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<title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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<p class="navigation-index">[ <a href="#By default, ANSI memory methods are called (e.g. malloc">By default, ANSI memory methods are called (e.g. malloc</a> | <a href="#AcquireMagickMemory">AcquireMagickMemory</a> | <a href="#CopyMagickMemory">CopyMagickMemory</a> | <a href="#RelinquishMagickMemory">RelinquishMagickMemory</a> | <a href="#ResetMagickMemory">ResetMagickMemory</a> | <a href="#ResizeMagickMemory">ResizeMagickMemory</a> ]</p>
<div style="margin: auto;">
<h2><a name="By default, ANSI memory methods are called (e.g. malloc">By default, ANSI memory methods are called (e.g. malloc</a></h2>
</div>
<p>By default, ANSI memory methods are called (e.g. malloc()). Use the custom memory allocator by defining UseEmbeddableMagick. The custom memory allocator has the advantage of using memory-mapped heap allocation which permits the virtual memory to be returned to the system in all cases, unlike the ANSI memory methods that typically only memory-map large allocations.</p>
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<h2><a name="AcquireMagickMemory">AcquireMagickMemory</a></h2>
</div>
<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="code">
void *AcquireMagickMemory(const size_t size)
</pre>
<p>A description of each parameter follows:</p>
<h4>size</h4>
<p>The size of the memory in bytes to allocate.</p>
<div style="margin: auto;">
<h2><a name="CopyMagickMemory">CopyMagickMemory</a></h2>
</div>
<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="code">
void *CopyMagickMemory(void *destination,const void *source,
const size_t size)
</pre>
<p>A description of each parameter follows:</p>
<h4>destination</h4>
<p>The destination.</p>
<h4>source</h4>
<p>The source.</p>
<h4>size</h4>
<p>The size of the memory in bytes to allocate.</p>
<div style="margin: auto;">
<h2><a name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
</div>
<p>RelinquishMagickMemory() zeros memory that has been allocated, frees it for reuse.</p>
<p>The format of the RelinquishMagickMemory method is:</p>
<pre class="code">
void *RelinquishMagickMemory(void *memory)
</pre>
<p>A description of each parameter follows:</p>
<h4>memory</h4>
<p>A pointer to a block of memory to free for reuse.</p>
<div style="margin: auto;">
<h2><a name="ResetMagickMemory">ResetMagickMemory</a></h2>
</div>
<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="code">
void *ResetMagickMemory(void *memory,int byte,const size_t size)
</pre>
<p>A description of each parameter follows:</p>
<h4>memory</h4>
<p>A pointer to a memory allocation.</p>
<h4>byte</h4>
<p>Set the memory to this value.</p>
<h4>size</h4>
<p>Size of the memory to reset.</p>
<div style="margin: auto;">
<h2><a name="ResizeMagickMemory">ResizeMagickMemory</a></h2>
</div>
<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="code">
void *ResizeMagickMemory(void *memory,const size_t size)
</pre>
<p>A description of each parameter follows:</p>
<h4>memory</h4>
<p>A pointer to a memory allocation.</p>
<h4>size</h4>
<p>The new size of the allocated memory.</p>
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