- java.lang.Object
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- javax.imageio.IIOParam
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- javax.imageio.ImageWriteParam
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- javax.imageio.plugins.bmp.BMPImageWriteParam
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public class BMPImageWriteParam extends ImageWriteParam
A subclass ofImageWriteParam
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 theIOException
will be thrown by the BMP image writer. If the compression type is not set explicitly thengetCompressionType()
will returnnull
. 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
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Field Summary
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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
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Fields inherited from class javax.imageio.IIOParam
controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset
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Constructor Summary
Constructors Constructor and Description BMPImageWriteParam()
Constructs anBMPImageWriteParam
object with default values for all parameters and anull
Locale
.BMPImageWriteParam(Locale locale)
Constructs aBMPImageWriteParam
set to use a givenLocale
and with default values for all parameters.
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Method Summary
Methods Modifier and Type Method and Description boolean
isTopDown()
Returns the value of thetopDown
parameter.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, setCompressionType, setProgressiveMode, setTiling, setTilingMode, unsetCompression, unsetTiling
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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
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Constructor Detail
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BMPImageWriteParam
public BMPImageWriteParam(Locale locale)
Constructs aBMPImageWriteParam
set to use a givenLocale
and with default values for all parameters.- Parameters:
locale
- aLocale
to be used to localize compression type names and quality descriptions, ornull
.
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BMPImageWriteParam
public BMPImageWriteParam()
Constructs anBMPImageWriteParam
object with default values for all parameters and anull
Locale
.
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Method Detail
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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.- Parameters:
topDown
- whether the data are written in top-down order.
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isTopDown
public boolean isTopDown()
Returns the value of thetopDown
parameter. The default isfalse
.- Returns:
- whether the data are written in top-down order.
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Source du document imprimé : https://www.gaudry.be/java-api-rf-javax/imageio/plugins/bmp/bmpimagewriteparam.html
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