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gerrit-public.fairphone.software / platform / external / ImageMagick / c0dfcb09ebf5718c1eaf6a254ec74d8524da5a2d / . / www / api / memory.html
blob: 8915050da24941bf4a3921c2a75c58e7f05d01f5 [file] [log] [blame]
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]3<html version="-//W3C//DTD XHTML 1.1//EN"
4 xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6 xsi:schemaLocation="http://www.w3.org/1999/xhtml
7 http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]8<head>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]9 <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
cristy1efc1ab2011-08-01 14:47:02 +0000[diff] [blame]10 <meta name="google-site-verification" content="MxsMq6bdLOx0KSuz1MY6yG9ZTIJ7_7DVRfl5NCAT5Yg"/>
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Memory Allocation</title>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]12 <meta http-equiv="content-language" content="en-US"/>
13 <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
14 <meta http-equiv="reply-to" content="magick-users@imagemagick.org"/>
15 <meta name="application-name" content="ImageMagick"/>
16 <meta name="description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images automagically."/>
17 <meta name="application-url" content="http://www.imagemagick.org"/>
18 <meta name="generator" content="PHP"/>
19 <meta name="keywords" content="magickcore, c, api, for, imagemagick:, memory, allocation, ImageMagick, PerlMagick, image processing, OpenMP, software development library, image, photo, software, Magick++, MagickWand"/>
20 <meta name="rating" content="GENERAL"/>
21 <meta name="robots" content="INDEX, FOLLOW"/>
22 <meta name="generator" content="ImageMagick Studio LLC"/>
23 <meta name="author" content="ImageMagick Studio LLC"/>
24 <meta name="revisit-after" content="2 DAYS"/>
25 <meta name="resource-type" content="document"/>
26 <meta name="copyright" content="Copyright (c) 1999-2012 ImageMagick Studio LLC"/>
27 <meta name="distribution" content="Global"/>
cristy99084a42012-08-04 16:51:41 +0000[diff] [blame]28 <link rel="icon" href="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../images/wand.png"/>
29 <link rel="shortcut icon" href="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../images/wand.ico" type="images/x-icon"/>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame]30 <link rel="canonical" href="http://www.imagemagick.org" />
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]31 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]32 <!-- Add jQuery library -->
33 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
34
35 <!-- Optionaly include easing and/or mousewheel plugins -->
36 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.easing-1.3.pack.js"></script>
37 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.mousewheel-3.0.6.pack.js"></script>
38
39 <!-- Add fancyBox -->
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]40 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/jquery.fancybox.css?v=2.0.4" type="text/css" media="screen" />
41 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.fancybox.pack.js?v=2.0.4"></script>
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]42
43 <!-- Optionaly include button and/or thumbnail helpers -->
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]44 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.css?v=2.0.4" type="text/css" media="screen" />
45 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.js?v=2.0.4"></script>
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]46
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]47 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.css?v=2.0.4" type="text/css" media="screen" />
48 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.js?v=2.0.4"></script>
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]49 <script type="text/javascript">
50 $(document).ready(function() {
51 $(".fancybox").fancybox();
52 });
53 </script>
54 <!-- ImageMagick style -->
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]55 <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]56 <style type="text/css" media="all">
cristy99084a42012-08-04 16:51:41 +0000[diff] [blame]57 @import url("../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../www/magick.css");
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]58 </style>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]59</head>
60
61<body id="www-imagemagick-org">
62<div class="titlebar">
cristyb52981c2011-03-19 17:09:31 +0000[diff] [blame]63<div style="margin: 17px auto; float: left;">
