be null
+ * @since 3.125
  */
 public ImageData getImageData (int zoom) {
 	NSAutoreleasePool pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();

bundles/org.eclipse.swt/Eclipse SWT Program/gtk/org/eclipse/swt/program/Program.java

@@ -141,6 +141,7 @@ public ImageData getImageData() {
  *            The zoom level in % of the standard resolution
  *
  * @return the image data for the program, may be null
+ * @since 3.125
  */
 public ImageData getImageData(int zoom) {
 	if (iconPath == null) return null;

bundles/org.eclipse.swt/Eclipse SWT Program/win32/org/eclipse/swt/program/Program.java

@@ -19,7 +19,9 @@
 
 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.internal.*;
 import org.eclipse.swt.internal.win32.*;
+import org.eclipse.swt.widgets.*;
 
 /**
  * Instances of this class represent programs and
@@ -372,6 +374,7 @@ public ImageData getImageData () {
  *            The zoom level in % of the standard resolution
  *
  * @return the image data for the program, may be null
+ * @since 3.125
  */
 public ImageData getImageData (int zoom) {
 	int nIconIndex = 0;
@@ -395,7 +398,10 @@ public ImageData getImageData (int zoom) {
 	OS.ExtractIconEx (lpszFile, nIconIndex, phiconLarge, phiconSmall, 1);
 	if (phiconSmall [0] == 0) return null;
 	Image image = Image.win32_new (null, SWT.ICON, phiconSmall [0]);
-  ImageData imageData = image.getImageData (zoom);
+	// Windows API returns image data according to primary monitor zoom factor
+	// rather than at original scaling
+	int nativeZoomFactor = 100 * Display.getCurrent().getPrimaryMonitor().getZoom() / DPIUtil.getDeviceZoom();
+	ImageData imageData = image.getImageData (100 * zoom / nativeZoomFactor);
 	image.dispose ();
 	return imageData;
 }