com.sun.media.imageio.plugins.bmp

Class BMPImageWriteParam

java.lang.Object

javax.imageio.IIOParam

javax.imageio.ImageWriteParam

com.sun.media.imageio.plugins.bmp.BMPImageWriteParam

public class BMPImageWriteParam
extends ImageWriteParam

A subclass of ImageWriteParam for encoding images in the BMP format.

This class allows for the specification of various parameters while writing a BMP format image file. By default, the data layout is bottom-up, such that the pixels are stored in bottom-up order, the first scanline being stored last.

The particular compression scheme to be used can be specified by using the setCompressionType() method with the appropriate type string. The compression scheme specified will be honored if and only if it is compatible with the type of image being written. If the specified compression scheme is not compatible with the type of image being written then the IOException will be thrown by the BMP image writer. If the compression type is not set explicitly then getCompressionType() will return null. In this case the BMP image writer will select a compression type that supports encoding of the given image without loss of the color resolution.

The compression type strings and the image type(s) each supports are listed in the following table:

Compression Types

Type String	Description	Image Types
BI_RGB	Uncompressed RLE	<= 8-bits/sample
BI_RLE8	8-bit Run Length Encoding	<= 8-bits/sample
BI_RLE4	4-bit Run Length Encoding	<= 4-bits/sample
BI_BITFIELDS	Packed data	16 or 32 bits/sample
BI_JPEG	JPEG encoded	grayscale or RGB image

When BI_BITFIELDS is used, if the image encoded has a DirectColorModel, the bit mask in the color model will be written into the stream. Otherwise, only 5-5-5 16-bit image or 8-8-8 32-bit images are supported.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	topDown
static int	VERSION_2 Deprecated.
static int	VERSION_3 Deprecated.
static int	VERSION_4 Deprecated.
static int	VERSION_5 Deprecated.

Fields inherited from class javax.imageio.ImageWriteParam

canOffsetTiles, canWriteCompressed, canWriteProgressive, canWriteTiles, compressionMode, compressionQuality, compressionType, compressionTypes, locale, MODE_COPY_FROM_METADATA, MODE_DEFAULT, MODE_DISABLED, MODE_EXPLICIT, preferredTileSizes, progressiveMode, tileGridXOffset, tileGridYOffset, tileHeight, tileWidth, tilingMode, tilingSet

Fields inherited from class javax.imageio.IIOParam

controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset

Constructor Summary

Constructors

Constructor and Description
BMPImageWriteParam() Constructs an BMPImageWriteParam object with default values for all parameters and a null Locale.
BMPImageWriteParam(Locale locale) Constructs a BMPImageWriteParam set to use a given Locale and with default values for all parameters.

Method Summary

Methods

Modifier and Type	Method and Description
int	getVersion() Deprecated.
boolean	isTopDown() Returns the value of the topDown parameter.
void	setCompressionType(String compressionType) Sets the compression type to one of the values indicated by getCompressionTypes.
void	setTopDown(boolean topDown) If set, the data will be written out in a top-down manner, the first scanline being written first.

Methods inherited from class javax.imageio.ImageWriteParam

canOffsetTiles, canWriteCompressed, canWriteProgressive, canWriteTiles, getBitRate, getCompressionMode, getCompressionQuality, getCompressionQualityDescriptions, getCompressionQualityValues, getCompressionType, getCompressionTypes, getLocale, getLocalizedCompressionTypeName, getPreferredTileSizes, getProgressiveMode, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileWidth, getTilingMode, isCompressionLossless, setCompressionMode, setCompressionQuality, setProgressiveMode, setTiling, setTilingMode, unsetCompression, unsetTiling

Methods inherited from class javax.imageio.IIOParam

activateController, getController, getDefaultController, getDestinationOffset, getDestinationType, getSourceBands, getSourceRegion, getSourceXSubsampling, getSourceYSubsampling, getSubsamplingXOffset, getSubsamplingYOffset, hasController, setController, setDestinationOffset, setDestinationType, setSourceBands, setSourceRegion, setSourceSubsampling

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

VERSION_2

public static final int VERSION_2

Deprecated.

Constant for BMP version 2.

See Also:

Constant Field Values

VERSION_3

public static final int VERSION_3

Deprecated.

Constant for BMP version 3.

See Also:

Constant Field Values

VERSION_4

public static final int VERSION_4

Deprecated.

Constant for BMP version 4.

See Also:

Constant Field Values

VERSION_5

public static final int VERSION_5

Deprecated.

Constant for BMP version 5.

See Also:

Constant Field Values

topDown

private boolean topDown

Constructor Detail

BMPImageWriteParam

public BMPImageWriteParam(Locale locale)

Constructs a BMPImageWriteParam set to use a given Locale and with default values for all parameters.

Parameters:

locale - a Locale to be used to localize compression type names and quality descriptions, or null.

BMPImageWriteParam

public BMPImageWriteParam()

Constructs an BMPImageWriteParam object with default values for all parameters and a null Locale.

Method Detail

getVersion

public int getVersion()

Deprecated.

Returns the BMP version to be used. The default is VERSION_3.

Returns:

the BMP version number.

setTopDown

public void setTopDown(boolean topDown)

If set, the data will be written out in a top-down manner, the first scanline being written first. Any compression other than BI_RGB or BI_BITFIELDS is incompatible with the data being written in top-down order. Setting the topDown argument to true will be honored only when the compression type at the time of writing the image is one of the two mentioned above. Otherwise, the topDown setting will be ignored.

Parameters:

topDown - whether the data are written in top-down order.

isTopDown

public boolean isTopDown()

Returns the value of the topDown parameter. The default is false.

Returns:

whether the data are written in top-down order.

setCompressionType

public void setCompressionType(String compressionType)

Sets the compression type to one of the values indicated by getCompressionTypes. If a value of null is passed in, any previous setting is removed.

The method first invokes setCompressionType() with the supplied value of compressionType. Next, if isTopDown() returns true and the value of compressionType is incompatible with top-down order, setTopDown(boolean) is invoked with parameter topDown set to false. The image will then be written in bottom-up order with the specified compressionType.

Overrides:

setCompressionType in class ImageWriteParam

Parameters:

compressionType - one of the Strings returned by getCompressionTypes, or null to remove any previous setting.

Throws:

UnsupportedOperationException - if the writer does not support compression.

IllegalStateException - if the compression mode is not MODE_EXPLICIT.

UnsupportedOperationException - if there are no settable compression types.

IllegalArgumentException - if compressionType is non-null but is not one of the values returned by getCompressionTypes.

See Also:

isTopDown(), setTopDown(boolean), ImageWriteParam.getCompressionTypes(), ImageWriteParam.getCompressionType(), ImageWriteParam.unsetCompression()