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    <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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<p class="text-center"><a href="memory.html#AcquireAlignedMemory">AcquireAlignedMemory</a> &#8226; <a href="memory.html#AcquireMagickMemory">AcquireMagickMemory</a> &#8226; <a href="memory.html#AcquireQuantumMemory">AcquireQuantumMemory</a> &#8226; <a href="memory.html#AcquireVirtualMemory">AcquireVirtualMemory</a> &#8226; <a href="memory.html#CopyMagickMemory">CopyMagickMemory</a> &#8226; <a href="memory.html#GetMagickMemoryMethods">GetMagickMemoryMethods</a> &#8226; <a href="memory.html#GetVirtualMemoryBlob">GetVirtualMemoryBlob</a> &#8226; <a href="memory.html#RelinquishAlignedMemory">RelinquishAlignedMemory</a> &#8226; <a href="memory.html#RelinquishMagickMemory">RelinquishMagickMemory</a> &#8226; <a href="memory.html#RelinquishVirtualMemory">RelinquishVirtualMemory</a> &#8226; <a href="memory.html#ResetMagickMemory">ResetMagickMemory</a> &#8226; <a href="memory.html#ResizeMagickMemory">ResizeMagickMemory</a> &#8226; <a href="memory.html#ResizeQuantumMemory">ResizeQuantumMemory</a> &#8226; <a href="memory.html#SetMagickMemoryMethods">SetMagickMemoryMethods</a></p>

<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>

<p>AcquireAlignedMemory() returns a pointer to a block of memory at least size bytes whose address is a multiple of 16*sizeof(void *).</p>

<p>The format of the AcquireAlignedMemory method is:</p>

<pre class="text">
void *AcquireAlignedMemory(const size_t count,const size_t quantum)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>count</dt>
<dd>the number of quantum elements to allocate. </dd>

<dd> </dd>
<dt>quantum</dt>
<dd>the number of bytes in each quantum. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireMagickMemory">AcquireMagickMemory</a></h2>

<p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p>

<p>The format of the AcquireMagickMemory method is:</p>

<pre class="text">
void *AcquireMagickMemory(const size_t size)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>size</dt>
<dd>the size of the memory in bytes to allocate. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>

<p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p>

<p>The format of the AcquireQuantumMemory method is:</p>

<pre class="text">
void *AcquireQuantumMemory(const size_t count,const size_t quantum)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>count</dt>
<dd>the number of quantum elements to allocate. </dd>

<dd> </dd>
<dt>quantum</dt>
<dd>the number of bytes in each quantum. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireVirtualMemory">AcquireVirtualMemory</a></h2>

<p>AcquireVirtualMemory() allocates a pointer to a block of memory at least size bytes suitably aligned for any use.</p>

<p>The format of the AcquireVirtualMemory method is:</p>

<pre class="text">
MemoryInfo *AcquireVirtualMemory(const size_t count,const size_t quantum)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>count</dt>
<dd>the number of quantum elements to allocate. </dd>

<dd> </dd>
<dt>quantum</dt>
<dd>the number of bytes in each quantum. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="CopyMagickMemory">CopyMagickMemory</a></h2>

<p>CopyMagickMemory() copies size bytes from memory area source to the destination.  Copying between objects that overlap will take place correctly.  It returns destination.</p>

<p>The format of the CopyMagickMemory method is:</p>

<pre class="text">
void *CopyMagickMemory(void *destination,const void *source,
  const size_t size)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>destination</dt>
<dd>the destination. </dd>

<dd> </dd>
<dt>source</dt>
<dd>the source. </dd>

<dd> </dd>
<dt>size</dt>
<dd>the size of the memory in bytes to allocate. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>

<p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p>

<p>The format of the GetMagickMemoryMethods() method is:</p>

<pre class="text">
void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
  ResizeMemoryHandler *resize_memory_handler,
  DestroyMemoryHandler *destroy_memory_handler)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>acquire_memory_handler</dt>
<dd>method to acquire memory (e.g. malloc). </dd>

