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151
152</div>
153
154<div class="main">
155
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]156<p class="navigation-index"></p>
157
158<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>
159
160<ul>
161 <li><a href="../www/api/magick-wand.html">Magick Wand Methods</a></li>
162 <li><a href="../www/api/magick-property.html">Set or Get Magick Wand Properties</a></li>
163 <li><a href="../www/api/magick-image.html">Magick Wand Image Methods</a></li>
164 <li><a href="../www/api/pixel-iterator.html">Pixel Iterator Methods</a></li>
165 <li><a href="../www/api/pixel-view.html">Pixel View Methods</a></li>
166 <li><a href="../www/api/pixel-wand.html">Pixel Wand Methods</a></li>
167 <li><a href="../www/api/drawing-wand.html">Image Vector Drawing</a></li>
168 <li><a href="../www/api/magick-deprecate.html">Deprecated Methods</a></li>
169 <li><a href="../www/exception.html">Error and Warning Codes</a></li>
170</li>
171</ul>
172
173<p>After you write your MagickWand program, compile it like this:</p>
174
cristy4949d522010-03-12 18:41:34 +0000[diff] [blame]175<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>cc `MagickWand-config --cflags --cppflags` -o wand wand.c \ <br/> `MagickWand-config --ldflags --libs`</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]176<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>
177
178<div class="viewport">
179<pre class="code">
180#include &lt;stdio.h>
181#include &lt;stdlib.h>
182#include &lt;wand/MagickWand.h>
183
184int main(int argc,char **argv)
185{
186#define ThrowWandException(wand) \
187{ \
188 char \
189 *description; \
190 \
191 ExceptionType \
192 severity; \
193 \
194 description=MagickGetException(wand,&amp;severity); \
cristyc3186d52010-06-04 13:55:23 +0000[diff] [blame]195 (void) fprintf(stderr,"%s %s %u %s\n",GetMagickModule(),description); \
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196 description=(char *) MagickRelinquishMemory(description); \
197 exit(-1); \
198}
199
200 MagickBooleanType
201 status;
202
203 MagickWand
204 *magick_wand;
205
206 if (argc != 3)
207 {
208 (void) fprintf(stdout,"Usage: %s image thumbnail\n",argv[0]);
209 exit(0);
210 }
211 /*
212 Read an image.
213 */
214 MagickWandGenesis();
215 magick_wand=NewMagickWand();
216 status=MagickReadImage(magick_wand,argv[1]);
217 if (status == MagickFalse)
218 ThrowWandException(magick_wand);
219 /*
220 Turn the images into a thumbnail sequence.
221 */
222 MagickResetIterator(magick_wand);
223 while (MagickNextImage(magick_wand) != MagickFalse)
224 MagickResizeImage(magick_wand,106,80,LanczosFilter,1.0);
225 /*
226 Write the image then destroy it.
227 */
228 status=MagickWriteImages(magick_wand,argv[2],MagickTrue);
229 if (status == MagickFalse)
230 ThrowWandException(magick_wand);
231 magick_wand=DestroyMagickWand(magick_wand);
232 MagickWandTerminus();
233 return(0);
234}
235</pre>
236</div>
237
238<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>
239
240<div class="viewport">
241<pre class="code">
242#include &lt;stdio.h>
243#include &lt;stdlib.h>
244#include &lt;math.h>
245#include &lt;wand/MagickWand.h>
246
247int main(int argc,char **argv)
248{
249#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
250#define SigmoidalContrast(x) \
251 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
252#define ThrowWandException(wand) \
253{ \
254 char \
255 *description; \
256 \
257 ExceptionType \
258 severity; \
259 \
260 description=MagickGetException(wand,&amp;severity); \
261 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
262 description=(char *) MagickRelinquishMemory(description); \
263 exit(-1); \
264}
265
266 long
267 y;
268
269 MagickBooleanType
270 status;
271
272 MagickPixelPacket
273 pixel;
274
275 MagickWand
276 *contrast_wand,
277 *image_wand;
278
279 PixelIterator
280 *contrast_iterator,
281 *iterator;
282
283 PixelWand
284 **contrast_pixels,
285 **pixels;
286
287 register long
288 x;
289
290 unsigned long
291 width;
292
293 if (argc != 3)
294 {
295 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
296 exit(0);
297 }
298 /*
299 Read an image.
300 */
301 MagickWandGenesis();
302 image_wand=NewMagickWand();
303 status=MagickReadImage(image_wand,argv[1]);
304 if (status == MagickFalse)
305 ThrowWandException(image_wand);
306 contrast_wand=CloneMagickWand(image_wand);
