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<h2 title="Class SkiaPooledImageRegionDecoder" class="title">Class SkiaPooledImageRegionDecoder</h2>
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<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>
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<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.
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#SkiaPooledImageRegionDecoder--">SkiaPooledImageRegionDecoder</a></span>()</code> </td>
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<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> bitmapConfig)</code> </td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<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 numberOfDecoders,
long 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> sRect,
int 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> context,
<a href="https://developer.android.com/reference/android/net/Uri.html?is-external=true" title="class or interface in android.net">Uri</a> uri)</code>
<div class="block">Initialises the decoder pool.</div>
</td>
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<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>
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<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 debug)</code>
<div class="block">Controls logging of debug messages.</div>
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<h4>SkiaPooledImageRegionDecoder</h4>
<pre>public SkiaPooledImageRegionDecoder()</pre>
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<h4>SkiaPooledImageRegionDecoder</h4>
<pre>public 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> bitmapConfig)</pre>
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<h4>setDebug</h4>
<pre>public static void setDebug(boolean 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>
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<h4>init</h4>
<pre>public <a href="https://developer.android.com/reference/android/graphics/Point.html?is-external=true" title="class or interface in android.graphics">Point</a> init(<a href="https://developer.android.com/reference/android/content/Context.html?is-external=true" title="class or interface in android.content">Context</a> context,
<a href="https://developer.android.com/reference/android/net/Uri.html?is-external=true" title="class or interface in android.net">Uri</a> 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> in interface <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>
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<h4>decodeRegion</h4>
<pre>public <a href="https://developer.android.com/reference/android/graphics/Bitmap.html?is-external=true" title="class or interface in android.graphics">Bitmap</a> decodeRegion(<a href="https://developer.android.com/reference/android/graphics/Rect.html?is-external=true" title="class or interface in android.graphics">Rect</a> sRect,
int 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> in interface <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>
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<pre>public boolean 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> in interface <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>
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<h4>recycle</h4>
<pre>public void 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> in interface <code><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/ImageRegionDecoder.html" title="interface in com.davemorrissey.labs.subscaleview.decoder">ImageRegionDecoder</a></code></dd>
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<h4>allowAdditionalDecoder</h4>
<pre>protected boolean allowAdditionalDecoder(int numberOfDecoders,
long 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>
<dd>true if another decoder can be created.</dd>
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