ImageFunctionRIF.java

/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
 *    http://www.geo-solutions.it/
 *    Copyright 2014 GeoSolutions


 * Licensed 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.
 */
package it.geosolutions.jaiext.imagefunction;

import it.geosolutions.jaiext.range.Range;

import java.awt.RenderingHints;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderedImageFactory;

import javax.media.jai.ImageFunction;
import javax.media.jai.ImageLayout;
import javax.media.jai.ROI;

import com.sun.media.jai.opimage.RIFUtil;

/**
 * {@link RenderedImageFactory} implementation generating a {@link ImageFunctionOpImage} instance.
 * 
 * @author Nicola Lagomarsini GeoSolutions
 * 
 */
public class ImageFunctionRIF implements RenderedImageFactory {

    /** Constructor. */
    public ImageFunctionRIF() {
    }

    /**
     * Creates a new instance of ImageFunctionOpImage in the rendered layer. This method satisfies the implementation of RIF.
     * 
     * @param paramBlock The source image, the X and Y scale factor, and the interpolation method for resampling.
     */
    public RenderedImage create(ParameterBlock paramBlock, RenderingHints renderHints) {
        // Get ImageLayout from renderHints if any.
        ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);

        ImageFunction function = (ImageFunction) paramBlock.getObjectParameter(0);

        // Ascertain that a supplied SampleModel has the requisite
        // number of bands vis-a-vis the ImageFunction.
        int numBandsRequired = function.isComplex() ? function.getNumElements() * 2 : function
                .getNumElements();
        if (layout != null && layout.isValid(ImageLayout.SAMPLE_MODEL_MASK)
                && layout.getSampleModel(null).getNumBands() != numBandsRequired) {
            throw new RuntimeException(JaiI18N.getString("ImageFunctionRIF0"));
        }
        // Origin definition
        int minX = 0;
        int minY = 0;
        if (layout != null) {
            if (layout.isValid(ImageLayout.MIN_X_MASK)) {
                minX = layout.getMinX(null);
            }
            if (layout.isValid(ImageLayout.MIN_Y_MASK)) {
                minY = layout.getMinX(null);
            }
        }

        int width = paramBlock.getIntParameter(1);
        int height = paramBlock.getIntParameter(2);
        float xScale = paramBlock.getFloatParameter(3);
        float yScale = paramBlock.getFloatParameter(4);
        float xTrans = paramBlock.getFloatParameter(5);
        float yTrans = paramBlock.getFloatParameter(6);
        // Setting ROI and NoData
        ROI roi = (ROI) paramBlock.getObjectParameter(7);
        Range nodata = (Range) paramBlock.getObjectParameter(8);
        float destNoData = paramBlock.getFloatParameter(9);

        return new ImageFunctionOpImage(function, minX, minY, width, height, xScale, yScale,
                xTrans, yTrans, roi, nodata, destNoData, renderHints, layout);
    }

}