BMPImageWriteParam (Java Platform SE 6) - JavaTM 2 Platform Standard Edition 6.0 API 规范中文版

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Java^TM Platform
Standard Ed. 6

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摘要：嵌套 | 字段 | 构造方法 | 方法

详细信息：字段 | 构造方法 | 方法

javax.imageio.plugins.bmp
类 BMPImageWriteParam

java.lang.Object
  javax.imageio.IIOParam
      javax.imageio.ImageWriteParam
          javax.imageio.plugins.bmp.BMPImageWriteParam

public class BMPImageWriteParam
extends ImageWriteParam
extends ImageWriteParam

用于以 BMP 格式编码图像的 ImageWriteParam 的子类。

此类允许在编写 BMP 格式图像文件时使用各种参数规范。默认情况下，数据布局是从下到上的，这样像素以从下到上的顺序存储，第一个扫描行存储在最后。

通过使用 setCompressionType() 方法结合适当的类型字符串，可以指定使用特定的压缩方案。当且仅当指定的压缩方案与要编写的图像的类型兼容时，指定的压缩方案才能实施。如果指定的压缩方案与要编写的图像的类型不兼容，则 BMP 图像 writer 将抛出 IOException。如果压缩类型不是显式设置的，则 getCompressionType() 将返回 null。在这种情况下，BMP 图像 writer 将选择支持给定图像的编码而不损失颜色分辨率的压缩类型。

下表列出了压缩类型字符串以及各自支持的图像类型：

压缩类型
类型字符串描述图像类型

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

**压缩类型**
类型字符串	描述	图像类型
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

字段摘要

从类 javax.imageio.ImageWriteParam 继承的字段

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

从类 javax.imageio.IIOParam 继承的字段

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

构造方法摘要

BMPImageWriteParam()
          构造一个所有参数均为默认值并具有为 null 的 Locale 的 BMPImageWriteParam 对象。

BMPImageWriteParam(Locale locale)
          构造一个设置为使用给定 Locale 并且所有参数都采用默认值的 BMPImageWriteParam。

方法摘要

boolean isTopDown()
          返回 topDown 参数的值。

void setTopDown(boolean topDown)
          如果设置，则数据以从上到下的方式写出，首先写出第一个扫描行。

从类 javax.imageio.ImageWriteParam 继承的方法

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

从类 javax.imageio.IIOParam 继承的方法

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

从类 java.lang.Object 继承的方法

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

从类 javax.imageio.ImageWriteParam 继承的字段
`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`

从类 javax.imageio.IIOParam 继承的字段
`controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset`

构造方法摘要
`BMPImageWriteParam()` 构造一个所有参数均为默认值并具有为 `null` 的 `Locale` 的 `BMPImageWriteParam` 对象。
`BMPImageWriteParam(Locale locale)` 构造一个设置为使用给定 `Locale` 并且所有参数都采用默认值的 `BMPImageWriteParam`。

方法摘要
`boolean`	`isTopDown()` 返回 `topDown` 参数的值。
`void`	`setTopDown(boolean topDown)` 如果设置，则数据以从上到下的方式写出，首先写出第一个扫描行。

从类 javax.imageio.ImageWriteParam 继承的方法
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

从类 javax.imageio.IIOParam 继承的方法
`activateController, getController, getDefaultController, getDestinationOffset, getDestinationType, getSourceBands, getSourceRegion, getSourceXSubsampling, getSourceYSubsampling, getSubsamplingXOffset, getSubsamplingYOffset, hasController, setController, setDestinationOffset, setDestinationType, setSourceBands, setSourceRegion, setSourceSubsampling`

从类 java.lang.Object 继承的方法
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

构造方法详细信息