307 /*
308 Sigmoidal non-linearity contrast control.
309 */
310 iterator=NewPixelIterator(image_wand);
311 contrast_iterator=NewPixelIterator(contrast_wand);
312 if ((iterator == (PixelIterator *) NULL) ||
313 (contrast_iterator == (PixelIterator *) NULL))
314 ThrowWandException(image_wand);
315 for (y=0; y &lt; (long) MagickGetImageHeight(image_wand); y++)
316 {
317 pixels=PixelGetNextIteratorRow(iterator,&amp;width);
318 contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&amp;width);
319 if ((pixels == (PixelWand **) NULL) ||
320 (contrast_pixels == (PixelWand **) NULL))
321 break;
322 for (x=0; x &lt; (long) width; x++)
323 {
324 PixelGetMagickColor(pixels[x],&amp;pixel);
325 pixel.red=SigmoidalContrast(pixel.red);
326 pixel.green=SigmoidalContrast(pixel.green);
327 pixel.blue=SigmoidalContrast(pixel.blue);
328 pixel.index=SigmoidalContrast(pixel.index);
329 PixelSetMagickColor(contrast_pixels[x],&amp;pixel);
330 }
331 (void) PixelSyncIterator(contrast_iterator);
332 }
333 if (y &lt; (long) MagickGetImageHeight(image_wand))
334 ThrowWandException(image_wand);
335 contrast_iterator=DestroyPixelIterator(contrast_iterator);
336 iterator=DestroyPixelIterator(iterator);
337 image_wand=DestroyMagickWand(image_wand);
338 /*
339 Write the image then destroy it.
340 */
341 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
342 if (status == MagickFalse)
343 ThrowWandException(image_wand);
344 contrast_wand=DestroyMagickWand(contrast_wand);
345 MagickWandTerminus();
346 return(0);
347}
348</pre>
349</div>
350<p>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 pixel views. The <a href="../www/source/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>
351
352<div class="viewport">
353<pre class="code">
354#include &lt;stdio.h>
355#include &lt;stdlib.h>
356#include &lt;math.h>
357#include &lt;wand/MagickWand.h>
358
359static MagickBooleanType SigmoidalContrast(PixelView *pixel_view,
360 void *context)
361{
362#define QuantumScale ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
363#define SigmoidalContrast(x) \
364 (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
365
366 MagickPixelPacket
367 pixel;
368
369 PixelWand
370 **pixels;
371
372 register long
373 x;
374
375 pixels=GetPixelViewPixels(contrast_view);
376 for (x=0; x &lt; (long) GetPixelViewWidth(contrast_view); x++)
377 {
378 PixelGetMagickColor(pixels[x],&amp;pixel);
379 pixel.red=SigmoidalContrast(pixel.red);
380 pixel.green=SigmoidalContrast(pixel.green);
381 pixel.blue=SigmoidalContrast(pixel.blue);
382 pixel.index=SigmoidalContrast(pixel.index);
383 PixelSetMagickColor(contrast_pixels[x],&amp;pixel);
384 }
385 return(MagickTrue);
386}
387
388int main(int argc,char **argv)
389{
390#define ThrowWandException(wand) \
391{ \
392 char \
393 *description; \
394 \
395 ExceptionType \
396 severity; \
397 \
398 description=MagickGetException(wand,&amp;severity); \
399 (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
400 description=(char *) MagickRelinquishMemory(description); \
401 exit(-1); \
402}
403
404 MagickBooleanType
405 status;
406
407 MagickPixelPacket
408 pixel;
409
410 MagickWand
411 *contrast_wand;
412
413 PixelView
414 *contrast_view;
415
416 if (argc != 3)
417 {
418 (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
419 exit(0);
420 }
421 /*
422 Read an image.
423 */
424 MagickWandGenesis();
425 contrast_wand=NewMagickWand();
426 status=MagickReadImage(contrast_wand,argv[1]);
427 if (status == MagickFalse)
428 ThrowWandException(contrast_wand);
429 /*
430 Sigmoidal non-linearity contrast control.
431 */
432 contrast_view=NewPixelView(contrast_wand);
433 if (contrast_view == (PixelView *) NULL)
434 ThrowWandException(contrast_wand);
435 status=UpdatePixelViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
436 if (status == MagickFalse)
437 ThrowWandException(contrast_wand);
438 contrast_view=DestroyPixelView(contrast_view);
439 /*
440 Write the image then destroy it.
441 */
442 status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
443 if (status == MagickFalse)
444 ThrowWandException(contrast_wand);
445 contrast_wand=DestroyMagickWand(contrast_wand);
446 MagickWandTerminus();
447 return(0);
448}
449</pre>
450</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]451
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