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

 public  void imageProgress(ImageWriter source,
    float percentageDone)
Reports the approximate degree of completion of the current
write call within the associated
ImageWriter.

 The degree of completion is expressed as an index
indicating which image is being written, and a percentage
varying from 0.0F to 100.0F
indicating how much of the current image has been output.  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 ImageWriter 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(ImageWriter source,
    int imageIndex)
Reports that an image write operation is beginning.  All
ImageWriter implementations are required to call
this method exactly once when beginning an image write
operation.

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

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

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

 public  void writeAborted(ImageWriter source)
Reports that a write has been aborted via the writer's
abort method.  No further notifications will be
given.