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202 <h1>Module wand-view Methods</h1>
203 <p class="navigation-index">[<a href="#CloneWandView">CloneWandView</a> • <a href="#DestroyWandView">DestroyWandView</a> • <a href="#DuplexTransferWandViewIterator">DuplexTransferWandViewIterator</a> • <a href="#GetWandViewException">GetWandViewException</a> • <a href="#GetWandViewExtent">GetWandViewExtent</a> • <a href="#GetWandViewIterator">GetWandViewIterator</a> • <a href="#GetWandViewPixels">GetWandViewPixels</a> • <a href="#GetWandViewWand">GetWandViewWand</a> • <a href="#IsWandView">IsWandView</a> • <a href="#NewWandView">NewWandView</a> • <a href="#NewWandViewExtent">NewWandViewExtent</a> • <a href="#SetWandViewDescription">SetWandViewDescription</a> • <a href="#SetWandViewIterator">SetWandViewIterator</a> • <a href="#SetWandViewThreads">SetWandViewThreads</a> • <a href="#TransferWandViewIterator">TransferWandViewIterator</a> • <a href="#UpdateWandViewIterator">UpdateWandViewIterator</a>]</p>
205 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="CloneWandView">CloneWandView</a></h2>
206 <div class="doc-section">
208 <p>CloneWandView() makes a copy of the specified wand view.</p>
210 <p>The format of the CloneWandView method is:</p>
213 WandView *CloneWandView(const WandView *wand_view)
216 <p>A description of each parameter follows:</p>
219 <p>the wand view.</p>
222 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="DestroyWandView">DestroyWandView</a></h2>
223 <div class="doc-section">
225 <p>DestroyWandView() deallocates memory associated with a wand view.</p>
227 <p>The format of the DestroyWandView method is:</p>
230 WandView *DestroyWandView(WandView *wand_view)
233 <p>A description of each parameter follows:</p>
236 <p>the wand view.</p>
239 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="DuplexTransferWandViewIterator">DuplexTransferWandViewIterator</a></h2>
240 <div class="doc-section">
242 <p>DuplexTransferWandViewIterator() iterates over three wand 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 wand view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p>
244 <p>The callback signature is:</p>
247 MagickBooleanType DuplexTransferImageViewMethod(const WandView *source,
248 const WandView *duplex,WandView *destination,const ssize_t y,
249 const int thread_id,void *context)
252 <p>Use this pragma if the view is not single threaded:</p>
258 <p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p>
260 <p>The format of the DuplexTransferWandViewIterator method is:</p>
263 MagickBooleanType DuplexTransferWandViewIterator(WandView *source,
264 WandView *duplex,WandView *destination,
265 DuplexTransferWandViewMethod transfer,void *context)
268 <p>A description of each parameter follows:</p>
271 <p>the source wand view.</p>
274 <p>the duplex wand view.</p>
277 <p>the destination wand view.</p>
280 <p>the transfer callback method.</p>
283 <p>the user defined context.</p>
286 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="GetWandViewException">GetWandViewException</a></h2>
287 <div class="doc-section">
289 <p>GetWandViewException() returns the severity, reason, and description of any error that occurs when utilizing a wand view.</p>
291 <p>The format of the GetWandViewException method is:</p>
294 char *GetWandViewException(const PixelWand *wand_view,
295 ExceptionType *severity)
298 <p>A description of each parameter follows:</p>
301 <p>the pixel wand_view.</p>
304 <p>the severity of the error is returned here.</p>
307 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="GetWandViewExtent">GetWandViewExtent</a></h2>
308 <div class="doc-section">
310 <p>GetWandViewExtent() returns the wand view extent.</p>
312 <p>The format of the GetWandViewExtent method is:</p>
315 RectangleInfo GetWandViewExtent(const WandView *wand_view)
318 <p>A description of each parameter follows:</p>
321 <p>the wand view.</p>
324 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="GetWandViewIterator">GetWandViewIterator</a></h2>
325 <div class="doc-section">
327 <p>GetWandViewIterator() iterates over the wand 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>
329 <p>The callback signature is:</p>
332 MagickBooleanType GetImageViewMethod(const WandView *source,
333 const ssize_t y,const int thread_id,void *context)
336 <p>Use this pragma if the view is not single threaded:</p>
342 <p>to define a section of code in your callback get method that must be executed by a single thread at a time.</p>
344 <p>The format of the GetWandViewIterator method is:</p>
347 MagickBooleanType GetWandViewIterator(WandView *source,
348 GetWandViewMethod get,void *context)
351 <p>A description of each parameter follows:</p>
354 <p>the source wand view.</p>
357 <p>the get callback method.</p>
360 <p>the user defined context.</p>
363 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="GetWandViewPixels">GetWandViewPixels</a></h2>
364 <div class="doc-section">
366 <p>GetWandViewPixels() returns the wand view pixel_wands.</p>
368 <p>The format of the GetWandViewPixels method is:</p>
371 PixelWand *GetWandViewPixels(const WandView *wand_view)
374 <p>A description of each parameter follows:</p>
377 <p>the wand view.</p>
380 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="GetWandViewWand">GetWandViewWand</a></h2>
381 <div class="doc-section">
383 <p>GetWandViewWand() returns the magick wand associated with the wand view.</p>
385 <p>The format of the GetWandViewWand method is:</p>
