Class ImgDataJoiner

java.lang.Object
jj2000.j2k.image.ImgDataJoiner
All Implemented Interfaces:
BlkImgDataSrc, ImgData

public class ImgDataJoiner extends Object implements BlkImgDataSrc
This class implements the ImgData interface and allows to obtain data from different sources. Here, one source is represented by an ImgData and a component index. The typical use of this class is when the encoder needs different components (Red, Green, Blue, alpha, ...) from different input files (i.e. from different ImgReader objects).

All input ImgData must not be tiled (i.e. must have only 1 tile) and the image origin must be the canvas origin. The different inputs can have different dimensions though (this will lead to different subsampling factors for each component).

The input ImgData and component index list must be defined when constructing this class and can not be modified later.

See Also:
  • Constructor Summary

    Constructors
    Constructor
    Description
    ImgDataJoiner(BlkImgDataSrc[] imD, int[] cIdx)
    Class constructor.
  • Method Summary

    Modifier and Type
    Method
    Description
    getCompData(DataBlk blk, int c)
    Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component.
    int
    Returns the height in pixels of the specified component in the overall image.
    int
    Returns the width in pixels of the specified component in the overall image.
    int
    getCompSubsX(int c)
    Returns the component subsampling factor in the horizontal direction, for the specified component.
    int
    getCompSubsY(int c)
    Returns the component subsampling factor in the vertical direction, for the specified component.
    int
    getCompULX(int c)
    Returns the horizontal coordinate of the upper-left corner of the specified component in the current tile.
    int
    getCompULY(int c)
    Returns the vertical coordinate of the upper-left corner of the specified component in the current tile.
    int
    Returns the position of the fixed point in the specified component.
    int
    Returns the overall height of the image in pixels.
    int
    Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
    int
    Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
    int
    Returns the overall width of the image in pixels.
    Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component.
    int
    Returns the number of bits, referred to as the "range bits", corresponding to the nominal range of the data in the specified component.
    int
    Returns the nominal tiles height
    int
    Returns the nominal tiles width
    int
    Returns the number of components in the image.
    int
    Returns the total number of tiles in the image.
    Returns the number of tiles in the horizontal and vertical directions.
    Returns the coordinates of the current tile.
    int
    getTileCompHeight(int t, int c)
    Returns the height in pixels of the specified tile-component.
    int
    getTileCompWidth(int t, int c)
    Returns the width in pixels of the specified tile-component
    int
    Returns the overall height of the current tile in pixels.
    int
    Returns the index of the current tile, relative to a standard scan-line order.
    int
    Returns the horizontal tile partition offset in the reference grid
    int
    Returns the vertical tile partition offset in the reference grid
    int
    Returns the overall width of the current tile in pixels.
    void
    Advances to the next tile, in standard scan-line order (by rows then columns).
    void
    setTile(int x, int y)
    Changes the current tile, given the new coordinates.
    Returns a string of information about the object, more than 1 line long.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
  • Constructor Details

    • ImgDataJoiner

      public ImgDataJoiner(BlkImgDataSrc[] imD, int[] cIdx)
      Class constructor. Each input BlkImgDataSrc and its component index must appear in the order wanted for the output components.
      Example: Reading R,G,B components from 3 PGM files.
      BlkImgDataSrc[] idList =
      {
      new ImgReaderPGM(new BEBufferedRandomAccessFile("R.pgm", "r")),
      new ImgReaderPGM(new BEBufferedRandomAccessFile("G.pgm", "r")),
      new ImgReaderPGM(new BEBufferedRandomAccessFile("B.pgm", "r"))
      };
      int[] compIdx = {0,0,0};
      ImgDataJoiner idj = new ImgDataJoiner(idList, compIdx);

      Of course, the 2 arrays must have the same length (This length is the number of output components). The image width and height are definded to be the maximum values of all the input ImgData.

      Parameters:
      imD - The list of input BlkImgDataSrc in an array.
      cIdx - The component index associated with each ImgData.
  • Method Details

    • getTileWidth

      public int getTileWidth()
      Returns the overall width of the current tile in pixels. This is the tile's width without accounting for any component subsampling.
      Specified by:
      getTileWidth in interface ImgData
      Returns:
      The total current tile's width in pixels.
    • getTileHeight

      public int getTileHeight()
      Returns the overall height of the current tile in pixels. This is the tile's height without accounting for any component subsampling.
      Specified by:
      getTileHeight in interface ImgData
      Returns:
      The total current tile's height in pixels.
    • getNomTileWidth

      public int getNomTileWidth()
      Returns the nominal tiles width
      Specified by:
      getNomTileWidth in interface ImgData
    • getNomTileHeight

      public int getNomTileHeight()
      Returns the nominal tiles height
      Specified by:
      getNomTileHeight in interface ImgData
    • getImgWidth

