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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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158 <p class="navigation-index">[<a href="#AcquireAlignedMemory">AcquireAlignedMemory</a> • <a href="#AcquireMagickMemory">AcquireMagickMemory</a> • <a href="#AcquireQuantumMemory">AcquireQuantumMemory</a> • <a href="#CopyMagickMemory">CopyMagickMemory</a> • <a href="#GetMagickMemoryMethods">GetMagickMemoryMethods</a> • <a href="#RelinquishAlignedMemory">RelinquishAlignedMemory</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>
160 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
161 _8c.html" target="source" name="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>
162 <div class="doc-section">
164 <p>AcquireAlignedMemory() returns a pointer to a block of memory at least size bytes whose address is a multiple of 16*sizeof(void *).</p></ol>
166 <p>The format of the AcquireAlignedMemory method is:</p>
169 void *AcquireAlignedMemory(const size_t count,const size_t quantum)
172 <p>A description of each parameter follows:</p></ol>
175 <ol><p>the number of quantum elements to allocate.</p></ol>
178 <ol><p>the number of bytes in each quantum.</p></ol>
181 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
182 _8c.html" target="source" name="AcquireMagickMemory">AcquireMagickMemory</a></h2>
183 <div class="doc-section">
185 <p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p></ol>
187 <p>The format of the AcquireMagickMemory method is:</p>
190 void *AcquireMagickMemory(const size_t size)
193 <p>A description of each parameter follows:</p></ol>
196 <ol><p>the size of the memory in bytes to allocate.</p></ol>
199 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
200 _8c.html" target="source" name="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
201 <div class="doc-section">
203 <p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p></ol>
205 <p>The format of the AcquireQuantumMemory method is:</p>
208 void *AcquireQuantumMemory(const size_t count,const size_t quantum)
211 <p>A description of each parameter follows:</p></ol>
214 <ol><p>the number of quantum elements to allocate.</p></ol>
217 <ol><p>the number of bytes in each quantum.</p></ol>
220 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
221 _8c.html" target="source" name="CopyMagickMemory">CopyMagickMemory</a></h2>
222 <div class="doc-section">
224 <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>
226 <p>The format of the CopyMagickMemory method is:</p>
229 void *CopyMagickMemory(void *destination,const void *source,
233 <p>A description of each parameter follows:</p></ol>
236 <ol><p>the destination.</p></ol>
239 <ol><p>the source.</p></ol>
242 <ol><p>the size of the memory in bytes to allocate.</p></ol>
245 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
246 _8c.html" target="source" name="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
247 <div class="doc-section">
249 <p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p></ol>
251 <p>The format of the GetMagickMemoryMethods() method is:</p>
254 void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
255 ResizeMemoryHandler *resize_memory_handler,
256 DestroyMemoryHandler *destroy_memory_handler)
259 <p>A description of each parameter follows:</p></ol>
261 <h5>acquire_memory_handler</h5>
262 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
264 <h5>resize_memory_handler</h5>
265 <ol><p>method to resize memory (e.g. realloc).</p></ol>
267 <h5>destroy_memory_handler</h5>
268 <ol><p>method to destroy memory (e.g. free).</p></ol>
271 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
272 _8c.html" target="source" name="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>
273 <div class="doc-section">
275 <p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p></ol>
277 <p>The format of the RelinquishAlignedMemory method is:</p>
280 void *RelinquishAlignedMemory(void *memory)
283 <p>A description of each parameter follows:</p></ol>
286 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
289 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
290 _8c.html" target="source" name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
291 <div class="doc-section">
293 <p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p></ol>
295 <p>The format of the RelinquishMagickMemory method is:</p>
298 void *RelinquishMagickMemory(void *memory)
301 <p>A description of each parameter follows:</p></ol>
304 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
307 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
308 _8c.html" target="source" name="ResetMagickMemory">ResetMagickMemory</a></h2>
309 <div class="doc-section">
311 <p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p></ol>
313 <p>The format of the ResetMagickMemory method is:</p>
316 void *ResetMagickMemory(void *memory,int byte,const size_t size)
319 <p>A description of each parameter follows:</p></ol>
322 <ol><p>A pointer to a memory allocation.</p></ol>
325 <ol><p>Set the memory to this value.</p></ol>
328 <ol><p>Size of the memory to reset.</p></ol>
331 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
332 _8c.html" target="source" name="ResizeMagickMemory">ResizeMagickMemory</a></h2>
333 <div class="doc-section">
335 <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>
337 <p>The format of the ResizeMagickMemory method is:</p>
340 void *ResizeMagickMemory(void *memory,const size_t size)
343 <p>A description of each parameter follows:</p></ol>
346 <ol><p>A pointer to a memory allocation.</p></ol>
349 <ol><p>the new size of the allocated memory.</p></ol>
352 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
353 _8c.html" target="source" name="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
354 <div class="doc-section">
356 <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>
358 <p>The format of the ResizeQuantumMemory method is:</p>
361 void *ResizeQuantumMemory(void *memory,const size_t count,
362 const size_t quantum)
365 <p>A description of each parameter follows:</p></ol>
368 <ol><p>A pointer to a memory allocation.</p></ol>
371 <ol><p>the number of quantum elements to allocate.</p></ol>
374 <ol><p>the number of bytes in each quantum.</p></ol>
377 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
378 _8c.html" target="source" name="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
379 <div class="doc-section">
381 <p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p></ol>
383 <p>The format of the SetMagickMemoryMethods() method is:</p>
386 SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
387 ResizeMemoryHandler resize_memory_handler,
388 DestroyMemoryHandler destroy_memory_handler)
391 <p>A description of each parameter follows:</p></ol>
393 <h5>acquire_memory_handler</h5>
394 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
396 <h5>resize_memory_handler</h5>
397 <ol><p>method to resize memory (e.g. realloc).</p></ol>
399 <h5>destroy_memory_handler</h5>
400 <ol><p>method to destroy memory (e.g. free).</p></ol>
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