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11 <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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151 <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>
153 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
154 _8c.html" target="source" name="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>
155 <div class="doc-section">
157 <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>
159 <p>The format of the AcquireAlignedMemory method is:</p>
162 void *AcquireAlignedMemory(const size_t count,const size_t quantum)
165 <p>A description of each parameter follows:</p></ol>
168 <ol><p>the number of quantum elements to allocate.</p></ol>
171 <ol><p>the number of bytes in each quantum.</p></ol>
174 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
175 _8c.html" target="source" name="AcquireMagickMemory">AcquireMagickMemory</a></h2>
176 <div class="doc-section">
178 <p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p></ol>
180 <p>The format of the AcquireMagickMemory method is:</p>
183 void *AcquireMagickMemory(const size_t size)
186 <p>A description of each parameter follows:</p></ol>
189 <ol><p>the size of the memory in bytes to allocate.</p></ol>
192 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
193 _8c.html" target="source" name="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
194 <div class="doc-section">
196 <p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p></ol>
198 <p>The format of the AcquireQuantumMemory method is:</p>
201 void *AcquireQuantumMemory(const size_t count,const size_t quantum)
204 <p>A description of each parameter follows:</p></ol>
207 <ol><p>the number of quantum elements to allocate.</p></ol>
210 <ol><p>the number of bytes in each quantum.</p></ol>
213 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
214 _8c.html" target="source" name="CopyMagickMemory">CopyMagickMemory</a></h2>
215 <div class="doc-section">
217 <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>
219 <p>The format of the CopyMagickMemory method is:</p>
222 void *CopyMagickMemory(void *destination,const void *source,
226 <p>A description of each parameter follows:</p></ol>
229 <ol><p>the destination.</p></ol>
232 <ol><p>the source.</p></ol>
235 <ol><p>the size of the memory in bytes to allocate.</p></ol>
238 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
239 _8c.html" target="source" name="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
240 <div class="doc-section">
242 <p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p></ol>
244 <p>The format of the GetMagickMemoryMethods() method is:</p>
247 void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
248 ResizeMemoryHandler *resize_memory_handler,
249 DestroyMemoryHandler *destroy_memory_handler)
252 <p>A description of each parameter follows:</p></ol>
254 <h5>acquire_memory_handler</h5>
255 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
257 <h5>resize_memory_handler</h5>
258 <ol><p>method to resize memory (e.g. realloc).</p></ol>
260 <h5>destroy_memory_handler</h5>
261 <ol><p>method to destroy memory (e.g. free).</p></ol>
264 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
265 _8c.html" target="source" name="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>
266 <div class="doc-section">
268 <p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p></ol>
270 <p>The format of the RelinquishAlignedMemory method is:</p>
273 void *RelinquishAlignedMemory(void *memory)
276 <p>A description of each parameter follows:</p></ol>
279 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
282 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
283 _8c.html" target="source" name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
284 <div class="doc-section">
286 <p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p></ol>
288 <p>The format of the RelinquishMagickMemory method is:</p>
291 void *RelinquishMagickMemory(void *memory)
294 <p>A description of each parameter follows:</p></ol>
297 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
300 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
301 _8c.html" target="source" name="ResetMagickMemory">ResetMagickMemory</a></h2>
302 <div class="doc-section">
304 <p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p></ol>
306 <p>The format of the ResetMagickMemory method is:</p>
309 void *ResetMagickMemory(void *memory,int byte,const size_t size)
312 <p>A description of each parameter follows:</p></ol>
315 <ol><p>A pointer to a memory allocation.</p></ol>
318 <ol><p>Set the memory to this value.</p></ol>
321 <ol><p>Size of the memory to reset.</p></ol>
324 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
325 _8c.html" target="source" name="ResizeMagickMemory">ResizeMagickMemory</a></h2>
326 <div class="doc-section">
328 <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>
330 <p>The format of the ResizeMagickMemory method is:</p>
333 void *ResizeMagickMemory(void *memory,const size_t size)
336 <p>A description of each parameter follows:</p></ol>
339 <ol><p>A pointer to a memory allocation.</p></ol>
342 <ol><p>the new size of the allocated memory.</p></ol>
345 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
346 _8c.html" target="source" name="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
347 <div class="doc-section">
349 <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>
351 <p>The format of the ResizeQuantumMemory method is:</p>
354 void *ResizeQuantumMemory(void *memory,const size_t count,
355 const size_t quantum)
358 <p>A description of each parameter follows:</p></ol>
361 <ol><p>A pointer to a memory allocation.</p></ol>
364 <ol><p>the number of quantum elements to allocate.</p></ol>
367 <ol><p>the number of bytes in each quantum.</p></ol>
370 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
371 _8c.html" target="source" name="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
372 <div class="doc-section">
374 <p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p></ol>
376 <p>The format of the SetMagickMemoryMethods() method is:</p>
379 SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
380 ResizeMemoryHandler resize_memory_handler,
381 DestroyMemoryHandler destroy_memory_handler)
384 <p>A description of each parameter follows:</p></ol>
386 <h5>acquire_memory_handler</h5>
387 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
389 <h5>resize_memory_handler</h5>
390 <ol><p>method to resize memory (e.g. realloc).</p></ol>
392 <h5>destroy_memory_handler</h5>
393 <ol><p>method to destroy memory (e.g. free).</p></ol>
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