64 <script type="text/javascript">
65 <!--
66 google_ad_client = "pub-3129977114552745";
67 google_ad_slot = "5439289906";
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69 google_ad_height = 90;
70 //-->
71 </script>
72 <script type="text/javascript"
73 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
74 </script>
75</div>
cristy99084a42012-08-04 16:51:41 +0000[diff] [blame]76<a href="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../discourse-server">
77 <img src="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../images/logo.jpg"
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]78 alt="ImageMagick Logo"
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]79 style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
cristy99084a42012-08-04 16:51:41 +0000[diff] [blame]80<a href="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../index.html">
81 <img src="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../images/sprite.jpg"
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]82 alt="ImageMagick Sprite"
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]83 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
84</div>
85
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238
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]239<h1>Module memory Methods</h1>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]240<p class="navigation-index">[<a href="memory.html#AcquireAlignedMemory">AcquireAlignedMemory</a> &bull; <a href="memory.html#AcquireMagickMemory">AcquireMagickMemory</a> &bull; <a href="memory.html#AcquireQuantumMemory">AcquireQuantumMemory</a> &bull; <a href="memory.html#CopyMagickMemory">CopyMagickMemory</a> &bull; <a href="memory.html#GetMagickMemoryMethods">GetMagickMemoryMethods</a> &bull; <a href="memory.html#RelinquishAlignedMemory">RelinquishAlignedMemory</a> &bull; <a href="memory.html#RelinquishMagickMemory">RelinquishMagickMemory</a> &bull; <a href="memory.html#ResetMagickMemory">ResetMagickMemory</a> &bull; <a href="memory.html#ResizeMagickMemory">ResizeMagickMemory</a> &bull; <a href="memory.html#ResizeQuantumMemory">ResizeQuantumMemory</a> &bull; <a href="memory.html#SetMagickMemoryMethods">SetMagickMemoryMethods</a>]</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]241
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]242<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireAlignedMemory">AcquireAlignedMemory</a></h2>
243<div class="doc-section">
244
245<p>AcquireAlignedMemory() returns a pointer to a block of memory at least size bytes whose address is a multiple of 16*sizeof(void *).</p>
246
247<p>The format of the AcquireAlignedMemory method is:</p>
248
249<pre class="code">
250 void *AcquireAlignedMemory(const size_t count,const size_t quantum)
251</pre>
252
253<p>A description of each parameter follows:</p>
254
255<h5>count</h5>
256<p>the number of quantum elements to allocate.</p>
257
258<h5>quantum</h5>
259<p>the number of bytes in each quantum.</p>
260
261 </div>
262<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireMagickMemory">AcquireMagickMemory</a></h2>
263<div class="doc-section">
264
265<p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p>
266
267<p>The format of the AcquireMagickMemory method is:</p>
268
269<pre class="code">
270 void *AcquireMagickMemory(const size_t size)
271</pre>
272
273<p>A description of each parameter follows:</p>
274
275<h5>size</h5>
276<p>the size of the memory in bytes to allocate.</p>
277
278 </div>
279<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="AcquireQuantumMemory">AcquireQuantumMemory</a></h2>
280<div class="doc-section">
281
282<p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p>
283
284<p>The format of the AcquireQuantumMemory method is:</p>
285
286<pre class="code">
287 void *AcquireQuantumMemory(const size_t count,const size_t quantum)
288</pre>
289
290<p>A description of each parameter follows:</p>
291
292<h5>count</h5>
293<p>the number of quantum elements to allocate.</p>
294
295<h5>quantum</h5>
296<p>the number of bytes in each quantum.</p>
297
298 </div>
299<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="CopyMagickMemory">CopyMagickMemory</a></h2>
300<div class="doc-section">
301
302<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>
303
304<p>The format of the CopyMagickMemory method is:</p>
305
306<pre class="code">
307 void *CopyMagickMemory(void *destination,const void *source,
308 const size_t size)
309</pre>
310
311<p>A description of each parameter follows:</p>
312
313<h5>destination</h5>
314<p>the destination.</p>
315
316<h5>source</h5>
