/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.render.afp;

import java.awt.image.RenderedImage;
import java.io.IOException;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.fop.afp.AFPDataObjectInfo;
import org.apache.fop.afp.AFPImageObjectInfo;
import org.apache.fop.afp.AFPObjectAreaInfo;
import org.apache.fop.afp.AFPPaintingState;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.impl.ImageRendered;
import org.apache.xmlgraphics.ps.ImageEncodingHelper;
import org.apache.xmlgraphics.util.MimeConstants;

/**
 * PDFImageHandler implementation which handles RenderedImage instances.
 */
public class AFPImageHandlerRenderedImage extends AFPImageHandler {

    private static final ImageFlavor[] FLAVORS = new ImageFlavor[] {
        ImageFlavor.BUFFERED_IMAGE,
        ImageFlavor.RENDERED_IMAGE
    };

    /** {@inheritDoc} */
    public AFPDataObjectInfo generateDataObjectInfo(
            AFPRendererImageInfo rendererImageInfo) throws IOException {
        AFPImageObjectInfo imageObjectInfo
            = (AFPImageObjectInfo)super.generateDataObjectInfo(rendererImageInfo);

        AFPRendererContext rendererContext
            = (AFPRendererContext)rendererImageInfo.getRendererContext();
        AFPInfo afpInfo = rendererContext.getInfo();
        AFPPaintingState paintingState = afpInfo.getPaintingState();
        int resolution = paintingState.getResolution();

        imageObjectInfo.setMimeType(MimeConstants.MIME_AFP_IOCA_FS45);
        imageObjectInfo.setDataHeightRes(resolution);
        imageObjectInfo.setDataWidthRes(resolution);

        ImageRendered imageRendered = (ImageRendered) rendererImageInfo.img;
        RenderedImage renderedImage = imageRendered.getRenderedImage();

        int dataHeight = renderedImage.getHeight();
        imageObjectInfo.setDataHeight(dataHeight);

        int dataWidth = renderedImage.getWidth();
        imageObjectInfo.setDataWidth(dataWidth);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageEncodingHelper.encodeRenderedImageAsRGB(renderedImage, baos);
        byte[] imageData = baos.toByteArray();

        boolean colorImages = paintingState.isColorImages();
        imageObjectInfo.setColor(colorImages);

        // convert to grayscale
        if (!colorImages) {
            baos.reset();
            int bitsPerPixel = paintingState.getBitsPerPixel();
            imageObjectInfo.setBitsPerPixel(bitsPerPixel);
            ImageEncodingHelper.encodeRGBAsGrayScale(
                  imageData, dataWidth, dataHeight, bitsPerPixel, baos);
            imageData = baos.toByteArray();
        }
        imageObjectInfo.setData(imageData);

        // set object area info
        AFPObjectAreaInfo objectAreaInfo = imageObjectInfo.getObjectAreaInfo();
        objectAreaInfo.setWidthRes(resolution);
        objectAreaInfo.setHeightRes(resolution);

        return imageObjectInfo;
    }

    /** {@inheritDoc} */
    protected AFPDataObjectInfo createDataObjectInfo() {
        return new AFPImageObjectInfo();
    }

    /** {@inheritDoc} */
    public int getPriority() {
        return 300;
    }

    /** {@inheritDoc} */
    public Class getSupportedImageClass() {
        return ImageRendered.class;
    }

    /** {@inheritDoc} */
    public ImageFlavor[] getSupportedImageFlavors() {
        return FLAVORS;
    }

}