Example usage for javax.imageio ImageReadParam getDestinationOffset

Introduction

In this page you can find the example usage for javax.imageio ImageReadParam getDestinationOffset.

Prototype

public Point getDestinationOffset() 

Source Link

Document

Returns the offset in the destination image at which pixels are to be placed.

Usage

From source file:nitf.imageio.NITFReader.java

@Override
public Raster readRaster(int imageIndex, ImageReadParam param) throws IOException {
    checkIndex(imageIndex);// w w  w.  j av  a 2s . c om

    Rectangle sourceRegion = new Rectangle();
    Rectangle destRegion = new Rectangle();
    computeRegions(param, getWidth(imageIndex), getHeight(imageIndex), null, sourceRegion, destRegion);

    // Set everything to default values
    int sourceXSubsampling = param != null ? param.getSourceXSubsampling() : 1;
    int sourceYSubsampling = param != null ? param.getSourceYSubsampling() : 1;
    Point destinationOffset = param != null ? param.getDestinationOffset() : new Point(0, 0);

    ImageSubheader subheader;
    try {
        subheader = record.getImages()[imageIndex].getSubheader();
    } catch (NITFException e) {
        throw new IOException(ExceptionUtils.getStackTrace(e));
    }
    String irep = subheader.getImageRepresentation().getStringData().trim();
    String pvType = subheader.getPixelValueType().getStringData().trim();
    int nbpp = subheader.getNumBitsPerPixel().getIntData();
    int bandCount = subheader.getBandCount();

    // make the band offsets array, for the output
    int[] bandOffsets = null;
    int[] sourceBands = param != null ? param.getSourceBands() : null;
    if (param != null && param.getDestinationBands() != null)
        bandOffsets = param.getDestinationBands();
    else if (param != null && sourceBands != null) {
        bandOffsets = new int[sourceBands.length];
        for (int i = 0; i < bandOffsets.length; i++)
            bandOffsets[i] = sourceBands[i];
    } else {
        // Setup band offsets -- TODO should we really read ALL bands by
        // default?
        bandOffsets = new int[bandCount];
        for (int i = 0; i < bandOffsets.length; i++)
            bandOffsets[i] = i;
    }

    int nBytes = ((nbpp - 1) / 8) + 1;

    int bufType = -1;

    // byte
    if (nBytes == 1) {
        bufType = DataBuffer.TYPE_BYTE;
    }
    // short
    else if (nBytes == 2) {
        bufType = DataBuffer.TYPE_USHORT;
    }
    // float
    else if (nBytes == 4 && pvType.equals("R")) {
        bufType = DataBuffer.TYPE_FLOAT;
    }
    // double
    else if (nBytes == 8 && pvType.equals("R")) {
        bufType = DataBuffer.TYPE_DOUBLE;
    } else {
        throw new NotImplementedException("not yet implemented");
    }

    WritableRaster ras = ImageIOUtils.makeGenericPixelInterleavedWritableRaster(destRegion.width,
            destRegion.height, bandOffsets.length, bufType);
    checkReadParamBandSettings(param, bandCount, ras.getSampleModel().getNumBands());
    readRaster(imageIndex, sourceRegion, destRegion, sourceXSubsampling, sourceYSubsampling, bandOffsets,
            nBytes, destinationOffset, ras);
    return ras;
}

---