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12 <title>ImageMagick: MagickWand, C API for ImageMagick: Pixel View Methods</title>
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155 <p class="navigation-index">[<a href="#ClonePixelView">ClonePixelView</a> • <a href="#DestroyPixelView">DestroyPixelView</a> • <a href="#DuplexTransferPixelViewIterator">DuplexTransferPixelViewIterator</a> • <a href="#GetPixelViewException">GetPixelViewException</a> • <a href="#GetPixelViewHeight">GetPixelViewHeight</a> • <a href="#GetPixelViewIterator">GetPixelViewIterator</a> • <a href="#GetPixelViewPixels">GetPixelViewPixels</a> • <a href="#GetPixelViewWand">GetPixelViewWand</a> • <a href="#GetPixelViewWidth">GetPixelViewWidth</a> • <a href="#GetPixelViewX">GetPixelViewX</a> • <a href="#GetPixelViewY">GetPixelViewY</a> • <a href="#IsPixelView">IsPixelView</a> • <a href="#NewPixelView">NewPixelView</a> • <a href="#NewPixelViewRegion">NewPixelViewRegion</a> • <a href="#SetPixelViewIterator">SetPixelViewIterator</a> • <a href="#TransferPixelViewIterator">TransferPixelViewIterator</a> • <a href="#UpdatePixelViewIterator">UpdatePixelViewIterator</a>]</p>
157 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
158 _8c.html" target="source" name="ClonePixelView">ClonePixelView</a></h2>
159 <div class="doc-section">
161 <p>ClonePixelView() makes a copy of the specified pixel view.</p></ol>
163 <p>The format of the ClonePixelView method is:</p>
166 PixelView *ClonePixelView(const PixelView *pixel_view)
169 <p>A description of each parameter follows:</p></ol>
172 <ol><p>the pixel view.</p></ol>
175 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
176 _8c.html" target="source" name="DestroyPixelView">DestroyPixelView</a></h2>
177 <div class="doc-section">
179 <p>DestroyPixelView() deallocates memory associated with a pixel view.</p></ol>
181 <p>The format of the DestroyPixelView method is:</p>
184 PixelView *DestroyPixelView(PixelView *pixel_view,
185 const size_t number_wands,const size_t number_threads)
188 <p>A description of each parameter follows:</p></ol>
191 <ol><p>the pixel view.</p></ol>
194 <ol><p>the number of pixel wands.</p></ol>
196 <h5>number_threads</h5>
197 <ol><p>number of threads.</p></ol>
200 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
201 _8c.html" target="source" name="DuplexTransferPixelViewIterator">DuplexTransferPixelViewIterator</a></h2>
202 <div class="doc-section">
204 <p>DuplexTransferPixelViewIterator() iterates over three pixel views in parallel and calls your transfer method for each scanline of the view. The source and duplex pixel region 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 pixel view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p></ol>
206 <p>Use this pragma:</p>
212 <p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p></ol>
214 <p>The format of the DuplexTransferPixelViewIterator method is:</p>
217 MagickBooleanType DuplexTransferPixelViewIterator(PixelView *source,
218 PixelView *duplex,PixelView *destination,
219 DuplexTransferPixelViewMethod transfer,void *context)
222 <p>A description of each parameter follows:</p></ol>
225 <ol><p>the source pixel view.</p></ol>
228 <ol><p>the duplex pixel view.</p></ol>
231 <ol><p>the destination pixel view.</p></ol>
234 <ol><p>the transfer callback method.</p></ol>
237 <ol><p>the user defined context.</p></ol>
240 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
241 _8c.html" target="source" name="GetPixelViewException">GetPixelViewException</a></h2>
242 <div class="doc-section">
244 <p>GetPixelViewException() returns the severity, reason, and description of any error that occurs when utilizing a pixel view.</p></ol>
246 <p>The format of the GetPixelViewException method is:</p>
249 char *GetPixelViewException(const PixelWand *pixel_view,
250 ExceptionType *severity)
253 <p>A description of each parameter follows:</p></ol>
256 <ol><p>the pixel pixel_view.</p></ol>
259 <ol><p>the severity of the error is returned here.</p></ol>
262 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
263 _8c.html" target="source" name="GetPixelViewHeight">GetPixelViewHeight</a></h2>
264 <div class="doc-section">
266 <p>GetPixelViewHeight() returns the pixel view height.</p></ol>
268 <p>The format of the GetPixelViewHeight method is:</p>
271 size_t GetPixelViewHeight(const PixelView *pixel_view)
274 <p>A description of each parameter follows:</p></ol>
277 <ol><p>the pixel view.</p></ol>
280 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
281 _8c.html" target="source" name="GetPixelViewIterator">GetPixelViewIterator</a></h2>
282 <div class="doc-section">
284 <p>GetPixelViewIterator() iterates over the pixel view in parallel and calls your get method for each scanline of the view. The pixel region 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></ol>
286 <p>Use this pragma:</p>
292 <p>to define a section of code in your callback get method that must be executed by a single thread at a time.</p></ol>
