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+<div class="subTitle">com.davemorrissey.labs.subscaleview.decoder</div>
+<h2 title="Class SkiaPooledImageRegionDecoder" class="title">Class SkiaPooledImageRegionDecoder</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>com.davemorrissey.labs.subscaleview.decoder.SkiaPooledImageRegionDecoder</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">SkiaPooledImageRegionDecoder</span>
+extends <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
+implements <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></pre>
+<div class="block"><p>
+ An implementation of <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder"><code>ImageRegionDecoder</code></a> using a pool of <a href="https://developer.android.com/reference/android/graphics/BitmapRegionDecoder.html?is-external=true" title="class or interface in android.graphics"><code>BitmapRegionDecoder</code></a>s,
+ to provide true parallel loading of tiles. This is only effective if parallel loading has been
+ enabled in the view by calling <a href="../../../../../com/davemorrissey/labs/subscaleview/SubsamplingScaleImageView.html#setExecutor-java.util.concurrent.Executor-"><code>SubsamplingScaleImageView.setExecutor(Executor)</code></a>
+ with a multi-threaded <a href="https://developer.android.com/reference/java/util/concurrent/Executor.html?is-external=true" title="class or interface in java.util.concurrent"><code>Executor</code></a> instance.
+ </p><p>
+ One decoder is initialised when the class is initialised. This is enough to decode base layer tiles.
+ Additional decoders are initialised when a subregion of the image is first requested, which indicates
+ interaction with the view. Creation of additional encoders stops when <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#allowAdditionalDecoder-int-long-"><code>allowAdditionalDecoder(int, long)</code></a>
+ returns false. The default implementation takes into account the file size, number of CPU cores,
+ low memory status and a hard limit of 4. Extend this class to customise this.
+ </p><p>
+ <b>WARNING:</b> This class is highly experimental and not proven to be stable on a wide range of
+ devices. You are advised to test it thoroughly on all available devices, and code your app to use
+ <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaImageRegionDecoder.html" title="class in com.davemorrissey.labs.subscaleview.decoder"><code>SkiaImageRegionDecoder</code></a> on old or low powered devices you could not test.
+ </p></div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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+<li class="blockList"><a name="constructor.summary">
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+</a>
+<h3>Constructor Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#SkiaPooledImageRegionDecoder--">SkiaPooledImageRegionDecoder</a></span>()</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#SkiaPooledImageRegionDecoder-android.graphics.Bitmap.Config-">SkiaPooledImageRegionDecoder</a></span>(<a href="https://developer.android.com/reference/android/graphics/Bitmap.Config.html?is-external=true" title="class or interface in android.graphics">Bitmap.Config</a>&nbsp;bitmapConfig)</code>&nbsp;</td>
+</tr>
+</table>
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+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#allowAdditionalDecoder-int-long-">allowAdditionalDecoder</a></span>(int&nbsp;numberOfDecoders,
+ long&nbsp;fileLength)</code>
+<div class="block">Called before creating a new decoder.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code><a href="https://developer.android.com/reference/android/graphics/Bitmap.html?is-external=true" title="class or interface in android.graphics">Bitmap</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#decodeRegion-android.graphics.Rect-int-">decodeRegion</a></span>(<a href="https://developer.android.com/reference/android/graphics/Rect.html?is-external=true" title="class or interface in android.graphics">Rect</a>&nbsp;sRect,
+ int&nbsp;sampleSize)</code>
+<div class="block">Acquire a read lock to prevent decoding overlapping with recycling, then check the pool still
+ exists and acquire a decoder to load the requested region.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code><a href="https://developer.android.com/reference/android/graphics/Point.html?is-external=true" title="class or interface in android.graphics">Point</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#init-android.content.Context-android.net.Uri-">init</a></span>(<a href="https://developer.android.com/reference/android/content/Context.html?is-external=true" title="class or interface in android.content">Context</a>&nbsp;context,
+ <a href="https://developer.android.com/reference/android/net/Uri.html?is-external=true" title="class or interface in android.net">Uri</a>&nbsp;uri)</code>
+<div class="block">Initialises the decoder pool.</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#isReady--">isReady</a></span>()</code>
+<div class="block">Holding a read lock to avoid returning true while the pool is being recycled, this returns
+ true if the pool has at least one decoder available.</div>
+</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#recycle--">recycle</a></span>()</code>
+<div class="block">Wait until all read locks held by <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#decodeRegion-android.graphics.Rect-int-"><code>decodeRegion(Rect, int)</code></a> are released, then recycle
+ and destroy the pool.</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>static void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#setDebug-boolean-">setDebug</a></span>(boolean&nbsp;debug)</code>
+<div class="block">Controls logging of debug messages.</div>
+</td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;java.lang.<a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
+<code><a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========= CONSTRUCTOR DETAIL ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.detail">
+<!-- -->
+</a>
+<h3>Constructor Detail</h3>
+<a name="SkiaPooledImageRegionDecoder--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>SkiaPooledImageRegionDecoder</h4>
+<pre>public&nbsp;SkiaPooledImageRegionDecoder()</pre>
+</li>
+</ul>
