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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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50
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194
195<div class="main">
196
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]197<h1>MagickCore C API</h1>
198
199<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]200
201<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>
202
203<ul>
204 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
205 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
206 <li><a href="../www/api/composite.html">Composite an Image</a></li>
207 <li><a href="../www/api/image.html">Image Methods</a></li>
208 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]209 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210 <li><a href="../www/api/distort.html">Image Distortions</a></li>
211 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
212 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
213 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
214 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
215 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
216 <li><a href="../www/api/resize.html">Resize an Image</a></li>
217 <li><a href="../www/api/transform.html">Transform an Image</a></li>
218 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
219 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
220 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]221 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
223 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]224 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]226 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
227 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
229 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
230 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
231 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
232 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
233 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
234 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
235 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
236 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
237 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]238 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]239 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
240 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
241 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
242 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
243 <li><a href="../www/api/module.html">Loadable Modules</a></li>
244 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
245 <li><a href="../www/api/registry.html">The Image Registry</a></li>
246 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
247 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
248 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
249 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
250 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
251 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
252 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
253</ul>
254
255<p>After you write your MagickCore program, compile it like this:</p>
256
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]257<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]258<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>
259
260<div class="viewport">
261<pre class="code">
262 #include &lt;stdio.h>
263 #include &lt;stdlib.h>
264 #include &lt;string.h>
265 #include &lt;time.h>
266 #include &lt;magick/MagickCore.h>
267
268 int main(int argc,char **argv)
269 {
270 ExceptionInfo
271 *exception;
272
273 Image
274 *image,
275 *images,
276 *resize_image,
277 *thumbnails;
278
279 ImageInfo
280 *image_info;
281
282 if (argc != 3)
283 {
284 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
285 exit(0);
286 }
287 /*
288 Initialize the image info structure and read an image.
289 */
290 MagickCoreGenesis(*argv,MagickTrue);
291 exception=AcquireExceptionInfo();
292 image_info=CloneImageInfo((ImageInfo *) NULL);
293 (void) strcpy(image_info-&gt;filename,argv[1]);
294 images=ReadImage(image_info,exception);
295 if (exception-&gt;severity != UndefinedException)
296 CatchException(exception);
297 if (images == (Image *) NULL)
298 exit(1);
299 /*
300 Convert the image to a thumbnail.
301 */
302 thumbnails=NewImageList();
303 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
304 {
305 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
306 if (resize_image == (Image *) NULL)
307 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
308 (void) AppendImageToList(&amp;thumbnails,resize_image);
309 DestroyImage(image);
310 }
311 /*
312 Write the image thumbnail.
313 */
314 (void) strcpy(thumbnails-&gt;filename,argv[2]);
315 WriteImage(image_info,thumbnails);
316 /*
317 Destroy the image thumbnail and exit.
318 */
319 thumbnails=DestroyImageList(thumbnails);
320 image_info=DestroyImageInfo(image_info);
321 exception=DestroyExceptionInfo(exception);
322 MagickCoreTerminus();
323 return(0);
324 }
325</pre>
326</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]327<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]328
329<div class="viewport">
330<pre class="code">
331#include &lt;stdio.h>
332#include &lt;stdlib.h>
333#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]334#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]335
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]336static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]337 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]338{
339#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
340#define SigmoidalContrast(x) \
341 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
342
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]343 RectangleInfo
344 extent;
345
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]346 register IndexPacket
347 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]348
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]349 register PixelPacket
350 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]351
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]352 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]353 x;
354
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]355 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]356 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]357 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]358 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]359 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
360 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
361 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
362 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]363 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]364 indexes=GetImageViewAuthenticIndexes(contrast_view);
365 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]366 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]367 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]368 return(MagickTrue);
369}
370
371int main(int argc,char **argv)
372{
373#define ThrowImageException(image) \
374{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]375 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]376 CatchException(exception); \
377 if (contrast_image != (Image *) NULL) \
378 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]379 exit(-1); \
380}
381#define ThrowViewException(view) \
382{ \
383 char \
384 *description; \
385 \
386 ExceptionType \
387 severity; \
388 \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]389 description=GetImageViewException(view,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]390 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
391 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]392 exit(-1); \
393}
394
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]395 ExceptionInfo
396 *exception;
397
398 Image
399 *contrast_image;
400
401 ImageInfo
402 *image_info;
403
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]404 ImageView
405 *contrast_view;
406
407 MagickBooleanType
408 status;
409
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]410 if (argc != 3)
411 {
412 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
413 exit(0);
414 }
415 /*
416 Read an image.
417 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]418 MagickCoreGenesis(*argv,MagickTrue);
419 image_info=AcquireImageInfo();
420 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
421 exception=AcquireExceptionInfo();
422 contrast_image=ReadImage(image_info,exception);
423 if (contrast_image == (Image *) NULL)
424 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]425 /*
426 Sigmoidal non-linearity contrast control.
427 */
428 contrast_view=NewImageView(contrast_image);
429 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]430 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]431 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
432 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]433 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]434 contrast_view=DestroyImageView(contrast_view);
435 /*
436 Write the image then destroy it.
437 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]438 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]439 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]440 ThrowImageException(contrast_image);
441 contrast_image=DestroyImage(contrast_image);
442 exception=DestroyExceptionInfo(exception);
443 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]444 MagickCoreTerminus();
445 return(0);
446}
447</pre>
448</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]449</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]450
451</div>
452
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cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]454 <span id="linkbar-west">&nbsp;</span>
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