1 /*
2  * Copyright (c) 2005, 2006, 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
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8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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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).
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17  * You should have received a copy of the GNU General Public License version
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24  */
25 package javax.swing.plaf.nimbus;
26 
27 import java.awt.image.BufferedImage;
28 import java.awt.image.Raster;
29 import java.awt.image.WritableRaster;
30 import java.util.Arrays;
31 
32 /**
33  * InnerShadowEffect - This effect currently only works with ARGB type buffered
34  * images.
35  *
36  * @author Created by Jasper Potts (Jun 18, 2007)
37  */
38 class InnerShadowEffect extends ShadowEffect {
39 
40     // =================================================================================================================
41     // Effect Methods
42 
43     /**
44      * Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the result of apply effect should be painted
45      * under the src image. BLENDED means the result of apply sffect contains a modified src image so just it should be
46      * painted. OVER means the result of apply effect should be painted over the src image.
47      *
48      * @return The effect type
49      */
getEffectType()50     Effect.EffectType getEffectType() {
51         return Effect.EffectType.OVER;
52     }
53 
54     /**
55      * Apply the effect to the src image generating the result . The result image may or may not contain the source
56      * image depending on what the effect type is.
57      *
58      * @param src The source image for applying the effect to
59      * @param dst The dstination image to paint effect result into. If this is null then a new image will be created
60      * @param w   The width of the src image to apply effect to, this allow the src and dst buffers to be bigger than
61      *            the area the need effect applied to it
62      * @param h   The height of the src image to apply effect to, this allow the src and dst buffers to be bigger than
63      *            the area the need effect applied to it
64      * @return Image with the result of the effect
65      */
applyEffect(BufferedImage src, BufferedImage dst, int w, int h)66     BufferedImage applyEffect(BufferedImage src, BufferedImage dst, int w, int h) {
67         if (src == null || src.getType() != BufferedImage.TYPE_INT_ARGB){
68             throw new IllegalArgumentException("Effect only works with " +
69                     "source images of type BufferedImage.TYPE_INT_ARGB.");
70         }
71         if (dst != null && dst.getType() != BufferedImage.TYPE_INT_ARGB){
72             throw new IllegalArgumentException("Effect only works with " +
73                     "destination images of type BufferedImage.TYPE_INT_ARGB.");
74         }
75         // calculate offset
76         double trangleAngle = Math.toRadians(angle - 90);
77         int offsetX = (int) (Math.sin(trangleAngle) * distance);
78         int offsetY = (int) (Math.cos(trangleAngle) * distance);
79         // clac expanded size
80         int tmpOffX = offsetX + size;
81         int tmpOffY = offsetX + size;
82         int tmpW = w + offsetX + size + size;
83         int tmpH = h + offsetX + size;
84         // create tmp buffers
85         int[] lineBuf = getArrayCache().getTmpIntArray(w);
86         byte[] srcAlphaBuf = getArrayCache().getTmpByteArray1(tmpW * tmpH);
87         Arrays.fill(srcAlphaBuf, (byte) 0xFF);
88         byte[] tmpBuf1 = getArrayCache().getTmpByteArray2(tmpW * tmpH);
89         byte[] tmpBuf2 = getArrayCache().getTmpByteArray3(tmpW * tmpH);
90         // extract src image alpha channel and inverse and offset
91         Raster srcRaster = src.getRaster();
92         for (int y = 0; y < h; y++) {
93             int dy = (y + tmpOffY);
94             int offset = dy * tmpW;
95             srcRaster.getDataElements(0, y, w, 1, lineBuf);
96             for (int x = 0; x < w; x++) {
97                 int dx = x + tmpOffX;
98                 srcAlphaBuf[offset + dx] = (byte) ((255 - ((lineBuf[x] & 0xFF000000) >>> 24)) & 0xFF);
99             }
100         }
101         // blur
102         float[] kernel = EffectUtils.createGaussianKernel(size * 2);
103         EffectUtils.blur(srcAlphaBuf, tmpBuf2, tmpW, tmpH, kernel, size * 2); // horizontal pass
104         EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size * 2);// vertical pass
105         //rescale
106         float spread = Math.min(1 / (1 - (0.01f * this.spread)), 255);
107         for (int i = 0; i < tmpBuf1.length; i++) {
108             int val = (int) (((int) tmpBuf1[i] & 0xFF) * spread);
109             tmpBuf1[i] = (val > 255) ? (byte) 0xFF : (byte) val;
110         }
111         // create color image with shadow color and greyscale image as alpha
112         if (dst == null) dst = new BufferedImage(w, h,
113                 BufferedImage.TYPE_INT_ARGB);
114         WritableRaster shadowRaster = dst.getRaster();
115         int red = color.getRed(), green = color.getGreen(), blue = color.getBlue();
116         for (int y = 0; y < h; y++) {
117             int srcY = y + tmpOffY;
118             int offset = srcY * tmpW;
119             int shadowOffset = (srcY - offsetY) * tmpW;
120             for (int x = 0; x < w; x++) {
121                 int srcX = x + tmpOffX;
122                 int origianlAlphaVal = 255 - ((int) srcAlphaBuf[offset + srcX] & 0xFF);
123                 int shadowVal = (int) tmpBuf1[shadowOffset + (srcX - offsetX)] & 0xFF;
124                 int alphaVal = Math.min(origianlAlphaVal, shadowVal);
125                 lineBuf[x] = ((byte) alphaVal & 0xFF) << 24 | red << 16 | green << 8 | blue;
126             }
127             shadowRaster.setDataElements(0, y, w, 1, lineBuf);
128         }
129         return dst;
130     }
131 }
132