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gerrit-public.fairphone.software / platform / external / ImageMagick / e6529ff52c05a2d3352d83a429cb69aa15f5b585 / . / www / api / image-view.html
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cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]177</div>
178
179<div class="main">
180
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module image-view
182 Methods</h1>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]183<p class="navigation-index">[<a href="#CloneImageView">CloneImageView</a> &bull; <a href="#DestroyImageView">DestroyImageView</a> &bull; <a href="#DuplexTransferImageViewIterator">DuplexTransferImageViewIterator</a> &bull; <a href="#GetImageViewAuthenticIndexes">GetImageViewAuthenticIndexes</a> &bull; <a href="#GetImageViewAuthenticPixels">GetImageViewAuthenticPixels</a> &bull; <a href="#GetImageViewException">GetImageViewException</a> &bull; <a href="#GetImageViewExtent">GetImageViewExtent</a> &bull; <a href="#GetImageViewImage">GetImageViewImage</a> &bull; <a href="#GetImageViewIterator">GetImageViewIterator</a> &bull; <a href="#GetImageViewVirtualIndexes">GetImageViewVirtualIndexes</a> &bull; <a href="#GetImageViewVirtualPixels">GetImageViewVirtualPixels</a> &bull; <a href="#IsImageView">IsImageView</a> &bull; <a href="#NewImageView">NewImageView</a> &bull; <a href="#NewImageViewRegion">NewImageViewRegion</a> &bull; <a href="#SetImageViewDescription">SetImageViewDescription</a> &bull; <a href="#SetImageViewIterator">SetImageViewIterator</a> &bull; <a href="#SetImageViewThreads">SetImageViewThreads</a> &bull; <a href="#TransferImageViewIterator">TransferImageViewIterator</a> &bull; <a href="#UpdateImageViewIterator">UpdateImageViewIterator</a>]</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
186_8c.html" id="CloneImageView">CloneImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]187<div class="doc-section">
188
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]189<p>CloneImageView() makes a copy of the specified image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]190
191<p>The format of the CloneImageView method is:</p>
192
193<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]194 ImageView *CloneImageView(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]195</pre>
196
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]197<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]198
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]199<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]200<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]201
202 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]203<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
204_8c.html" id="DestroyImageView">DestroyImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]205<div class="doc-section">
206
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]207<p>DestroyImageView() deallocates memory associated with a image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]208
209<p>The format of the DestroyImageView method is:</p>
210
211<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]212 ImageView *DestroyImageView(ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]213</pre>
214
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]215<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]216
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]217<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]218<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]219
220 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]221<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
222_8c.html" id="DuplexTransferImageViewIterator">DuplexTransferImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]223<div class="doc-section">
224
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]225<p>DuplexTransferImageViewIterator() iterates over three image views in parallel and calls your transfer method for each scanline of the view. The source and duplex pixel extent is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. However, the destination image view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]226
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]227<p>The callback signature is:</p>
228
229<pre class="text">
230 MagickBooleanType DuplexTransferImageViewMethod(const ImageView *source,
231 const ImageView *duplex,ImageView *destination,const ssize_t y,
232 const int thread_id,void *context)
233</pre>
234
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]235<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]236
237<pre class="text">
238 #pragma omp critical
239</pre>
240
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]241<p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]242
243<p>The format of the DuplexTransferImageViewIterator method is:</p>
244
245<pre class="code">
246 MagickBooleanType DuplexTransferImageViewIterator(ImageView *source,
247 ImageView *duplex,ImageView *destination,
248 DuplexTransferImageViewMethod transfer,void *context)
249</pre>
250
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]251<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]252
253<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]254<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]255
256<h5>duplex</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]257<p>the duplex image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]258
259<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]260<p>the destination image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]261
262<h5>transfer</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]263<p>the transfer callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]264
265<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]266<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]267
268 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
270_8c.html" id="GetImageViewAuthenticIndexes">GetImageViewAuthenticIndexes</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]271<div class="doc-section">
272
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]273<p>GetImageViewAuthenticIndexes() returns the image view authentic indexes.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]274
275<p>The format of the GetImageViewAuthenticPixels method is:</p>
276
277<pre class="code">
278 IndexPacket *GetImageViewAuthenticIndexes(const ImageView *image_view)
279</pre>
280
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]281<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]282
283<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]284<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]285
286 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]287<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
288_8c.html" id="GetImageViewAuthenticPixels">GetImageViewAuthenticPixels</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]289<div class="doc-section">
290
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]291<p>GetImageViewAuthenticPixels() returns the image view authentic pixels.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]292
293<p>The format of the GetImageViewAuthenticPixels method is:</p>
294
295<pre class="code">
296 PixelPacket *GetImageViewAuthenticPixels(const ImageView *image_view)
297</pre>
298
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]299<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]300
301<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]302<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]303
304 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]305<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
306_8c.html" id="GetImageViewException">GetImageViewException</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]307<div class="doc-section">
308
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]309<p>GetImageViewException() returns the severity, reason, and description of any error that occurs when utilizing a image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]310
311<p>The format of the GetImageViewException method is:</p>
312
313<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]314 char *GetImageViewException(const PixelImage *image_view,
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]315 ExceptionType *severity)
316</pre>
317
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]318<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]319
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]320<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]321<p>the pixel image_view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]322
323<h5>severity</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]324<p>the severity of the error is returned here.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]325
