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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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197
198<div class="main">
199
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]200<h1>MagickCore C API</h1>
201
202<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203
204<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>
205
206<ul>
207 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
208 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
209 <li><a href="../www/api/composite.html">Composite an Image</a></li>
210 <li><a href="../www/api/image.html">Image Methods</a></li>
211 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]212 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213 <li><a href="../www/api/distort.html">Image Distortions</a></li>
214 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
215 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
216 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
217 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
218 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
219 <li><a href="../www/api/resize.html">Resize an Image</a></li>
220 <li><a href="../www/api/transform.html">Transform an Image</a></li>
221 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
222 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
223 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]224 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
226 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]227 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]229 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
230 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]231 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
232 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
233 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
234 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
235 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
236 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
237 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
238 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
239 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
240 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]241 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
243 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
244 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
245 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
246 <li><a href="../www/api/module.html">Loadable Modules</a></li>
247 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
248 <li><a href="../www/api/registry.html">The Image Registry</a></li>
249 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
250 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
251 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
252 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
253 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
254 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
255 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
256</ul>
257
258<p>After you write your MagickCore program, compile it like this:</p>
259
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]260<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]261<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>
262
263<div class="viewport">
264<pre class="code">
265 #include &lt;stdio.h>
266 #include &lt;stdlib.h>
267 #include &lt;string.h>
268 #include &lt;time.h>
269 #include &lt;magick/MagickCore.h>
270
271 int main(int argc,char **argv)
272 {
273 ExceptionInfo
274 *exception;
275
276 Image
277 *image,
278 *images,
279 *resize_image,
280 *thumbnails;
281
282 ImageInfo
283 *image_info;
284
285 if (argc != 3)
286 {
287 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
288 exit(0);
289 }
290 /*
291 Initialize the image info structure and read an image.
292 */
293 MagickCoreGenesis(*argv,MagickTrue);
294 exception=AcquireExceptionInfo();
295 image_info=CloneImageInfo((ImageInfo *) NULL);
296 (void) strcpy(image_info-&gt;filename,argv[1]);
297 images=ReadImage(image_info,exception);
298 if (exception-&gt;severity != UndefinedException)
299 CatchException(exception);
300 if (images == (Image *) NULL)
301 exit(1);
302 /*
303 Convert the image to a thumbnail.
304 */
305 thumbnails=NewImageList();
306 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
307 {
308 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
309 if (resize_image == (Image *) NULL)
310 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
311 (void) AppendImageToList(&amp;thumbnails,resize_image);
312 DestroyImage(image);
313 }
314 /*
315 Write the image thumbnail.
316 */
317 (void) strcpy(thumbnails-&gt;filename,argv[2]);
318 WriteImage(image_info,thumbnails);
319 /*
320 Destroy the image thumbnail and exit.
321 */
322 thumbnails=DestroyImageList(thumbnails);
323 image_info=DestroyImageInfo(image_info);
324 exception=DestroyExceptionInfo(exception);
325 MagickCoreTerminus();
326 return(0);
327 }
328</pre>
329</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]330<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]331
332<div class="viewport">
333<pre class="code">
334#include &lt;stdio.h>
335#include &lt;stdlib.h>
336#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]337#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]338
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]339static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]340 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]341{
342#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
343#define SigmoidalContrast(x) \
344 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
345
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]346 RectangleInfo
347 extent;
348
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]349 register IndexPacket
350 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]351
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]352 register PixelPacket
353 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]354
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]355 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]356 x;
357
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]358 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]359 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]360 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]361 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]362 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
363 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
364 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
365 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]366 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]367 indexes=GetImageViewAuthenticIndexes(contrast_view);
368 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]369 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]370 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]371 return(MagickTrue);
372}
373
374int main(int argc,char **argv)
375{
376#define ThrowImageException(image) \
377{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]378 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]379 CatchException(exception); \
380 if (contrast_image != (Image *) NULL) \
381 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]382 exit(-1); \
383}
384#define ThrowViewException(view) \
385{ \
386 char \
387 *description; \
388 \
389 ExceptionType \
390 severity; \
391 \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]392 description=GetImageViewException(view,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]393 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
394 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]395 exit(-1); \
396}
397
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]398 ExceptionInfo
399 *exception;
400
401 Image
402 *contrast_image;
403
404 ImageInfo
405 *image_info;
406
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]407 ImageView
408 *contrast_view;
409
410 MagickBooleanType
411 status;
412
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]413 if (argc != 3)
414 {
415 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
416 exit(0);
417 }
418 /*
419 Read an image.
420 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]421 MagickCoreGenesis(*argv,MagickTrue);
422 image_info=AcquireImageInfo();
423 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
424 exception=AcquireExceptionInfo();
425 contrast_image=ReadImage(image_info,exception);
426 if (contrast_image == (Image *) NULL)
427 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]428 /*
429 Sigmoidal non-linearity contrast control.
430 */
431 contrast_view=NewImageView(contrast_image);
432 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]433 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]434 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
435 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]436 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]437 contrast_view=DestroyImageView(contrast_view);
438 /*
439 Write the image then destroy it.
440 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]441 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]442 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]443 ThrowImageException(contrast_image);
444 contrast_image=DestroyImage(contrast_image);
445 exception=DestroyExceptionInfo(exception);
446 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]447 MagickCoreTerminus();
448 return(0);
449}
450</pre>
451</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]452</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]453
454</div>
455
456<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]457 <span id="linkbar-west">&nbsp;</span>
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459 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]460 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
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463 </div>
464 <div class="footer">
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