Effect


1   /*
2    * @(#)Effect.java  1.2 07/12/12
3    *
4    * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   package com.sun.java.swing.plaf.nimbus;
8   
9   import sun.awt.AppContext;
10  
11  import java.awt.image.BufferedImage  ;
12  import java.lang.ref.SoftReference  ;
13  
14  /**
15   * Effect
16   *
17   * @author Created by Jasper Potts (Jun 18, 2007)
18   * @version 1.0
19   */
20  abstract class Effect {
21      enum EffectType {
22          UNDER, BLENDED, OVER
23      }
24  
25      // =================================================================================================================
26      // Abstract Methods
27  
28      /**
29       * Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the result of apply effect should be painted
30       * under the src image. BLENDED means the result of apply sffect contains a modified src image so just it should be
31       * painted. OVER means the result of apply effect should be painted over the src image.
32       *
33       * @return The effect type
34       */
35      abstract EffectType getEffectType();
36  
37      /**
38       * Get the opacity to use to paint the result effected image if the EffectType is UNDER or OVER.
39       *
40       * @return The opactity for the effect, 0.0f -> 1.0f
41       */
42      abstract float getOpacity();
43  
44      /**
45       * Apply the effect to the src image generating the result . The result image may or may not contain the source
46       * image depending on what the effect type is.
47       *
48       * @param src The source image for applying the effect to
49       * @param dst The dstination image to paint effect result into. If this is null then a new image will be created
50       * @param w   The width of the src image to apply effect to, this allow the src and dst buffers to be bigger than
51       *            the area the need effect applied to it
52       * @param h   The height of the src image to apply effect to, this allow the src and dst buffers to be bigger than
53       *            the area the need effect applied to it
54       * @return The result of appl
55       */
56      abstract BufferedImage   applyEffect(BufferedImage   src, BufferedImage   dst, int w, int h);
57  
58      // =================================================================================================================
59      // Static data cache
60  
61      protected static ArrayCache getArrayCache() {
62          ArrayCache cache = (ArrayCache)AppContext.getAppContext().get(ArrayCache.class);
63          if (cache == null){
64              cache = new ArrayCache();
65              AppContext.getAppContext().put(ArrayCache.class,cache);
66          }
67          return cache;
68      }
69  
70      protected static class ArrayCache {
71          private SoftReference  <int[]> tmpIntArray = null;
72          private SoftReference  <byte[]> tmpByteArray1 = null;
73          private SoftReference  <byte[]> tmpByteArray2 = null;
74          private SoftReference  <byte[]> tmpByteArray3 = null;
75  
76          protected int[] getTmpIntArray(int size) {
77              int[] tmp;
78              if (tmpIntArray == null || (tmp = tmpIntArray.get()) == null || tmp.length < size) {
79                  // create new array
80                  tmp = new int[size];
81                  tmpIntArray = new SoftReference  <int[]>(tmp);
82              }
83              return tmp;
84          }
85  
86          protected byte[] getTmpByteArray1(int size) {
87              byte[] tmp;
88              if (tmpByteArray1 == null || (tmp = tmpByteArray1.get()) == null || tmp.length < size) {
89                  // create new array
90                  tmp = new byte[size];
91                  tmpByteArray1 = new SoftReference  <byte[]>(tmp);
92              }
93              return tmp;
94          }
95  
96          protected byte[] getTmpByteArray2(int size) {
97              byte[] tmp;
98              if (tmpByteArray2 == null || (tmp = tmpByteArray2.get()) == null || tmp.length < size) {
99                  // create new array
100                 tmp = new byte[size];
101                 tmpByteArray2 = new SoftReference  <byte[]>(tmp);
102             }
103             return tmp;
104         }
105 
106         protected byte[] getTmpByteArray3(int size) {
107             byte[] tmp;
108             if (tmpByteArray3 == null || (tmp = tmpByteArray3.get()) == null || tmp.length < size) {
109                 // create new array
110                 tmp = new byte[size];
111                 tmpByteArray3 = new SoftReference  <byte[]>(tmp);
112             }
113             return tmp;
114         }
115     }
116 }
117
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