317<p>the source.</p>
318
319<h5>size</h5>
320<p>the size of the memory in bytes to allocate.</p>
321
322 </div>
323<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2>
324<div class="doc-section">
325
326<p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p>
327
328<p>The format of the GetMagickMemoryMethods() method is:</p>
329
330<pre class="code">
331 void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler,
332 ResizeMemoryHandler *resize_memory_handler,
333 DestroyMemoryHandler *destroy_memory_handler)
334</pre>
335
336<p>A description of each parameter follows:</p>
337
338<h5>acquire_memory_handler</h5>
339<p>method to acquire memory (e.g. malloc).</p>
340
341<h5>resize_memory_handler</h5>
342<p>method to resize memory (e.g. realloc).</p>
343
344<h5>destroy_memory_handler</h5>
345<p>method to destroy memory (e.g. free).</p>
346
347 </div>
348<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2>
349<div class="doc-section">
350
351<p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p>
352
353<p>The format of the RelinquishAlignedMemory method is:</p>
354
355<pre class="code">
356 void *RelinquishAlignedMemory(void *memory)
357</pre>
358
359<p>A description of each parameter follows:</p>
360
361<h5>memory</h5>
362<p>A pointer to a block of memory to free for reuse.</p>
363
364 </div>
365<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="RelinquishMagickMemory">RelinquishMagickMemory</a></h2>
366<div class="doc-section">
367
368<p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p>
369
370<p>The format of the RelinquishMagickMemory method is:</p>
371
372<pre class="code">
373 void *RelinquishMagickMemory(void *memory)
374</pre>
375
376<p>A description of each parameter follows:</p>
377
378<h5>memory</h5>
379<p>A pointer to a block of memory to free for reuse.</p>
380
381 </div>
382<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResetMagickMemory">ResetMagickMemory</a></h2>
383<div class="doc-section">
384
385<p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p>
386
387<p>The format of the ResetMagickMemory method is:</p>
388
389<pre class="code">
390 void *ResetMagickMemory(void *memory,int byte,const size_t size)
391</pre>
392
393<p>A description of each parameter follows:</p>
394
395<h5>memory</h5>
396<p>A pointer to a memory allocation.</p>
397
398<h5>byte</h5>
399<p>Set the memory to this value.</p>
400
401<h5>size</h5>
402<p>Size of the memory to reset.</p>
403
404 </div>
405<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResizeMagickMemory">ResizeMagickMemory</a></h2>
406<div class="doc-section">
407
408<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>
409
410<p>The format of the ResizeMagickMemory method is:</p>
411
412<pre class="code">
413 void *ResizeMagickMemory(void *memory,const size_t size)
414</pre>
415
416<p>A description of each parameter follows:</p>
417
418<h5>memory</h5>
419<p>A pointer to a memory allocation.</p>
420
421<h5>size</h5>
422<p>the new size of the allocated memory.</p>
423
424 </div>
425<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="ResizeQuantumMemory">ResizeQuantumMemory</a></h2>
426<div class="doc-section">
427
428<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>
429
430<p>The format of the ResizeQuantumMemory method is:</p>
431
432<pre class="code">
433 void *ResizeQuantumMemory(void *memory,const size_t count,
434 const size_t quantum)
435</pre>
436
437<p>A description of each parameter follows:</p>
438
439<h5>memory</h5>
440<p>A pointer to a memory allocation.</p>
441
442<h5>count</h5>
443<p>the number of quantum elements to allocate.</p>
444
445<h5>quantum</h5>
446<p>the number of bytes in each quantum.</p>
447
448 </div>
449<h2><a href="http://www.imagemagick.org/api/MagickCore/memory_8c.html" id="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2>
450<div class="doc-section">
451
452<p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory.</p>
453
454<p>The format of the SetMagickMemoryMethods() method is:</p>
455
456<pre class="code">
457 SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler,
458 ResizeMemoryHandler resize_memory_handler,
459 DestroyMemoryHandler destroy_memory_handler)
460</pre>
461
462<p>A description of each parameter follows:</p>
463
464<h5>acquire_memory_handler</h5>
465<p>method to acquire memory (e.g. malloc).</p>
466
467<h5>resize_memory_handler</h5>
468<p>method to resize memory (e.g. realloc).</p>
469
470<h5>destroy_memory_handler</h5>
471<p>method to destroy memory (e.g. free).</p>
472
473 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]474
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