git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1184 632fc199-4ca6-4c93-a231-07263d6284db
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570 lines
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<div class="subTitle">org.libjpegturbo.turbojpeg</div>
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<h2 title="Class YUVImage" class="title">Class YUVImage</h2>
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</div>
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<div class="contentContainer">
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>
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<ul class="inheritance">
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<li>org.libjpegturbo.turbojpeg.YUVImage</li>
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</ul>
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<pre>public class <span class="strong">YUVImage</span>
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extends java.lang.Object</pre>
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<div class="block">This class encapsulates a YUV planar image buffer and the metadata
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associated with it. The TurboJPEG API allows both the JPEG compression and
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decompression pipelines to be split into stages: YUV encode, compress from
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YUV, decompress to YUV, and YUV decode. A <code>YUVImage</code> instance
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serves as the destination image for YUV encode and decompress-to-YUV
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operations and as the source image for compress-from-YUV and YUV decode
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operations.
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<p>
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Technically, the JPEG format uses the YCbCr colorspace (which technically is
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not a "colorspace" but rather a "color transform"), but per the convention
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of the digital video community, the TurboJPEG API uses "YUV" to refer to an
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image format consisting of Y, Cb, and Cr image planes. In this image
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format, the Y, Cb (U), and Cr (V) planes are stored sequentially in the same
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image buffer, and the size of each plane is determined by the image width,
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height, line padding, and level of chrominance subsampling. If the
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chrominance components are subsampled along the horizontal dimension, then
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the width of the luminance plane would be padded to the nearest multiple of
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2 (same goes for the height of the luminance plane, if the chrominance
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components are subsampled along the vertical dimension.) For instance, if
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the source image is 35 x 35 pixels and 4:2:2 subsampling is used, then the
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luminance plane would be 36 x 35 bytes, and each of the chrominance planes
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would be 18 x 35 bytes. If you specify, for instance, a line padding of 4
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bytes on top of this, then the luminance plane would be 36 x 35 bytes, and
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each of the chrominance planes would be 20 x 35 bytes.</div>
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</li>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
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<td class="colFirst"><code>protected long</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#handle">handle</a></strong></code> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#yuvBuf">yuvBuf</a></strong></code> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#yuvHeight">yuvHeight</a></strong></code> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#yuvPad">yuvPad</a></strong></code> </td>
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#yuvSubsamp">yuvSubsamp</a></strong></code> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#yuvWidth">yuvWidth</a></strong></code> </td>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#YUVImage(byte[], int, int, int, int)">YUVImage</a></strong>(byte[] yuvImage,
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int width,
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int pad,
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int height,
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int subsamp)</code>
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<div class="block">Create a <code>YUVImage</code> instance from an existing YUV planar image
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buffer.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#YUVImage(int, int, int, int)">YUVImage</a></strong>(int width,
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int pad,
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int height,
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int subsamp)</code>
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<div class="block">Create a <code>YUVImage</code> instance with a new image buffer.</div>
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</td>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>byte[]</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getBuf()">getBuf</a></strong>()</code>
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<div class="block">Returns the YUV image buffer</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getHeight()">getHeight</a></strong>()</code>
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<div class="block">Returns the height of the YUV image.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getPad()">getPad</a></strong>()</code>
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<div class="block">Returns the line padding used in the YUV image buffer.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getSize()">getSize</a></strong>()</code>
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<div class="block">Returns the size (in bytes) of the YUV image buffer</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getSubsamp()">getSubsamp</a></strong>()</code>
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<div class="block">Returns the level of chrominance subsampling used in the YUV image.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#getWidth()">getWidth</a></strong>()</code>
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<div class="block">Returns the width of the YUV image.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html#setBuf(byte[], int, int, int, int)">setBuf</a></strong>(byte[] yuvImage,
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int width,
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int pad,
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int height,
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int subsamp)</code>
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<div class="block">Assign an existing YUV planar image buffer to this <code>YUVImage</code>
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instance.</div>
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</td>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<a name="handle">
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<h4>handle</h4>
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<pre>protected long handle</pre>
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<a name="yuvBuf">
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<h4>yuvBuf</h4>
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<pre>protected byte[] yuvBuf</pre>
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<a name="yuvPad">
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<h4>yuvPad</h4>
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<pre>protected int yuvPad</pre>
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<h4>yuvWidth</h4>
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<pre>protected int yuvWidth</pre>
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<h4>yuvHeight</h4>
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<pre>protected int yuvHeight</pre>
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<h4>yuvSubsamp</h4>
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<pre>protected int yuvSubsamp</pre>
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<h3>Constructor Detail</h3>
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<h4>YUVImage</h4>
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<pre>public YUVImage(int width,
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int pad,