388 MagickWand *GetWandViewWand(const WandView *wand_view)
391 <p>A description of each parameter follows:</p>
394 <p>the wand view.</p>
397 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="IsWandView">IsWandView</a></h2>
398 <div class="doc-section">
400 <p>IsWandView() returns MagickTrue if the the parameter is verified as a wand view object.</p>
402 <p>The format of the IsWandView method is:</p>
405 MagickBooleanType IsWandView(const WandView *wand_view)
408 <p>A description of each parameter follows:</p>
411 <p>the wand view.</p>
414 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="NewWandView">NewWandView</a></h2>
415 <div class="doc-section">
417 <p>NewWandView() returns a wand view required for all other methods in the Wand View API.</p>
419 <p>The format of the NewWandView method is:</p>
422 WandView *NewWandView(MagickWand *wand)
425 <p>A description of each parameter follows:</p>
431 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="NewWandViewExtent">NewWandViewExtent</a></h2>
432 <div class="doc-section">
434 <p>NewWandViewExtent() returns a wand view required for all other methods in the Wand View API.</p>
436 <p>The format of the NewWandViewExtent method is:</p>
439 WandView *NewWandViewExtent(MagickWand *wand,const ssize_t x,
440 const ssize_t y,const size_t width,const size_t height)
443 <p>A description of each parameter follows:</p>
446 <p>the magick wand.</p>
448 <h5>x,y,columns,rows</h5>
449 <p>These values define the perimeter of a extent of pixel_wands view.</p>
452 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="SetWandViewDescription">SetWandViewDescription</a></h2>
453 <div class="doc-section">
455 <p>SetWandViewDescription() associates a description with an image view.</p>
457 <p>The format of the SetWandViewDescription method is:</p>
460 void SetWandViewDescription(WandView *image_view,const char *description)
463 <p>A description of each parameter follows:</p>
466 <p>the wand view.</p>
469 <p>the wand view description.</p>
472 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="SetWandViewIterator">SetWandViewIterator</a></h2>
473 <div class="doc-section">
475 <p>SetWandViewIterator() iterates over the wand 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>
477 <p>The callback signature is:</p>
480 MagickBooleanType SetImageViewMethod(ImageView *destination,
481 const ssize_t y,const int thread_id,void *context)
484 <p>Use this pragma if the view is not single threaded:</p>
490 <p>to define a section of code in your callback set method that must be executed by a single thread at a time.</p>
492 <p>The format of the SetWandViewIterator method is:</p>
495 MagickBooleanType SetWandViewIterator(WandView *destination,
496 SetWandViewMethod set,void *context)
499 <p>A description of each parameter follows:</p>
502 <p>the wand view.</p>
505 <p>the set callback method.</p>
508 <p>the user defined context.</p>
511 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="SetWandViewThreads">SetWandViewThreads</a></h2>
512 <div class="doc-section">
514 <p>SetWandViewThreads() sets the number of threads in a thread team.</p>
516 <p>The format of the SetWandViewDescription method is:</p>
519 void SetWandViewThreads(WandView *image_view,
520 const size_t number_threads)
523 <p>A description of each parameter follows:</p>
526 <p>the image view.</p>
528 <h5>number_threads</h5>
529 <p>the number of threads in a thread team.</p>
532 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="TransferWandViewIterator">TransferWandViewIterator</a></h2>
533 <div class="doc-section">
535 <p>TransferWandViewIterator() iterates over two wand 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 wand view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p>
537 <p>The callback signature is:</p>
540 MagickBooleanType TransferImageViewMethod(const WandView *source,
541 WandView *destination,const ssize_t y,const int thread_id,
545 <p>Use this pragma if the view is not single threaded:</p>
551 <p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p>
553 <p>The format of the TransferWandViewIterator method is:</p>
556 MagickBooleanType TransferWandViewIterator(WandView *source,
557 WandView *destination,TransferWandViewMethod transfer,void *context)
560 <p>A description of each parameter follows:</p>
563 <p>the source wand view.</p>
566 <p>the destination wand view.</p>
569 <p>the transfer callback method.</p>
572 <p>the user defined context.</p>
575 <h2><a href="http://www.imagemagick.org/api/MagickWand/wand-view_8c.html" id="UpdateWandViewIterator">UpdateWandViewIterator</a></h2>
576 <div class="doc-section">
578 <p>UpdateWandViewIterator() iterates over the wand 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>
580 <p>The callback signature is:</p>
583 MagickBooleanType UpdateImageViewMethod(WandView *source,const ssize_t y,
584 const int thread_id,void *context)
587 <p>Use this pragma if the view is not single threaded:</p>
593 <p>to define a section of code in your callback update method that must be executed by a single thread at a time.</p>
595 <p>The format of the UpdateWandViewIterator method is:</p>
598 MagickBooleanType UpdateWandViewIterator(WandView *source,
599 UpdateWandViewMethod update,void *context)
602 <p>A description of each parameter follows:</p>
605 <p>the source wand view.</p>
608 <p>the update callback method.</p>
611 <p>the user defined context.</p>
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