ImgReader (JPEG2000 support for Java Advanced Imaging Image I/O Tools API 1.2-pre-dr-b04-2014-09-13 API)

java.lang.Object
- jj2000.j2k.image.input.ImgReader

All Implemented Interfaces:

BlkImgDataSrc, ImgData

Direct Known Subclasses:

ImgReaderPGM
```
public abstract class ImgReader
extends Object
implements BlkImgDataSrc
```
This is the generic interface to be implemented by all image file (or other resource) readers for different image file formats.
An ImgReader behaves as an ImgData object. Whenever image data is requested through the getInternCompData() or getCompData() methods, the image data will be read (if it is not buffered) and returned. Implementing classes should not buffer large amounts of data, so as to reduce memory usage.

This class sets the image origin to (0,0). All default implementations of the methods assume this.

This class provides default implementations of many methods. These default implementations assume that there is no tiling (i.e., the only tile is the entire image), that the image origin is (0,0) in the canvas system and that there is no component subsampling (all components are the same size), but they can be overloaded by the implementating class if need be.

Field Summary

Fields
Modifier and Type Field and Description

protected int h
The height of the image

protected int nc
The number of components in the image

protected int w
The width of the image

Fields
Modifier and Type	Field and Description
`protected int`	`h` The height of the image
`protected int`	`nc` The number of components in the image
`protected int`	`w` The width of the image

Constructor Summary

Constructors
Constructor and Description

ImgReader()

Constructors
Constructor and Description
`ImgReader()`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`abstract void`	`close()` Closes the underlying file or network connection from where the image data is being read.
`int`	`getCompImgHeight(int c)` Returns the height in pixels of the specified component in the overall image.
`int`	`getCompImgWidth(int c)` 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`	`getImgHeight()` Returns the overall height of the image in pixels.
`int`	`getImgULX()` Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
`int`	`getImgULY()` Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
`int`	`getImgWidth()` Returns the overall width of the image in pixels.
`int`	`getNomTileHeight()` Returns the nominal tiles height
`int`	`getNomTileWidth()` Returns the nominal tiles width
`int`	`getNumComps()` Returns the number of components in the image.
`int`	`getNumTiles()` Returns the total number of tiles in the image.
`Point`	`getNumTiles(Point co)` Returns the number of tiles in the horizontal and vertical directions.
`Point`	`getTile(Point co)` 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`	`getTileHeight()` Returns the overall height of the current tile in pixels, assuming there is no-tiling.
`int`	`getTileIdx()` Returns the index of the current tile, relative to a standard scan-line order.
`int`	`getTilePartULX()` Returns the horizontal tile partition offset in the reference grid
`int`	`getTilePartULY()` Returns the vertical tile partition offset in the reference grid
`int`	`getTileWidth()` Returns the width of the current tile in pixels, assuming there is no-tiling.
`abstract boolean`	`isOrigSigned(int c)` Returns true if the data read was originally signed in the specified component, false if not.
`void`	`nextTile()` 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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface jj2000.j2k.image.BlkImgDataSrc
getCompData, getFixedPoint, getInternCompData

Methods inherited from interface jj2000.j2k.image.ImgData
getNomRangeBits

- Field Detail
  - w
```
protected int w
```
    The width of the image
  - h
```
protected int h
```
    The height of the image
  - nc
```
protected int nc
```
    The number of components in the image
- Constructor Detail
  - ImgReader
```
public ImgReader()
```
- Method Detail
  - close
```
public abstract void close()
                    throws IOException
```
    Closes the underlying file or network connection from where the image data is being read.
    
    Throws:
    
    IOException - If an I/O error occurs.
  - getTileWidth
```
public int getTileWidth()
```
    Returns the width of the current tile in pixels, assuming there is no-tiling. Since no-tiling is assumed this is the same as the width of the image. The value of w is returned.
    
    Specified by:
    
    getTileWidth in interface ImgData
    
    Returns:
    
    The total image width in pixels.
  - getTileHeight
```
public int getTileHeight()
```
    Returns the overall height of the current tile in pixels, assuming there is no-tiling. Since no-tiling is assumed this is the same as the width of the image. The value of h is returned.
    
    Specified by:
    
    getTileHeight in interface ImgData
    
    Returns:
    
    The total image 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. The value of w is returned.
    
    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. The value of h is returned.
    
    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. The value of nc is returned.
    
    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 C-1)
    
    Returns:
    
    The horizontal subsampling factor of component 'c'
    
    See Also:
    
    ImgData
  - 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 C-1)
    
    Returns:
    
    The vertical subsampling factor of component 'c'
    
    See Also:
    
    ImgData
  - getTileCompWidth
```
public int getTileCompWidth(int t,
                            int c)
```
    Returns the width in pixels of the specified tile-component. This default implementation assumes no tiling and no component subsampling (i.e., all components, or components, have the same dimensions in pixels).
    
    Specified by:
    
    getTileCompWidth in interface ImgData
    
    Parameters:
    
    t - Tile index
    
    c - The index of the component, from 0 to C-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. This default implementation assumes no tiling and no component subsampling (i.e., all components, or components, have the same dimensions in pixels).
    
    Specified by:
    
    getTileCompHeight in interface ImgData
    
    Parameters:
    
    t - The tile index
    
    c - The index of the component, from 0 to C-1.
    
    Returns:
    
    The height in pixels of component c in tile t.
  - getCompImgWidth
```
public int getCompImgWidth(int c)
```
    Returns the width in pixels of the specified component in the overall image. This default implementation assumes no component, or component, subsampling (i.e. all components have the same dimensions in pixels).
    
    Specified by:
    
    getCompImgWidth in interface ImgData
    
    Parameters:
    
    c - The index of the component, from 0 to C-1.
    
    Returns:
    
    The width in pixels of component c in the overall image.
  - getCompImgHeight
```
public int getCompImgHeight(int c)
```
    Returns the height in pixels of the specified component in the overall image. This default implementation assumes no component, or component, subsampling (i.e. all components have the same dimensions in pixels).
    
    Specified by:
    
    getCompImgHeight in interface ImgData
    
    Parameters:
    
    c - The index of the component, from 0 to C-1.
    
    Returns:
    
    The height in pixels of component c in the overall image.
  - 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. This default implementation assumes no tiling so the only valid arguments are x=0, y=0.
    
    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.
  - isOrigSigned
```
public abstract boolean isOrigSigned(int c)
```
    Returns true if the data read was originally signed in the specified component, false if not.
    
    Parameters:
    
    c - The index of the component, from 0 to C-1.
    
    Returns:
    
    true if the data was originally signed, false if not.

Class ImgReader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface jj2000.j2k.image.BlkImgDataSrc

Methods inherited from interface jj2000.j2k.image.ImgData

Field Detail

w

h

nc

Constructor Detail

ImgReader

Method Detail

close

getTileWidth

getTileHeight

getNomTileWidth

getNomTileHeight

getImgWidth

getImgHeight

getNumComps

getCompSubsX

getCompSubsY

getTileCompWidth

getTileCompHeight

getCompImgWidth

getCompImgHeight

setTile

nextTile

getTile

getTileIdx

getCompULX

getCompULY

getTilePartULX

getTilePartULY

getImgULX

getImgULY

getNumTiles

getNumTiles

isOrigSigned