uTools-Manuals/docs/java/javax/imageio/plugins/jpeg/JPEGImageReadParam.html

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     javax.imageio.plugins.jpeg 
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<h2 class="title" title="Class JPEGImageReadParam">Class JPEGImageReadParam</h2>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">JPEGImageReadParam</span>
extends <a href="../../../../javax/imageio/ImageReadParam.html" title="class in javax.imageio">ImageReadParam</a></pre>
<div class="block">
<span>该类增加了在使用内置JPEG阅读器插件时设置JPEG量化和霍夫曼表的功能。</span>
<span>该类的一个实例将从内置JPEG <code>ImageReader</code>的<code>getDefaultImageReadParam</code>方法返回。</span>
<p> <span>这些添加的唯一目的是允许用于解码缩写流的表的规范。</span> <span>内置的JPEG阅读器也将接受一个普通的<code>ImageReadParam</code> ，这对于解码非缩写流是足够的。</span> </p>
<p> <span>虽然缩写流的表格通常是通过首先阅读另一个仅包含表格的缩略图流而获得的，但在某些应用程序中，表格提前固定。</span> <span>该类允许从客户端代码直接指定表。</span> <span>如果没有在流中或在<code>JPEGImageReadParam</code>中指定<code>JPEGImageReadParam</code> ，则该流被假定使用“标准”视觉无损表。</span> <span>有关默认表的更多信息，请参阅<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="javax.imageio.plugins.jpeg中的类"><code>JPEGQTable</code></a>和<a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="javax.imageio.plugins.jpeg中的类"><code>JPEGHuffmanTable</code></a> 。</span> </p>
<p> <span>内置JPEG读取器的<code>getDefaultReadParam</code>方法返回的默认值<code>JPEGImageReadParam</code>不包含表。</span> <span>默认表可以从表<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="javax.imageio.plugins.jpeg中的类"><code>JPEGQTable</code></a>和<a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="javax.imageio.plugins.jpeg中的类"><code>JPEGHuffmanTable</code></a>表获得。</span> </p>
<p> <span>如果流包含表，则忽略<code>JPEGImageReadParam</code>中给出的表。</span> <span>此外，如果流中的第一图像包含表，并且后续的图像不包含表，则在第一图像中给出的表用于所有缩写图像。</span> <span>一旦从流中读取表，只能由随后从同一个流读取的表覆盖它们。</span> <span>为了指定新的表，必须调用读者的<a href="../../../../javax/imageio/ImageReader.html#setInput-java.lang.Object-boolean-boolean-"><code>setInput</code></a>方法来更改流。</span> </p>
<p> <span>请注意，此类不提供获取流中找到的表的方法。</span> <span>这些可以通过查阅读者返回的IIOMetadata对象从流中提取出来。</span> </p>
<p> <span>有关内置JPEG插件的操作的更多信息，请参阅<a href="../../metadata/doc-files/jpeg_metadata.html">JPEG metadata format specification and usage notes</a> 。</span> </p>
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<!-- --> </a> <h3>Fields inherited from class javax.imageio.<a href="../../../../javax/imageio/IIOParam.html" title="class in javax.imageio">IIOParam</a></h3> <code><a href="../../../../javax/imageio/IIOParam.html#controller">controller</a>, <a href="../../../../javax/imageio/IIOParam.html#defaultController">defaultController</a>, <a href="../../../../javax/imageio/IIOParam.html#destinationOffset">destinationOffset</a>, <a href="../../../../javax/imageio/IIOParam.html#destinationType">destinationType</a>, <a href="../../../../javax/imageio/IIOParam.html#sourceBands">sourceBands</a>, <a href="../../../../javax/imageio/IIOParam.html#sourceRegion">sourceRegion</a>, <a href="../../../../javax/imageio/IIOParam.html#sourceXSubsampling">sourceXSubsampling</a>, <a href="../../../../javax/imageio/IIOParam.html#sourceYSubsampling">sourceYSubsampling</a>, <a href="../../../../javax/imageio/IIOParam.html#subsamplingXOffset">subsamplingXOffset</a>, <a href="../../../../javax/imageio/IIOParam.html#subsamplingYOffset">subsamplingYOffset</a></code></li>
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<caption>
<span>构造方法</span>
<span class="tabEnd"> </span>
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<tbody>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#JPEGImageReadParam--">JPEGImageReadParam</a></span>()</code>
<div class="block">
              构造一个 
             <code>JPEGImageReadParam</code> 。 
            </div> </td>
</tr>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor" id="i0">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#areTablesSet--">areTablesSet</a></span>()</code>
<div class="block">
              如果表当前设置，则返回 
             <code>true</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code><a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#getACHuffmanTables--">getACHuffmanTables</a></span>()</code>
