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mozjpeg/java/doc/org/libjpegturbo/turbojpeg/TJTransformer.html
DRC 6d9591703f Minor TurboJPEG doc tweaks 
- When transforming, the worst-case JPEG buffer size depends on the
  subsampling level used in the destination image, since a grayscale
  transform might have been applied.

- Parentheses Police
2024-09-05 22:31:40 -04:00

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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.libjpegturbo.turbojpeg</a></div>
<h2 title="Class TJTransformer" class="title">Class TJTransformer</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">org.libjpegturbo.turbojpeg.TJDecompressor</a></li>
<li>
<ul class="inheritance">
<li>org.libjpegturbo.turbojpeg.TJTransformer</li>
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<hr>
<pre>public class <span class="typeNameLabel">TJTransformer</span>
extends <a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a></pre>
<div class="block">TurboJPEG lossless transformer</div>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">TJTransformer</a></span>()</code></th>
<td class="colLast">
<div class="block">Create a TurboJPEG lossless transformer instance.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(byte%5B%5D)">TJTransformer</a></span>&#8203;(byte[]&nbsp;jpegImage)</code></th>
<td class="colLast">
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image stored in <code>jpegImage</code> with the newly created
instance.</div>
</td>
</tr>
<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(byte%5B%5D,int)">TJTransformer</a></span>&#8203;(byte[]&nbsp;jpegImage,
int&nbsp;imageSize)</code></th>
<td class="colLast">
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image of length <code>imageSize</code> bytes stored in
<code>jpegImage</code> with the newly created instance.</div>
</td>
</tr>
</table>
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<td class="colFirst"><code>int[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTransformedSizes()">getTransformedSizes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(byte%5B%5D%5B%5D,org.libjpegturbo.turbojpeg.TJTransform%5B%5D)">transform</a></span>&#8203;(byte[][]&nbsp;dstBufs,
<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms)</code></th>
<td class="colLast">
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance into one or more JPEG images stored in the given
destination buffers.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(byte%5B%5D%5B%5D,org.libjpegturbo.turbojpeg.TJTransform%5B%5D,int)">transform</a></span>&#8203;(byte[][]&nbsp;dstBufs,
<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">Use <a href="TJDecompressor.html#set(int,int)"><code>TJDecompressor.set()</code></a> and
<a href="#transform(byte%5B%5D%5B%5D,org.libjpegturbo.turbojpeg.TJTransform%5B%5D)"><code>transform(byte[][], TJTransform[])</code></a> instead.</div>
</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(org.libjpegturbo.turbojpeg.TJTransform%5B%5D)">transform</a></span>&#8203;(<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms)</code></th>
<td class="colLast">
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance and return an array of <a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a>
instances, each of which has a transformed JPEG image associated with it.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(org.libjpegturbo.turbojpeg.TJTransform%5B%5D,int)">transform</a></span>&#8203;(<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">Use <a href="TJDecompressor.html#set(int,int)"><code>TJDecompressor.set()</code></a> and
<a href="#transform(org.libjpegturbo.turbojpeg.TJTransform%5B%5D)"><code>transform(TJTransform[])</code></a> instead.</div>
</div>
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<h3>Methods inherited from class&nbsp;org.libjpegturbo.turbojpeg.<a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a></h3>
<code><a href="TJDecompressor.html#close()">close</a>, <a href="TJDecompressor.html#decompress(byte%5B%5D,int,int,int,int,int,int,int)">decompress</a>, <a href="TJDecompressor.html#decompress(int%5B%5D,int,int,int,int,int,int,int)">decompress</a>, <a href="TJDecompressor.html#decompress(int,int,int,int)">decompress</a>, <a href="TJDecompressor.html#decompress(int,int,int,int,int)">decompress</a>, <a href="TJDecompressor.html#decompress(java.awt.image.BufferedImage,int)">decompress</a>, <a href="TJDecompressor.html#decompress12(int,int)">decompress12</a>, <a href="TJDecompressor.html#decompress12(short%5B%5D,int,int,int,int)">decompress12</a>, <a href="TJDecompressor.html#decompress16(int,int)">decompress16</a>, <a href="TJDecompressor.html#decompress16(short%5B%5D,int,int,int,int)">decompress16</a>, <a href="TJDecompressor.html#decompress8(byte%5B%5D,int,int,int,int)">decompress8</a>, <a href="TJDecompressor.html#decompress8(int)">decompress8</a>, <a href="TJDecompressor.html#decompress8(int%5B%5D,int,int,int,int)">decompress8</a>, <a href="TJDecompressor.html#decompress8(int,int)">decompress8</a>, <a href="TJDecompressor.html#decompress8(java.awt.image.BufferedImage)">decompress8</a>, <a href="TJDecompressor.html#decompressToYUV(int)">decompressToYUV</a>, <a href="TJDecompressor.html#decompressToYUV(int%5B%5D)">decompressToYUV</a>, <a href="TJDecompressor.html#decompressToYUV(int,int%5B%5D,int,int)">decompressToYUV</a>, <a href="TJDecompressor.html#decompressToYUV(int,int,int,int)">decompressToYUV</a>, <a href="TJDecompressor.html#decompressToYUV(org.libjpegturbo.turbojpeg.YUVImage)">decompressToYUV</a>, <a href="TJDecompressor.html#decompressToYUV(org.libjpegturbo.turbojpeg.YUVImage,int)">decompressToYUV</a>, <a href="TJDecompressor.html#finalize()">finalize</a>, <a href="TJDecompressor.html#get(int)">get</a>, <a href="TJDecompressor.html#getColorspace()">getColorspace</a>, <a href="TJDecompressor.html#getHeight()">getHeight</a>, <a href="TJDecompressor.html#getJPEGBuf()">getJPEGBuf</a>, <a href="TJDecompressor.html#getJPEGSize()">getJPEGSize</a>, <a href="TJDecompressor.html#getScaledHeight(int,int)">getScaledHeight</a>, <a href="TJDecompressor.html#getScaledWidth(int,int)">getScaledWidth</a>, <a href="TJDecompressor.html#getSubsamp()">getSubsamp</a>, <a href="TJDecompressor.html#getWidth()">getWidth</a>, <a href="TJDecompressor.html#set(int,int)">set</a>, <a href="TJDecompressor.html#setCroppingRegion(java.awt.Rectangle)">setCroppingRegion</a>, <a href="TJDecompressor.html#setScalingFactor(org.libjpegturbo.turbojpeg.TJScalingFactor)">setScalingFactor</a>, <a href="TJDecompressor.html#setSourceImage(byte%5B%5D,int)">setSourceImage</a>, <a href="TJDecompressor.html#setSourceImage(org.libjpegturbo.turbojpeg.YUVImage)">setSourceImage</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
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</section>
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<h4>TJTransformer</h4>
<pre>public&nbsp;TJTransformer()
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
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<h4>TJTransformer</h4>
<pre>public&nbsp;TJTransformer&#8203;(byte[]&nbsp;jpegImage)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image stored in <code>jpegImage</code> with the newly created
instance.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>jpegImage</code> - buffer containing the JPEG source image to transform.
