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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
51<body id="www-imagemagick-org">
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191
192<div class="main">
193
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]194<h1>MagickCore C API</h1>
195
196<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]197
198<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>
199
200<ul>
201 <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
202 <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
203 <li><a href="../www/api/composite.html">Composite an Image</a></li>
204 <li><a href="../www/api/image.html">Image Methods</a></li>
205 <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
cristy43d0f4d2009-09-17 19:35:37 +0000[diff] [blame]206 <li><a href="../www/api/colormap.html">Colormap Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]207 <li><a href="../www/api/distort.html">Image Distortions</a></li>
208 <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
209 <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
210 <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
211 <li><a href="../www/api/histogram.html">Image Histograms</a></li>
212 <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
213 <li><a href="../www/api/resize.html">Resize an Image</a></li>
214 <li><a href="../www/api/transform.html">Transform an Image</a></li>
215 <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
216 <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
217 <li><a href="../www/api/effect.html">Add an Effect</a></li>
cristyd43a46b2010-01-21 02:13:41 +0000[diff] [blame]218 <li><a href="../www/api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]219 <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
220 <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
cristy83543962009-10-16 19:04:28 +0000[diff] [blame]221 <li><a href="../www/api/attribute.html">Get/Set an Image Attribute</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222 <li><a href="../www/api/property.html">Get/Set Image Properties</a></li>
cristy3e2860c2010-01-24 01:36:30 +0000[diff] [blame]223 <li><a href="../www/api/statistic.html">Get Image Statistics</a></li>
224 <li><a href="../www/api/feature.html">Get Image Features</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225 <li><a href="../www/api/annotate.html">Annotate an Image</a></li>
226 <li><a href="../www/api/paint.html">Paint on an Image</a></li>
227 <li><a href="../www/api/draw.html">Draw on an Image</a></li>
228 <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
229 <li><a href="../www/api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
230 <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
231 <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
232 <li><a href="../www/api/animate.html">Interactively Animate an Image Sequence</a></li>
233 <li><a href="../www/api/cipher.html">Convert to and from Cipher Pixels</a></li>
234 <li><a href="../www/api/list.html">Working with Image Lists</a></li>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]235 <li><a href="../www/api/image-view.html">Image View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236 <li><a href="../www/api/cache.html">Get or Set Image Pixels</a></li>
237 <li><a href="../www/api/cache-view.html">Working with Cache Views</a></li>
238 <li><a href="../www/api/stream.html">The Pixel FIFO</a></li>
239 <li><a href="../www/api/blob.html">Read or Write Binary Large OBjects</a></li>
240 <li><a href="../www/api/module.html">Loadable Modules</a></li>
241 <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
242 <li><a href="../www/api/registry.html">The Image Registry</a></li>
243 <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
244 <li><a href="../www/api/memory.html">Memory Allocation</a></li>
245 <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
246 <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
247 <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
248 <li><a href="../www/api/deprecate.html">Deprecated Methods</a></li>
249 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
250</ul>
251
252<p>After you write your MagickCore program, compile it like this:</p>
253
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]254<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]255<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>
256
257<div class="viewport">
258<pre class="code">
259 #include &lt;stdio.h>
260 #include &lt;stdlib.h>
261 #include &lt;string.h>
262 #include &lt;time.h>
263 #include &lt;magick/MagickCore.h>
264
265 int main(int argc,char **argv)
266 {
267 ExceptionInfo
268 *exception;
269
270 Image
271 *image,
272 *images,
273 *resize_image,
274 *thumbnails;
275
276 ImageInfo
277 *image_info;
278
279 if (argc != 3)
280 {
281 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
282 exit(0);
283 }
284 /*
285 Initialize the image info structure and read an image.
286 */
287 MagickCoreGenesis(*argv,MagickTrue);
288 exception=AcquireExceptionInfo();
289 image_info=CloneImageInfo((ImageInfo *) NULL);
290 (void) strcpy(image_info-&gt;filename,argv[1]);
291 images=ReadImage(image_info,exception);
292 if (exception-&gt;severity != UndefinedException)
293 CatchException(exception);
294 if (images == (Image *) NULL)
295 exit(1);
