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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]7 <title>ImageMagick: MagickCore, C API for ImageMagick: Image View Methods</title>
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160</div>
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cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]174</div>
175
176<div class="main">
177
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]178<h1>Module image-view
179 Methods</h1>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]180<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]181
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]182<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
183_8c.html" id="CloneImageView">CloneImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]184<div class="doc-section">
185
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]186<p>CloneImageView() makes a copy of the specified image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]187
188<p>The format of the CloneImageView method is:</p>
189
190<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]191 ImageView *CloneImageView(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]192</pre>
193
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]194<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]195
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]196<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]197<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]198
199 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]200<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
201_8c.html" id="DestroyImageView">DestroyImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]202<div class="doc-section">
203
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]204<p>DestroyImageView() deallocates memory associated with a image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]205
206<p>The format of the DestroyImageView method is:</p>
207
208<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]209 ImageView *DestroyImageView(ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]210</pre>
211
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]212<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]213
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]214<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]215<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]216
217 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]218<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
219_8c.html" id="DuplexTransferImageViewIterator">DuplexTransferImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]220<div class="doc-section">
221
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]222<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]223
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]224<p>The callback signature is:</p>
225
226<pre class="text">
227 MagickBooleanType DuplexTransferImageViewMethod(const ImageView *source,
228 const ImageView *duplex,ImageView *destination,const ssize_t y,
229 const int thread_id,void *context)
230</pre>
231
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]232<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]233
234<pre class="text">
235 #pragma omp critical
236</pre>
237
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]238<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]239
240<p>The format of the DuplexTransferImageViewIterator method is:</p>
241
242<pre class="code">
243 MagickBooleanType DuplexTransferImageViewIterator(ImageView *source,
244 ImageView *duplex,ImageView *destination,
245 DuplexTransferImageViewMethod transfer,void *context)
246</pre>
247
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]248<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]249
250<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]251<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]252
253<h5>duplex</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]254<p>the duplex image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]255
256<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]257<p>the destination image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]258
259<h5>transfer</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]260<p>the transfer callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]261
262<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]263<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]264
265 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]266<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
267_8c.html" id="GetImageViewAuthenticIndexes">GetImageViewAuthenticIndexes</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]268<div class="doc-section">
269
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]270<p>GetImageViewAuthenticIndexes() returns the image view authentic indexes.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]271
272<p>The format of the GetImageViewAuthenticPixels method is:</p>
273
274<pre class="code">
275 IndexPacket *GetImageViewAuthenticIndexes(const ImageView *image_view)
276</pre>
277
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]278<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]279
280<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]281<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]282
283 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]284<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
285_8c.html" id="GetImageViewAuthenticPixels">GetImageViewAuthenticPixels</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]286<div class="doc-section">
287
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]288<p>GetImageViewAuthenticPixels() returns the image view authentic pixels.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]289
290<p>The format of the GetImageViewAuthenticPixels method is:</p>
291
292<pre class="code">
293 PixelPacket *GetImageViewAuthenticPixels(const ImageView *image_view)
294</pre>
295
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]296<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]297
298<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]299<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]300
301 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]302<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
303_8c.html" id="GetImageViewException">GetImageViewException</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]304<div class="doc-section">
305
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]306<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]307
308<p>The format of the GetImageViewException method is:</p>
309
310<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]311 char *GetImageViewException(const PixelImage *image_view,
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]312 ExceptionType *severity)
313</pre>
314
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]315<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]316
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]317<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]318<p>the pixel image_view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]319
320<h5>severity</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]321<p>the severity of the error is returned here.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]322
323 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]324<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
325_8c.html" id="GetImageViewExtent">GetImageViewExtent</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]326<div class="doc-section">
327
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]328<p>GetImageViewExtent() returns the image view extent.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]329
