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11 <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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154 <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>
156 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
157 _8c.html" target="source" name="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>
158 <div class="doc-section">
160 <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>
162 <p>The format of the AcquireAlignedMemory method is:</p>
165 void *AcquireAlignedMemory(const size_t count,const size_t quantum)
168 <p>A description of each parameter follows:</p></ol>
171 <ol><p>the number of quantum elements to allocate.</p></ol>
174 <ol><p>the number of bytes in each quantum.</p></ol>
177 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
178 _8c.html" target="source" name="AcquireMagickMemory">AcquireMagickMemory</a></h2>
179 <div class="doc-section">
181 <p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p></ol>
183 <p>The format of the AcquireMagickMemory method is:</p>
186 void *AcquireMagickMemory(const size_t size)
189 <p>A description of each parameter follows:</p></ol>
192 <ol><p>the size of the memory in bytes to allocate.</p></ol>
195 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
196 _8c.html" target="source" name="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
197 <div class="doc-section">
199 <p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p></ol>
201 <p>The format of the AcquireQuantumMemory method is:</p>
204 void *AcquireQuantumMemory(const size_t count,const size_t quantum)
207 <p>A description of each parameter follows:</p></ol>
210 <ol><p>the number of quantum elements to allocate.</p></ol>
213 <ol><p>the number of bytes in each quantum.</p></ol>
216 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
217 _8c.html" target="source" name="CopyMagickMemory">CopyMagickMemory</a></h2>
218 <div class="doc-section">
220 <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>
222 <p>The format of the CopyMagickMemory method is:</p>
225 void *CopyMagickMemory(void *destination,const void *source,
229 <p>A description of each parameter follows:</p></ol>
232 <ol><p>the destination.</p></ol>
235 <ol><p>the source.</p></ol>
238 <ol><p>the size of the memory in bytes to allocate.</p></ol>
241 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
242 _8c.html" target="source" name="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
243 <div class="doc-section">
245 <p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p></ol>
247 <p>The format of the GetMagickMemoryMethods() method is:</p>
250 void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
251 ResizeMemoryHandler *resize_memory_handler,
252 DestroyMemoryHandler *destroy_memory_handler)
255 <p>A description of each parameter follows:</p></ol>
257 <h5>acquire_memory_handler</h5>
258 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
260 <h5>resize_memory_handler</h5>
261 <ol><p>method to resize memory (e.g. realloc).</p></ol>
263 <h5>destroy_memory_handler</h5>
264 <ol><p>method to destroy memory (e.g. free).</p></ol>
267 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
268 _8c.html" target="source" name="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>
269 <div class="doc-section">
271 <p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p></ol>
273 <p>The format of the RelinquishAlignedMemory method is:</p>
276 void *RelinquishAlignedMemory(void *memory)
279 <p>A description of each parameter follows:</p></ol>
282 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
285 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
286 _8c.html" target="source" name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
287 <div class="doc-section">
289 <p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p></ol>
291 <p>The format of the RelinquishMagickMemory method is:</p>
294 void *RelinquishMagickMemory(void *memory)
297 <p>A description of each parameter follows:</p></ol>
300 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
303 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
304 _8c.html" target="source" name="ResetMagickMemory">ResetMagickMemory</a></h2>
305 <div class="doc-section">
307 <p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p></ol>
309 <p>The format of the ResetMagickMemory method is:</p>
312 void *ResetMagickMemory(void *memory,int byte,const size_t size)
315 <p>A description of each parameter follows:</p></ol>
318 <ol><p>A pointer to a memory allocation.</p></ol>
321 <ol><p>Set the memory to this value.</p></ol>
324 <ol><p>Size of the memory to reset.</p></ol>
327 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
328 _8c.html" target="source" name="ResizeMagickMemory">ResizeMagickMemory</a></h2>
329 <div class="doc-section">
331 <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>
333 <p>The format of the ResizeMagickMemory method is:</p>
336 void *ResizeMagickMemory(void *memory,const size_t size)
339 <p>A description of each parameter follows:</p></ol>
342 <ol><p>A pointer to a memory allocation.</p></ol>
345 <ol><p>the new size of the allocated memory.</p></ol>
348 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
349 _8c.html" target="source" name="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
350 <div class="doc-section">
352 <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>
354 <p>The format of the ResizeQuantumMemory method is:</p>
357 void *ResizeQuantumMemory(void *memory,const size_t count,
358 const size_t quantum)
361 <p>A description of each parameter follows:</p></ol>
364 <ol><p>A pointer to a memory allocation.</p></ol>
367 <ol><p>the number of quantum elements to allocate.</p></ol>
370 <ol><p>the number of bytes in each quantum.</p></ol>
373 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
374 _8c.html" target="source" name="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
375 <div class="doc-section">
377 <p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p></ol>
379 <p>The format of the SetMagickMemoryMethods() method is:</p>
382 SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
383 ResizeMemoryHandler resize_memory_handler,
384 DestroyMemoryHandler destroy_memory_handler)
387 <p>A description of each parameter follows:</p></ol>
389 <h5>acquire_memory_handler</h5>
390 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
392 <h5>resize_memory_handler</h5>
393 <ol><p>method to resize memory (e.g. realloc).</p></ol>
395 <h5>destroy_memory_handler</h5>
396 <ol><p>method to destroy memory (e.g. free).</p></ol>
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