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gerrit-public.fairphone.software / platform / external / ImageMagick / 68169a5b02e5d2b36003f4cc0db02a8fabf26c77 / . / www / magick-core.html
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]12 <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title>
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cristye6e84152011-06-06 14:16:49 +0000[diff] [blame]17 <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."/>
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]51</head>
52
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114<div class="sub">
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204</div>
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212
213<div class="main">
214
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]215<h1>MagickCore C API</h1>
216
217<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218
219<p>The <a href="../www/api/MagickCore/index.html">MagickCore API</a> is a low-level interface between the C programming language and the ImageMagick image processing libraries and is recommended for wizard-level programmers only. Unlike the <a href="../www/magick-wand.html">MagickWand</a> C API which uses only a few opaque types and accessors, with MagickCore you almost exlusively access the structure members directly. A description of the MagickCore public methods are found here:</p>
220
221<ul>
222 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
223 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
224 <li><a href="../www/api/composite.html">Composite an Image</a></li>
225 <li><a href="../www/api/image.html">Image Methods</a></li>
226 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]227 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228 <li><a href="../www/api/distort.html">Image Distortions</a></li>
229 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
230 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
231 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
232 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
233 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
234 <li><a href="../www/api/resize.html">Resize an Image</a></li>
235 <li><a href="../www/api/transform.html">Transform an Image</a></li>
236 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
237 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
238 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]239 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]240 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
241 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]242 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]243 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]244 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
245 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]246 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
247 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
248 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
249 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
250 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
251 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
252 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
253 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
254 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
255 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]256 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]257 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
258 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
259 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
260 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
261 <li><a href="../www/api/module.html">Loadable Modules</a></li>
262 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
263 <li><a href="../www/api/registry.html">The Image Registry</a></li>
264 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
265 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
266 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
267 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
268 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
269 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
270 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
271</ul>
272
273<p>After you write your MagickCore program, compile it like this:</p>
274
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]275<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>cc `MagickCore-config --cflags --cppflags` -O2 core.c \ <br/> `MagickCore-config --ldflags --libs`</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]276<p>Here is a example program that utilizes the MagickCore API to get you started, <a href="../www/source/core.c">core.c</a>. It reads a GIF image, creates a thumbnail, and writes it to disk in the PNG image format.</p>
277
278<div class="viewport">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279 #include &lt;stdio.h>
280 #include &lt;stdlib.h>
281 #include &lt;string.h>
282 #include &lt;time.h>
283 #include &lt;magick/MagickCore.h>
284
285 int main(int argc,char **argv)
286 {
287 ExceptionInfo
288 *exception;
289
290 Image
291 *image,
292 *images,
293 *resize_image,
294 *thumbnails;
295
296 ImageInfo
297 *image_info;
298
299 if (argc != 3)
300 {
301 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
302 exit(0);
303 }
304 /*
305 Initialize the image info structure and read an image.
306 */
307 MagickCoreGenesis(*argv,MagickTrue);
308 exception=AcquireExceptionInfo();
309 image_info=CloneImageInfo((ImageInfo *) NULL);
310 (void) strcpy(image_info-&gt;filename,argv[1]);
311 images=ReadImage(image_info,exception);
312 if (exception-&gt;severity != UndefinedException)
313 CatchException(exception);
314 if (images == (Image *) NULL)
315 exit(1);
316 /*
317 Convert the image to a thumbnail.
318 */
319 thumbnails=NewImageList();
320 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
321 {
322 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
323 if (resize_image == (Image *) NULL)
324 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
325 (void) AppendImageToList(&amp;thumbnails,resize_image);
326 DestroyImage(image);
327 }
328 /*
329 Write the image thumbnail.
330 */
331 (void) strcpy(thumbnails-&gt;filename,argv[2]);
332 WriteImage(image_info,thumbnails);
333 /*
334 Destroy the image thumbnail and exit.
335 */
336 thumbnails=DestroyImageList(thumbnails);
337 image_info=DestroyImageInfo(image_info);
338 exception=DestroyExceptionInfo(exception);
339 MagickCoreTerminus();
340 return(0);
341 }
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]342</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]343<p><a id="image-view"></a>Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views. The <a href="../www/source/core/sigmoidal-contrast.c">sigmoidal-contrast.c</a> module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]344
345<div class="viewport">
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]346#include &lt;stdio.h>
347#include &lt;stdlib.h>
348#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]349#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]350
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]351static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]352 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]353{
354#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
355#define SigmoidalContrast(x) \
356 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
357
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]358 RectangleInfo
359 extent;
360
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]361 register IndexPacket
362 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]363
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]364 register PixelPacket
365 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]366
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]367 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]368 x;
369
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]370 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]371 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]372 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]373 {
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame]374 SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
375 SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
376 SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
377 SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
cristyacc04882011-05-04 23:03:43 +0000[diff] [blame]378 pixels++;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]379 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]380 indexes=GetImageViewAuthenticIndexes(contrast_view);
381 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]382 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame]383 SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]384 return(MagickTrue);
385}
386
387int main(int argc,char **argv)
388{
389#define ThrowImageException(image) \
390{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]391 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]392 CatchException(exception); \
393 if (contrast_image != (Image *) NULL) \
394 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]395 exit(-1); \
396}
397#define ThrowViewException(view) \
398{ \
399 char \
400 *description; \
401 \
402 ExceptionType \
403 severity; \
404 \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]405 description=GetImageViewException(view,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]406 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
407 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]408 exit(-1); \
409}
410
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]411 ExceptionInfo
412 *exception;
413
414 Image
415 *contrast_image;
416
417 ImageInfo
418 *image_info;
419
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]420 ImageView
421 *contrast_view;
422
423 MagickBooleanType
424 status;
425
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]426 if (argc != 3)
427 {
428 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
429 exit(0);
430 }
431 /*
432 Read an image.
433 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]434 MagickCoreGenesis(*argv,MagickTrue);
435 image_info=AcquireImageInfo();
436 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
437 exception=AcquireExceptionInfo();
438 contrast_image=ReadImage(image_info,exception);
439 if (contrast_image == (Image *) NULL)
440 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]441 /*
442 Sigmoidal non-linearity contrast control.
443 */
444 contrast_view=NewImageView(contrast_image);
445 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]446 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]447 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
448 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]449 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]450 contrast_view=DestroyImageView(contrast_view);
451 /*
452 Write the image then destroy it.
453 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]454 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]455 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]456 ThrowImageException(contrast_image);
457 contrast_image=DestroyImage(contrast_image);
458 exception=DestroyExceptionInfo(exception);
459 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]460 MagickCoreTerminus();
461 return(0);
462}
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]463</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]464</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]465
466</div>
467
468<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]469 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]470 <span id="linkbar-center">
471 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]472 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]473 </span>
474 <span id="linkbar-east">&nbsp;</span>
475 </div>
476 <div class="footer">
cristy7e41fe82010-12-04 23:12:08 +0000[diff] [blame]477 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]478 <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
479 </div>
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