(The size of the JPEG image is assumed to be the length of the array.)
This buffer is not modified.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
<a id="&lt;init&gt;(byte[],int)">
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</a>
<ul class="blockListLast">
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<h4>TJTransformer</h4>
<pre>public&nbsp;TJTransformer&#8203;(byte[]&nbsp;jpegImage,
int&nbsp;imageSize)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image of length <code>imageSize</code> bytes stored in
<code>jpegImage</code> with the newly created instance.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>jpegImage</code> - buffer containing the JPEG source image to transform.
This buffer is not modified.</dd>
<dd><code>imageSize</code> - size of the JPEG source image (in bytes)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
</li>
</ul>
</section>
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<h3>Method Detail</h3>
<a id="transform(byte[][],org.libjpegturbo.turbojpeg.TJTransform[])">
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<h4>transform</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;transform&#8203;(byte[][]&nbsp;dstBufs,
<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance into one or more JPEG images stored in the given
destination buffers. Lossless transforms work by moving the raw
coefficients from one JPEG image structure to another without altering the
values of the coefficients. While this is typically faster than
decompressing the image, transforming it, and re-compressing it, lossless
transforms are not free. Each lossless transform requires reading and
performing Huffman decoding on all of the coefficients in the source
image, regardless of the size of the destination image. Thus, this method
provides a means of generating multiple transformed images from the same
source or of applying multiple transformations simultaneously, in order to
eliminate the need to read the source coefficients multiple times.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dstBufs</code> - an array of JPEG destination buffers.
<code>dstbufs[i]</code> will receive a JPEG image that has been
transformed using the parameters in <code>transforms[i]</code>. Use
<a href="TJ.html#bufSize(int,int,int)"><code>TJ.bufSize()</code></a> to determine the maximum size for each
buffer based on the transformed or cropped width and height and the level
of subsampling used in the destination image.</dd>
<dd><code>transforms</code> - an array of <a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg"><code>TJTransform</code></a> instances, each of
which specifies the transform parameters and/or cropping region for the
corresponding transformed JPEG image</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
<a id="transform(byte[][],org.libjpegturbo.turbojpeg.TJTransform[],int)">
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<h4>transform</h4>
<pre class="methodSignature">@Deprecated
public&nbsp;void&nbsp;transform&#8203;(byte[][]&nbsp;dstBufs,
<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">Use <a href="TJDecompressor.html#set(int,int)"><code>TJDecompressor.set()</code></a> and
<a href="#transform(byte%5B%5D%5B%5D,org.libjpegturbo.turbojpeg.TJTransform%5B%5D)"><code>transform(byte[][], TJTransform[])</code></a> instead.</div>
</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
<a id="transform(org.libjpegturbo.turbojpeg.TJTransform[])">
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</a>
<ul class="blockList">
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<h4>transform</h4>
<pre class="methodSignature">public&nbsp;<a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]&nbsp;transform&#8203;(<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance and return an array of <a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a>
instances, each of which has a transformed JPEG image associated with it.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>transforms</code> - an array of <a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg"><code>TJTransform</code></a> instances, each of
which specifies the transform parameters and/or cropping region for the
corresponding transformed JPEG image</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array of <a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a> instances, each of
which has a transformed JPEG image associated with it.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
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<h4>transform</h4>
<pre class="methodSignature">@Deprecated
public&nbsp;<a href="TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]&nbsp;transform&#8203;(<a href="TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)
throws <a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
<div class="deprecationComment">Use <a href="TJDecompressor.html#set(int,int)"><code>TJDecompressor.set()</code></a> and
<a href="#transform(org.libjpegturbo.turbojpeg.TJTransform%5B%5D)"><code>transform(TJTransform[])</code></a> instead.</div>
</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd>
</dl>
</li>
</ul>
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<h4>getTransformedSizes</h4>
<pre class="methodSignature">public&nbsp;int[]&nbsp;getTransformedSizes()</pre>
<div class="block">Returns an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</dd>
</dl>
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