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    <title>ImageMagick: MagickCore, C API for ImageMagick: Cache Views</title>
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<p class="text-center"><a href="cache-view.html#AcquireAuthenticCacheView">AcquireAuthenticCacheView</a> • <a href="cache-view.html#AcquireVirtualCacheView">AcquireVirtualCacheView</a> • <a href="cache-view.html#CloneCacheView">CloneCacheView</a> • <a href="cache-view.html#DestroyCacheView">DestroyCacheView</a> • <a href="cache-view.html#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> • <a href="cache-view.html#GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a> • <a href="cache-view.html#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> • <a href="cache-view.html#GetCacheViewColorspace">GetCacheViewColorspace</a> • <a href="cache-view.html#GetCacheViewImage">GetCacheViewImage</a> • <a href="cache-view.html#GetCacheViewStorageClass">GetCacheViewStorageClass</a> • <a href="cache-view.html#GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a> • <a href="cache-view.html#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> • <a href="cache-view.html#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> • <a href="cache-view.html#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> • <a href="cache-view.html#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> • <a href="cache-view.html#GetOneCacheViewVirtualPixelInfo">GetOneCacheViewVirtualPixelInfo</a> • <a href="cache-view.html#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> • <a href="cache-view.html#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> • <a href="cache-view.html#SetCacheViewStorageClass">SetCacheViewStorageClass</a> • <a href="cache-view.html#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> • <a href="cache-view.html#SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></p>

<h2><a href="http://www.imagemagick.org/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="text">
CacheView *AcquireAuthenticCacheView(const Image *image,
  ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
CacheView *AcquireVirtualCacheView(const Image *image,
  ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
CacheView *CloneCacheView(const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
CacheView *DestroyCacheView(CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
Quantum *GetCacheViewAuthenticPixels(CacheView *cache_view,
  const ssize_t x,const ssize_t y,const size_t columns,
  const size_t rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
void *GetCacheViewAuthenticMetacontent(CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
Quantum *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
const Image *GetCacheViewImage(const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
ClassType GetCacheViewStorageClass(const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
const void *GetCacheViewVirtualMetacontent(
  const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>

<p>GetCacheViewVirtualPixelQueue() returns the 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="text">
const Quantum *GetCacheViewVirtualPixelQueue(
  const CacheView *cache_view)
</pre>

<p>A description of each parameter follows:</p>

<dd> </dd>
<dl class="dl-horizontal">
<dt>cache_view</dt>
<dd>the cache view. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/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="text">
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)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleaNType GetOneCacheViewAuthenticPixel(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  Quantum *pixel,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualPixel(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  Quantum *pixel,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualPixelInfo(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  PixelInfo *pixel,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualMethodPixel(
  const CacheView *cache_view,
  const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
  const ssize_t y,Quantum *pixel,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
Quantum *QueueCacheViewAuthenticPixels(CacheView *cache_view,
  const ssize_t x,const ssize_t y,const size_t columns,
  const size_t rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
  const ClassType storage_class,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
  const VirtualPixelMethod virtual_pixel_method)
</pre>

<p>A description of each parameter follows:</p>

<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="http://www.imagemagick.org/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="text">
MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
  ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<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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<p class="text-center"><a href="cache-view.html#AcquireAuthenticCacheView">AcquireAuthenticCacheView</a> &#8226; <a href="cache-view.html#AcquireVirtualCacheView">AcquireVirtualCacheView</a> &#8226; <a href="cache-view.html#CloneCacheView">CloneCacheView</a> &#8226; <a href="cache-view.html#DestroyCacheView">DestroyCacheView</a> &#8226; <a href="cache-view.html#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> &#8226; <a href="cache-view.html#GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a> &#8226; <a href="cache-view.html#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> &#8226; <a href="cache-view.html#GetCacheViewColorspace">GetCacheViewColorspace</a> &#8226; <a href="cache-view.html#GetCacheViewImage">GetCacheViewImage</a> &#8226; <a href="cache-view.html#GetCacheViewStorageClass">GetCacheViewStorageClass</a> &#8226; <a href="cache-view.html#GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a> &#8226; <a href="cache-view.html#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> &#8226; <a href="cache-view.html#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> &#8226; <a href="cache-view.html#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> &#8226; <a href="cache-view.html#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> &#8226; <a href="cache-view.html#GetOneCacheViewVirtualPixelInfo">GetOneCacheViewVirtualPixelInfo</a> &#8226; <a href="cache-view.html#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> &#8226; <a href="cache-view.html#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> &#8226; <a href="cache-view.html#SetCacheViewStorageClass">SetCacheViewStorageClass</a> &#8226; <a href="cache-view.html#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> &#8226; <a href="cache-view.html#SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></p>

<h2><a href="http://www.imagemagick.org/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="text">
CacheView *AcquireAuthenticCacheView(const Image *image,
  ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
CacheView *AcquireVirtualCacheView(const Image *image,
  ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
CacheView *CloneCacheView(const CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
CacheView *DestroyCacheView(CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
Quantum *GetCacheViewAuthenticPixels(CacheView *cache_view,
  const ssize_t x,const ssize_t y,const size_t columns,
  const size_t rows,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
void *GetCacheViewAuthenticMetacontent(CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
Quantum *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
const Image *GetCacheViewImage(const CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
ClassType GetCacheViewStorageClass(const CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
const void *GetCacheViewVirtualMetacontent(
  const CacheView *cache_view)
</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="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>

<p>GetCacheViewVirtualPixelQueue() returns the 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="text">
const Quantum *GetCacheViewVirtualPixelQueue(
  const CacheView *cache_view)
</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="http://www.imagemagick.org/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="text">
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)
</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="http://www.imagemagick.org/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="text">
MagickBooleaNType GetOneCacheViewAuthenticPixel(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  Quantum *pixel,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualPixel(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  Quantum *pixel,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualPixelInfo(
  const CacheView *cache_view,const ssize_t x,const ssize_t y,
  PixelInfo *pixel,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType GetOneCacheViewVirtualMethodPixel(
  const CacheView *cache_view,
  const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
  const ssize_t y,Quantum *pixel,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
Quantum *QueueCacheViewAuthenticPixels(CacheView *cache_view,
  const ssize_t x,const ssize_t y,const size_t columns,
  const size_t rows,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
  const ClassType storage_class,ExceptionInfo *exception)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
  const VirtualPixelMethod virtual_pixel_method)
</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="http://www.imagemagick.org/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="text">
MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
  ExceptionInfo *exception)
</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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