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java.lang.Objectucar.jpeg.jj2000.j2k.image.output.ImgWriter
ucar.jpeg.jj2000.j2k.image.output.ImgWriterPGM
public class ImgWriterPGM
This class writes a component from an image in 8 bit unsigned data to a binary PGM file. The size of the image that is written to the file is the size of the component from which to get the data, not the size of the source image (they differ if there is some sub-sampling).
Before writing, all coefficients are inversly level shifted and then
"saturated" (they are limited to the nominal dynamic range).
Ex:
if the nominal range is 0-255, the following algorithm is applied:
if coeff<0, output=0
if coeff>255, output=255
else
output=coeff
The write() methods of an object of this class may not be called concurrently from different threads.
NOTE: This class is not thread safe, for reasons of internal buffering.
Field Summary |
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Fields inherited from class ucar.jpeg.jj2000.j2k.image.output.ImgWriter |
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DEF_STRIP_HEIGHT, h, src, w |
Constructor Summary | |
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ImgWriterPGM(File out,
BlkImgDataSrc imgSrc,
int c)
Creates a new writer to the specified File object, to write data from the specified component. |
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ImgWriterPGM(String fname,
BlkImgDataSrc imgSrc,
int c)
Creates a new writer to the specified file, to write data from the specified component. |
Method Summary | |
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void |
close()
Closes the underlying file or netwrok connection to where the data is written. |
void |
flush()
Writes all buffered data to the file or resource. |
String |
toString()
Returns a string of information about the object, more than 1 line long. |
void |
write()
Writes the source's current tile to the output. |
void |
write(int ulx,
int uly,
int w,
int h)
Writes the data of the specified area to the file, coordinates are relative to the current tile of the source. |
Methods inherited from class ucar.jpeg.jj2000.j2k.image.output.ImgWriter |
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finalize, writeAll |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ImgWriterPGM(File out, BlkImgDataSrc imgSrc, int c) throws IOException
The size of the image that is written to the file is the size of the component from which to get the data, specified by b, not the size of the source image (they differ if there is some sub-sampling).
out
- The file where to write the dataimgSrc
- The source from where to get the image data to write.c
- The index of the component from where to get the data.
IOException
public ImgWriterPGM(String fname, BlkImgDataSrc imgSrc, int c) throws IOException
The size of the image that is written to the file is the size of the component from which to get the data, specified by b, not the size of the source image (they differ if there is some sub-sampling).
fname
- The name of the file where to write the dataimgSrc
- The source from where to get the image data to write.c
- The index of the component from where to get the data.
IOException
Method Detail |
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public void close() throws IOException
close
in class ImgWriter
IOException
- If an I/O error occurs.public void flush() throws IOException
flush
in class ImgWriter
IOException
- If an I/O error occurs.public void write(int ulx, int uly, int w, int h) throws IOException
This method may not be called concurrently from different threads.
If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.
write
in class ImgWriter
ulx
- The horizontal coordinate of the upper-left corner of the
area to write, relative to the current tile.uly
- The vertical coordinate of the upper-left corner of the area
to write, relative to the current tile.width
- The width of the area to write.height
- The height of the area to write.
IOException
- If an I/O error occurs.public void write() throws IOException
If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.
write
in class ImgWriter
IOException
- If an I/O error occurs.DataBlk
public String toString()
toString
in class Object
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