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    <p>As @hackbod mentioned <code>BitmapRegionDecoder</code> is based on external <code>skia</code> library. Yet it's may be a benefit.</p> <p>Let's examine original source:</p> <ul> <li><p><code>BitmapRegionDecoder.java</code>. Mostly defines wrappers around native methods:</p> <pre><code>private static native Bitmap nativeDecodeRegion(int lbm, int start_x, int start_y, int width, int height, BitmapFactory.Options options); private static native int nativeGetWidth(int lbm); private static native int nativeGetHeight(int lbm); private static native void nativeClean(int lbm); // ...multiply nativeNewInstance overloads follow </code></pre> <p>Class doesn't use any new Java APIs we'd need to backport.</p></li> <li><p><code>BitmapRegionDecoder.cpp</code>. Header files it includes consist of ones which are present in <code>Froyo</code> except these two:</p> <ul> <li><p><code>AutoDecodeCancel.h</code>. The only line it's used in:</p> <pre><code>AutoDecoderCancel adc(options, decoder); </code></pre> <p>This class handles <code>SkDecoder</code> instances lifecycle. It's a small piece of code and may be well back-ported.</p></li> <li><p><code>SkBitmapRegionDecoder.h</code></p> <p>As filename states this is a core component. In fact, all previous were a kind of wrappers around it. The good news is that we may not need to back-port it as it should be possible to take a whole <code>skia</code> library from the <code>Gingerbeard</code> and compile it under <code>Froyo</code> as it is external and doesn't contain any new dependencies.</p></li> </ul></li> </ul> <p>P.S. I didn't actually dive deep in the code so please correct me if there's anything I overlooked.</p> <h3>Update:</h3> <p>Source code we need is located in following repositories on branches <code>froyo-release</code> and <code>gingerbread-mr4-release</code>:</p> <ul> <li><a href="https://github.com/android/platform_external_skia" rel="noreferrer">External skia library repository</a> <ul> <li>Header files are in <code>include/core</code> and <code>include/images</code></li> </ul></li> <li><a href="https://github.com/android/platform_frameworks_base" rel="noreferrer">Android framework base</a> <ul> <li>Java code: <code>graphics/java/android/graphics/BitmapRegionDecoder.java</code></li> <li>Native code: <code>core/jni/android/graphics/...</code></li> </ul></li> </ul>
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    1. POHow can I use BitmapRegionDecoder code in android 2.2.2 (Froyo)?
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    1. USAndrey Ermakov
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    1. POHow can I use BitmapRegionDecoder code in android 2.2.2 (Froyo)?
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    1. COThanks for the optimism! Which is the "authoritative" git repository? I want to experiment with this and document my results here for the benefit of others.
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    2. COAll the code can be found at https://github.com/android. It's also convenient to use http://androidxref.com/source/ for search. I'll try to do it myself also.
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    3. COSorry for the "noob" questions, but which repository would it be under in that list? Should I be cloning more than one of them?
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