296 /*
297 Convert the image to a thumbnail.
298 */
299 thumbnails=NewImageList();
300 while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
301 {
302 resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
303 if (resize_image == (Image *) NULL)
304 MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
305 (void) AppendImageToList(&amp;thumbnails,resize_image);
306 DestroyImage(image);
307 }
308 /*
309 Write the image thumbnail.
310 */
311 (void) strcpy(thumbnails-&gt;filename,argv[2]);
312 WriteImage(image_info,thumbnails);
313 /*
314 Destroy the image thumbnail and exit.
315 */
316 thumbnails=DestroyImageList(thumbnails);
317 image_info=DestroyImageInfo(image_info);
318 exception=DestroyExceptionInfo(exception);
319 MagickCoreTerminus();
320 return(0);
321 }
322</pre>
323</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]324<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]325
326<div class="viewport">
327<pre class="code">
328#include &lt;stdio.h>
329#include &lt;stdlib.h>
330#include &lt;math.h>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]331#include &lt;magick/MagickCore.h>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]332
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]333static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]334 const ssize_t y,const int id,void *context)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]335{
336#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
337#define SigmoidalContrast(x) \
338 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
339
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]340 RectangleInfo
341 extent;
342
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]343 register IndexPacket
344 *indexes;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]345
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]346 register PixelPacket
347 *pixels;
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]348
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]349 register ssize_t
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]350 x;
351
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]352 extent=GetImageViewExtent(contrast_view);
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]353 pixels=GetImageViewAuthenticPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]354 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]355 {
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]356 pixels[x].red=RoundToQuantum(SigmoidalContrast(pixels[x].red));
357 pixels[x].green=RoundToQuantum(SigmoidalContrast(pixels[x].green));
358 pixels[x].blue=RoundToQuantum(SigmoidalContrast(pixels[x].blue));
359 pixels[x].opacity=RoundToQuantum(SigmoidalContrast(pixels[x].opacity));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]360 }
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]361 indexes=GetImageViewAuthenticIndexes(contrast_view);
362 if (indexes != (IndexPacket *) NULL)
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]363 for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]364 indexes[x]=(IndexPacket) RoundToQuantum(SigmoidalContrast(indexes[x]));
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]365 return(MagickTrue);
366}
367
368int main(int argc,char **argv)
369{
370#define ThrowImageException(image) \
371{ \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]372 \
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]373 CatchException(exception); \
374 if (contrast_image != (Image *) NULL) \
375 contrast_image=DestroyImage(contrast_image); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]376 exit(-1); \
377}
378#define ThrowViewException(view) \
379{ \
380 char \
381 *description; \
382 \
383 ExceptionType \
384 severity; \
385 \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]386 description=GetImageViewException(view,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]387 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
388 description=DestroyString(description); \
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]389 exit(-1); \
390}
391
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]392 ExceptionInfo
393 *exception;
394
395 Image
396 *contrast_image;
397
398 ImageInfo
399 *image_info;
400
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]401 ImageView
402 *contrast_view;
403
404 MagickBooleanType
405 status;
406
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]407 if (argc != 3)
408 {
409 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
410 exit(0);
411 }
412 /*
413 Read an image.
414 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]415 MagickCoreGenesis(*argv,MagickTrue);
416 image_info=AcquireImageInfo();
417 (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
418 exception=AcquireExceptionInfo();
419 contrast_image=ReadImage(image_info,exception);
420 if (contrast_image == (Image *) NULL)
421 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]422 /*
423 Sigmoidal non-linearity contrast control.
424 */
425 contrast_view=NewImageView(contrast_image);
426 if (contrast_view == (ImageView *) NULL)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]427 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]428 status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
429 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]430 ThrowImageException(contrast_image);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]431 contrast_view=DestroyImageView(contrast_view);
432 /*
433 Write the image then destroy it.
434 */
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]435 status=WriteImages(image_info,contrast_image,argv[2],exception);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]436 if (status == MagickFalse)
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]437 ThrowImageException(contrast_image);
438 contrast_image=DestroyImage(contrast_image);
439 exception=DestroyExceptionInfo(exception);
440 image_info=DestroyImageInfo(image_info);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]441 MagickCoreTerminus();
442 return(0);
443}
444</pre>
445</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]446</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]447
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