IDEA-173017 JavaFX WebView not HiDPI rendering on Windows 10

platform/util/src/com/intellij/util/FieldAccessor.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2000-2017 JetBrains s.r.o.
+ *
+ * Licensed 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 com.intellij.util;
+
+import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.util.Ref;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Field;
+
+/**
+ * Thread unsafe field accessor.
+ * @param <T> the type of the field
+ */
+public class FieldAccessor<T> {
+  private static final Logger LOG = Logger.getInstance("#com.intellij.util.FieldAccessor");
+
+  private Ref<Field> myFieldRef;
+  private final Class<?> myClass;
+  private final String myName;
+
+  public FieldAccessor(@NotNull Class<?> cls, @NotNull String name) {
+    myClass = cls;
+    myName = name;
+  }
+
+  public boolean isAvailable() {
+    if (myFieldRef == null) {
+      try {
+        myFieldRef = new Ref<Field>();
+        myFieldRef.set(myClass.getDeclaredField(myName));
+        myFieldRef.get().setAccessible(true);
+      }
+      catch (NoSuchFieldException e) {
+        LOG.warn("Field not found: " + myClass.getName() + "." + myName);
+      }
+    }
+    return myFieldRef.get() != null;
+  }
+
+  public T get(@Nullable Object object) {
+    if (!isAvailable() || object == null) return null;
+    try {
+      @SuppressWarnings("unchecked")
+      T value = (T)myFieldRef.get().get(object);
+      return value;
+    }
+    catch (IllegalAccessException e) {
+      LOG.warn("Field not accessible: " + myClass.getName() + "." + myName);
+    }
+    return null;
+  }
+
+  public void set(@Nullable Object object, @Nullable T value) {
+    if (!isAvailable() || object == null) return;
+    try {
+      myFieldRef.get().set(object, value);
+    }
+    catch (IllegalAccessException e) {
+      LOG.warn("Field not accessible: " + myClass.getName() + "." + myName);
+    }
+  }
+}