Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Std. Ed. v1.4.1
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.awt.image
Class BufferedImage

    java.lang.Object
      |
      +--java.awt.Image
            |
            +--java.awt.image.BufferedImage

All Implemented Interfaces:
  RenderedImage, WritableRenderedImage

public class BufferedImage
extends Image
implements WritableRenderedImage

The `BufferedImage` subclass describes an `Image` with an accessible buffer of image data. A `BufferedImage` is comprised of a `ColorModel` and a `Raster` of image data. The number and types of bands in the `SampleModel` of the `Raster` must match the number and types required by the `ColorModel` to represent its color and alpha components. All `BufferedImage` objects have an upper left corner coordinate of (0, 0). Any `Raster` used to construct a `BufferedImage` must therefore have minX=0 and minY=0.

See Also:
  `ColorModel`, `Raster`, `WritableRaster`

Field Summary
`static int` | `TYPE_3BYTE_BGR` Represents an image with 8-bit RGB color components, corresponding to a Windows-style BGR color model) with the colors Blue, Green, and Red stored in 3 bytes.
`static int` | `TYPE_4BYTE_ABGR` Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha.
`static int` | `TYPE_4BYTE_ABGR_PRE` Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha.
`static int` | `TYPE_BYTE_BINARY` Represents an opaque byte-packed 1, 2, or 4 bit image.
`static int` | `TYPE_BYTE_GRAY` Represents a unsigned byte grayscale image, non-indexed.
`static int` | `TYPE_BYTE_INDEXED` Represents an indexed byte image.
`static int` | `TYPE_CUSTOM` Image type is not recognized so it must be a customized image.
`static int` | `TYPE_INT_ARGB` Represents an image with 8-bit RGBA color components packed into integer pixels.
`static int` | `TYPE_INT_ARGB_PRE` Represents an image with 8-bit RGBA color components packed into integer pixels.
`static int` | `TYPE_INT_BGR` Represents an image with 8-bit RGB color components, corresponding to a Windows- or Solaris- style BGR color model, with the colors Blue, Green, and Red packed into integer pixels.
`static int` | `TYPE_INT_RGB` Represents an image with 8-bit RGB color components packed into integer pixels.
`static int` | `TYPE_USHORT_555_RGB` Represents an image with 5-5-5 RGB color components (5-bits red, 5-bits green, 5-bits blue) with no alpha.
`static int` | `TYPE_USHORT_565_RGB` Represents an image with 5-6-5 RGB color components (5-bits red, 6-bits green, 5-bits blue) with no alpha.
`static int` | `TYPE_USHORT_GRAY` Represents an unsigned short grayscale image, non-indexed).

Fields inherited from class java.awt.Image
`SCALE_AREA_AVERAGING, SCALE_DEFAULT, SCALE_FAST, SCALE_REPLICATE, SCALE_SMOOTH, UndefinedProperty`

Constructor Summary
`BufferedImage(ColorModel cm, WritableRaster raster, boolean isRasterPremultiplied, Hashtable properties)` Constructs a new `BufferedImage` with a specified `ColorModel` and `Raster`.
`BufferedImage(int width, int height, int imageType)` Constructs a `BufferedImage` of one of the predefined image types.
`BufferedImage(int width, int height, int imageType, IndexColorModel cm)` Constructs a `BufferedImage` of one of the predefined image types: TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED.

