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<!DOCTYPE HTML>
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<!-- Generated by javadoc (21) on Tue Nov 11 15:21:53 CST 2025 -->
<title>LuminanceSource (ZXing 3.5.4 API)</title>
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<p>Summary:</p>
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<li>Nested</li>
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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">com.google.zxing</a></div>
<h1 title="Class LuminanceSource" class="title">Class LuminanceSource</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">com.google.zxing.LuminanceSource</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="client/j2se/BufferedImageLuminanceSource.html" title="class in com.google.zxing.client.j2se">BufferedImageLuminanceSource</a></code>, <code><a href="GrayscaleLuminanceSource.html" title="class in com.google.zxing">GrayscaleLuminanceSource</a></code>, <code><a href="InvertedLuminanceSource.html" title="class in com.google.zxing">InvertedLuminanceSource</a></code>, <code><a href="PlanarYUVLuminanceSource.html" title="class in com.google.zxing">PlanarYUVLuminanceSource</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public abstract class </span><span class="element-name type-name-label">LuminanceSource</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">The purpose of this class hierarchy is to abstract different bitmap implementations across
 platforms into a standard interface for requesting greyscale luminance values. The interface
 only provides immutable methods; therefore crop and rotation create copies. This is to ensure
 that one Reader does not modify the original luminance source and leave it in an unknown state
 for other Readers in the chain.</div>
<dl class="notes">
<dt>Author:</dt>
<dd>dswitkin@google.com (Daniel Switkin)</dd>
</dl>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier</div>
<div class="table-header col-second">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>protected </code></div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(int,int)" class="member-name-link">LuminanceSource</a><wbr>(int&nbsp;width,
 int&nbsp;height)</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#crop(int,int,int,int)" class="member-name-link">crop</a><wbr>(int&nbsp;left,
 int&nbsp;top,
 int&nbsp;width,
 int&nbsp;height)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns a new object with cropped image data.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getHeight()" class="member-name-link">getHeight</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>abstract byte[]</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getMatrix()" class="member-name-link">getMatrix</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Fetches luminance data for the underlying bitmap.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>abstract byte[]</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getRow(int,byte%5B%5D)" class="member-name-link">getRow</a><wbr>(int&nbsp;y,
 byte[]&nbsp;row)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Fetches one row of luminance data from the underlying platform's bitmap.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final int</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getWidth()" class="member-name-link">getWidth</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#invert()" class="member-name-link">invert</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isCropSupported()" class="member-name-link">isCropSupported</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isRotateSupported()" class="member-name-link">isRotateSupported</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#rotateCounterClockwise()" class="member-name-link">rotateCounterClockwise</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns a new object with rotated image data by 90 degrees counterclockwise.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#rotateCounterClockwise45()" class="member-name-link">rotateCounterClockwise45</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns a new object with rotated image data by 45 degrees counterclockwise.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#toString()" class="member-name-link">toString</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;(int,int)">
<h3>LuminanceSource</h3>
<div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="element-name">LuminanceSource</span><wbr><span class="parameters">(int&nbsp;width,
 int&nbsp;height)</span></div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="getRow(int,byte[])">
<h3>getRow</h3>
<div class="member-signature"><span class="modifiers">public abstract</span>&nbsp;<span class="return-type">byte[]</span>&nbsp;<span class="element-name">getRow</span><wbr><span class="parameters">(int&nbsp;y,
 byte[]&nbsp;row)</span></div>
<div class="block">Fetches one row of luminance data from the underlying platform's bitmap. Values range from
 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
 to bitwise and with 0xff for each value. It is preferable for implementations of this method
 to only fetch this row rather than the whole image, since no 2D Readers may be installed and
 getMatrix() may never be called.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>y</code> - The row to fetch, which must be in [0,getHeight())</dd>
<dd><code>row</code> - An optional preallocated array. If null or too small, it will be ignored.
            Always use the returned object, and ignore the .length of the array.</dd>
<dt>Returns:</dt>
<dd>An array containing the luminance data.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getMatrix()">
<h3>getMatrix</h3>
<div class="member-signature"><span class="modifiers">public abstract</span>&nbsp;<span class="return-type">byte[]</span>&nbsp;<span class="element-name">getMatrix</span>()</div>
<div class="block">Fetches luminance data for the underlying bitmap. Values should be fetched using:
 <code>int luminance = array[y * width + x] &amp; 0xff</code></div>
<dl class="notes">
<dt>Returns:</dt>
<dd>A row-major 2D array of luminance values. Do not use result.length as it may be
         larger than width * height bytes on some platforms. Do not modify the contents
         of the result.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getWidth()">
<h3>getWidth</h3>
<div class="member-signature"><span class="modifiers">public final</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">getWidth</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>The width of the bitmap.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getHeight()">
<h3>getHeight</h3>
<div class="member-signature"><span class="modifiers">public final</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">getHeight</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>The height of the bitmap.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isCropSupported()">
<h3>isCropSupported</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isCropSupported</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>Whether this subclass supports cropping.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="crop(int,int,int,int)">
<h3>crop</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span>&nbsp;<span class="element-name">crop</span><wbr><span class="parameters">(int&nbsp;left,
 int&nbsp;top,
 int&nbsp;width,
 int&nbsp;height)</span></div>
<div class="block">Returns a new object with cropped image data. Implementations may keep a reference to the
 original data rather than a copy. Only callable if isCropSupported() is true.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>left</code> - The left coordinate, which must be in [0,getWidth())</dd>
<dd><code>top</code> - The top coordinate, which must be in [0,getHeight())</dd>
<dd><code>width</code> - The width of the rectangle to crop.</dd>
<dd><code>height</code> - The height of the rectangle to crop.</dd>
<dt>Returns:</dt>
<dd>A cropped version of this object.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isRotateSupported()">
<h3>isRotateSupported</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isRotateSupported</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>Whether this subclass supports counter-clockwise rotation.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="invert()">
<h3>invert</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span>&nbsp;<span class="element-name">invert</span>()</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>a wrapper of this <code>LuminanceSource</code> which inverts the luminances it returns -- black becomes
  white and vice versa, and each value becomes (255-value).</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="rotateCounterClockwise()">
<h3>rotateCounterClockwise</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span>&nbsp;<span class="element-name">rotateCounterClockwise</span>()</div>
<div class="block">Returns a new object with rotated image data by 90 degrees counterclockwise.
 Only callable if <a href="#isRotateSupported()"><code>isRotateSupported()</code></a> is true.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>A rotated version of this object.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="rotateCounterClockwise45()">
<h3>rotateCounterClockwise45</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span>&nbsp;<span class="element-name">rotateCounterClockwise45</span>()</div>
<div class="block">Returns a new object with rotated image data by 45 degrees counterclockwise.
 Only callable if <a href="#isRotateSupported()"><code>isRotateSupported()</code></a> is true.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>A rotated version of this object.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="toString()">
<h3>toString</h3>
<div class="member-signature"><span class="modifiers">public final</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">toString</span>()</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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