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<!DOCTYPE html>
<html lang="en">
<head>
<title>CBLImageManipulationHelpers Class Reference</title>
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<a name="//apple_ref/objc/Class/CBLImageManipulationHelpers" class="dashAnchor"></a>
<a title="CBLImageManipulationHelpers Class Reference"></a>
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<div class="content-wrapper">
<p>
<a href="../index.html">CascableCore Docs</a>
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CBLImageManipulationHelpers Class Reference
</span>
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</div>
</div>
<div class="wrapper">
<div class="article-wrapper">
<article class="main-content">
<section>
<section class="section">
<h1>CBLImageManipulationHelpers</h1>
<div class="declaration">
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight objective_c"><code>
<span class="k">@interface</span> <span class="nc">CBLImageManipulationHelpers</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ImageManipulationHelpers</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
<p>Helper class for working with image data.</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)CBLImageManipulationHelpers(cm)imageDataByRotatingImageData:forRotation:"></a>
<a name="//apple_ref/objc/Method/+imageDataByRotatingImageData:forRotation:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)CBLImageManipulationHelpers(cm)imageDataByRotatingImageData:forRotation:">+imageDataByRotatingImageData:<wbr>forRotation:<wbr></a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Rotates an image to orient it based on the given EXIF rotation value.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight objective_c"><code><span class="k">+</span> <span class="p">(</span><span class="n">nullable</span> <span class="n">NSData</span> <span class="o">*</span><span class="p">)</span><span class="nf">imageDataByRotatingImageData</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">NSData</span> <span class="o">*</span><span class="p">)</span><span class="nv">sourceData</span>
<span class="nf">forRotation</span><span class="p">:(</span><span class="n"><a href="../Enums/CBLExifRotation.html">CBLExifRotation</a></span><span class="p">)</span><span class="nv">rotation</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kd">func</span> <span class="nf">imageData</span><span class="p">(</span><span class="n">byRotatingImageData</span> <span class="nv">sourceData</span><span class="p">:</span> <span class="kt">Data</span><span class="p">,</span> <span class="k">for</span> <span class="nv">rotation</span><span class="p">:</span> <span class="kt">ExifRotation</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Data</span><span class="p">?</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>sourceData</em>
</code>
</td>
<td>
<div>
<p>The source image data.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>rotation</em>
</code>
</td>
<td>
<div>
<p>The EXIF rotation to apply to the image data.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The rotated image, or <code>nil</code> if the given data wasn’t a valid image or an error occurred.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)CBLImageManipulationHelpers(cm)cropMetadatalessThumbnail:basedOnMetadata:"></a>
<a name="//apple_ref/objc/Method/+cropMetadatalessThumbnail:basedOnMetadata:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)CBLImageManipulationHelpers(cm)cropMetadatalessThumbnail:basedOnMetadata:">+cropMetadatalessThumbnail:<wbr>basedOnMetadata:<wbr></a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Crop the given thumbnail image based on the given metadata.</p>
<p>Embedded thumbnails tend to be of a fixed size no matter the size and aspect ratio of the original image. This
can result in black bars being encoded into the thumbnail image. This image will attempt to derive and perform
a sensible crop based on the passed ImageIO metadata.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight objective_c"><code><span class="k">+</span> <span class="p">(</span><span class="n">UIImage</span> <span class="o">*</span><span class="n">_Nonnull</span><span class="p">)</span><span class="nf">cropMetadatalessThumbnail</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">CGImageRef</span><span class="p">)</span><span class="nv">thumbnail</span>
<span class="nf">basedOnMetadata</span><span class="p">:</span>
<span class="p">(</span><span class="n">nullable</span> <span class="n">NSDictionary</span> <span class="o">*</span><span class="p">)</span><span class="nv">metadata</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kd">func</span> <span class="nf">cropMetadatalessThumbnail</span><span class="p">(</span><span class="n">_</span> <span class="nv">thumbnail</span><span class="p">:</span> <span class="kt">CGImage</span><span class="p">,</span> <span class="n">basedOnMetadata</span> <span class="nv">metadata</span><span class="p">:</span> <span class="p">[</span><span class="kt">AnyHashable</span> <span class="p">:</span> <span class="kt">Any</span><span class="p">]?)</span> <span class="o">-></span> <span class="kt">UIImage</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>thumbnail</em>
</code>
</td>
<td>
<div>
<p>The thumbnail image to crop.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>metadata</em>
</code>
</td>
<td>
<div>
<p>The metadata to derive the crop factor from.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The cropped image.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)CBLImageManipulationHelpers(cm)cropMetadatalessThumbnail:toPreRotationRatio:"></a>
<a name="//apple_ref/objc/Method/+cropMetadatalessThumbnail:toPreRotationRatio:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)CBLImageManipulationHelpers(cm)cropMetadatalessThumbnail:toPreRotationRatio:">+cropMetadatalessThumbnail:<wbr>toPreRotationRatio:<wbr></a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Crop the given thumbnail image to the given aspect ratio.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight objective_c"><code><span class="k">+</span> <span class="p">(</span><span class="n">UIImage</span> <span class="o">*</span><span class="n">_Nonnull</span><span class="p">)</span><span class="nf">cropMetadatalessThumbnail</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">CGImageRef</span><span class="p">)</span><span class="nv">image</span>
<span class="nf">toPreRotationRatio</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">ratio</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kd">func</span> <span class="nf">cropMetadatalessThumbnail</span><span class="p">(</span><span class="n">_</span> <span class="nv">image</span><span class="p">:</span> <span class="kt">CGImage</span><span class="p">,</span> <span class="n">toPreRotationRatio</span> <span class="nv">ratio</span><span class="p">:</span> <span class="kt">CGFloat</span><span class="p">)</span> <span class="o">-></span> <span class="kt">UIImage</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>image</em>
</code>
</td>
<td>
<div>
<p>The image to crop.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>ratio</em>
</code>
</td>
<td>
<div>
<p>The aspect ratio to crop to.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The cropped image.</p>
</div>
</section>
</div>
</li>
</ul>
</div>
</section>
</section>
</article>
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