Method Summary
`void` | `addTileObserver(TileObserver to)` Adds a tile observer.
`void` | `coerceData(boolean isAlphaPremultiplied)` Forces the data to match the state specified in the `isAlphaPremultiplied` variable.
`WritableRaster` | `copyData(WritableRaster outRaster)` Computes an arbitrary rectangular region of the `BufferedImage` and copies it into a specified `WritableRaster`.
`Graphics2D` | `createGraphics()` Creates a `Graphics2D`, which can be used to draw into this `BufferedImage`.
`void` | `flush()` Flushes all resources being used to cache optimization information.
`WritableRaster` | `getAlphaRaster()` Returns a `WritableRaster` representing the alpha channel for `BufferedImage` objects with `ColorModel` objects that support a separate spatial alpha channel, such as `ComponentColorModel` and `DirectColorModel`.
`ColorModel` | `getColorModel()` Returns the `ColorModel`.
`Raster` | `getData()` Returns the image as one large tile.
`Raster` | `getData(Rectangle rect)` Computes and returns an arbitrary region of the `BufferedImage`.
`Graphics` | `getGraphics()` This method returns a `Graphics2D`, but is here for backwards compatibility.
`int` | `getHeight()` Returns the height of the `BufferedImage`.
`int` | `getHeight(ImageObserver observer)` Returns the height of the `BufferedImage`.
`int` | `getMinTileX()` Returns the minimum tile index in the x direction.
`int` | `getMinTileY()` Returns the minimum tile index in the y direction.
`int` | `getMinX()` Returns the minimum x coordinate of this `BufferedImage`.
`int` | `getMinY()` Returns the minimum y coordinate of this `BufferedImage`.
`int` | `getNumXTiles()` Returns the number of tiles in the x direction.
`int` | `getNumYTiles()` Returns the number of tiles in the y direction.
`Object` | `getProperty(String name)` Returns a property of the image by name.
`Object` | `getProperty(String name, ImageObserver observer)` Returns a property of the image by name.
`String[]` | `getPropertyNames()` Returns an array of names recognized by `getProperty(String)` or `null`, if no property names are recognized.
`WritableRaster` | `getRaster()` Returns the `WritableRaster`.
`int` | `getRGB(int x, int y)` Returns an integer pixel in the default RGB color model (TYPE_INT_ARGB) and default sRGB colorspace.
`int[]` | `getRGB(int startX, int startY, int w, int h, int[] rgbArray, int offset, int scansize)` Returns an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, from a portion of the image data.
`SampleModel` | `getSampleModel()` Returns the `SampleModel` associated with this `BufferedImage`.
`ImageProducer` | `getSource()` Returns the object that produces the pixels for the image.
`Vector` | `getSources()` Returns a `Vector` of `RenderedImage` objects that are the immediate sources, not the sources of these immediate sources, of image data for this `BufferedImage`.
`BufferedImage` | `getSubimage(int x, int y, int w, int h)` Returns a subimage defined by a specified rectangular region.
`Raster` | `getTile(int tileX, int tileY)` Returns tile (`tileX`, `tileY`).
`int` | `getTileGridXOffset()` Returns the x offset of the tile grid relative to the origin, For example, the x coordinate of the location of tile (0, 0).
`int` | `getTileGridYOffset()` Returns the y offset of the tile grid relative to the origin, For example, the y coordinate of the location of tile (0, 0).
`int` | `getTileHeight()` Returns the tile height in pixels.
`int` | `getTileWidth()` Returns the tile width in pixels.
`int` | `getType()` Returns the image type.
`int` | `getWidth()` Returns the width of the `BufferedImage`.
`int` | `getWidth(ImageObserver observer)` Returns the width of the `BufferedImage`.
`WritableRaster` | `getWritableTile(int tileX, int tileY)` Checks out a tile for writing.
`Point[]` | `getWritableTileIndices()` Returns an array of `Point` objects indicating which tiles are checked out for writing.
`boolean` | `hasTileWriters()` Returns whether or not any tile is checked out for writing.
`boolean` | `isAlphaPremultiplied()` Returns whether or not the alpha has been premultiplied.
`boolean` | `isTileWritable(int tileX, int tileY)` Returns whether or not a tile is currently checked out for writing.
`void` | `releaseWritableTile(int tileX, int tileY)` Relinquishes permission to write to a tile.
`void` | `removeTileObserver(TileObserver to)` Removes a tile observer.
`void` | `setData(Raster r)` Sets a rectangular region of the image to the contents of the specified `Raster` `r`, which is assumed to be in the same coordinate space as the `BufferedImage`.
`void` | `setRGB(int x, int y, int rgb)` Sets a pixel in this `BufferedImage` to the specified RGB value.
`void` | `setRGB(int startX, int startY, int w, int h, int[] rgbArray, int offset, int scansize)` Sets an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, into a portion of the image data.
`String` | `toString()` Returns a `String` representation of this `BufferedImage` object and its values.

Methods inherited from class java.awt.Image
`getScaledInstance`

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

Field Detail

### TYPE_CUSTOM

    public static final int TYPE_CUSTOM

  Image type is not recognized so it must be a customized image. This type is only used as a return value for the getType() method.

  See Also:
    Constant Field Values

### TYPE_INT_RGB

    public static final int TYPE_INT_RGB

  Represents an image with 8-bit RGB color components packed into integer pixels. The image has a `DirectColorModel` without alpha.

