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<title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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<p class="navigation-index">[ <a href="#AcquireMagickMemory">AcquireMagickMemory</a> | <a href="#AcquireQuantumMemory">AcquireQuantumMemory</a> | <a href="#CopyMagickMemory">CopyMagickMemory</a> | <a href="#GetMagickMemoryMethods">GetMagickMemoryMethods</a> | <a href="#RelinquishMagickMemory">RelinquishMagickMemory</a> | <a href="#ResetMagickMemory">ResetMagickMemory</a> | <a href="#ResizeMagickMemory">ResizeMagickMemory</a> | <a href="#ResizeQuantumMemory">ResizeQuantumMemory</a> | <a href="#SetMagickMemoryMethods">SetMagickMemoryMethods</a> ]</p>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" 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></ol>
<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></ol>
<h5>size</h5>
<ol><p>the size of the memory in bytes to allocate.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" name="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
</div>
<p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p></ol>
<p>The format of the AcquireQuantumMemory method is:</p>
<pre class="code">
void *AcquireQuantumMemory(const size_t count,const size_t quantum)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>count</h5>
<ol><p>the number of quantum elements to allocate.</p></ol>
<h5>quantum</h5>
<ol><p>the number of bytes in each quantum.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" 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></ol>
<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></ol>
<h5>destination</h5>
<ol><p>the destination.</p></ol>
<h5>source</h5>
<ol><p>the source.</p></ol>
<h5>size</h5>
<ol><p>the size of the memory in bytes to allocate.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" name="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
</div>
<p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p></ol>
<p>The format of the GetMagickMemoryMethods() method is:</p>
<pre class="code">
void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
ResizeMemoryHandler *resize_memory_handler,
DestroyMemoryHandler *destroy_memory_handler)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>acquire_memory_handler</h5>
<ol><p>method to acquire memory (e.g. malloc).</p></ol>
<h5>resize_memory_handler</h5>
<ol><p>method to resize memory (e.g. realloc).</p></ol>
<h5>destroy_memory_handler</h5>
<ol><p>method to destroy memory (e.g. free).</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
</div>
<p>RelinquishMagickMemory() zeros memory that has been allocated, frees it for reuse.</p></ol>
<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></ol>
<h5>memory</h5>
<ol><p>A pointer to a block of memory to free for reuse.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" 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></ol>
<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></ol>
<h5>memory</h5>
<ol><p>A pointer to a memory allocation.</p></ol>
<h5>byte</h5>
<ol><p>Set the memory to this value.</p></ol>
<h5>size</h5>
<ol><p>Size of the memory to reset.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" 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></ol>
<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></ol>
<h5>memory</h5>
<ol><p>A pointer to a memory allocation.</p></ol>
<h5>size</h5>
<ol><p>the new size of the allocated memory.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" name="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
</div>
<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></ol>
<p>The format of the ResizeQuantumMemory method is:</p>
<pre class="code">
void *ResizeQuantumMemory(void *memory,const size_t count,
const size_t quantum)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>memory</h5>
<ol><p>A pointer to a memory allocation.</p></ol>
<h5>count</h5>
<ol><p>the number of quantum elements to allocate.</p></ol>
<h5>quantum</h5>
<ol><p>the number of bytes in each quantum.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/memory
_8c.html" target="source" name="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
</div>
<p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p></ol>
<p>The format of the SetMagickMemoryMethods() method is:</p>
<pre class="code">
SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
ResizeMemoryHandler resize_memory_handler,
DestroyMemoryHandler destroy_memory_handler)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>acquire_memory_handler</h5>
<ol><p>method to acquire memory (e.g. malloc).</p></ol>
<h5>resize_memory_handler</h5>
<ol><p>method to resize memory (e.g. realloc).</p></ol>
<h5>destroy_memory_handler</h5>
<ol><p>method to destroy memory (e.g. free).</p></ol>
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