<div class="block">
              返回在最近一次调用设置阿克·哈弗曼表的数组的副本 
             <code>setDecodeTables</code> ，或 
             <code>null</code>如果表当前没有设置。 
            </div> </td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code><a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#getDCHuffmanTables--">getDCHuffmanTables</a></span>()</code>
<div class="block">
              返回在最近一次调用设置为德克·哈弗曼表的数组的副本 
             <code>setDecodeTables</code> ，或 
             <code>null</code>如果表当前没有设置。 
            </div> </td>
</tr>
<tr class="rowColor" id="i3">
<td class="colFirst"><code><a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#getQTables--">getQTables</a></span>()</code>
<div class="block">
              返回在最近调用 
             <code>setDecodeTables</code>或 
             <code>null</code>如果表当前未设置）时设置的量化表数组的副本。 
            </div> </td>
</tr>
<tr class="altColor" id="i4">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-">setDecodeTables</a></span>(<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a>[] qTables, <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] DCHuffmanTables, <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] ACHuffmanTables)</code>
<div class="block">
              设置用于解码缩写流的量化和霍夫曼表。 
            </div> </td>
</tr>
<tr class="rowColor" id="i5">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#unsetDecodeTables--">unsetDecodeTables</a></span>()</code>
<div class="block">
              删除当前设置的任何量化和霍夫曼表。 
            </div> </td>
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<!-- --> </a> <h3>Methods inherited from class javax.imageio.<a href="../../../../javax/imageio/ImageReadParam.html" title="class in javax.imageio">ImageReadParam</a></h3> <code><a href="../../../../javax/imageio/ImageReadParam.html#canSetSourceRenderSize--">canSetSourceRenderSize</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getDestination--">getDestination</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getDestinationBands--">getDestinationBands</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getSourceMaxProgressivePass--">getSourceMaxProgressivePass</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getSourceMinProgressivePass--">getSourceMinProgressivePass</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getSourceNumProgressivePasses--">getSourceNumProgressivePasses</a>, <a href="../../../../javax/imageio/ImageReadParam.html#getSourceRenderSize--">getSourceRenderSize</a>, <a href="../../../../javax/imageio/ImageReadParam.html#setDestination-java.awt.image.BufferedImage-">setDestination</a>, <a href="../../../../javax/imageio/ImageReadParam.html#setDestinationBands-int:A-">setDestinationBands</a>, <a href="../../../../javax/imageio/ImageReadParam.html#setDestinationType-javax.imageio.ImageTypeSpecifier-">setDestinationType</a>, <a href="../../../../javax/imageio/ImageReadParam.html#setSourceProgressivePasses-int-int-">setSourceProgressivePasses</a>, <a href="../../../../javax/imageio/ImageReadParam.html#setSourceRenderSize-java.awt.Dimension-">setSourceRenderSize</a></code></li>
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<li class="blockList"> <h4>JPEGImageReadParam</h4> <pre>public JPEGImageReadParam()</pre>
<div class="block">
            构造一个 
           <code>JPEGImageReadParam</code> 。 
          </div> </li>
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</ul>
<!-- ============ METHOD DETAIL ========== -->
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<li class="blockList"> <h4>areTablesSet</h4> <pre>public boolean areTablesSet()</pre>
<div class="block">
            如果表当前设置，则返回 
           <code>true</code> 。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
<code>true</code>如果表存在。 
           </dd>
</dl> </li>
</ul> <a name="setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-">
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<li class="blockList"> <h4>setDecodeTables</h4> <pre>public void setDecodeTables(<a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a>[] qTables,