  See Also:
    Constant Field Values

### TYPE_INT_ARGB

    public static final int TYPE_INT_ARGB

  Represents an image with 8-bit RGBA color components packed into integer pixels. The image has a `DirectColorModel` with alpha. The color data in this image is considered not to be premultiplied with alpha. When this type is used as the `imageType` argument to a `BufferedImage` constructor, the created image is consistent with images created in the JDK1.1 and earlier releases.

  See Also:
    Constant Field Values

### TYPE_INT_ARGB_PRE

    public static final int TYPE_INT_ARGB_PRE

  Represents an image with 8-bit RGBA color components packed into integer pixels. The image has a `DirectColorModel` with alpha. The color data in this image is considered to be premultiplied with alpha.

  See Also:
    Constant Field Values

### TYPE_INT_BGR

    public static final int TYPE_INT_BGR

  Represents an image with 8-bit RGB color components, corresponding to a Windows- or Solaris- style BGR color model, with the colors Blue, Green, and Red packed into integer pixels. There is no alpha. The image has a `DirectColorModel`.

  See Also:
    Constant Field Values

### TYPE_3BYTE_BGR

    public static final int TYPE_3BYTE_BGR

  Represents an image with 8-bit RGB color components, corresponding to a Windows-style BGR color model) with the colors Blue, Green, and Red stored in 3 bytes. There is no alpha. The image has a `ComponentColorModel`.

  See Also:
    Constant Field Values

### TYPE_4BYTE_ABGR

    public static final int TYPE_4BYTE_ABGR

  Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha. The image has a `ComponentColorModel` with alpha. The color data in this image is considered not to be premultiplied with alpha. The byte data is interleaved in a single byte array in the order A, B, G, R from lower to higher byte addresses within each pixel.

  See Also:
    Constant Field Values

### TYPE_4BYTE_ABGR_PRE

    public static final int TYPE_4BYTE_ABGR_PRE

  Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha. The image has a `ComponentColorModel` with alpha. The color data in this image is considered to be premultiplied with alpha. The byte data is interleaved in a single byte array in the order A, B, G, R from lower to higher byte addresses within each pixel.

  See Also:
    Constant Field Values

### TYPE_USHORT_565_RGB

    public static final int TYPE_USHORT_565_RGB

  Represents an image with 5-6-5 RGB color components (5-bits red, 6-bits green, 5-bits blue) with no alpha. This image has a `DirectColorModel`.

  See Also:
    Constant Field Values

### TYPE_USHORT_555_RGB

    public static final int TYPE_USHORT_555_RGB

  Represents an image with 5-5-5 RGB color components (5-bits red, 5-bits green, 5-bits blue) with no alpha. This image has a `DirectColorModel`.

  See Also:
    Constant Field Values

### TYPE_BYTE_GRAY

    public static final int TYPE_BYTE_GRAY

  Represents a unsigned byte grayscale image, non-indexed. This image has a `ComponentColorModel` with a CS_GRAY `ColorSpace`.

  See Also:
    Constant Field Values

### TYPE_USHORT_GRAY

    public static final int TYPE_USHORT_GRAY

  Represents an unsigned short grayscale image, non-indexed). This image has a `ComponentColorModel` with a CS_GRAY `ColorSpace`.

  See Also:
    Constant Field Values

### TYPE_BYTE_BINARY

    public static final int TYPE_BYTE_BINARY

  Represents an opaque byte-packed 1, 2, or 4 bit image. The image has an `IndexColorModel` without alpha. When this type is used as the `imageType` argument to the `BufferedImage` constructor that takes an `imageType` argument but no `ColorModel` argument, a 1-bit image is created with an `IndexColorModel` with two colors in the default sRGB `ColorSpace`: {0, 0, 0} and {255, 255, 255}.

  Images with 2 or 4 bits per pixel may be constructed via the `BufferedImage` constructor that takes a `ColorModel` argument by supplying a `ColorModel` with an appropriate map size.

  Images with 8 bits per pixel should use the image types `TYPE_BYTE_INDEXED` or `TYPE_BYTE_GRAY` depending on their `ColorModel`.

  See Also:
    Constant Field Values

### TYPE_BYTE_INDEXED

    public static final int TYPE_BYTE_INDEXED

  Represents an indexed byte image. When this type is used as the `imageType` argument to the `BufferedImage` constructor that takes an `imageType` argument but no `ColorModel` argument, an `IndexColorModel` is created with a 256-color 6/6/6 color cube palette with the rest of the colors from 216-255 populated by grayscale values in the default sRGB ColorSpace.

