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    public AdobeCompositeContext(int compositeType, float extraAlpha)
057    {
058        this.compositeType = compositeType;
059        this.extraAlpha = extraAlpha;
060
061        rgba_dstOut[3] = 1f;
062    }
063
064    public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
065    {
066        int width = src.getWidth();
067        int height = src.getHeight();
068
069        for (int j = 0; j < height; j++)
070        {
071            for (int i = 0; i < width; i++)
072            {
073                src.getPixel(i, j, rgba_src);
074                dstIn.getPixel(i, j, rgba_dstIn);
075
076                //Ignore transparent pixels
077                if (rgba_src[3] == 0)
078                {
079//                    dstOut.setPixel(i, j, rgba_dstIn);
080                    continue;
081                }
082
083                float alpha = rgba_src[3];
084
085                switch (compositeType)
086                {
087                    default:
088                    case AdobeComposite.CT_NORMAL:
089                        rgba_dstOut[0] = rgba_src[0] * alpha + rgba_dstIn[0] * (1f - alpha);
090                        rgba_dstOut[1] = rgba_src[1] * alpha + rgba_dstIn[1] * (1f - alpha);
091                        rgba_dstOut[2] = rgba_src[2] * alpha + rgba_dstIn[2] * (1f - alpha);
092                        break;
093                    case AdobeComposite.CT_MULTIPLY:
094                        rgba_dstOut[0] = rgba_src[0] * rgba_dstIn[0] * alpha + rgba_dstIn[0] * (1f - alpha);
095                        rgba_dstOut[1] = rgba_src[1] * rgba_dstIn[1] * alpha + rgba_dstIn[1] * (1f - alpha);
096                        rgba_dstOut[2] = rgba_src[2] * rgba_dstIn[2] * alpha + rgba_dstIn[2] * (1f - alpha);
097                        break;
098                }
099            }
100        }
101    }
102
103    public void dispose() {
104    }
105
106}