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1   /*
2    * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package sun.awt;
27  
28  /**
29   * Interface used by Swing to make copies from the Swing back buffer
30   * more optimal when using BufferStrategy; no need to copy the entire
31   * buffer when only a small sub-region has changed.
32   * @see javax.swing.BufferStrategyPaintManager
33   *
34   */
35  public interface SubRegionShowable {
36      /**
37       * Shows the specific subregion.
38       */
39      public void show(int x1, int y1, int x2, int y2);
40  
41      /**
42       * Shows the specified region if the buffer is not lost and the dimensions
43       * of the back-buffer match those of the component.
44       *
45       * @return true if successful
46       */
47      // NOTE: this is invoked by swing on the toolkit thread!
48      public boolean showIfNotLost(int x1, int y1, int x2, int y2);
49  }