  See Also:
    Constant Field Values

Constructor Detail

### BufferedImage

    public BufferedImage(int width,
                         int height,
                         int imageType)

  Constructs a `BufferedImage` of one of the predefined image types. The `ColorSpace` for the image is the default sRGB space.

Parameters:
  `width` - width of the created image
  `height` - height of the created image
  `imageType` - type of the created image
See Also:
  `ColorSpace`, `TYPE_INT_RGB`, `TYPE_INT_ARGB`, `TYPE_INT_ARGB_PRE`, `TYPE_INT_BGR`, `TYPE_3BYTE_BGR`, `TYPE_4BYTE_ABGR`, `TYPE_4BYTE_ABGR_PRE`, `TYPE_BYTE_GRAY`, `TYPE_USHORT_GRAY`, `TYPE_BYTE_BINARY`, `TYPE_BYTE_INDEXED`, `TYPE_USHORT_565_RGB`, `TYPE_USHORT_555_RGB`

### BufferedImage

    public BufferedImage(int width,
                         int height,
                         int imageType,
                         IndexColorModel cm)

  Constructs a `BufferedImage` of one of the predefined image types: TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED.

  If the image type is TYPE_BYTE_BINARY, the number of entries in the color model is used to determine whether the image should have 1, 2, or 4 bits per pixel. If the color model has 1 or 2 entries, the image will have 1 bit per pixel. If it has 3 or 4 entries, the image with have 2 bits per pixel. If it has between 5 and 16 entries, the image will have 4 bits per pixel. Otherwise, an IllegalArgumentException will be thrown.

Parameters:
  `width` - width of the created image
  `height` - height of the created image
  `imageType` - type of the created image
  `cm` - `IndexColorModel` of the created image
Throws:
  `IllegalArgumentException` - if the imageType is not TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED or if the imageType is TYPE_BYTE_BINARY and the color map has more than 16 entries.
See Also:
  `TYPE_BYTE_BINARY`, `TYPE_BYTE_INDEXED`

### BufferedImage

    public BufferedImage(ColorModel cm,
                         WritableRaster raster,
                         boolean isRasterPremultiplied,
                         Hashtable properties)

  Constructs a new `BufferedImage` with a specified `ColorModel` and `Raster`. If the number and types of bands in the `SampleModel` of the `Raster` do not match the number and types required by the `ColorModel` to represent its color and alpha components, a `RasterFormatException` is thrown. This method can multiply or divide the color `Raster` data by alpha to match the `alphaPremultiplied` state in the `ColorModel`. Properties for this `BufferedImage` can be established by passing in a `Hashtable` of `String`/`Object` pairs.

Parameters:
  `cm` - `ColorModel` for the new image
  `raster` - `Raster` for the image data
  `isRasterPremultiplied` - if `true`, the data in the raster has been premultiplied with alpha.
  `properties` - `Hashtable` of `String`/`Object` pairs.
Throws:
  ``RasterFormatException`` - if the number and types of bands in the `SampleModel` of the `Raster` do not match the number and types required by the `ColorModel` to represent its color and alpha components.
  ``IllegalArgumentException`` - if `raster` is incompatible with `cm`
See Also:
  `ColorModel`, `Raster`, `WritableRaster`

Method Detail

### getType

    public int getType()

  Returns the image type. If it is not one of the known types, TYPE_CUSTOM is returned.

  Returns:
    the image type of this `BufferedImage`.
  See Also:
    `TYPE_INT_RGB`, `TYPE_INT_ARGB`, `TYPE_INT_ARGB_PRE`, `TYPE_INT_BGR`, `TYPE_3BYTE_BGR`, `TYPE_4BYTE_ABGR`, `TYPE_4BYTE_ABGR_PRE`, `TYPE_BYTE_GRAY`, `TYPE_BYTE_BINARY`, `TYPE_BYTE_INDEXED`, `TYPE_USHORT_GRAY`, `TYPE_USHORT_565_RGB`, `TYPE_USHORT_555_RGB`, `TYPE_CUSTOM`

### getColorModel

    public ColorModel getColorModel()

  Returns the `ColorModel`.

  Specified by:
    `getColorModel` in interface `RenderedImage`
  Returns:
    the `ColorModel` of this `BufferedImage`.

