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<h1>Module cache-view Methods</h1>
<p class="navigation-index">[<a href="cache-view.html#AcquireAuthenticCacheView">AcquireAuthenticCacheView</a> &bull; <a href="cache-view.html#AcquireVirtualCacheView">AcquireVirtualCacheView</a> &bull; <a href="cache-view.html#CloneCacheView">CloneCacheView</a> &bull; <a href="cache-view.html#DestroyCacheView">DestroyCacheView</a> &bull; <a href="cache-view.html#GetCacheViewChannels">GetCacheViewChannels</a> &bull; <a href="cache-view.html#GetCacheViewColorspace">GetCacheViewColorspace</a> &bull; <a href="cache-view.html#GetCacheViewException">GetCacheViewException</a> &bull; <a href="cache-view.html#GetCacheViewStorageClass">GetCacheViewStorageClass</a> &bull; <a href="cache-view.html#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> &bull; <a href="cache-view.html#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> &bull; <a href="cache-view.html#GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a> &bull; <a href="cache-view.html#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> &bull; <a href="cache-view.html#GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a> &bull; <a href="cache-view.html#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> &bull; <a href="cache-view.html#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> &bull; <a href="cache-view.html#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> &bull; <a href="cache-view.html#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> &bull; <a href="cache-view.html#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> &bull; <a href="cache-view.html#SetCacheViewStorageClass">SetCacheViewStorageClass</a> &bull; <a href="cache-view.html#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> &bull; <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>
<div class="doc-section">
<p>AcquireAuthenticCacheView() acquires an authentic view into the pixel cache.</p>
<p>The format of the AcquireAuthenticCacheView method is:</p>
<pre class="code">
CacheView *AcquireAuthenticCacheView(const Image *image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireVirtualCacheView">AcquireVirtualCacheView</a></h2>
<div class="doc-section">
<p>AcquireVirtualCacheView() acquires a virtual view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
<p>The format of the AcquireVirtualCacheView method is:</p>
<pre class="code">
CacheView *AcquireVirtualCacheView(const Image *image,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>image</h5>
<p>the image.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
<div class="doc-section">
<p>CloneCacheView() makes an exact copy of the specified cache view.</p>
<p>The format of the CloneCacheView method is:</p>
<pre class="code">
CacheView *CloneCacheView(const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
<div class="doc-section">
<p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireVirtualCacheView().</p>
<p>The format of the DestroyCacheView method is:</p>
<pre class="code">
CacheView *DestroyCacheView(CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewChannels">GetCacheViewChannels</a></h2>
<div class="doc-section">
<p>GetCacheViewChannels() returns the image pixel channels associated with the specified view.</p>
<p>The format of the GetCacheViewChannels method is:</p>
<pre class="code">
size_t GetCacheViewChannels(const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
<div class="doc-section">
<p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
<p>The format of the GetCacheViewColorspace method is:</p>
<pre class="code">
ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
<div class="doc-section">
<p>GetCacheViewException() returns the image exception associated with the specified view.</p>
<p>The format of the GetCacheViewException method is:</p>
<pre class="code">
ExceptionInfo GetCacheViewException(const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
<div class="doc-section">
<p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
<p>The format of the GetCacheViewStorageClass method is:</p>
<pre class="code">
ClassType GetCacheViewStorageClass(const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
<div class="doc-section">
<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="code">
PixelPacket *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>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>x,y,columns,rows</h5>
<p>These values define the perimeter of a region of pixels.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
<div class="doc-section">
<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="code">
MagickBooleaNType GetOneCacheViewAuthenticPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
Pixelpacket *pixel,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>x,y</h5>
<p>These values define the offset of the pixel.</p>
<h5>pixel</h5>
<p>return a pixel at the specified (x,y) location.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a></h2>
<div class="doc-section">
<p>GetCacheViewAuthenticIndexQueue() returns the indexes associated with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticIndexQueue(). The indexes are authentic and can be updated.</p>
<p>The format of the GetCacheViewAuthenticIndexQueue() method is:</p>
<pre class="code">
IndexPacket *GetCacheViewAuthenticIndexQueue(CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
<div class="doc-section">
<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="code">
PixelPacket *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a></h2>
<div class="doc-section">
<p>GetCacheViewVirtualIndexQueue() returns the indexes associated with the last call to GetCacheViewVirtualIndexQueue(). The indexes are virtual and therefore cannot be updated.</p>
<p>The format of the GetCacheViewVirtualIndexQueue() method is:</p>
<pre class="code">
const IndexPacket *GetCacheViewVirtualIndexQueue(
const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
<div class="doc-section">
<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="code">
const PixelPacket *GetCacheViewVirtualPixelQueue(
const CacheView *cache_view)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
<div class="doc-section">
<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="code">
const PixelPacket *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>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>x,y,columns,rows</h5>
<p>These values define the perimeter of a region of pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
<div class="doc-section">
<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="code">
MagickBooleanType GetOneCacheViewVirtualPixel(
const CacheView *cache_view,const ssize_t x,const ssize_t y,
PixelPacket *pixel,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>x,y</h5>
<p>These values define the offset of the pixel.</p>
<h5>pixel</h5>
<p>return a pixel at the specified (x,y) location.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
<div class="doc-section">
<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="code">
MagickBooleanType GetOneCacheViewVirtualMethodPixel(
const CacheView *cache_view,
const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>virtual_pixel_method</h5>
<p>the virtual pixel method.</p>
<h5>x,y</h5>
<p>These values define the offset of the pixel.</p>
<h5>pixel</h5>
<p>return a pixel at the specified (x,y) location.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
<div class="doc-section">
<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="code">
PixelPacket *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>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>x,y,columns,rows</h5>
<p>These values define the perimeter of a region of pixels.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
<div class="doc-section">
<p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
<p>The format of the SetCacheViewStorageClass method is:</p>
<pre class="code">
MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
const ClassType storage_class)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>storage_class</h5>
<p>the image storage class: PseudoClass or DirectClass.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
<div class="doc-section">
<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="code">
MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
const VirtualPixelMethod virtual_pixel_method)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>virtual_pixel_method</h5>
<p>the virtual pixel method.</p>
</div>
<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
<div class="doc-section">
<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="code">
MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h5>cache_view</h5>
<p>the cache view.</p>
<h5>exception</h5>
<p>return any errors or warnings in this structure.</p>
</div>
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