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<h1 class="mt-5 fs-3">MagickCore, C API: Cache Views</h1>
</a>
</header>
<main class="container">
<h1 class="text-center">Cache-view</h1>
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="defaultDropdown" data-bs-toggle="dropdown" data-bs-auto-close="true" aria-expanded="false">
Select API Method
</button>
<ul class="dropdown-menu pre-scrollable" aria-labelledby="defaultDropdown">
<li><a href="#AcquireAuthenticCacheView">AcquireAuthenticCacheView</a></li>
<li><a href="#AcquireVirtualCacheView">AcquireVirtualCacheView</a></li>
<li><a href="#CloneCacheView">CloneCacheView</a></li>
<li><a href="#DestroyCacheView">DestroyCacheView</a></li>
<li><a href="#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></li>
<li><a href="#GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a></li>
<li><a href="#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></li>
<li><a href="#GetCacheViewColorspace">GetCacheViewColorspace</a></li>
<li><a href="#GetCacheViewImage">GetCacheViewImage</a></li>
<li><a href="#GetCacheViewStorageClass">GetCacheViewStorageClass</a></li>
<li><a href="#GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a></li>
<li><a href="#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></li>
<li><a href="#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></li>
<li><a href="#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></li>
<li><a href="#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></li>
<li><a href="#GetOneCacheViewVirtualPixelInfo">GetOneCacheViewVirtualPixelInfo</a></li>
<li><a href="#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></li>
<li><a href="#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></li>
<li><a href="#SetCacheViewStorageClass">SetCacheViewStorageClass</a></li>
<li><a href="#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></li>
</ul>
</div>
<br/>
<br/>
<div class="magick-header">
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="AcquireAuthenticCacheView">AcquireAuthenticCacheView</a></h2>
<p>AcquireAuthenticCacheView() acquires an authentic view into the pixel cache. It always succeeds but may return a warning or informational exception.</p>
<p>The format of the AcquireAuthenticCacheView method is:</p>
<pre class="bg-light text-dark mx-4"><samp>CacheView *AcquireAuthenticCacheView(const Image *image,
ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>image</dt>
<dd>the image. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="AcquireVirtualCacheView">AcquireVirtualCacheView</a></h2>
<p>AcquireVirtualCacheView() acquires a virtual view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself. It always succeeds but may return a warning or informational exception.</p>
<p>The format of the AcquireVirtualCacheView method is:</p>
<pre class="bg-light text-dark mx-4"><samp>CacheView *AcquireVirtualCacheView(const Image *image,
ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>image</dt>
<dd>the image. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
<p>CloneCacheView() makes an exact copy of the specified cache view.</p>
<p>The format of the CloneCacheView method is:</p>
<pre class="bg-light text-dark mx-4"><samp>CacheView *CloneCacheView(const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
<p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireCacheView().</p>
<p>The format of the DestroyCacheView method is:</p>
<pre class="bg-light text-dark mx-4"><samp>CacheView *DestroyCacheView(CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
<p>GetCacheViewAuthenticPixels() gets pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
<p>The format of the GetCacheViewAuthenticPixels method is:</p>
<pre class="bg-light text-dark mx-4"><samp>Quantum *GetCacheViewAuthenticPixels(CacheView *cache_view,
const ssize_t x,const ssize_t y,const size_t columns,
const size_t rows,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y,columns,rows</dt>
<dd> These values define the perimeter of a region of pixels. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a></h2>
<p>GetCacheViewAuthenticMetacontent() returns the meta-content corresponding with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticMetacontent(). The meta-content are authentic and can be updated.</p>
<p>The format of the GetCacheViewAuthenticMetacontent() method is:</p>
<pre class="bg-light text-dark mx-4"><samp>void *GetCacheViewAuthenticMetacontent(CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
<p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
<p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
<pre class="bg-light text-dark mx-4"><samp>Quantum *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
<p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
<p>The format of the GetCacheViewColorspace method is:</p>
<pre class="bg-light text-dark mx-4"><samp>ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewImage">GetCacheViewImage</a></h2>
<p>GetCacheViewImage() returns the image associated with the specified view.</p>
<p>The format of the GetCacheViewImage method is:</p>
<pre class="bg-light text-dark mx-4"><samp>const Image *GetCacheViewImage(const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
<p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
<p>The format of the GetCacheViewStorageClass method is:</p>
<pre class="bg-light text-dark mx-4"><samp>ClassType GetCacheViewStorageClass(const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a></h2>