### getRaster

    public WritableRaster getRaster()

  Returns the `WritableRaster`.

  Returns:
    the `WriteableRaster` of this `BufferedImage`.

### getAlphaRaster

    public WritableRaster getAlphaRaster()

  Returns a `WritableRaster` representing the alpha channel for `BufferedImage` objects with `ColorModel` objects that support a separate spatial alpha channel, such as `ComponentColorModel` and `DirectColorModel`. Returns `null` if there is no alpha channel associated with the `ColorModel` in this image. This method assumes that for all `ColorModel` objects other than `IndexColorModel`, if the `ColorModel` supports alpha, there is a separate alpha channel which is stored as the last band of image data. If the image uses an `IndexColorModel` that has alpha in the lookup table, this method returns `null` since there is no spatially discrete alpha channel. This method creates a new `WritableRaster`, but shares the data array.

  Returns:
    a `WritableRaster` or `null` if this `BufferedImage` has no alpha channel associated with its `ColorModel`.

### getRGB

    public int getRGB(int x,
                      int y)

  Returns an integer pixel in the default RGB color model (TYPE_INT_ARGB) and default sRGB colorspace. Color conversion takes place if this default model does not match the image `ColorModel`. There are only 8-bits of precision for each color component in the returned data when using this method.

  Returns:
    an integer pixel in the default RGB color model and default sRGB colorspace.
  See Also:
    `setRGB(int, int, int)`, `setRGB(int, int, int, int, int[], int, int)`

### getRGB

    public int[] getRGB(int startX,
                        int startY,
                        int w,
                        int h,
                        int[] rgbArray,
                        int offset,
                        int scansize)

  Returns an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, from a portion of the image data. Color conversion takes place if the default model does not match the image `ColorModel`. There are only 8-bits of precision for each color component in the returned data when using this method. With a specified coordinate (x, y) in the image, the ARGB pixel can be accessed in this way:

          pixel   = rgbArray[offset + (y-startY)*scansize + (x-startX)];

  Parameters:
    `w` - width of region
    `h` - height of region
    `rgbArray` - if not `null`, the rgb pixels are written here
    `offset` - offset into the `rgbArray`
    `scansize` - scanline stride for the `rgbArray`
  Returns:
    array of RGB pixels.
  Throws:
    ``IllegalArgumentException`` - if an unknown datatype is specified
  See Also:
    `setRGB(int, int, int)`, `setRGB(int, int, int, int, int[], int, int)`

### setRGB

    public void setRGB(int x,
                       int y,
                       int rgb)

  Sets a pixel in this `BufferedImage` to the specified RGB value. The pixel is assumed to be in the default RGB color model, TYPE_INT_ARGB, and default sRGB color space. For images with an `IndexColorModel`, the index with the nearest color is chosen.

  Parameters:
    `rgb` - the RGB value
  See Also:
    `getRGB(int, int)`, `getRGB(int, int, int, int, int[], int, int)`

### setRGB

    public void setRGB(int startX,
                       int startY,
                       int w,
                       int h,
                       int[] rgbArray,
                       int offset,
                       int scansize)

  Sets an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, into a portion of the image data. Color conversion takes place if the default model does not match the image `ColorModel`. There are only 8-bits of precision for each color component in the returned data when using this method. With a specified coordinate (x, y) in the this image, the ARGB pixel can be accessed in this way:

          pixel   = rgbArray[offset + (y-startY)*scansize + (x-startX)];

  WARNING: No dithering takes place.

  Parameters:
    `w` - width of the region
    `h` - height of the region
    `rgbArray` - the rgb pixels
    `offset` - offset into the `rgbArray`
    `scansize` - scanline stride for the `rgbArray`
  See Also:
    `getRGB(int, int)`, `getRGB(int, int, int, int, int[], int, int)`

### getWidth

    public int getWidth()

  Returns the width of the `BufferedImage`.

  Specified by:
    `getWidth` in interface `RenderedImage`
  Returns:
    the width of this `BufferedImage`

### getHeight

    public int getHeight()

  Returns the height of the `BufferedImage`.

  Specified by:
    `getHeight` in interface `RenderedImage`
  Returns:
    the height of this `BufferedImage`

### getWidth

    public int getWidth(ImageObserver observer)

  Returns the width of the `BufferedImage`.

