8211999: Window positioning bugs due to overlapping GraphicsDevice bounds (Windows/HiDPI)

src/java.desktop/share/classes/java/awt/Robot.java

@@ -43,6 +43,9 @@
 import sun.awt.image.SunWritableRaster;
 import sun.java2d.SunGraphicsEnvironment;
 
+import static sun.java2d.SunGraphicsEnvironment.toDeviceSpace;
+import static sun.java2d.SunGraphicsEnvironment.toDeviceSpaceAbs;
+
 /**
  * This class is used to generate native system input events
  * for the purposes of test automation, self-running demos, and
@@ -385,13 +388,9 @@ private static void checkKeycodeArgument(int keycode) {
      */
     public synchronized Color getPixelColor(int x, int y) {
         checkScreenCaptureAllowed();
-        AffineTransform tx = GraphicsEnvironment.
-                getLocalGraphicsEnvironment().getDefaultScreenDevice().
-                getDefaultConfiguration().getDefaultTransform();
-        x = (int) (x * tx.getScaleX());
-        y = (int) (y * tx.getScaleY());
-        Color color = new Color(peer.getRGBPixel(x, y));
-        return color;
+        Point point = peer.useAbsoluteCoordinates() ? toDeviceSpaceAbs(x, y)
+                                                    : toDeviceSpace(x, y);
+        return new Color(peer.getRGBPixel(point.x, point.y));
     }
 
     /**
@@ -523,17 +522,16 @@ public synchronized BufferedImage createScreenCapture(Rectangle screenRect) {
             imageArray[0] = highResolutionImage;
 
         } else {
-
-            int sX = (int) Math.floor(screenRect.x * uiScaleX);
-            int sY = (int) Math.floor(screenRect.y * uiScaleY);
-            int sWidth = (int) Math.ceil(screenRect.width * uiScaleX);
-            int sHeight = (int) Math.ceil(screenRect.height * uiScaleY);
-            int[] temppixels;
-            Rectangle scaledRect = new Rectangle(sX, sY, sWidth, sHeight);
-            temppixels = peer.getRGBPixels(scaledRect);
-
+            Rectangle scaledRect;
+            if (peer.useAbsoluteCoordinates()) {
+                scaledRect = toDeviceSpaceAbs(gc, screenRect.x,
+                        screenRect.y, screenRect.width, screenRect.height);
+            } else {
+                scaledRect = toDeviceSpace(gc, screenRect.x,
+                        screenRect.y, screenRect.width, screenRect.height);
+            }
             // HighResolutionImage
-            pixels = temppixels;
+            pixels = peer.getRGBPixels(scaledRect);
             buffer = new DataBufferInt(pixels, pixels.length);
             raster = Raster.createPackedRaster(buffer, scaledRect.width,
                     scaledRect.height, scaledRect.width, bandmasks, null);

src/java.desktop/share/classes/java/awt/peer/RobotPeer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -117,4 +117,14 @@ public interface RobotPeer
      * @see Robot#createScreenCapture(Rectangle)
      */
     int[] getRGBPixels(Rectangle bounds);
+
+    /**
+     * Determines if absolute coordinates should be used by this peer.
+     *
+     * @return {@code true} if absolute coordinates should be used,
+     *         {@code false} otherwise
+     */
+    default boolean useAbsoluteCoordinates() {
+        return false;
+    }
 }

src/java.desktop/share/classes/sun/java2d/SunGraphicsEnvironment.java

@@ -27,6 +27,7 @@
 
 import java.awt.AWTError;
 import java.awt.Color;
+import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.Graphics2D;
 import java.awt.GraphicsConfiguration;
@@ -349,53 +350,124 @@ public static GraphicsConfiguration getGraphicsConfigurationAtPoint(
     }
 