+<a name="SkiaPooledImageRegionDecoder-android.graphics.Bitmap.Config-">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>SkiaPooledImageRegionDecoder</h4>
+<pre>public&nbsp;SkiaPooledImageRegionDecoder(<a href="https://developer.android.com/reference/android/graphics/Bitmap.Config.html?is-external=true" title="class or interface in android.graphics">Bitmap.Config</a>&nbsp;bitmapConfig)</pre>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
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+<h3>Method Detail</h3>
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+<ul class="blockList">
+<li class="blockList">
+<h4>setDebug</h4>
+<pre>public static&nbsp;void&nbsp;setDebug(boolean&nbsp;debug)</pre>
+<div class="block">Controls logging of debug messages. All instances are affected.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>debug</code> - true to enable debug logging, false to disable.</dd>
+</dl>
+</li>
+</ul>
+<a name="init-android.content.Context-android.net.Uri-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>init</h4>
+<pre>public&nbsp;<a href="https://developer.android.com/reference/android/graphics/Point.html?is-external=true" title="class or interface in android.graphics">Point</a>&nbsp;init(<a href="https://developer.android.com/reference/android/content/Context.html?is-external=true" title="class or interface in android.content">Context</a>&nbsp;context,
+ <a href="https://developer.android.com/reference/android/net/Uri.html?is-external=true" title="class or interface in android.net">Uri</a>&nbsp;uri)
+ throws <a href="https://developer.android.com/reference/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Initialises the decoder pool. This method creates one decoder on the current thread and uses
+ it to decode the bounds, then spawns an independent thread to populate the pool with an
+ additional three decoders. The thread will abort if <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#recycle--"><code>recycle()</code></a> is called.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html#init-android.content.Context-android.net.Uri-">init</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>context</code> - Application context. A reference may be held, but must be cleared on recycle.</dd>
+<dd><code>uri</code> - URI of the image.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>Dimensions of the image.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://developer.android.com/reference/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if initialisation fails.</dd>
+</dl>
+</li>
+</ul>
+<a name="decodeRegion-android.graphics.Rect-int-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>decodeRegion</h4>
+<pre>public&nbsp;<a href="https://developer.android.com/reference/android/graphics/Bitmap.html?is-external=true" title="class or interface in android.graphics">Bitmap</a>&nbsp;decodeRegion(<a href="https://developer.android.com/reference/android/graphics/Rect.html?is-external=true" title="class or interface in android.graphics">Rect</a>&nbsp;sRect,
+ int&nbsp;sampleSize)</pre>
+<div class="block">Acquire a read lock to prevent decoding overlapping with recycling, then check the pool still
+ exists and acquire a decoder to load the requested region. There is no check whether the pool
+ currently has decoders, because it's guaranteed to have one decoder after <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#init-android.content.Context-android.net.Uri-"><code>init(Context, Uri)</code></a>
+ is called and be null once <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#recycle--"><code>recycle()</code></a> is called. In practice the view can't call this
+ method until after <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#init-android.content.Context-android.net.Uri-"><code>init(Context, Uri)</code></a>, so there will be no blocking on an empty pool.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html#decodeRegion-android.graphics.Rect-int-">decodeRegion</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sRect</code> - Source image rectangle to decode.</dd>
+<dd><code>sampleSize</code> - Sample size.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>The decoded region. It is safe to return null if decoding fails.</dd>
+</dl>
+</li>
+</ul>
+<a name="isReady--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>isReady</h4>
+<pre>public&nbsp;boolean&nbsp;isReady()</pre>
+<div class="block">Holding a read lock to avoid returning true while the pool is being recycled, this returns
+ true if the pool has at least one decoder available.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html#isReady--">isReady</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></code></dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>true if the decoder is ready to be used.</dd>
+</dl>
+</li>
+</ul>
+<a name="recycle--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>recycle</h4>
+<pre>public&nbsp;void&nbsp;recycle()</pre>
+<div class="block">Wait until all read locks held by <a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#decodeRegion-android.graphics.Rect-int-"><code>decodeRegion(Rect, int)</code></a> are released, then recycle
+ and destroy the pool. Elsewhere, when a read lock is acquired, we must check the pool is not null.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html#recycle--">recycle</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></code></dd>
+</dl>
+</li>
+</ul>
+<a name="allowAdditionalDecoder-int-long-">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>allowAdditionalDecoder</h4>
+<pre>protected&nbsp;boolean&nbsp;allowAdditionalDecoder(int&nbsp;numberOfDecoders,
+ long&nbsp;fileLength)</pre>
+<div class="block">Called before creating a new decoder. Based on number of CPU cores, available memory, and the
+ size of the image file, determines whether another decoder can be created. Subclasses can
+ override and customise this.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>numberOfDecoders</code> - the number of decoders that have been created so far</dd>
+<dd><code>fileLength</code> - the size of the image file in bytes. Creating another decoder will use approximately this much native memory.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
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