                            <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] DCHuffmanTables,
                            <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] ACHuffmanTables)</pre>
<div class="block">
<span>设置用于解码缩写流的量化和霍夫曼表。</span>
<span>每种类型最多可能有4个表。</span>
<span>一旦在流中遇到表，就忽略这些表。</span>
<span>所有参数必须为非<code>null</code> 。</span>
<span>霍夫曼表的两个阵列必须具有相同数量的元素。</span>
<span>流中的帧和扫描头中的表格符号被假定为等同于这些数组中的索引。</span>
<span>参数数组由此方法复制。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>qTables</code> - 量化表对象的数组。 
           </dd>
<dd>
<code>DCHuffmanTables</code> - 一个霍夫曼表对象数组。 
           </dd>
<dd>
<code>ACHuffmanTables</code> - 一个霍夫曼表对象数组。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果任何参数是 
            <code>null</code> ，有超过4个元素，或者DC和AC表的数量不同。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#unsetDecodeTables--"><code>unsetDecodeTables()</code></a>
</dd>
</dl> </li>
</ul> <a name="unsetDecodeTables--">
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<ul class="blockList">
<li class="blockList"> <h4>unsetDecodeTables</h4> <pre>public void unsetDecodeTables()</pre>
<div class="block">
            删除当前设置的任何量化和霍夫曼表。 
          </div>
<dl>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-"><code>setDecodeTables(javax.imageio.plugins.jpeg.JPEGQTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[])</code></a>
</dd>
</dl> </li>
</ul> <a name="getQTables--">
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<ul class="blockList">
<li class="blockList"> <h4>getQTables</h4> <pre>public <a href="../../../../javax/imageio/plugins/jpeg/JPEGQTable.html" title="class in javax.imageio.plugins.jpeg">JPEGQTable</a>[] getQTables()</pre>
<div class="block">
            返回在最近一次调用设置的量化表所组成数组的一个副本 
           <code>setDecodeTables</code> ，或 
           <code>null</code>如果表当前没有设置。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一组 
            <code>JPEGQTable</code>对象，或 
            <code>null</code> 。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-"><code>setDecodeTables(javax.imageio.plugins.jpeg.JPEGQTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[])</code></a>
</dd>
</dl> </li>
</ul> <a name="getDCHuffmanTables--">
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<ul class="blockList">
<li class="blockList"> <h4>getDCHuffmanTables</h4> <pre>public <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] getDCHuffmanTables()</pre>
<div class="block">
            返回在最近一次调用设置为德克·哈弗曼表的数组的副本 
           <code>setDecodeTables</code> ，或 
           <code>null</code>如果表当前没有设置。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一组 
            <code>JPEGHuffmanTable</code>对象，或 
            <code>null</code> 。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-"><code>setDecodeTables(javax.imageio.plugins.jpeg.JPEGQTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[])</code></a>
</dd>
</dl> </li>
</ul> <a name="getACHuffmanTables--">
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<ul class="blockListLast">
<li class="blockList"> <h4>getACHuffmanTables</h4> <pre>public <a href="../../../../javax/imageio/plugins/jpeg/JPEGHuffmanTable.html" title="class in javax.imageio.plugins.jpeg">JPEGHuffmanTable</a>[] getACHuffmanTables()</pre>
<div class="block">
            返回在最近一次调用设置阿克·哈弗曼表的数组的副本 
           <code>setDecodeTables</code> ，或 
           <code>null</code>如果表当前没有设置。 
          </div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一组 
            <code>JPEGHuffmanTable</code>对象，或 
            <code>null</code> 。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../../javax/imageio/plugins/jpeg/JPEGImageReadParam.html#setDecodeTables-javax.imageio.plugins.jpeg.JPEGQTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-javax.imageio.plugins.jpeg.JPEGHuffmanTable:A-"><code>setDecodeTables(javax.imageio.plugins.jpeg.JPEGQTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[], javax.imageio.plugins.jpeg.JPEGHuffmanTable[])</code></a>
</dd>
</dl> </li>
</ul> </li>
</ul> </li>
</ul>
</div>
</div>