Class TIFFBaseJPEGCompressor

java.lang.Object
com.github.jaiimageio.plugins.tiff.TIFFCompressor
com.github.jaiimageio.impl.plugins.tiff.TIFFBaseJPEGCompressor
Direct Known Subclasses:
TIFFEXIFJPEGCompressor, TIFFJPEGCompressor

public abstract class TIFFBaseJPEGCompressor extends TIFFCompressor
Base class for all possible forms of JPEG compression in TIFF.
  • Field Details

  • Constructor Details

    • TIFFBaseJPEGCompressor

      public TIFFBaseJPEGCompressor(String compressionType, int compressionTagValue, boolean isCompressionLossless, ImageWriteParam param)
  • Method Details

    • pruneNodes

      private static void pruneNodes(Node tree, boolean pruneTables)
      Removes nonessential nodes from a JPEG native image metadata tree. All nodes derived from JPEG marker segments other than DHT, DQT, SOF, SOS segments are removed unless pruneTables is true in which case the nodes derived from the DHT and DQT marker segments are also removed.
      Parameters:
      tree - A javax_imageio_jpeg_image_1.0 tree.
      pruneTables - Whether to prune Huffman and quantization tables.
      Throws:
      IllegalArgumentException - if tree is null or is not the root of a JPEG native image metadata tree.
    • getAllNodes

      private static List getAllNodes(IIOMetadataNode root, List nodes)
    • initJPEGWriter

      protected void initJPEGWriter(boolean supportsStreamMetadata, boolean supportsImageMetadata)
      Initializes the JPEGWriter and JPEGParam instance variables. This method must be called before encode() is invoked.
      Parameters:
      supportsStreamMetadata - Whether the JPEG writer must support JPEG native stream metadata, i.e., be capable of writing abbreviated streams.
      supportsImageMetadata - Whether the JPEG writer must support JPEG native image metadata.
    • getImageMetadata

      private IIOMetadata getImageMetadata(boolean pruneTables) throws IIOException
      Retrieves image metadata with non-core nodes removed.
      Throws:
      IIOException
    • encode

      public final int encode(byte[] b, int off, int width, int height, int[] bitsPerSample, int scanlineStride) throws IOException
      Description copied from class: TIFFCompressor
      Encodes the supplied image data, writing to the currently set ImageOutputStream.
      Specified by:
      encode in class TIFFCompressor
      Parameters:
      b - an array of bytes containing the packed but uncompressed image data.
      off - the starting offset of the data to be written in the array b.
      width - the width of the rectangle of pixels to be written.
      height - the height of the rectangle of pixels to be written.
      bitsPerSample - an array of ints indicting the number of bits used to represent each image sample within a pixel.
      scanlineStride - the number of bytes separating each row of the input data.
      Returns:
      the number of bytes written.
      Throws:
      IOException - if the supplied data cannot be encoded by this TIFFCompressor, or if any I/O error occurs during writing.
    • finalize

      protected void finalize() throws Throwable
      Overrides:
      finalize in class Object
      Throws:
      Throwable