[NETBEANS-3592] Workarounds for JDK Windows LAF bugs on HiDPI screens (…

…#1777)

Details:
1) Fix tiny or huge GUI font size.
2) Fix tiny or huge UI control icons. (Workaround for JDK-8211715.)
3) Fix uneven borders on text components on non-integral HiDPI scaling factors (e.g. 150%).

See JIRA issue for more details, screenshots, and a manual test plan.

platform/o.n.swing.plaf/src/org/netbeans/swing/plaf/AllLFCustoms.java

@@ -154,6 +154,7 @@ public static void initCustomFontSize (int uiFontSize) {
         switchFont("windowTitleFont", fontTranslation, uiFontSize, nbDialogBold); // NOI18N
         switchFont("Spinner.font", fontTranslation, uiFontSize, nbDialogPlain); // NOI18N
         switchFont("FormattedTextField.font", fontTranslation, uiFontSize, nbDialogPlain); // NOI18N
+        switchFont("Slider.font", fontTranslation, uiFontSize, nbDialogPlain); // NOI18N
     }
 
     //#144402

platform/o.n.swing.plaf/src/org/netbeans/swing/plaf/windows8/DPIUnscaledBorder.java

@@ -0,0 +1,105 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.netbeans.swing.plaf.windows8;
+
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.geom.AffineTransform;
+import javax.swing.border.Border;
+import javax.swing.plaf.UIResource;
+
+// Must implement UIResource to work with JSpinner.
+/**
+ * A delegating border which disregards border thickness DPI scaling for painting purposes. For
+ * example, a border with a logical width of one pixel will be painted as one device pixel thick,
+ * even on 200% DPI scaling. This is the behavior seen, for instance, in native text components on
+ * Windows 10. This also avoids visual artifacts from rounding errors under non-integral DPI scaling
+ * factors (e.g. 150%).
+ *
+ * <p>Insets reported by {@link #getBorderInsets(Component)} will still reflect the originally
+ * specified values.
+ */
+final class DPIUnscaledBorder implements Border, UIResource {
+    private final Border delegate;
+
+    public DPIUnscaledBorder(Border delegate) {
+        if (delegate == null) {
+            throw new NullPointerException();
+        }
+        this.delegate = delegate;
+    }
+
+    @Override
+    public void paintBorder(Component c, Graphics g0, int x, int y, int width, int height) {
+        final Graphics2D g = (Graphics2D) g0;
+        final AffineTransform oldTransform = g.getTransform();
+        g.translate(x, y);
+        final AffineTransform tx = g.getTransform();
+        final int txType = tx.getType();
+        /* On fractional DPI scaling factors, such as 150%, a logical pixel position, e.g. (5,0),
+        may end up being translated to a non-integral device pixel position, e.g. (7.5, 0). The same
+        goes for border thicknesses, which are specified in logical pixels. In this method, we do
+        all calculations and painting in device pixels, to avoid rounding errors causing visible
+        artifacts. On screens without HiDPI scaling, logical pixel values and device pixel values
+        are identical, and always integral (whole number) values. */
+        final int deviceWidth;
+        final int deviceHeight;
+        if (txType == AffineTransform.TYPE_UNIFORM_SCALE ||
+            txType == (AffineTransform.TYPE_UNIFORM_SCALE | AffineTransform.TYPE_TRANSLATION))
+        {
+            // HiDPI scaling is active.
+            double scale = tx.getScaleX();
+            /* To be completely safe from overpainting the previous adjacent component, we would
+            probably need to round up here. But for borders to work properly on JTextField, we
+            must round down. And it seems to work fine in the
+            EDITOR_TAB_CONTENT_BORDER/VIEW_TAB_CONTENT_BORDER cases as well. */
+            int deviceX = (int) tx.getTranslateX();
+            int deviceY = (int) tx.getTranslateY();
+            /* Rounding down here should guarantee that we do not paint in an area that will be
+            painted over by the next adjacent component. Rounding up, or to the nearest integer,
+            is confirmed to cause problems. */
+            int deviceXend = (int) (tx.getTranslateX() + width * scale);
+            int deviceYend = (int) (tx.getTranslateY() + height * scale);
+            deviceWidth = deviceXend - deviceX;
+            deviceHeight = deviceYend - deviceY;
+            /* Deactivate the HiDPI scaling transform so we can do paint operations in the device
+            pixel coordinate system instead of in the logical coordinate system. */
+            g.setTransform(new AffineTransform(1, 0, 0, 1, deviceX, deviceY));
+        } else {
+            deviceWidth = width;
+            deviceHeight = height;
+        }
+        delegate.paintBorder(c, g, 0, 0, deviceWidth, deviceHeight);
+        g.setTransform(oldTransform);
+    }
+
+    @Override
+    public Insets getBorderInsets(Component c) {
+        return delegate.getBorderInsets(c);
+    }
+
+    @Override
+    public boolean isBorderOpaque() {
+        /* Since we do not widen borders under DPI scaling, we may not always fill in the entire
+        designated logical area. */
+        return false;
+    }
+}