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int height,
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int subsamp)
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throws java.lang.Exception</pre>
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<div class="block">Create a <code>YUVImage</code> instance with a new image buffer.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>width</code> - width (in pixels) of the YUV image</dd><dd><code>pad</code> - Each line of each plane in the YUV image buffer will be padded
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to this number of bytes (must be a power of 2.)</dd><dd><code>height</code> - height (in pixels) of the YUV image</dd><dd><code>subsamp</code> - the level of chrominance subsampling to be used in the YUV
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image (one of <a href="../../../org/libjpegturbo/turbojpeg/TJ.html#SAMP_444"><code>TJ.SAMP_*</code></a>)</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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<h4>YUVImage</h4>
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<pre>public YUVImage(byte[] yuvImage,
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int width,
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int pad,
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int height,
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int subsamp)
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throws java.lang.Exception</pre>
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<div class="block">Create a <code>YUVImage</code> instance from an existing YUV planar image
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buffer.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>yuvImage</code> - image buffer that contains or will contain YUV planar
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image data. See <a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html" title="class in org.libjpegturbo.turbojpeg"><code>above</code></a> for a description of the image
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format. Use <a href="../../../org/libjpegturbo/turbojpeg/TJ.html#bufSizeYUV(int, int, int, int)"><code>TJ.bufSizeYUV(int, int, int, int)</code></a> to determine the minimum size for this
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buffer.</dd><dd><code>width</code> - width (in pixels) of the YUV image</dd><dd><code>pad</code> - the line padding used in the YUV image buffer. For
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instance, if each line in each plane of the buffer is padded to the
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nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.</dd><dd><code>height</code> - height (in pixels) of the YUV image</dd><dd><code>subsamp</code> - the level of chrominance subsampling used in the YUV
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image (one of <a href="../../../org/libjpegturbo/turbojpeg/TJ.html#SAMP_444"><code>TJ.SAMP_*</code></a>)</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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<h4>setBuf</h4>
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<pre>public void setBuf(byte[] yuvImage,
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int width,
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int pad,
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int height,
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int subsamp)
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throws java.lang.Exception</pre>
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<div class="block">Assign an existing YUV planar image buffer to this <code>YUVImage</code>
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instance.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>yuvImage</code> - image buffer that contains or will contain YUV planar
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image data. See <a href="../../../org/libjpegturbo/turbojpeg/YUVImage.html" title="class in org.libjpegturbo.turbojpeg"><code>above</code></a> for a description of the image
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format. Use <a href="../../../org/libjpegturbo/turbojpeg/TJ.html#bufSizeYUV(int, int, int, int)"><code>TJ.bufSizeYUV(int, int, int, int)</code></a> to determine the minimum size for this
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buffer.</dd><dd><code>width</code> - width (in pixels) of the YUV image</dd><dd><code>pad</code> - the line padding used in the YUV image buffer. For
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instance, if each line in each plane of the buffer is padded to the
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nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.</dd><dd><code>height</code> - height (in pixels) of the YUV image</dd><dd><code>subsamp</code> - the level of chrominance subsampling used in the YUV
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image (one of <a href="../../../org/libjpegturbo/turbojpeg/TJ.html#SAMP_444"><code>TJ.SAMP_*</code></a>)</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getWidth()">
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</a>
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<h4>getWidth</h4>
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<pre>public int getWidth()
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throws java.lang.Exception</pre>
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<div class="block">Returns the width of the YUV image.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>the width of the YUV image</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getHeight()">
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</a>
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<h4>getHeight</h4>
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<pre>public int getHeight()
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throws java.lang.Exception</pre>
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<div class="block">Returns the height of the YUV image.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>the height of the YUV image</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getPad()">
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</a>
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<ul class="blockList">
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<li class="blockList">
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<h4>getPad</h4>
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<pre>public int getPad()
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throws java.lang.Exception</pre>
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<div class="block">Returns the line padding used in the YUV image buffer.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>the line padding used in the YUV image buffer</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getSubsamp()">
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</a>
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<ul class="blockList">
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<h4>getSubsamp</h4>
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<pre>public int getSubsamp()
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throws java.lang.Exception</pre>
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<div class="block">Returns the level of chrominance subsampling used in the YUV image. See
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|
<a href="../../../org/libjpegturbo/turbojpeg/TJ.html#SAMP_444"><code>TJ.SAMP_*</code></a>.</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>the level of chrominance subsampling used in the YUV image</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getBuf()">
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</a>
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<h4>getBuf</h4>
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<pre>public byte[] getBuf()
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throws java.lang.Exception</pre>
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<div class="block">Returns the YUV image buffer</div>
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<dl><dt><span class="strong">Returns:</span></dt><dd>the YUV image buffer</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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</li>
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</ul>
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<a name="getSize()">
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<h4>getSize</h4>
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<pre>public int getSize()
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throws java.lang.Exception</pre>
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<div class="block">Returns the size (in bytes) of the YUV image buffer</div>
|
|
<dl><dt><span class="strong">Returns:</span></dt><dd>the size (in bytes) of the YUV image buffer</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd></dl>
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