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/*
* AdobeCompositeContext.java
*
*
* The Salamander Project - 2D and 3D graphics libraries in Java
* Copyright (C) 2004 Mark McKay
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Mark McKay can be contacted at mark@kitfox.com. Salamander and other
* projects can be found at http://www.kitfox.com
*
* Created on April 1, 2004, 6:41 AM
*/
package com.kitfox.svg.composite;
import java.awt.*;
import java.awt.image.*;
/**
* @author Mark McKay
* @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
*/
public class AdobeCompositeContext implements CompositeContext
{
final int compositeType;
final float extraAlpha;
float[] rgba_src = new float[4];
float[] rgba_dstIn = new float[4];
float[] rgba_dstOut = new float[4];
/** Creates a new instance of AdobeCompositeContext */
public AdobeCompositeContext(int compositeType, float extraAlpha)
{
this.compositeType = compositeType;
this.extraAlpha = extraAlpha;
rgba_dstOut[3] = 1f;
}
public void compose(Raster src, Raster dstIn, WritableRaster dstOut)
{
int width = src.getWidth();
int height = src.getHeight();
for (int j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
{
src.getPixel(i, j, rgba_src);
dstIn.getPixel(i, j, rgba_dstIn);
//Ignore transparent pixels
if (rgba_src[3] == 0)
{
// dstOut.setPixel(i, j, rgba_dstIn);
continue;
}
float alpha = rgba_src[3];
switch (compositeType)
{
default:
case AdobeComposite.CT_NORMAL:
rgba_dstOut[0] = rgba_src[0] * alpha + rgba_dstIn[0] * (1f - alpha);
rgba_dstOut[1] = rgba_src[1] * alpha + rgba_dstIn[1] * (1f - alpha);
rgba_dstOut[2] = rgba_src[2] * alpha + rgba_dstIn[2] * (1f - alpha);
break;
case AdobeComposite.CT_MULTIPLY:
rgba_dstOut[0] = rgba_src[0] * rgba_dstIn[0] * alpha + rgba_dstIn[0] * (1f - alpha);
rgba_dstOut[1] = rgba_src[1] * rgba_dstIn[1] * alpha + rgba_dstIn[1] * (1f - alpha);
rgba_dstOut[2] = rgba_src[2] * rgba_dstIn[2] * alpha + rgba_dstIn[2] * (1f - alpha);
break;
}
}
}
}
public void dispose() {
}
}
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