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cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]219<h1>MagickWand C API</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]220
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]221<div class="doc-section">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222<p>The <a href="../www/api/MagickWand/index.html">MagickWand API</a> is the recommended interface between the C programming language and the ImageMagick image processing libraries. Unlike the <a href="../www/magick-core.html">MagickCore</a> C API, MagickWand uses only a few opaque types. Accessors are available to set or get important wand properties. A description of the MagickWand public methods are found here:</p>
223
224<ul>
225 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
226 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
227 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
228 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]229 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
230 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]231 <li><a href="../www/api/mogrify.html">Command-line Interface</a></li>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]232 <li><a href="../www/api/wand-view.html">Wand View Methods</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
234 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]235</ul>
236
237<p>After you write your MagickWand program, compile it like this:</p>
238
cristyd4d64ed2010-08-22 22:19:33 +0000[diff] [blame]239<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -O2 -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]240<p>Here is a example program that utilizes the MagickWand API to get you started, <a href="../www/source/wand.c">wand.c</a>. It reads an image, creates a thumbnail, and writes the result to disk.</p>
241
242<div class="viewport">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]243#include &lt;stdio.h>
244#include &lt;stdlib.h>
245#include &lt;wand/MagickWand.h>
246
247int main(int argc,char **argv)
248{
249#define ThrowWandException(wand) \
250{ \
251 char \
252 *description; \
253 \
254 ExceptionType \
255 severity; \
256 \
257 description=MagickGetException(wand,&amp;severity); \
cristyacc04882011-05-04 23:03:43 +0000[diff] [blame]258 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]259 description=(char *) MagickRelinquishMemory(description); \
260 exit(-1); \
261}
262
263 MagickBooleanType
264 status;
265
266 MagickWand
267 *magick_wand;
268
269 if (argc != 3)
270 {
271 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
272 exit(0);
273 }
274 /*
275 Read an image.
276 */
277 MagickWandGenesis();
278 magick_wand=NewMagickWand();
279 status=MagickReadImage(magick_wand,argv[1]);
280 if (status == MagickFalse)
281 ThrowWandException(magick_wand);
282 /*
283 Turn the images into a thumbnail sequence.
284 */
285 MagickResetIterator(magick_wand);
286 while (MagickNextImage(magick_wand) != MagickFalse)
287 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
288 /*
289 Write the image then destroy it.
290 */
291 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
292 if (status == MagickFalse)
293 ThrowWandException(magick_wand);
294 magick_wand=DestroyMagickWand(magick_wand);
295 MagickWandTerminus();
296 return(0);
297}
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]298</div>
299
300<p>Here is another program that shows one way to get and set image pixels with the MagickWand API, <a href="../www/source/contrast.c">contrast.c</a>. It reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk.</p>
301
302<div class="viewport">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]303#include &lt;stdio.h>
304#include &lt;stdlib.h>
305#include &lt;math.h>
306#include &lt;wand/MagickWand.h>
307
308int main(int argc,char **argv)
309{
310#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
311#define SigmoidalContrast(x) \
312 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
313#define ThrowWandException(wand) \
314{ \
315 char \
316 *description; \
317 \
318 ExceptionType \
319 severity; \
320 \
321 description=MagickGetException(wand,&amp;severity); \
322 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
323 description=(char *) MagickRelinquishMemory(description); \
324 exit(-1); \
325}
326
327 long
328 y;
329
330 MagickBooleanType
331 status;
332
333 MagickPixelPacket
334 pixel;
335
336 MagickWand
337 *contrast_wand,
338 *image_wand;
339
340 PixelIterator
341 *contrast_iterator,
342 *iterator;
343
344 PixelWand
345 **contrast_pixels,
346 **pixels;
347
348 register long
349 x;
350
351 unsigned long
352 width;
353
354 if (argc != 3)
355 {
356 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
357 exit(0);
358 }
359 /*
360 Read an image.
361 */
362 MagickWandGenesis();
363 image_wand=NewMagickWand();
364 status=MagickReadImage(image_wand,argv[1]);
365 if (status == MagickFalse)
366 ThrowWandException(image_wand);
367 contrast_wand=CloneMagickWand(image_wand);