      public int getImgWidth()
      Returns the overall width of the image in pixels. This is the image's width without accounting for any component subsampling or tiling.
      Specified by:
      getImgWidth in interface ImgData
      Returns:
      The total image's width in pixels.
    • getImgHeight

      public int getImgHeight()
      Returns the overall height of the image in pixels. This is the image's height without accounting for any component subsampling or tiling.
      Specified by:
      getImgHeight in interface ImgData
      Returns:
      The total image's height in pixels.
    • getNumComps

      public int getNumComps()
      Returns the number of components in the image.
      Specified by:
      getNumComps in interface ImgData
      Returns:
      The number of components in the image.
    • getCompSubsX

      public int getCompSubsX(int c)
      Returns the component subsampling factor in the horizontal direction, for the specified component. This is, approximately, the ratio of dimensions between the reference grid and the component itself, see the 'ImgData' interface desription for details.
      Specified by:
      getCompSubsX in interface ImgData
      Parameters:
      c - The index of the component (between 0 and N-1)
      Returns:
      The horizontal subsampling factor of component 'c'
      See Also:
    • getCompSubsY

      public int getCompSubsY(int c)
      Returns the component subsampling factor in the vertical direction, for the specified component. This is, approximately, the ratio of dimensions between the reference grid and the component itself, see the 'ImgData' interface desription for details.
      Specified by:
      getCompSubsY in interface ImgData
      Parameters:
      c - The index of the component (between 0 and N-1)
      Returns:
      The vertical subsampling factor of component 'c'
      See Also:
    • getTileCompWidth

      public int getTileCompWidth(int t, int c)
      Returns the width in pixels of the specified tile-component
      Specified by:
      getTileCompWidth in interface ImgData
      Parameters:
      t - Tile index
      c - The index of the component, from 0 to N-1.
      Returns:
      The width in pixels of component c in tilet.
    • getTileCompHeight

      public int getTileCompHeight(int t, int c)
      Returns the height in pixels of the specified tile-component.
      Specified by:
      getTileCompHeight in interface ImgData
      Parameters:
      t - The tile index.
      c - The index of the component, from 0 to N-1.
      Returns:
      The height in pixels of component c in the current tile.
    • getCompImgWidth

      public int getCompImgWidth(int c)
      Returns the width in pixels of the specified component in the overall image.
      Specified by:
      getCompImgWidth in interface ImgData
      Parameters:
      c - The index of the component, from 0 to N-1.
      Returns:
      The width in pixels of component c in the overall image.
    • getCompImgHeight

      public int getCompImgHeight(int n)
      Returns the height in pixels of the specified component in the overall image.
      Specified by:
      getCompImgHeight in interface ImgData
      Parameters:
      n - The index of the component, from 0 to N-1.
      Returns:
      The height in pixels of component n in the overall image.
    • getNomRangeBits

      public int getNomRangeBits(int c)
      Returns the number of bits, referred to as the "range bits", corresponding to the nominal range of the data in the specified component. If this number is b then for unsigned data the nominal range is between 0 and 2^b-1, and for signed data it is between -2^(b-1) and 2^(b-1)-1. For floating point data this value is not applicable.
      Specified by:
      getNomRangeBits in interface ImgData
      Parameters:
      c - The index of the component.
      Returns:
      The number of bits corresponding to the nominal range of the data. Fro floating-point data this value is not applicable and the return value is undefined.
    • getFixedPoint

      public int getFixedPoint(int c)
      Returns the position of the fixed point in the specified component. This is the position of the least significant integral (i.e. non-fractional) bit, which is equivalent to the number of fractional bits. For instance, for fixed-point values with 2 fractional bits, 2 is returned. For floating-point data this value does not apply and 0 should be returned. Position 0 is the position of the least significant bit in the data.
      Specified by:
      getFixedPoint in interface BlkImgDataSrc
      Parameters:
      c - The index of the component.
      Returns:
      The position of the fixed-point, which is the same as the number of fractional bits. For floating-point data 0 is returned.
    • getInternCompData

      public DataBlk getInternCompData(DataBlk blk, int c)
      Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component. The data is returned, as a reference to the internal data, if any, instead of as a copy, therefore the returned data should not be modified.

      The rectangular area to return is specified by the 'ulx', 'uly', 'w' and 'h' members of the 'blk' argument, relative to the current tile. These members are not modified by this method. The 'offset' and 'scanw' of the returned data can be arbitrary. See the 'DataBlk' class.

      This method, in general, is more efficient than the 'getCompData()' method since it may not copy the data. However if the array of returned data is to be modified by the caller then the other method is probably preferable.

      If the data array in blk is null, then a new one is created if necessary. The implementation of this interface may choose to return the same array or a new one, depending on what is more efficient. Therefore, the data array in blk prior to the method call should not be considered to contain the returned data, a new array may have been created. Instead, get the array from blk after the method has returned.

      The returned data may have its 'progressive' attribute set. In this case the returned data is only an approximation of the "final" data.

