/*
 * Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package sun.java2d;

import java.awt.Composite;
import java.awt.CompositeContext;
import java.awt.AlphaComposite;
import java.awt.image.ColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import sun.awt.image.BufImgSurfaceData;
import sun.java2d.loops.XORComposite;
import sun.java2d.loops.CompositeType;
import sun.java2d.loops.Blit;

public class SunCompositeContext implements CompositeContext {
    ColorModel srcCM;
    ColorModel dstCM;
    Composite composite;
    CompositeType comptype;

    public SunCompositeContext(AlphaComposite ac,
                               ColorModel s, ColorModel d)
    {
        if (s == null) {
            throw new NullPointerException("Source color model cannot be null");
        }
        if (d == null) {
            throw new NullPointerException("Destination color model cannot be null");
        }
        srcCM = s;
        dstCM = d;
        this.composite = ac;
        this.comptype = CompositeType.forAlphaComposite(ac);
    }

    public SunCompositeContext(XORComposite xc,
                               ColorModel s, ColorModel d)
    {
        if (s == null) {
            throw new NullPointerException("Source color model cannot be null");
        }
        if (d == null) {
            throw new NullPointerException("Destination color model cannot be null");
        }
        srcCM = s;
        dstCM = d;
        this.composite = xc;
        this.comptype = CompositeType.Xor;
    }

    
Release resources allocated for context.
/**
     * Release resources allocated for context.
     */
    public void dispose() {
    }

    
This method composes the two source tiles
and places the result in the destination tile. Note that
the destination can be the same object as either
the first or second source.
Params:
src1 – The first source tile for the compositing operation.
src2 – The second source tile for the compositing operation.
dst – The tile where the result of the operation is stored./**
     * This method composes the two source tiles
     * and places the result in the destination tile. Note that
     * the destination can be the same object as either
     * the first or second source.
     * @param src1 The first source tile for the compositing operation.
     * @param src2 The second source tile for the compositing operation.
     * @param dst The tile where the result of the operation is stored.
     */
    public void compose(Raster src1, Raster src2, WritableRaster dst) {
        WritableRaster src;
        int w;
        int h;

        if (src2 != dst) {
            dst.setDataElements(0, 0, src2);
        }

        // REMIND: We should be able to create a SurfaceData from just
        // a non-writable Raster and a ColorModel.  Since we need to
        // create a SurfaceData from a BufferedImage then we need to
        // make a WritableRaster since it is needed to construct a
        // BufferedImage.
        if (src1 instanceof WritableRaster) {
            src = (WritableRaster) src1;
        } else {
            src = src1.createCompatibleWritableRaster();
            src.setDataElements(0, 0, src1);
        }

        w = Math.min(src.getWidth(), src2.getWidth());
        h = Math.min(src.getHeight(), src2.getHeight());

        BufferedImage srcImg = new BufferedImage(srcCM, src,
                                                 srcCM.isAlphaPremultiplied(),
                                                 null);
        BufferedImage dstImg = new BufferedImage(dstCM, dst,
                                                 dstCM.isAlphaPremultiplied(),
                                                 null);

        SurfaceData srcData = BufImgSurfaceData.createData(srcImg);
        SurfaceData dstData = BufImgSurfaceData.createData(dstImg);
        Blit blit = Blit.getFromCache(srcData.getSurfaceType(),
                                      comptype,
                                      dstData.getSurfaceType());
        blit.Blit(srcData, dstData, composite, null, 0, 0, 0, 0, w, h);
    }
}