001/*
002 * SVG Salamander
003 * Copyright (c) 2004, Mark McKay
004 * All rights reserved.
005 *
006 * Redistribution and use in source and binary forms, with or 
007 * without modification, are permitted provided that the following
008 * conditions are met:
009 *
010 *   - Redistributions of source code must retain the above 
011 *     copyright notice, this list of conditions and the following
012 *     disclaimer.
013 *   - Redistributions in binary form must reproduce the above
014 *     copyright notice, this list of conditions and the following
015 *     disclaimer in the documentation and/or other materials 
016 *     provided with the distribution.
017 *
018 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
019 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
020 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
021 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
022 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
023 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
025 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
026 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
027 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
029 * OF THE POSSIBILITY OF SUCH DAMAGE. 
030 * 
031 * Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
032 * projects can be found at http://www.kitfox.com
033 *
034 * Created on April 1, 2004, 6:41 AM
035 */
036
037package com.kitfox.svg.composite;
038
039import java.awt.*;
040import java.awt.image.*;
041
042/**
043 * @author Mark McKay
044 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
045 */
046public class AdobeCompositeContext implements CompositeContext
047{
048    final int compositeType;
049    final float extraAlpha;
050
051    float[] rgba_src = new float[4];
052    float[] rgba_dstIn = new float[4];
053    float[] rgba_dstOut = new float[4];
054
055    /** Creates a new instance of AdobeCompositeContext
056     * @param compositeType
057     * @param extraAlpha
058     */
059    public AdobeCompositeContext(int compositeType, float extraAlpha)
060    {
061        this.compositeType = compositeType;
062        this.extraAlpha = extraAlpha;
063
064        rgba_dstOut[3] = 1f;
065    }
066
067    public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
068    {
069        int width = src.getWidth();
070        int height = src.getHeight();
071
072        for (int j = 0; j < height; j++)
073        {
074            for (int i = 0; i < width; i++)
075            {
076                src.getPixel(i, j, rgba_src);
077                dstIn.getPixel(i, j, rgba_dstIn);
078
079                //Ignore transparent pixels
080                if (rgba_src[3] == 0)
081                {
082//                    dstOut.setPixel(i, j, rgba_dstIn);
083                    continue;
084                }
085
086                float alpha = rgba_src[3];
087
088                switch (compositeType)
089                {
090                    default:
091                    case AdobeComposite.CT_NORMAL:
092                        rgba_dstOut[0] = rgba_src[0] * alpha + rgba_dstIn[0] * (1f - alpha);
093                        rgba_dstOut[1] = rgba_src[1] * alpha + rgba_dstIn[1] * (1f - alpha);
094                        rgba_dstOut[2] = rgba_src[2] * alpha + rgba_dstIn[2] * (1f - alpha);
095                        break;
096                    case AdobeComposite.CT_MULTIPLY:
097                        rgba_dstOut[0] = rgba_src[0] * rgba_dstIn[0] * alpha + rgba_dstIn[0] * (1f - alpha);
098                        rgba_dstOut[1] = rgba_src[1] * rgba_dstIn[1] * alpha + rgba_dstIn[1] * (1f - alpha);
099                        rgba_dstOut[2] = rgba_src[2] * rgba_dstIn[2] * alpha + rgba_dstIn[2] * (1f - alpha);
100                        break;
101                }
102            }
103        }
104    }
105
106    public void dispose() {
107    }
108
109}