nom.tam.image.compression.tile.mask.NullPixelMaskPreserver Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of nom-tam-fits Show documentation
Java library for reading and writing FITS files. FITS, the Flexible Image Transport System, is the format commonly used in the archiving and transport of astronomical data.
There is a newer version: 1.20.2
Show newest version
package nom.tam.image.compression.tile.mask;

/*
 * #%L
 * nom.tam FITS library
 * %%
 * Copyright (C) 1996 - 2016 nom-tam-fits
 * %%
 * This is free and unencumbered software released into the public domain.
 * 
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 * 
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 * #L%
 */

import java.nio.ByteBuffer;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.LongBuffer;
import java.nio.ShortBuffer;

import nom.tam.fits.compression.algorithm.api.ICompressorControl;
import nom.tam.image.tile.operation.buffer.TileBuffer;
import nom.tam.util.type.PrimitiveTypes;

/**
 * This class overwrites the pixels specified in the mask with null values.
 * Where the null value can be defined separately.
 */
public class NullPixelMaskPreserver extends AbstractNullPixelMask {

    public NullPixelMaskPreserver(TileBuffer tileBuffer, int tileIndex, long nullValue, ICompressorControl compressorControl) {
        super(tileBuffer, tileIndex, nullValue, compressorControl);
    }

    public void preserveNull() {
        if (getTileBuffer().getBaseType().is(PrimitiveTypes.DOUBLE)) {
            preserveNullDoubles();
        } else if (getTileBuffer().getBaseType().is(PrimitiveTypes.FLOAT)) {
            preserveNullFloats();
        } else if (getTileBuffer().getBaseType().is(PrimitiveTypes.LONG)) {
            preserveNullLongs();
        } else if (getTileBuffer().getBaseType().is(PrimitiveTypes.INT)) {
            preserveNullInts();
        } else if (getTileBuffer().getBaseType().is(PrimitiveTypes.SHORT)) {
            preserveNullShorts();
        } else if (getTileBuffer().getBaseType().is(PrimitiveTypes.BYTE)) {
            preserveNullBytes();
        }
        if (getMask() != null) {
            ByteBuffer compressed = ByteBuffer.allocate(getTileBuffer().getPixelSize());
            if (!getCompressorControl().compress(getMask(), compressed, getCompressorControl().option())) {
                throw new IllegalStateException("could not compress the null pixel mask");
            }
            setMask(compressed);
        }
    }

    private void preserveNullBytes() {
        ByteBuffer buffer = (ByteBuffer) getTileBuffer().getBuffer();
        byte nullValue = (byte) getNullValue();
        int size = buffer.remaining();
        for (int index = 0; index < size; index++) {
            if (nullValue == buffer.get(index)) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

    private void preserveNullDoubles() {
        DoubleBuffer buffer = (DoubleBuffer) getTileBuffer().getBuffer();
        int size = getTileBuffer().getPixelSize();
        for (int index = 0; index < size; index++) {
            if (Double.isNaN(buffer.get(index))) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

    private void preserveNullFloats() {
        FloatBuffer buffer = (FloatBuffer) getTileBuffer().getBuffer();
        int size = getTileBuffer().getPixelSize();
        for (int index = 0; index < size; index++) {
            if (Float.isNaN(buffer.get(index))) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

    private void preserveNullInts() {
        IntBuffer buffer = (IntBuffer) getTileBuffer().getBuffer();
        int nullValue = (int) getNullValue();
        int size = getTileBuffer().getPixelSize();
        for (int index = 0; index < size; index++) {
            if (nullValue == buffer.get(index)) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

    private void preserveNullLongs() {
        LongBuffer buffer = (LongBuffer) getTileBuffer().getBuffer();
        long nullValue = getNullValue();
        int size = getTileBuffer().getPixelSize();
        for (int index = 0; index < size; index++) {
            if (nullValue == buffer.get(index)) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

    private void preserveNullShorts() {
        ShortBuffer buffer = (ShortBuffer) getTileBuffer().getBuffer();
        short nullValue = (short) getNullValue();
        int size = getTileBuffer().getPixelSize();
        for (int index = 0; index < size; index++) {
            if (nullValue == buffer.get(index)) {
                initializedMask(size).put(index, NULL_INDICATOR);
            }
        }
    }

}