<dd> </dd>
<dt>resize_memory_handler</dt>
<dd>method to resize memory (e.g. realloc). </dd>

<dd> </dd>
<dt>destroy_memory_handler</dt>
<dd>method to destroy memory (e.g. free). </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="GetVirtualMemoryBlob">GetVirtualMemoryBlob</a></h2>

<p>GetVirtualMemoryBlob() returns the virtual memory blob associated with the specified MemoryInfo structure.</p>

<p>The format of the GetVirtualMemoryBlob method is:</p>

<pre class="text">
void *GetVirtualMemoryBlob(const MemoryInfo *memory_info)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory_info</dt>
<dd>The MemoryInfo structure.  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>

<p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p>

<p>The format of the RelinquishAlignedMemory method is:</p>

<pre class="text">
void *RelinquishAlignedMemory(void *memory)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory</dt>
<dd>A pointer to a block of memory to free for reuse. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>

<p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p>

<p>The format of the RelinquishMagickMemory method is:</p>

<pre class="text">
void *RelinquishMagickMemory(void *memory)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory</dt>
<dd>A pointer to a block of memory to free for reuse. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="RelinquishVirtualMemory">RelinquishVirtualMemory</a></h2>

<p>RelinquishVirtualMemory() frees memory acquired with AcquireVirtualMemory().</p>

<p>The format of the RelinquishVirtualMemory method is:</p>

<pre class="text">
MemoryInfo *RelinquishVirtualMemory(MemoryInfo *memory_info)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory_info</dt>
<dd>A pointer to a block of memory to free for reuse. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResetMagickMemory">ResetMagickMemory</a></h2>

<p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p>

<p>The format of the ResetMagickMemory method is:</p>

<pre class="text">
void *ResetMagickMemory(void *memory,int byte,const size_t size)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory</dt>
<dd>a pointer to a memory allocation. </dd>

<dd> </dd>
<dt>byte</dt>
<dd>set the memory to this value. </dd>

<dd> </dd>
<dt>size</dt>
<dd>size of the memory to reset. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResizeMagickMemory">ResizeMagickMemory</a></h2>

<p>ResizeMagickMemory() changes the size of the memory and returns a pointer to the (possibly moved) block.  The contents will be unchanged up to the lesser of the new and old sizes.</p>

<p>The format of the ResizeMagickMemory method is:</p>

<pre class="text">
void *ResizeMagickMemory(void *memory,const size_t size)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory</dt>
<dd>A pointer to a memory allocation. </dd>

<dd> </dd>
<dt>size</dt>
<dd>the new size of the allocated memory. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>

<p>ResizeQuantumMemory() changes the size of the memory and returns a pointer to the (possibly moved) block.  The contents will be unchanged up to the lesser of the new and old sizes.</p>

<p>The format of the ResizeQuantumMemory method is:</p>

<pre class="text">
void *ResizeQuantumMemory(void *memory,const size_t count,
  const size_t quantum)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>memory</dt>
<dd>A pointer to a memory allocation. </dd>

<dd> </dd>
<dt>count</dt>
<dd>the number of quantum elements to allocate. </dd>

<dd> </dd>
<dt>quantum</dt>
<dd>the number of bytes in each quantum. </dd>

<dd>  </dd>
</dl>
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>

<p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory. Your custom memory methods must be set prior to the MagickCoreGenesis() method.</p>

<p>The format of the SetMagickMemoryMethods() method is:</p>

<pre class="text">
SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
  ResizeMemoryHandler resize_memory_handler,
  DestroyMemoryHandler destroy_memory_handler)
</pre>

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

<dd>
</dd>

<dd> </dd>
<dl class="dl-horizontal">
<dt>acquire_memory_handler</dt>
<dd>method to acquire memory (e.g. malloc). </dd>

<dd> </dd>
<dt>resize_memory_handler</dt>
<dd>method to resize memory (e.g. realloc). </dd>

<dd> </dd>
<dt>destroy_memory_handler</dt>
<dd>method to destroy memory (e.g. free). </dd>

<dd>  </dd>
</dl>
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