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]330<p>The format of the GetImageViewExtent method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]331
332<pre class="code">
cristyc3ebda22010-06-27 17:11:57 +0000[diff] [blame]333 RectangleInfo GetImageViewExtent(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]334</pre>
335
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]336<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]337
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]338<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]339<p>the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]340
341 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]342<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
343_8c.html" id="GetImageViewImage">GetImageViewImage</a></h2>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]344<div class="doc-section">
345
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]346<p>GetImageViewImage() returns the image associated with the image view.</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]347
348<p>The format of the GetImageViewImage method is:</p>
349
350<pre class="code">
351 MagickCore *GetImageViewImage(const ImageView *image_view)
352</pre>
353
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]354<p>A description of each parameter follows:</p>
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]355
356<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]357<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]358
359 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]360<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
361_8c.html" id="GetImageViewIterator">GetImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]362<div class="doc-section">
363
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]364<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]365
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]366<p>The callback signature is:</p>
367
368<pre class="text">
369 MagickBooleanType GetImageViewMethod(const ImageView *source,
370 const ssize_t y,const int thread_id,void *context)
371</pre>
372
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]373<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]374
375<pre class="text">
376 #pragma omp critical
377</pre>
378
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]379<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]380
381<p>The format of the GetImageViewIterator method is:</p>
382
383<pre class="code">
384 MagickBooleanType GetImageViewIterator(ImageView *source,
385 GetImageViewMethod get,void *context)
386</pre>
387
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]388<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]389
390<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]391<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]392
393<h5>get</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]394<p>the get callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]395
396<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]397<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]398
399 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]400<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
401_8c.html" id="GetImageViewVirtualIndexes">GetImageViewVirtualIndexes</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]402<div class="doc-section">
403
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]404<p>GetImageViewVirtualIndexes() returns the image view virtual indexes.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]405
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]406<p>The format of the GetImageViewVirtualIndexes method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]407
408<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]409 const IndexPacket *GetImageViewVirtualIndexes(
410 const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]411</pre>
412
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]413<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]414
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]415<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]416<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]417
418 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]419<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
420_8c.html" id="GetImageViewVirtualPixels">GetImageViewVirtualPixels</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]421<div class="doc-section">
422
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]423<p>GetImageViewVirtualPixels() returns the image view virtual pixels.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]424
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]425<p>The format of the GetImageViewVirtualPixels method is:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]426
427<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]428 const PixelPacket *GetImageViewVirtualPixels(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]429</pre>
430
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]431<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]432
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]433<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]434<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]435
436 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]437<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
438_8c.html" id="IsImageView">IsImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]439<div class="doc-section">
440
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]441<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]442
443<p>The format of the IsImageView method is:</p>
444
445<pre class="code">
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]446 MagickBooleanType IsImageView(const ImageView *image_view)
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]447</pre>
448
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]449<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]450
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]451<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]452<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]453
454 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]455<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
456_8c.html" id="NewImageView">NewImageView</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]457<div class="doc-section">
458
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]459<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]460
461<p>The format of the NewImageView method is:</p>
462
463<pre class="code">
464 ImageView *NewImageView(MagickCore *wand)
465</pre>
466
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]467<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]468
469<h5>wand</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]470<p>the wand.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]471
472 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]473<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
474_8c.html" id="NewImageViewRegion">NewImageViewRegion</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]475<div class="doc-section">
476
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]477<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]478
479<p>The format of the NewImageViewRegion method is:</p>
480
481<pre class="code">
482 ImageView *NewImageViewRegion(MagickCore *wand,const ssize_t x,
483 const ssize_t y,const size_t width,const size_t height)
484</pre>
485
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]486<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]487
488<h5>wand</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]489<p>the magick wand.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]490
