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| <div class="subTitle">com.davemorrissey.labs.subscaleview.decoder</div> |
| <h2 title="Class SkiaPooledImageRegionDecoder" class="title">Class SkiaPooledImageRegionDecoder</h2> |
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| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>com.davemorrissey.labs.subscaleview.decoder.SkiaPooledImageRegionDecoder</li> |
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| <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> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/davemorrissey/labs/subscaleview/decoder/SkiaPooledImageRegionDecoder.html#SkiaPooledImageRegionDecoder--">SkiaPooledImageRegionDecoder</a></span>()</code> </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> bitmapConfig)</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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 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> |
| </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 debug)</code> |
| <div class="block">Controls logging of debug messages.</div> |
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| </ul> |
| </li> |
| </ul> |
| </li> |
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| </div> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="SkiaPooledImageRegionDecoder--"> |
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| </a> |
| <ul class="blockList"> |
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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> |
| </li> |
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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> |
| </dl> |
| </li> |
| </ul> |
| <a name="init-android.content.Context-android.net.Uri-"> |
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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> |
| </dl> |
| </li> |
| </ul> |
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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> |
| </li> |
| </ul> |
| <a name="isReady--"> |
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| </a> |
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| <h4>isReady</h4> |
| <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> |
| </li> |
| </ul> |
| <a name="recycle--"> |
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| </a> |
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| <li class="blockList"> |
| <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> |
| </dl> |
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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> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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