     /**
-     * Converts coordinates from the user's space to the device space using
-     * appropriate device transformation.
+     * Returns the bounds of the graphics configuration in device space.
+     *
+     * @param  config the graphics configuration which bounds are requested
+     * @return the bounds of the area covered by this
+     *         {@code GraphicsConfiguration} in device space (pixels)
+     */
+    public static Rectangle getGCDeviceBounds(GraphicsConfiguration config) {
+        AffineTransform tx = config.getDefaultTransform();
+        Rectangle bounds = config.getBounds();
+        bounds.width *= tx.getScaleX();
+        bounds.height *= tx.getScaleY();
+        return bounds;
+    }
+
+    /**
+     * Converts the size (w, h) from the device space to the user's space using
+     * passed graphics configuration.
+     *
+     * @param  gc the graphics configuration to be used for transformation
+     * @param  w the width in the device space
+     * @param  h the height in the device space
+     * @return the size in the user's space
+     */
+    public static Dimension toUserSpace(GraphicsConfiguration gc,
+                                        int w, int h) {
+        AffineTransform tx = gc.getDefaultTransform();
+        return new Dimension(
+                Region.clipRound(w / tx.getScaleX()),
+                Region.clipRound(h / tx.getScaleY())
+        );
+    }
+
+    /**
+     * Converts absolute coordinates from the user's space to the device space
+     * using appropriate device transformation.
      *
-     * @param  x coordinate in the user space
-     * @param  y coordinate in the user space
-     * @return the point which uses device space(pixels)
+     * @param  x absolute coordinate in the user's space
+     * @param  y absolute coordinate in the user's space
+     * @return the point which uses device space (pixels)
      */
-    public static Point convertToDeviceSpace(double x, double y) {
+    public static Point toDeviceSpaceAbs(int x, int y) {
         GraphicsConfiguration gc = getLocalGraphicsEnvironment()
-                        .getDefaultScreenDevice().getDefaultConfiguration();
+                .getDefaultScreenDevice().getDefaultConfiguration();
         gc = getGraphicsConfigurationAtPoint(gc, x, y);
+        return toDeviceSpaceAbs(gc, x, y, 0, 0).getLocation();
+    }
 
+    /**
+     * Converts the rectangle from the user's space to the device space using
+     * appropriate device transformation.
+     *
+     * @param  rect the rectangle in the user's space
+     * @return the rectangle which uses device space (pixels)
+     */
+    public static Rectangle toDeviceSpaceAbs(Rectangle rect) {
+        GraphicsConfiguration gc = getLocalGraphicsEnvironment()
+                .getDefaultScreenDevice().getDefaultConfiguration();
+        gc = getGraphicsConfigurationAtPoint(gc, rect.x, rect.y);
+        return toDeviceSpaceAbs(gc, rect.x, rect.y, rect.width, rect.height);
+    }
+
+    /**
+     * Converts absolute coordinates (x, y) and the size (w, h) from the user's
+     * space to the device space using passed graphics configuration.
+     *
+     * @param  gc the graphics configuration to be used for transformation
+     * @param  x absolute coordinate in the user's space
+     * @param  y absolute coordinate in the user's space
+     * @param  w the width in the user's space
+     * @param  h the height in the user's space
+     * @return the rectangle which uses device space (pixels)
+     */
+    public static Rectangle toDeviceSpaceAbs(GraphicsConfiguration gc,
+                                             int x, int y, int w, int h) {
         AffineTransform tx = gc.getDefaultTransform();
-        x = Region.clipRound(x * tx.getScaleX());
-        y = Region.clipRound(y * tx.getScaleY());
-        return new Point((int) x, (int) y);
+        Rectangle screen = gc.getBounds();
+        return new Rectangle(
+                screen.x + Region.clipRound((x - screen.x) * tx.getScaleX()),
+                screen.y + Region.clipRound((y - screen.y) * tx.getScaleY()),
+                Region.clipRound(w * tx.getScaleX()),
+                Region.clipRound(h * tx.getScaleY())
+        );
     }
 