326 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]327<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
328_8c.html" id="GetImageViewExtent">GetImageViewExtent</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]329<div class="doc-section">
330
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]331<p>GetImageViewExtent() returns the image view extent.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]332
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]333<p>The format of the GetImageViewExtent method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]334
335<pre class="code">
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]336 RectangleInfo GetImageViewExtent(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]337</pre>
338
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]339<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]340
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]341<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]342<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]343
344 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]345<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
346_8c.html" id="GetImageViewImage">GetImageViewImage</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]347<div class="doc-section">
348
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>GetImageViewImage() returns the image associated with the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]350
351<p>The format of the GetImageViewImage method is:</p>
352
353<pre class="code">
354 MagickCore *GetImageViewImage(const ImageView *image_view)
355</pre>
356
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]357<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]358
359<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]360<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]361
362 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]363<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
364_8c.html" id="GetImageViewIterator">GetImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]365<div class="doc-section">
366
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]367<p>GetImageViewIterator() iterates over the image view in parallel and calls your get method for each scanline of the view. The pixel extent is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. Any updates to the pixels in your callback are ignored.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]368
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]369<p>The callback signature is:</p>
370
371<pre class="text">
372 MagickBooleanType GetImageViewMethod(const ImageView *source,
373 const ssize_t y,const int thread_id,void *context)
374</pre>
375
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]376<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]377
378<pre class="text">
379 #pragma omp critical
380</pre>
381
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]382<p>to define a section of code in your callback get method that must be executed by a single thread at a time.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]383
384<p>The format of the GetImageViewIterator method is:</p>
385
386<pre class="code">
387 MagickBooleanType GetImageViewIterator(ImageView *source,
388 GetImageViewMethod get,void *context)
389</pre>
390
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]391<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]392
393<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]394<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]395
396<h5>get</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]397<p>the get callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]398
399<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]400<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]401
402 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]403<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
404_8c.html" id="GetImageViewVirtualIndexes">GetImageViewVirtualIndexes</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]405<div class="doc-section">
406
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]407<p>GetImageViewVirtualIndexes() returns the image view virtual indexes.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]408
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]409<p>The format of the GetImageViewVirtualIndexes method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]410
411<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]412 const IndexPacket *GetImageViewVirtualIndexes(
413 const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]414</pre>
415
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]416<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]417
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]418<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]419<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]420
421 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]422<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
423_8c.html" id="GetImageViewVirtualPixels">GetImageViewVirtualPixels</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]424<div class="doc-section">
425
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]426<p>GetImageViewVirtualPixels() returns the image view virtual pixels.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]427
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]428<p>The format of the GetImageViewVirtualPixels method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]429
430<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]431 const PixelPacket *GetImageViewVirtualPixels(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]432</pre>
433
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]434<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]435
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]436<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]437<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]438
439 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]440<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
441_8c.html" id="IsImageView">IsImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]442<div class="doc-section">
443
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]444<p>IsImageView() returns MagickTrue if the the parameter is verified as a image view object.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]445
446<p>The format of the IsImageView method is:</p>
447
448<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]449 MagickBooleanType IsImageView(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]450</pre>
451
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]452<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]453
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]454<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]455<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]456
457 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]458<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
459_8c.html" id="NewImageView">NewImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]460<div class="doc-section">
461
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]462<p>NewImageView() returns a image view required for all other methods in the Image View API.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]463
464<p>The format of the NewImageView method is:</p>
465
466<pre class="code">
467 ImageView *NewImageView(MagickCore *wand)
468</pre>
469
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]470<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]471
472<h5>wand</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]473<p>the wand.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]474
475 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]476<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
477_8c.html" id="NewImageViewRegion">NewImageViewRegion</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]478<div class="doc-section">
479
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]480<p>NewImageViewRegion() returns a image view required for all other methods in the Image View API.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]481
482<p>The format of the NewImageViewRegion method is:</p>
483
484<pre class="code">
485 ImageView *NewImageViewRegion(MagickCore *wand,const ssize_t x,
486 const ssize_t y,const size_t width,const size_t height)
487</pre>
488
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]489<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]490
