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<!DOCTYPE HTML>
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<title>GrayscaleLuminanceSource (ZXing 3.5.4 API)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.google.zxing</a></div>
<h1 title="Class GrayscaleLuminanceSource" class="title">Class GrayscaleLuminanceSource</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"><a href="LuminanceSource.html" title="class in com.google.zxing">com.google.zxing.LuminanceSource</a>
<div class="inheritance">com.google.zxing.GrayscaleLuminanceSource</div>
</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="RGBLuminanceSource.html" title="class in com.google.zxing">RGBLuminanceSource</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">GrayscaleLuminanceSource</span>
<span class="extends-implements">extends <a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span></div>
<div class="block">This class is used to help decode images from files which arrive as a grayscale
pixel array.</div>
<dl class="notes">
<dt>Author:</dt>
<dd>dswitkin@google.com (Daniel Switkin), Betaminos</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 two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(int,int,byte%5B%5D)" class="member-name-link">GrayscaleLuminanceSource</a><wbr>(int width,
int height,
byte[] pixels)</code></div>
<div class="col-last even-row-color"> </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-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 left,
int top,
int width,
int 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>byte[]</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getMatrix()" class="member-name-link">getMatrix</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Fetches luminance data for the underlying bitmap.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>byte[]</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getRow(int,byte%5B%5D)" class="member-name-link">getRow</a><wbr>(int y,
byte[] row)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Fetches one row of luminance data from the underlying platform's bitmap.</div>
</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="#isCropSupported()" class="member-name-link">isCropSupported</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </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="#isRotateSupported()" class="member-name-link">isRotateSupported</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </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="#rotateCounterClockwise()" class="member-name-link">rotateCounterClockwise</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 90 degrees counterclockwise.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-com.google.zxing.LuminanceSource">Methods inherited from class com.google.zxing.<a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></h3>
<code><a href="LuminanceSource.html#getHeight()">getHeight</a>, <a href="LuminanceSource.html#getWidth()">getWidth</a>, <a href="LuminanceSource.html#invert()">invert</a>, <a href="LuminanceSource.html#rotateCounterClockwise45()">rotateCounterClockwise45</a>, <a href="LuminanceSource.html#toString()">toString</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class 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="<init>(int,int,byte[])">
<h3>GrayscaleLuminanceSource</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="element-name">GrayscaleLuminanceSource</span><wbr><span class="parameters">(int width,
int height,
byte[] pixels)</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</span> <span class="return-type">byte[]</span> <span class="element-name">getRow</span><wbr><span class="parameters">(int y,
byte[] row)</span></div>
<div class="block"><span class="description-from-type-label">Description copied from class: <code><a href="LuminanceSource.html#getRow(int,byte%5B%5D)">LuminanceSource</a></code></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>Specified by:</dt>
<dd><code><a href="LuminanceSource.html#getRow(int,byte%5B%5D)">getRow</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<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</span> <span class="return-type">byte[]</span> <span class="element-name">getMatrix</span>()</div>
<div class="block"><span class="description-from-type-label">Description copied from class: <code><a href="LuminanceSource.html#getMatrix()">LuminanceSource</a></code></span></div>
<div class="block">Fetches luminance data for the underlying bitmap. Values should be fetched using:
<code>int luminance = array[y * width + x] & 0xff</code></div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="LuminanceSource.html#getMatrix()">getMatrix</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<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="isCropSupported()">
<h3>isCropSupported</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name">isCropSupported</span>()</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="LuminanceSource.html#isCropSupported()">isCropSupported</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<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> <span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span> <span class="element-name">crop</span><wbr><span class="parameters">(int left,
int top,
int width,
int height)</span></div>
<div class="block"><span class="description-from-type-label">Description copied from class: <code><a href="LuminanceSource.html#crop(int,int,int,int)">LuminanceSource</a></code></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>Overrides:</dt>
<dd><code><a href="LuminanceSource.html#crop(int,int,int,int)">crop</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<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> <span class="return-type">boolean</span> <span class="element-name">isRotateSupported</span>()</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="LuminanceSource.html#isRotateSupported()">isRotateSupported</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<dt>Returns:</dt>
<dd>Whether this subclass supports counter-clockwise rotation.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="rotateCounterClockwise()">
<h3>rotateCounterClockwise</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span> <span class="element-name">rotateCounterClockwise</span>()</div>
<div class="block"><span class="description-from-type-label">Description copied from class: <code><a href="LuminanceSource.html#rotateCounterClockwise()">LuminanceSource</a></code></span></div>
<div class="block">Returns a new object with rotated image data by 90 degrees counterclockwise.
Only callable if <a href="LuminanceSource.html#isRotateSupported()"><code>LuminanceSource.isRotateSupported()</code></a> is true.</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="LuminanceSource.html#rotateCounterClockwise()">rotateCounterClockwise</a></code> in class <code><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></dd>
<dt>Returns:</dt>
<dd>A rotated version of this object.</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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