  Specified by:
    `getWidth` in class `Image`
  Parameters:
    `observer` - ignored
  Returns:
    the width of this `BufferedImage`
  See Also:
    `Image.getHeight(java.awt.image.ImageObserver)`, `ImageObserver`

### getHeight

    public int getHeight(ImageObserver observer)

  Returns the height of the `BufferedImage`.

  Specified by:
    `getHeight` in class `Image`
  Parameters:
    `observer` - ignored
  Returns:
    the height of this `BufferedImage`
  See Also:
    `Image.getWidth(java.awt.image.ImageObserver)`, `ImageObserver`

### getSource

    public ImageProducer getSource()

  Returns the object that produces the pixels for the image.

  Specified by:
    `getSource` in class `Image`
  Returns:
    the `ImageProducer` that is used to produce the pixels for this image.
  See Also:
    `ImageProducer`

### getProperty

    public Object getProperty(String name,
                              ImageObserver observer)

  Returns a property of the image by name. Individual property names are defined by the various image formats. If a property is not defined for a particular image, this method returns the `UndefinedProperty` field. If the properties for this image are not yet known, then this method returns `null` and the `ImageObserver` object is notified later. The property name "comment" should be used to store an optional comment that can be presented to the user as a description of the image, its source, or its author.

  Specified by:
    `getProperty` in class `Image`
  Parameters:
    `name` - the property name
    `observer` - the `ImageObserver` that receives notification regarding image information
  Returns:
    an `Object` that is the property referred to by the specified `name` or `null` if the properties of this image are not yet known.
  See Also:
    `ImageObserver`, `Image.UndefinedProperty`

### getProperty

    public Object getProperty(String name)

  Returns a property of the image by name.

  Specified by:
    `getProperty` in interface `RenderedImage`
  Parameters:
    `name` - the property name
  Returns:
    an `Object` that is the property referred to by the specified `name`.
  See Also:
    `Image.UndefinedProperty`

### flush

    public void flush()

  Flushes all resources being used to cache optimization information. The underlying pixel data is unaffected.

  Specified by:
    `flush` in class `Image`

### getGraphics

    public Graphics getGraphics()

  This method returns a `Graphics2D`, but is here for backwards compatibility. `createGraphics` is more convenient, since it is declared to return a `Graphics2D`.

  Specified by:
    `getGraphics` in class `Image`
  Returns:
    a `Graphics2D`, which can be used to draw into this image.
  See Also:
    `Graphics`, `Component.createImage(int, int)`

### createGraphics

    public Graphics2D createGraphics()

  Creates a `Graphics2D`, which can be used to draw into this `BufferedImage`.

  Returns:
    a `Graphics2D`, used for drawing into this image.

### getSubimage

    public BufferedImage getSubimage(int x,
                                     int y,
                                     int w,
                                     int h)

  Returns a subimage defined by a specified rectangular region. The returned `BufferedImage` shares the same data array as the original image.

  Parameters:
    `w` - the width of the specified rectangular region
    `h` - the height of the specified rectangular region
  Returns:
    a `BufferedImage` that is the subimage of this `BufferedImage`.
  Throws:
    ``RasterFormatException`` - if the specified area is not contained within this `BufferedImage`.

### isAlphaPremultiplied

    public boolean isAlphaPremultiplied()

  Returns whether or not the alpha has been premultiplied. It returns `true` if there is no alpha since the default alpha is OPAQUE.

  Returns:
    `true` if the alpha has been premultiplied; `false` otherwise.

### coerceData

    public void coerceData(boolean isAlphaPremultiplied)

  Forces the data to match the state specified in the `isAlphaPremultiplied` variable. It may multiply or divide the color raster data by alpha, or do nothing if the data is in the correct state.

  Parameters:
    `isAlphaPremultiplied` - `true` if the alpha has been premultiplied; `false` otherwise.

### toString

    public String toString()

  Returns a `String` representation of this `BufferedImage` object and its values.

  Overrides:
    `toString` in class `Object`
  Returns:
    a `String` representing this `BufferedImage`.

### getSources

    public Vector getSources()

  Returns a `Vector` of `RenderedImage` objects that are the immediate sources, not the sources of these immediate sources, of image data for this `BufferedImage`. This method returns `null` if the `BufferedImage` has no information about its immediate sources. It returns an empty `Vector` if the `BufferedImage` has no immediate sources.

