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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
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155 <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>
157 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
158 _8c.html" target="source" name="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>
159 <div class="doc-section">
161 <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>
163 <p>The format of the AcquireAlignedMemory method is:</p>
166 void *AcquireAlignedMemory(const size_t count,const size_t quantum)
169 <p>A description of each parameter follows:</p></ol>
172 <ol><p>the number of quantum elements to allocate.</p></ol>
175 <ol><p>the number of bytes in each quantum.</p></ol>
178 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
179 _8c.html" target="source" name="AcquireMagickMemory">AcquireMagickMemory</a></h2>
180 <div class="doc-section">
182 <p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p></ol>
184 <p>The format of the AcquireMagickMemory method is:</p>
187 void *AcquireMagickMemory(const size_t size)
190 <p>A description of each parameter follows:</p></ol>
193 <ol><p>the size of the memory in bytes to allocate.</p></ol>
196 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
197 _8c.html" target="source" name="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
198 <div class="doc-section">
200 <p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p></ol>
202 <p>The format of the AcquireQuantumMemory method is:</p>
205 void *AcquireQuantumMemory(const size_t count,const size_t quantum)
208 <p>A description of each parameter follows:</p></ol>
211 <ol><p>the number of quantum elements to allocate.</p></ol>
214 <ol><p>the number of bytes in each quantum.</p></ol>
217 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
218 _8c.html" target="source" name="CopyMagickMemory">CopyMagickMemory</a></h2>
219 <div class="doc-section">
221 <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>
223 <p>The format of the CopyMagickMemory method is:</p>
226 void *CopyMagickMemory(void *destination,const void *source,
230 <p>A description of each parameter follows:</p></ol>
233 <ol><p>the destination.</p></ol>
236 <ol><p>the source.</p></ol>
239 <ol><p>the size of the memory in bytes to allocate.</p></ol>
242 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
243 _8c.html" target="source" name="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
244 <div class="doc-section">
246 <p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p></ol>
248 <p>The format of the GetMagickMemoryMethods() method is:</p>
251 void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
252 ResizeMemoryHandler *resize_memory_handler,
253 DestroyMemoryHandler *destroy_memory_handler)
256 <p>A description of each parameter follows:</p></ol>
258 <h5>acquire_memory_handler</h5>
259 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
261 <h5>resize_memory_handler</h5>
262 <ol><p>method to resize memory (e.g. realloc).</p></ol>
264 <h5>destroy_memory_handler</h5>
265 <ol><p>method to destroy memory (e.g. free).</p></ol>
268 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
269 _8c.html" target="source" name="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>
270 <div class="doc-section">
272 <p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p></ol>
274 <p>The format of the RelinquishAlignedMemory method is:</p>
277 void *RelinquishAlignedMemory(void *memory)
280 <p>A description of each parameter follows:</p></ol>
283 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
286 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
287 _8c.html" target="source" name="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
288 <div class="doc-section">
290 <p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p></ol>
292 <p>The format of the RelinquishMagickMemory method is:</p>
295 void *RelinquishMagickMemory(void *memory)
298 <p>A description of each parameter follows:</p></ol>
301 <ol><p>A pointer to a block of memory to free for reuse.</p></ol>
304 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
305 _8c.html" target="source" name="ResetMagickMemory">ResetMagickMemory</a></h2>
306 <div class="doc-section">
308 <p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p></ol>
310 <p>The format of the ResetMagickMemory method is:</p>
313 void *ResetMagickMemory(void *memory,int byte,const size_t size)
316 <p>A description of each parameter follows:</p></ol>
319 <ol><p>A pointer to a memory allocation.</p></ol>
322 <ol><p>Set the memory to this value.</p></ol>
325 <ol><p>Size of the memory to reset.</p></ol>
328 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
329 _8c.html" target="source" name="ResizeMagickMemory">ResizeMagickMemory</a></h2>
330 <div class="doc-section">
332 <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>
334 <p>The format of the ResizeMagickMemory method is:</p>
337 void *ResizeMagickMemory(void *memory,const size_t size)
340 <p>A description of each parameter follows:</p></ol>
343 <ol><p>A pointer to a memory allocation.</p></ol>
346 <ol><p>the new size of the allocated memory.</p></ol>
349 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
350 _8c.html" target="source" name="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
351 <div class="doc-section">
353 <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>
355 <p>The format of the ResizeQuantumMemory method is:</p>
358 void *ResizeQuantumMemory(void *memory,const size_t count,
359 const size_t quantum)
362 <p>A description of each parameter follows:</p></ol>
365 <ol><p>A pointer to a memory allocation.</p></ol>
368 <ol><p>the number of quantum elements to allocate.</p></ol>
371 <ol><p>the number of bytes in each quantum.</p></ol>
374 <h2><a href="http://www.imagemagick.org/api/MagickCore/memory
375 _8c.html" target="source" name="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
376 <div class="doc-section">
378 <p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p></ol>
380 <p>The format of the SetMagickMemoryMethods() method is:</p>
383 SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
384 ResizeMemoryHandler resize_memory_handler,
385 DestroyMemoryHandler destroy_memory_handler)
388 <p>A description of each parameter follows:</p></ol>
390 <h5>acquire_memory_handler</h5>
391 <ol><p>method to acquire memory (e.g. malloc).</p></ol>
393 <h5>resize_memory_handler</h5>
394 <ol><p>method to resize memory (e.g. realloc).</p></ol>
396 <h5>destroy_memory_handler</h5>
397 <ol><p>method to destroy memory (e.g. free).</p></ol>
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