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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Add the asynchronous image decoding mode"
href="https://bugs.webkit.org/show_bug.cgi?id=155546">155546</a>
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<th>Summary</th>
<td>Add the asynchronous image decoding mode
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Images
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>sabouhallawa@apple.com
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<pre>In case of large images, the image decoding will start immediately after having the size of the image. A new class named ImageFrameDecoder which inherits form ImageDecoder will be added to manage the fork. In ImageFrameDecoder:: setData() and after knowing the size of the image is available, a heretic will be checked to decide whether to an asynchronous image decoding is needed or not. If it is needed, a separate thread will be created to do the decoding such that the main thread is not blocked. In the main thread side, ImageSource::frameAtIndex() will check whether the ImageDecoder is in asynchronous decoding mode or not. If it is, no caching will be carried out on the main thread. ImageSource::frameAtIndex(), will return whatever is stored in the ImageFraeDataBuffer[index] regardless whether it is complete or not.</pre>
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