001 /*
002 * AdobeCompositeContext.java
003 *
004 *
005 * The Salamander Project - 2D and 3D graphics libraries in Java
006 * Copyright (C) 2004 Mark McKay
007 *
008 * This library is free software; you can redistribute it and/or
009 * modify it under the terms of the GNU Lesser General Public
010 * License as published by the Free Software Foundation; either
011 * version 2.1 of the License, or (at your option) any later version.
012 *
013 * This library is distributed in the hope that it will be useful,
014 * but WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
016 * Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public
019 * License along with this library; if not, write to the Free Software
020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
021 *
022 * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
023 * projects can be found at http://www.kitfox.com
024 *
025 * Created on April 1, 2004, 6:41 AM
026 */
027
028 package com.kitfox.svg.composite;
029
030 import java.awt.*;
031 import java.awt.image.*;
032
033 /**
034 * @author Mark McKay
035 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
036 */
037 public class AdobeCompositeContext implements CompositeContext
038 {
039 final int compositeType;
040 final float extraAlpha;
041
042 float[] rgba_src = new float[4];
043 float[] rgba_dstIn = new float[4];
044 float[] rgba_dstOut = new float[4];
045
046 /** Creates a new instance of AdobeCompositeContext */
047 public AdobeCompositeContext(int compositeType, float extraAlpha)
048 {
049 this.compositeType = compositeType;
050 this.extraAlpha = extraAlpha;
051
052 rgba_dstOut[3] = 1f;
053 }
054
055 public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
056 {
057 int width = src.getWidth();
058 int height = src.getHeight();
059
060 for (int j = 0; j < height; j++)
061 {
062 for (int i = 0; i < width; i++)
063 {
064 src.getPixel(i, j, rgba_src);
065 dstIn.getPixel(i, j, rgba_dstIn);
066
067 //Ignore transparent pixels
068 if (rgba_src[3] == 0)
069 {
070 // dstOut.setPixel(i, j, rgba_dstIn);
071 continue;
072 }
073
074 float alpha = rgba_src[3];
075
076 switch (compositeType)
077 {
078 default:
079 case AdobeComposite.CT_NORMAL:
080 rgba_dstOut[0] = rgba_src[0] * alpha + rgba_dstIn[0] * (1f - alpha);
081 rgba_dstOut[1] = rgba_src[1] * alpha + rgba_dstIn[1] * (1f - alpha);
082 rgba_dstOut[2] = rgba_src[2] * alpha + rgba_dstIn[2] * (1f - alpha);
083 break;
084 case AdobeComposite.CT_MULTIPLY:
085 rgba_dstOut[0] = rgba_src[0] * rgba_dstIn[0] * alpha + rgba_dstIn[0] * (1f - alpha);
086 rgba_dstOut[1] = rgba_src[1] * rgba_dstIn[1] * alpha + rgba_dstIn[1] * (1f - alpha);
087 rgba_dstOut[2] = rgba_src[2] * rgba_dstIn[2] * alpha + rgba_dstIn[2] * (1f - alpha);
088 break;
089 }
090 }
091 }
092 }
093
094 public void dispose() {
095 }
096
097 }