Register/De-registering resources with zoom support

Author: ShahzaibIbrahim

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Cursor.java

@@ -82,6 +82,7 @@ public final class Cursor extends Resource {
 	this.mask = null;
 	this.hotspotX = -1;
 	this.hotspotY = -1;
+	this.device.registerResourceWithZoomSupport(this);
 }
 
 /**
@@ -162,6 +163,7 @@ public Cursor(Device device, int style) {
 	handle = OS.LoadCursor(0, lpCursorName);
 	if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
 	init();
+	this.device.registerResourceWithZoomSupport(this);
 }
 
 /**
@@ -232,6 +234,7 @@ public Cursor(Device device, ImageData source, ImageData mask, int hotspotX, int
 	handle = OS.CreateCursor(hInst, hotspotX, hotspotY, source.width, source.height, sourceData, maskData);
 	if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
 	init();
+	this.device.registerResourceWithZoomSupport(this);
 }
 
 /**
@@ -340,6 +343,7 @@ public Cursor(Device device, ImageData source, int hotspotX, int hotspotY) {
 	if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
 	isIcon = true;
 	init();
+	this.device.registerResourceWithZoomSupport(this);
 }
 
 /**
@@ -405,6 +409,7 @@ void destroy () {
 //	if (OS.GetCursor() == handle) {
 //		OS.SetCursor(OS.LoadCursor(0, OS.IDC_ARROW));
 //	}
+	device.deregisterResourceWithZoomSupport(this);
 	destroyHandle();
 }
 
@@ -492,6 +497,18 @@ public String toString () {
 	return "Cursor {" + handle + "}";
 }
 
+@Override
+void destroyHandlesExcept(Set<Integer> zoomLevels) {
+	zoomLevelToHandle.entrySet().removeIf(entry -> {
+		final Integer zoom = entry.getKey();
+		if (!zoomLevels.contains(zoom) && zoom != DPIUtil.getZoomForAutoscaleProperty(DEFAULT_ZOOM)) {
+			destroyHandle(entry.getValue());
+			return true;
+		}
+		return false;
+	});
+}
+
 /**
  * Invokes platform specific functionality to allocate a new cursor.
  * <p>