  Specified by:
    `getSources` in interface `RenderedImage`
  Returns:
    a `Vector` containing immediate sources of this `BufferedImage` object's image date, or `null` if this `BufferedImage` has no information about its immediate sources, or an empty `Vector` if this `BufferedImage` has no immediate sources.

### getPropertyNames

    public String[] getPropertyNames()

  Returns an array of names recognized by `getProperty(String)` or `null`, if no property names are recognized.

  Specified by:
    `getPropertyNames` in interface `RenderedImage`
  Returns:
    a `String` array containing all of the property names that `getProperty(String)` recognizes; or `null` if no property names are recognized.

### getMinX

    public int getMinX()

  Returns the minimum x coordinate of this `BufferedImage`. This is always zero.

  Specified by:
    `getMinX` in interface `RenderedImage`
  Returns:
    the minimum x coordinate of this `BufferedImage`.

### getMinY

    public int getMinY()

  Returns the minimum y coordinate of this `BufferedImage`. This is always zero.

  Specified by:
    `getMinY` in interface `RenderedImage`
  Returns:
    the minimum y coordinate of this `BufferedImage`.

### getSampleModel

    public SampleModel getSampleModel()

  Returns the `SampleModel` associated with this `BufferedImage`.

  Specified by:
    `getSampleModel` in interface `RenderedImage`
  Returns:
    the `SampleModel` of this `BufferedImage`.

### getNumXTiles

    public int getNumXTiles()

  Returns the number of tiles in the x direction. This is always one.

  Specified by:
    `getNumXTiles` in interface `RenderedImage`
  Returns:
    the number of tiles in the x direction.

### getNumYTiles

    public int getNumYTiles()

  Returns the number of tiles in the y direction. This is always one.

  Specified by:
    `getNumYTiles` in interface `RenderedImage`
  Returns:
    the number of tiles in the y direction.

### getMinTileX

    public int getMinTileX()

  Returns the minimum tile index in the x direction. This is always zero.

  Specified by:
    `getMinTileX` in interface `RenderedImage`
  Returns:
    the minimum tile index in the x direction.

### getMinTileY

    public int getMinTileY()

  Returns the minimum tile index in the y direction. This is always zero.

  Specified by:
    `getMinTileY` in interface `RenderedImage`
  Returns:
    the mininum tile index in the y direction.

### getTileWidth

    public int getTileWidth()

  Returns the tile width in pixels.

  Specified by:
    `getTileWidth` in interface `RenderedImage`
  Returns:
    the tile width in pixels.

### getTileHeight

    public int getTileHeight()

  Returns the tile height in pixels.

  Specified by:
    `getTileHeight` in interface `RenderedImage`
  Returns:
    the tile height in pixels.

### getTileGridXOffset

    public int getTileGridXOffset()

  Returns the x offset of the tile grid relative to the origin, For example, the x coordinate of the location of tile (0, 0). This is always zero.

  Specified by:
    `getTileGridXOffset` in interface `RenderedImage`
  Returns:
    the x offset of the tile grid.

### getTileGridYOffset

    public int getTileGridYOffset()

  Returns the y offset of the tile grid relative to the origin, For example, the y coordinate of the location of tile (0, 0). This is always zero.

  Specified by:
    `getTileGridYOffset` in interface `RenderedImage`
  Returns:
    the y offset of the tile grid.

### getTile

    public Raster getTile(int tileX,
                          int tileY)

  Returns tile (`tileX`, `tileY`). Note that `tileX` and `tileY` are indices into the tile array, not pixel locations. The `Raster` that is returned is live, which means that it is updated if the image is changed.

  Specified by:
    `getTile` in interface `RenderedImage`
  Parameters:
    `tileX` - the x index of the requested tile in the tile array
    `tileY` - the y index of the requested tile in the tile array
  Returns:
    a `Raster` that is the tile defined by the arguments `tileX` and `tileY`.
  Throws:
    ``ArrayIndexOutOfBoundsException`` - if both `tileX` and `tileY` are not equal to 0

### getData

    public Raster getData()

  Returns the image as one large tile. The `Raster` returned is a copy of the image data is not updated if the image is changed.

  Specified by:
    `getData` in interface `RenderedImage`
  Returns:
    a `Raster` that is a copy of the image data.
  See Also:
    `setData(Raster)`

### getData

    public Raster getData(Rectangle rect)

  Computes and returns an arbitrary region of the `BufferedImage`. The `Raster` returned is a copy of the image data and is not updated if the image is changed.