      Specified by:
      getInternCompData in interface BlkImgDataSrc
      Parameters:
      blk - Its coordinates and dimensions specify the area to return, relative to the current tile. Some fields in this object are modified to return the data.
      c - The index of the component from which to get the data.
      Returns:
      The requested DataBlk
      See Also:
    • getCompData

      public DataBlk getCompData(DataBlk blk, int c)
      Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component. The data is returned, as a copy of the internal data, therefore the returned data can be modified "in place".

      The rectangular area to return is specified by the 'ulx', 'uly', 'w' and 'h' members of the 'blk' argument, relative to the current tile. These members are not modified by this method. The 'offset' of the returned data is 0, and the 'scanw' is the same as the block's width. See the 'DataBlk' class.

      This method, in general, is less efficient than the 'getInternCompData()' method since, in general, it copies the data. However if the array of returned data is to be modified by the caller then this method is preferable.

      If the data array in 'blk' is 'null', then a new one is created. If the data array is not 'null' then it is reused, and it must be large enough to contain the block's data. Otherwise an 'ArrayStoreException' or an 'IndexOutOfBoundsException' is thrown by the Java system.

      The returned data may have its 'progressive' attribute set. In this case the returned data is only an approximation of the "final" data.

      Specified by:
      getCompData in interface BlkImgDataSrc
      Parameters:
      blk - Its coordinates and dimensions specify the area to return, relative to the current tile. If it contains a non-null data array, then it must be large enough. If it contains a null data array a new one is created. Some fields in this object are modified to return the data.
      c - The index of the component from which to get the data.
      Returns:
      The requested DataBlk
      See Also:
    • setTile

      public void setTile(int x, int y)
      Changes the current tile, given the new coordinates. An IllegalArgumentException is thrown if the coordinates do not correspond to a valid tile.
      Specified by:
      setTile in interface ImgData
      Parameters:
      x - The horizontal coordinate of the tile.
      y - The vertical coordinate of the new tile.
    • nextTile

      public void nextTile()
      Advances to the next tile, in standard scan-line order (by rows then columns). A NoNextElementException is thrown if the current tile is the last one (i.e. there is no next tile). This default implementation assumes no tiling, so NoNextElementException() is always thrown.
      Specified by:
      nextTile in interface ImgData
    • getTile

      public Point getTile(Point co)
      Returns the coordinates of the current tile. This default implementation assumes no-tiling, so (0,0) is returned.
      Specified by:
      getTile in interface ImgData
      Parameters:
      co - If not null this object is used to return the information. If null a new one is created and returned.
      Returns:
      The current tile's coordinates.
    • getTileIdx

      public int getTileIdx()
      Returns the index of the current tile, relative to a standard scan-line order. This default implementations assumes no tiling, so 0 is always returned.
      Specified by:
      getTileIdx in interface ImgData
      Returns:
      The current tile's index (starts at 0).
    • getCompULX

      public int getCompULX(int c)
      Returns the horizontal coordinate of the upper-left corner of the specified component in the current tile.
      Specified by:
      getCompULX in interface ImgData
      Parameters:
      c - The component index.
    • getCompULY

      public int getCompULY(int c)
      Returns the vertical coordinate of the upper-left corner of the specified component in the current tile.
      Specified by:
      getCompULY in interface ImgData
      Parameters:
      c - The component index.
    • getTilePartULX

      public int getTilePartULX()
      Returns the horizontal tile partition offset in the reference grid
      Specified by:
      getTilePartULX in interface ImgData
    • getTilePartULY

      public int getTilePartULY()
      Returns the vertical tile partition offset in the reference grid
      Specified by:
      getTilePartULY in interface ImgData
    • getImgULX

      public int getImgULX()
      Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
      Specified by:
      getImgULX in interface ImgData
      Returns:
      The horizontal coordinate of the image origin in the canvas system, on the reference grid.
    • getImgULY

      public int getImgULY()
      Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
      Specified by:
      getImgULY in interface ImgData
      Returns:
      The vertical coordinate of the image origin in the canvas system, on the reference grid.
    • getNumTiles

      public Point getNumTiles(Point co)
      Returns the number of tiles in the horizontal and vertical directions. This default implementation assumes no tiling, so (1,1) is always returned.
      Specified by:
      getNumTiles in interface ImgData
      Parameters:
      co - If not null this object is used to return the information. If null a new one is created and returned.
      Returns:
      The number of tiles in the horizontal (Point.x) and vertical (Point.y) directions.
    • getNumTiles

      public int getNumTiles()
      Returns the total number of tiles in the image. This default implementation assumes no tiling, so 1 is always returned.
      Specified by:
      getNumTiles in interface ImgData
      Returns:
      The total number of tiles in the image.
    • toString

      public String toString()
      Returns a string of information about the object, more than 1 line long. The information string includes information from the several input ImgData (their toString() method are called one after the other).
      Overrides:
      toString in class Object
      Returns:
      A string of information about the object.