491<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]492<p>These values define the perimeter of a extent of pixel_wands view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]493
494 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]495<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
496_8c.html" id="SetImageViewDescription">SetImageViewDescription</a></h2>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]497<div class="doc-section">
498
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]499<p>SetImageViewDescription() associates a description with an image view.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]500
501<p>The format of the SetImageViewDescription method is:</p>
502
503<pre class="code">
504 void SetImageViewDescription(ImageView *image_view,
505 const char *description)
506</pre>
507
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]508<p>A description of each parameter follows:</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]509
510<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]511<p>the image view.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]512
513<h5>description</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]514<p>the image view description.</p>
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]515
516 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]517<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
518_8c.html" id="SetImageViewIterator">SetImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]519<div class="doc-section">
520
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]521<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]522
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]523<p>The callback signature is:</p>
524
525<pre class="text">
526 MagickBooleanType SetImageViewMethod(ImageView *destination,
527 const ssize_t y,const int thread_id,void *context)
528</pre>
529
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]530<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]531
532<pre class="text">
533 #pragma omp critical
534</pre>
535
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]536<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]537
538<p>The format of the SetImageViewIterator method is:</p>
539
540<pre class="code">
541 MagickBooleanType SetImageViewIterator(ImageView *destination,
542 SetImageViewMethod set,void *context)
543</pre>
544
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]545<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]546
547<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]548<p>the image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]549
550<h5>set</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]551<p>the set callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]552
553<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]554<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]555
556 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]557<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
558_8c.html" id="SetImageViewThreads">SetImageViewThreads</a></h2>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]559<div class="doc-section">
560
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]561<p>SetImageViewThreads() sets the number of threads in a thread team.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]562
563<p>The format of the SetImageViewDescription method is:</p>
564
565<pre class="code">
566 void SetImageViewThreads(ImageView *image_view,
567 const size_t number_threads)
568</pre>
569
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]570<p>A description of each parameter follows:</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]571
572<h5>image_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]573<p>the image view.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]574
575<h5>number_threads</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]576<p>the number of threads in a thread team.</p>
cristyce66ab12010-10-21 23:36:32 +0000[diff] [blame]577
578 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]579<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
580_8c.html" id="TransferImageViewIterator">TransferImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]581<div class="doc-section">
582
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]583<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]584
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]585<p>The callback signature is:</p>
586
587<pre class="text">
588 MagickBooleanType TransferImageViewMethod(const ImageView *source,
589 ImageView *destination,const ssize_t y,const int thread_id,
590 void *context)
591</pre>
592
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]593<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]594
595<pre class="text">
596 #pragma omp critical
597</pre>
598
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]599<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]600
601<p>The format of the TransferImageViewIterator method is:</p>
602
603<pre class="code">
604 MagickBooleanType TransferImageViewIterator(ImageView *source,
605 ImageView *destination,TransferImageViewMethod transfer,void *context)
606</pre>
607
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]608<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]609
610<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]611<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]612
613<h5>destination</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]614<p>the destination image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]615
616<h5>transfer</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]617<p>the transfer callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]618
619<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]620<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]621
622 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]623<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/image-view
624_8c.html" id="UpdateImageViewIterator">UpdateImageViewIterator</a></h2>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]625<div class="doc-section">
626
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]627<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]628
cristyd6dfc0d2010-06-27 19:30:49 +0000[diff] [blame]629<p>The callback signature is:</p>
630
631<pre class="text">
632 MagickBooleanType UpdateImageViewMethod(ImageView *source,
633 const ssize_t y,const int thread_id,void *context)
634</pre>
635
cristy73b7d4c2010-06-27 00:31:00 +0000[diff] [blame]636<p>Use this pragma if the view is not single threaded:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]637
638<pre class="text">
639 #pragma omp critical
640</pre>
641
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]642<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]643
644<p>The format of the UpdateImageViewIterator method is:</p>
645
646<pre class="code">
647 MagickBooleanType UpdateImageViewIterator(ImageView *source,
648 UpdateImageViewMethod update,void *context)
649</pre>
650
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]651<p>A description of each parameter follows:</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]652
653<h5>source</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]654<p>the source image view.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]655
656<h5>update</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]657<p>the update callback method.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]658
659<h5>context</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame^]660<p>the user defined context.</p>
cristy10c87152010-06-26 16:12:21 +0000[diff] [blame]661
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