368 /*
369 Sigmoidal non-linearity contrast control.
370 */
371 iterator=NewPixelIterator(image_wand);
372 contrast_iterator=NewPixelIterator(contrast_wand);
373 if ((iterator == (PixelIterator *) NULL) ||
374 (contrast_iterator == (PixelIterator *) NULL))
375 ThrowWandException(image_wand);
376 for (y=0; y &lt; (long) MagickGetImageHeight(image_wand); y++)
377 {
378 pixels=PixelGetNextIteratorRow(iterator,&amp;width);
379 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&amp;width);
380 if ((pixels == (PixelWand **) NULL) ||
381 (contrast_pixels == (PixelWand **) NULL))
382 break;
383 for (x=0; x &lt; (long) width; x++)
384 {
385 PixelGetMagickColor(pixels[x],&amp;pixel);
386 pixel.red=SigmoidalContrast(pixel.red);
387 pixel.green=SigmoidalContrast(pixel.green);
388 pixel.blue=SigmoidalContrast(pixel.blue);
389 pixel.index=SigmoidalContrast(pixel.index);
390 PixelSetMagickColor(contrast_pixels[x],&amp;pixel);
391 }
392 (void) PixelSyncIterator(contrast_iterator);
393 }
394 if (y &lt; (long) MagickGetImageHeight(image_wand))
395 ThrowWandException(image_wand);
396 contrast_iterator=DestroyPixelIterator(contrast_iterator);
397 iterator=DestroyPixelIterator(iterator);
398 image_wand=DestroyMagickWand(image_wand);
399 /*
400 Write the image then destroy it.
401 */
402 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
403 if (status == MagickFalse)
404 ThrowWandException(image_wand);
405 contrast_wand=DestroyMagickWand(contrast_wand);
406 MagickWandTerminus();
407 return(0);
408}
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]409</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]410<p><a id="wand-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/wand/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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]411
412<div class="viewport">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]413#include &lt;stdio.h>
414#include &lt;stdlib.h>
415#include &lt;math.h>
416#include &lt;wand/MagickWand.h>
417
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]418static MagickBooleanType SigmoidalContrast(WandView *pixel_view,
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]419 const ssize_t y,const int id,void *context)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]420{
421#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
422#define SigmoidalContrast(x) \
423 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
424
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]425 RectangleInfo
426 extent;
427
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]428 MagickPixelPacket
429 pixel;
430
431 PixelWand
432 **pixels;
433
434 register long
435 x;
436
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]437 extent=GetWandViewExtent(contrast_view);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]438 pixels=GetWandViewPixels(contrast_view);
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]439 for (x=0; x &lt; (long) (extent.width-extent.height); x++)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]440 {
441 PixelGetMagickColor(pixels[x],&amp;pixel);
442 pixel.red=SigmoidalContrast(pixel.red);
443 pixel.green=SigmoidalContrast(pixel.green);
444 pixel.blue=SigmoidalContrast(pixel.blue);
445 pixel.index=SigmoidalContrast(pixel.index);
446 PixelSetMagickColor(contrast_pixels[x],&amp;pixel);
447 }
448 return(MagickTrue);
449}
450
451int main(int argc,char **argv)
452{
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]453#define ThrowViewException(view) \
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]454{ \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]455 description=GetWandViewException(view,&amp;severity); \
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]456 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
457 description=(char *) MagickRelinquishMemory(description); \
458 exit(-1); \
459}
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]460#define ThrowWandException(wand) \
461{ \
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]462 description=MagickGetException(wand,&amp;severity); \
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]463 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
464 description=(char *) MagickRelinquishMemory(description); \
465 exit(-1); \
466}
467
468 char
469 *description;
470
471 ExceptionType
472 severity;
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]473
474 MagickBooleanType
475 status;
476
477 MagickPixelPacket
478 pixel;
479
480 MagickWand
481 *contrast_wand;
482
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]483 WandView
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]484 *contrast_view;
485
486 if (argc != 3)
487 {
488 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
489 exit(0);
490 }
491 /*
492 Read an image.
493 */
494 MagickWandGenesis();
495 contrast_wand=NewMagickWand();
496 status=MagickReadImage(contrast_wand,argv[1]);
497 if (status == MagickFalse)
498 ThrowWandException(contrast_wand);
499 /*
500 Sigmoidal non-linearity contrast control.
501 */
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]502 contrast_view=NewWandView(contrast_wand);
503 if (contrast_view == (WandView *) NULL)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]504 ThrowWandException(contrast_wand);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]505 status=UpdateWandViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]506 if (status == MagickFalse)
507 ThrowWandException(contrast_wand);
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]508 contrast_view=DestroyWandView(contrast_view);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]509 /*
510 Write the image then destroy it.
511 */
512 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
513 if (status == MagickFalse)
514 ThrowWandException(contrast_wand);
515 contrast_wand=DestroyMagickWand(contrast_wand);
516 MagickWandTerminus();
517 return(0);
518}
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]519</div>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]520</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]521
522</div>
523
524<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]525 <span id="linkbar-west">&nbsp;</span>
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530 <span id="linkbar-east">&nbsp;</span>
531 </div>
532 <div class="footer">
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