<p>GetCacheViewVirtualMetacontent() returns the meta-content corresponding with the last call to GetCacheViewVirtualMetacontent(). The meta-content is virtual and therefore cannot be updated.</p>
<p>The format of the GetCacheViewVirtualMetacontent() method is:</p>
<pre class="bg-light text-dark mx-4"><samp>const void *GetCacheViewVirtualMetacontent(
const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
<p>GetCacheViewVirtualPixelQueue() returns the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
<p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
<pre class="bg-light text-dark mx-4"><samp>const Quantum *GetCacheViewVirtualPixelQueue(
const CacheView *cache_view)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
<p>GetCacheViewVirtualPixels() gets virtual pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
<p>The format of the GetCacheViewVirtualPixels method is:</p>
<pre class="bg-light text-dark mx-4"><samp>const Quantum *GetCacheViewVirtualPixels(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
const size_t columns,const size_t rows,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y,columns,rows</dt>
<dd> These values define the perimeter of a region of pixels. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
<p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
<p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType GetOneCacheViewAuthenticPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
Quantum *pixel,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y</dt>
<dd> These values define the offset of the pixel. </dd>
<dd> </dd>
<dt>pixel</dt>
<dd>return a pixel at the specified (x,y) location. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
<p>GetOneCacheViewVirtualPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.</p>
<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType GetOneCacheViewVirtualPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
Quantum *pixel,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y</dt>
<dd> These values define the offset of the pixel. </dd>
<dd> </dd>
<dt>pixel</dt>
<dd>return a pixel at the specified (x,y) location. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixelInfo">GetOneCacheViewVirtualPixelInfo</a></h2>
<p>GetOneCacheViewVirtualPixelInfo() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.</p>
<p>The format of the GetOneCacheViewVirtualPixelInfo method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType GetOneCacheViewVirtualPixelInfo(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
PixelInfo *pixel,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y</dt>
<dd> These values define the offset of the pixel. </dd>
<dd> </dd>
<dt>pixel</dt>
<dd>return a pixel at the specified (x,y) location. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
<p>GetOneCacheViewVirtualMethodPixel() returns a single virtual pixel at the specified (x,y) location. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.</p>
<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType GetOneCacheViewVirtualMethodPixel(
const CacheView *cache_view,
const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
const ssize_t y,Quantum *pixel,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>virtual_pixel_method</dt>
<dd>the virtual pixel method. </dd>
<dd> </dd>
<dt>x,y</dt>
<dd> These values define the offset of the pixel. </dd>
<dd> </dd>
<dt>pixel</dt>
<dd>return a pixel at the specified (x,y) location. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
<p>QueueCacheViewAuthenticPixels() queues authentic pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
<p>The format of the QueueCacheViewAuthenticPixels method is:</p>
<pre class="bg-light text-dark mx-4"><samp>Quantum *QueueCacheViewAuthenticPixels(CacheView *cache_view,
const ssize_t x,const ssize_t y,const size_t columns,
const size_t rows,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>x,y,columns,rows</dt>
<dd> These values define the perimeter of a region of pixels. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
<p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
<p>The format of the SetCacheViewStorageClass method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
const ClassType storage_class,ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>storage_class</dt>
<dd>the image storage class: PseudoClass or DirectClass. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
<p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
<p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
const VirtualPixelMethod virtual_pixel_method)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>virtual_pixel_method</dt>
<dd>the virtual pixel method. </dd>
<dd> </dd>
</dl>
<h2><a href="../../api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
<p>SyncCacheViewAuthenticPixels() saves the cache view pixels to the in-memory or disk cache. It returns MagickTrue if the pixel region is flushed, otherwise MagickFalse.</p>
<p>The format of the SyncCacheViewAuthenticPixels method is:</p>
<pre class="bg-light text-dark mx-4"><samp>MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
ExceptionInfo *exception)
</samp></pre>
<p>A description of each parameter follows:</p>
<dd>
</dd>
<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>
<dd> </dd>
<dt>exception</dt>
<dd>return any errors or warnings in this structure. </dd>
<dd> </dd>
</dl>
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