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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2008, 2013, 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
 * or visit www.oracle.com if you need additional information or have any
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 */

package com.sun.scenario.effect.impl.prism;

import com.sun.scenario.effect.Effect;
import com.sun.scenario.effect.FilterContext;
import com.sun.scenario.effect.ImageData;
import com.sun.scenario.effect.Merge;
import com.sun.scenario.effect.impl.EffectPeer;
import com.sun.scenario.effect.impl.Renderer;
import com.sun.javafx.geom.Rectangle;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.prism.Graphics;

public class PrMergePeer extends EffectPeer {

    public PrMergePeer(FilterContext fctx, Renderer r, String uniqueName) {
        super(fctx, r, uniqueName);
    }

    @Override
    public ImageData filter(Effect effect,
                            BaseTransform transform,
                            Rectangle outputClip,
                            ImageData... inputs)
    {
        FilterContext fctx = getFilterContext();
        Merge merge = (Merge)effect;

        Rectangle unionbounds = merge.getResultBounds(transform, outputClip, inputs);
        PrDrawable dst = (PrDrawable)getRenderer().
            getCompatibleImage(unionbounds.width, unionbounds.height);
        if (dst == null) {
            return new ImageData(fctx, null, unionbounds);
        }

        Graphics gdst = dst.createGraphics();
        for (ImageData input : inputs) {
            PrEffectHelper.renderImageData(gdst, input, unionbounds);
        }

        return new ImageData(fctx, dst, unionbounds);
    }
}