     /**
-     * Converts bounds from the user's space to the device space using
+     * Converts coordinates from the user's space to the device space using
      * appropriate device transformation.
      *
-     * @param  bounds the rectangle in the user space
-     * @return the rectangle which uses device space(pixels)
+     * @param  x coordinate in the user's space
+     * @param  y coordinate in the user's space
+     * @return the point which uses device space (pixels)
      */
-    public static Rectangle convertToDeviceSpace(Rectangle bounds) {
+    public static Point toDeviceSpace(int x, int y) {
         GraphicsConfiguration gc = getLocalGraphicsEnvironment()
                 .getDefaultScreenDevice().getDefaultConfiguration();
-        gc = getGraphicsConfigurationAtPoint(gc, bounds.x, bounds.y);
-        return convertToDeviceSpace(gc, bounds);
+        gc = getGraphicsConfigurationAtPoint(gc, x, y);
+        return toDeviceSpace(gc, x, y, 0, 0).getLocation();
     }
 
     /**
-     * Converts bounds from the user's space to the device space using
-     * appropriate device transformation of the passed graphics configuration.
+     * Converts coordinates (x, y) and the size (w, h) from the user's
+     * space to the device space using passed graphics configuration.
      *
-     * @param  bounds the rectangle in the user space
-     * @return the rectangle which uses device space(pixels)
+     * @param  gc the graphics configuration to be used for transformation
+     * @param  x coordinate in the user's space
+     * @param  y coordinate in the user's space
+     * @param  w the width in the user's space
+     * @param  h the height in the user's space
+     * @return the rectangle which uses device space (pixels)
      */
-    public static Rectangle convertToDeviceSpace(GraphicsConfiguration gc,
-                                                 Rectangle bounds) {
+    public static Rectangle toDeviceSpace(GraphicsConfiguration gc,
+                                          int x, int y, int w, int h) {
         AffineTransform tx = gc.getDefaultTransform();
         return new Rectangle(
-                Region.clipRound(bounds.x * tx.getScaleX()),
-                Region.clipRound(bounds.y * tx.getScaleY()),
-                Region.clipRound(bounds.width * tx.getScaleX()),
-                Region.clipRound(bounds.height * tx.getScaleY())
+                Region.clipRound(x * tx.getScaleX()),
+                Region.clipRound(y * tx.getScaleY()),
+                Region.clipRound(w * tx.getScaleX()),
+                Region.clipRound(h * tx.getScaleY())
         );
     }
 }

src/java.desktop/windows/classes/sun/awt/Win32GraphicsDevice.java

@@ -467,7 +467,7 @@ public synchronized void setDisplayMode(DisplayMode dm) {
             // display mode
             Rectangle screenBounds = getDefaultConfiguration().getBounds();
             w.setBounds(screenBounds.x, screenBounds.y,
-                        dm.getWidth(), dm.getHeight());
+                        screenBounds.width, screenBounds.height);
             // Note: no call to replaceSurfaceData is required here since
             // replacement will be caused by an upcoming display change event
         } else {

src/java.desktop/windows/classes/sun/awt/windows/WComponentPeer.java

@@ -533,7 +533,11 @@ public void run() {
 
     @Override
     public boolean updateGraphicsData(GraphicsConfiguration gc) {
+        var old = getGraphicsConfiguration().getDefaultTransform();
         winGraphicsConfig = (Win32GraphicsConfig)gc;
+        if (gc != null && !old.equals(gc.getDefaultTransform())) {
+            syncBounds(); // the bounds of the peer depend on the DPI
+        }
         try {
             replaceSurfaceData();
         } catch (InvalidPipeException e) {
@@ -542,6 +546,14 @@ public boolean updateGraphicsData(GraphicsConfiguration gc) {
         return false;
     }
 
+    /**
+     * Make sure that the native peer's coordinates are in sync with the target.
+     */
+    void syncBounds() {
+        Rectangle r = ((Component) target).getBounds();
+        setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS);
+    }
+
     //This will return null for Components not yet added to a Container
     @Override
     public ColorModel getColorModel() {

src/java.desktop/windows/classes/sun/awt/windows/WDialogPeer.java

@@ -36,6 +36,8 @@
 import sun.awt.AWTAccessor;
 import sun.awt.im.InputMethodManager;
 