  Specified by:
    `getData` in interface `RenderedImage`
  Parameters:
    `rect` - the region of the `BufferedImage` to be returned.
  Returns:
    a `Raster` that is a copy of the image data of the specified region of the `BufferedImage`
  See Also:
    `setData(Raster)`

### copyData

    public WritableRaster copyData(WritableRaster outRaster)

  Computes an arbitrary rectangular region of the `BufferedImage` and copies it into a specified `WritableRaster`. The region to be computed is determined from the bounds of the specified `WritableRaster`. The specified `WritableRaster` must have a `SampleModel` that is compatible with this image. If `outRaster` is `null`, an appropriate `WritableRaster` is created.

  Specified by:
    `copyData` in interface `RenderedImage`
  Parameters:
    `outRaster` - a `WritableRaster` to hold the returned part of the image, or `null`
  Returns:
    a reference to the supplied or created `WritableRaster`.

### setData

    public void setData(Raster r)

  Sets a rectangular region of the image to the contents of the specified `Raster` `r`, which is assumed to be in the same coordinate space as the `BufferedImage`. The operation is clipped to the bounds of the `BufferedImage`.

  Specified by:
    `setData` in interface `WritableRenderedImage`
  Parameters:
    `r` - the specified `Raster`
  See Also:
    `getData()`, `getData(Rectangle)`

### addTileObserver

    public void addTileObserver(TileObserver to)

  Adds a tile observer. If the observer is already present, it receives multiple notifications.

  Specified by:
    `addTileObserver` in interface `WritableRenderedImage`
  Parameters:
    `to` - the specified `TileObserver`

### removeTileObserver

    public void removeTileObserver(TileObserver to)

  Removes a tile observer. If the observer was not registered, nothing happens. If the observer was registered for multiple notifications, it is now registered for one fewer notification.

  Specified by:
    `removeTileObserver` in interface `WritableRenderedImage`
  Parameters:
    `to` - the specified `TileObserver`.

### isTileWritable

    public boolean isTileWritable(int tileX,
                                  int tileY)

  Returns whether or not a tile is currently checked out for writing.

  Specified by:
    `isTileWritable` in interface `WritableRenderedImage`
  Parameters:
    `tileX` - the x index of the tile.
    `tileY` - the y index of the tile.
  Returns:
    `true` if the tile specified by the specified indices is checked out for writing; `false` otherwise.
  Throws:
    ``ArrayIndexOutOfBoundsException`` - if both `tileX` and `tileY` are not equal to 0

### getWritableTileIndices

    public Point[] getWritableTileIndices()

  Returns an array of `Point` objects indicating which tiles are checked out for writing. Returns `null` if none are checked out.

  Specified by:
    `getWritableTileIndices` in interface `WritableRenderedImage`
  Returns:
    a `Point` array that indicates the tiles that are checked out for writing, or `null` if no tiles are checked out for writing.

### hasTileWriters

    public boolean hasTileWriters()

  Returns whether or not any tile is checked out for writing. Semantically equivalent to

       (getWritableTileIndices() != null).

  Specified by:
    `hasTileWriters` in interface `WritableRenderedImage`
  Returns:
    `true` if any tile is checked out for writing; `false` otherwise.

### getWritableTile

    public WritableRaster getWritableTile(int tileX,
                                          int tileY)

  Checks out a tile for writing. All registered `TileObservers` are notified when a tile goes from having no writers to having one writer.

  Specified by:
    `getWritableTile` in interface `WritableRenderedImage`
  Parameters:
    `tileX` - the x index of the tile
    `tileY` - the y index of the tile
  Returns:
    a `WritableRaster` that is the tile, indicated by the specified indices, to be checked out for writing.

### releaseWritableTile

    public void releaseWritableTile(int tileX,
                                    int tileY)

  Relinquishes permission to write to a tile. If the caller continues to write to the tile, the results are undefined. Calls to this method should only appear in matching pairs with calls to `getWritableTile(int, int)`. Any other leads to undefined results. All registered `TileObservers` are notified when a tile goes from having one writer to having no writers.

  Specified by:
    `releaseWritableTile` in interface `WritableRenderedImage`
  Parameters:
    `tileX` - the x index of the tile
    `tileY` - the y index of the tile

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| JavaTM 2 Platform Std. Ed. v1.4.1
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.