491<h5>wand</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]492<p>the magick wand.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]493
494<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]495<p>These values define the perimeter of a extent of pixel_wands view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]496
497 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]498<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
499_8c.html" id="SetImageViewDescription">SetImageViewDescription</a></h2>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]500<div class="doc-section">
501
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]502<p>SetImageViewDescription() associates a description with an image view.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]503
504<p>The format of the SetImageViewDescription method is:</p>
505
506<pre class="code">
507 void SetImageViewDescription(ImageView *image_view,
508 const char *description)
509</pre>
510
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]511<p>A description of each parameter follows:</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]512
513<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]514<p>the image view.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]515
516<h5>description</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]517<p>the image view description.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]518
519 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]520<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
521_8c.html" id="SetImageViewIterator">SetImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]522<div class="doc-section">
523
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]524<p>SetImageViewIterator() iterates over the image view in parallel and calls your set method for each scanline of the view. The pixel extent is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension. The pixels are initiallly undefined and any settings you make in the callback method are automagically synced back to your image.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]525
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]526<p>The callback signature is:</p>
527
528<pre class="text">
529 MagickBooleanType SetImageViewMethod(ImageView *destination,
530 const ssize_t y,const int thread_id,void *context)
531</pre>
532
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]533<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]534
535<pre class="text">
536 #pragma omp critical
537</pre>
538
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]539<p>to define a section of code in your callback set method that must be executed by a single thread at a time.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]540
541<p>The format of the SetImageViewIterator method is:</p>
542
543<pre class="code">
544 MagickBooleanType SetImageViewIterator(ImageView *destination,
545 SetImageViewMethod set,void *context)
546</pre>
547
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]548<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]549
550<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]551<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]552
553<h5>set</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]554<p>the set callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]555
556<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]557<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]558
559 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]560<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
561_8c.html" id="SetImageViewThreads">SetImageViewThreads</a></h2>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]562<div class="doc-section">
563
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]564<p>SetImageViewThreads() sets the number of threads in a thread team.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]565
566<p>The format of the SetImageViewDescription method is:</p>
567
568<pre class="code">
569 void SetImageViewThreads(ImageView *image_view,
570 const size_t number_threads)
571</pre>
572
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]573<p>A description of each parameter follows:</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]574
575<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]576<p>the image view.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]577
578<h5>number_threads</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]579<p>the number of threads in a thread team.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]580
581 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]582<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
583_8c.html" id="TransferImageViewIterator">TransferImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]584<div class="doc-section">
585
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]586<p>TransferImageViewIterator() iterates over two image views in parallel and calls your transfer method for each scanline of the view. The source pixel extent is not confined to the image canvas-- that is you can include negative offsets or widths or heights that exceed the image dimension. However, the destination image view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]587
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]588<p>The callback signature is:</p>
589
590<pre class="text">
591 MagickBooleanType TransferImageViewMethod(const ImageView *source,
592 ImageView *destination,const ssize_t y,const int thread_id,
593 void *context)
594</pre>
595
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]596<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]597
598<pre class="text">
599 #pragma omp critical
600</pre>
601
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]602<p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]603
604<p>The format of the TransferImageViewIterator method is:</p>
605
606<pre class="code">
607 MagickBooleanType TransferImageViewIterator(ImageView *source,
608 ImageView *destination,TransferImageViewMethod transfer,void *context)
609</pre>
610
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]611<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]612
613<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]614<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]615
616<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]617<p>the destination image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]618
619<h5>transfer</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]620<p>the transfer callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]621
622<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]623<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]624
625 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]626<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
627_8c.html" id="UpdateImageViewIterator">UpdateImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]628<div class="doc-section">
629
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]630<p>UpdateImageViewIterator() iterates over the image view in parallel and calls your update method for each scanline of the view. The pixel extent is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted. Updates to pixels in your callback are automagically synced back to the image.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]631
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]632<p>The callback signature is:</p>
633
634<pre class="text">
635 MagickBooleanType UpdateImageViewMethod(ImageView *source,
636 const ssize_t y,const int thread_id,void *context)
637</pre>
638
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]639<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]640
641<pre class="text">
642 #pragma omp critical
643</pre>
644
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]645<p>to define a section of code in your callback update method that must be executed by a single thread at a time.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]646
647<p>The format of the UpdateImageViewIterator method is:</p>
648
649<pre class="code">
650 MagickBooleanType UpdateImageViewIterator(ImageView *source,
651 UpdateImageViewMethod update,void *context)
652</pre>
653
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]654<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]655
656<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]657<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]658
659<h5>update</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]660<p>the update callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]661
662<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]663<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]664
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