+import static sun.java2d.SunGraphicsEnvironment.toUserSpace;
+
 final class WDialogPeer extends WWindowPeer implements DialogPeer {
     // Toolkit & peer internals
 
@@ -117,8 +119,8 @@ public Dimension getMinimumSize() {
         if (((Dialog)target).isUndecorated()) {
             return super.getMinimumSize();
         }
-        return new Dimension(scaleDownX(getSysMinWidth()),
-                             scaleDownY(getSysMinHeight()));
+        return toUserSpace(getGraphicsConfiguration(),
+                           getSysMinWidth(), getSysMinHeight());
     }
 
     @Override

src/java.desktop/windows/classes/sun/awt/windows/WFramePeer.java

@@ -38,7 +38,9 @@
 import sun.awt.im.InputMethodManager;
 import sun.security.action.GetPropertyAction;
 
-import static sun.java2d.SunGraphicsEnvironment.convertToDeviceSpace;
+import static sun.java2d.SunGraphicsEnvironment.getGCDeviceBounds;
+import static sun.java2d.SunGraphicsEnvironment.toDeviceSpaceAbs;
+import static sun.java2d.SunGraphicsEnvironment.toUserSpace;
 
 class WFramePeer extends WWindowPeer implements FramePeer {
 
@@ -97,10 +99,9 @@ public final void setMaximizedBounds(Rectangle b) {
      */
     private Rectangle adjustMaximizedBounds(Rectangle bounds) {
         // All calculations should be done in the device space
-        bounds = convertToDeviceSpace(bounds);
-
+        bounds = toDeviceSpaceAbs(bounds);
         GraphicsConfiguration gc = getGraphicsConfiguration();
-        Rectangle currentDevBounds = convertToDeviceSpace(gc, gc.getBounds());
+        Rectangle currentDevBounds = getGCDeviceBounds(gc);
         // Prepare data for WM_GETMINMAXINFO message.
         // ptMaxPosition should be in coordinate system of the current monitor,
         // not the main monitor, or monitor on which we maximize the window.
@@ -148,13 +149,13 @@ public void reshape(int x, int y, int width, int height) {
 
     @Override
     public final Dimension getMinimumSize() {
+        GraphicsConfiguration gc = getGraphicsConfiguration();
         Dimension d = new Dimension();
         if (!((Frame)target).isUndecorated()) {
-            d.setSize(scaleDownX(getSysMinWidth()),
-                      scaleDownY(getSysMinHeight()));
+            d.setSize(toUserSpace(gc, getSysMinWidth(), getSysMinHeight()));
         }
-        if (((Frame)target).getMenuBar() != null) {
-            d.height += scaleDownY(getSysMenuHeight());
+        if (((Frame) target).getMenuBar() != null) {
+            d.height += toUserSpace(gc, 0, getSysMenuHeight()).height;
         }
         return d;
     }

src/java.desktop/windows/classes/sun/awt/windows/WRobotPeer.java

@@ -29,14 +29,14 @@
 import java.awt.Rectangle;
 import java.awt.peer.RobotPeer;
 
-import sun.java2d.SunGraphicsEnvironment;
+import static sun.java2d.SunGraphicsEnvironment.toDeviceSpaceAbs;
 
 final class WRobotPeer implements RobotPeer {
 
     public native void mouseMoveImpl(int x, int y);
     @Override
     public void mouseMove(int x, int y) {
-        Point point = SunGraphicsEnvironment.convertToDeviceSpace(x, y);
+        Point point = toDeviceSpaceAbs(x, y);
         mouseMoveImpl(point.x, point.y);
     }
     @Override
@@ -64,5 +64,10 @@ public int getRGBPixel(int x, int y) {
         return pixelArray;
     }
 
+    @Override
+    public boolean useAbsoluteCoordinates() {
+        return true;
+    }
+
     private native void getRGBPixels(int x, int y, int width, int height, int[] pixelArray);
 }