public  void imageComplete(ImageReader source)
Reports that the current image read operation has completed.
All ImageReader implementations are required to
call this method exactly once upon completion of each image
read operation.

 public  void imageProgress(ImageReader source,
    float percentageDone)
Reports the approximate degree of completion of the current
read call of the associated
ImageReader.

 The degree of completion is expressed as a percentage
varying from 0.0F to 100.0F.  The
percentage should ideally be calculated in terms of the
remaining time to completion, but it is usually more practical
to use a more well-defined metric such as pixels decoded or
portion of input stream consumed.  In any case, a sequence of
calls to this method during a given read operation should
supply a monotonically increasing sequence of percentage
values.  It is not necessary to supply the exact values
0 and 100, as these may be inferred
by the callee from other methods.

 Each particular ImageReader implementation may
call this method at whatever frequency it desires.  A rule of
thumb is to call it around each 5 percent mark.

 public  void imageStarted(ImageReader source,
    int imageIndex)
Reports that an image read operation is beginning.  All
ImageReader implementations are required to call
this method exactly once when beginning an image read
operation.

 public  void readAborted(ImageReader source)
Reports that a read has been aborted via the reader's
abort method.  No further notifications will be
given.

 public  void sequenceComplete(ImageReader source)
Reports that a sequence of read operationshas completed.
ImageReader implementations are required to call
this method exactly once from their
readAll(Iterator) method.

 public  void sequenceStarted(ImageReader source,
    int minIndex)
Reports that a sequence of read operations is beginning.
ImageReader implementations are required to call
this method exactly once from their
readAll(Iterator) method.

 public  void thumbnailComplete(ImageReader source)
Reports that a thumbnail read operation has completed.  All
ImageReader implementations are required to call
this method exactly once upon completion of each thumbnail read
operation.

 public  void thumbnailProgress(ImageReader source,
    float percentageDone)
Reports the approximate degree of completion of the current
getThumbnail call within the associated
ImageReader.  The semantics are identical to those
of imageProgress.

 public  void thumbnailStarted(ImageReader source,
    int imageIndex,
    int thumbnailIndex)
Reports that a thumbnail read operation is beginning.  All
ImageReader implementations are required to call
this method exactly once when beginning a thumbnail read
operation.