294 <p>The format of the GetPixelViewIterator method is:</p>
297 MagickBooleanType GetPixelViewIterator(PixelView *source,
298 GetPixelViewMethod get,void *context)
301 <p>A description of each parameter follows:</p></ol>
304 <ol><p>the source pixel view.</p></ol>
307 <ol><p>the get callback method.</p></ol>
310 <ol><p>the user defined context.</p></ol>
313 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
314 _8c.html" target="source" name="GetPixelViewPixels">GetPixelViewPixels</a></h2>
315 <div class="doc-section">
317 <p>GetPixelViewPixels() returns the pixel view pixel_wands.</p></ol>
319 <p>The format of the GetPixelViewPixels method is:</p>
322 PixelWand *GetPixelViewPixels(const PixelView *pixel_view)
325 <p>A description of each parameter follows:</p></ol>
328 <ol><p>the pixel view.</p></ol>
331 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
332 _8c.html" target="source" name="GetPixelViewWand">GetPixelViewWand</a></h2>
333 <div class="doc-section">
335 <p>GetPixelViewWand() returns the magick wand associated with the pixel view.</p></ol>
337 <p>The format of the GetPixelViewWand method is:</p>
340 MagickWand *GetPixelViewWand(const PixelView *pixel_view)
343 <p>A description of each parameter follows:</p></ol>
346 <ol><p>the pixel view.</p></ol>
349 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
350 _8c.html" target="source" name="GetPixelViewWidth">GetPixelViewWidth</a></h2>
351 <div class="doc-section">
353 <p>GetPixelViewWidth() returns the pixel view width.</p></ol>
355 <p>The format of the GetPixelViewWidth method is:</p>
358 size_t GetPixelViewWidth(const PixelView *pixel_view)
361 <p>A description of each parameter follows:</p></ol>
364 <ol><p>the pixel view.</p></ol>
367 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
368 _8c.html" target="source" name="GetPixelViewX">GetPixelViewX</a></h2>
369 <div class="doc-section">
371 <p>GetPixelViewX() returns the pixel view x offset.</p></ol>
373 <p>The format of the GetPixelViewX method is:</p>
376 ssize_t GetPixelViewX(const PixelView *pixel_view)
379 <p>A description of each parameter follows:</p></ol>
382 <ol><p>the pixel view.</p></ol>
385 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
386 _8c.html" target="source" name="GetPixelViewY">GetPixelViewY</a></h2>
387 <div class="doc-section">
389 <p>GetPixelViewY() returns the pixel view y offset.</p></ol>
391 <p>The format of the GetPixelViewY method is:</p>
394 ssize_t GetPixelViewY(const PixelView *pixel_view)
397 <p>A description of each parameter follows:</p></ol>
400 <ol><p>the pixel view.</p></ol>
403 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
404 _8c.html" target="source" name="IsPixelView">IsPixelView</a></h2>
405 <div class="doc-section">
407 <p>IsPixelView() returns MagickTrue if the the parameter is verified as a pixel view container.</p></ol>
409 <p>The format of the IsPixelView method is:</p>
412 MagickBooleanType IsPixelView(const PixelView *pixel_view)
415 <p>A description of each parameter follows:</p></ol>
418 <ol><p>the pixel view.</p></ol>
421 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
422 _8c.html" target="source" name="NewPixelView">NewPixelView</a></h2>
423 <div class="doc-section">
425 <p>NewPixelView() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
427 <p>The format of the NewPixelView method is:</p>
430 PixelView *NewPixelView(MagickWand *wand)
433 <p>A description of each parameter follows:</p></ol>
436 <ol><p>the wand.</p></ol>
439 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
440 _8c.html" target="source" name="NewPixelViewRegion">NewPixelViewRegion</a></h2>
441 <div class="doc-section">
443 <p>NewPixelViewRegion() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
445 <p>The format of the NewPixelViewRegion method is:</p>
448 PixelView *NewPixelViewRegion(MagickWand *wand,const ssize_t x,
449 const ssize_t y,const size_t width,const size_t height)
452 <p>A description of each parameter follows:</p></ol>
455 <ol><p>the magick wand.</p></ol>
457 <h5>x,y,columns,rows</h5>
458 <ol><p>These values define the perimeter of a region of pixel_wands view.</p></ol>
461 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
462 _8c.html" target="source" name="SetPixelViewIterator">SetPixelViewIterator</a></h2>
463 <div class="doc-section">
465 <p>SetPixelViewIterator() iterates over the pixel view in parallel and calls your set method for each scanline of the view. The pixel region 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></ol>
467 <p>Use this pragma:</p>
473 <p>to define a section of code in your callback set method that must be executed by a single thread at a time.</p></ol>
475 <p>The format of the SetPixelViewIterator method is:</p>
478 MagickBooleanType SetPixelViewIterator(PixelView *destination,
479 SetPixelViewMethod set,void *context)
482 <p>A description of each parameter follows:</p></ol>
485 <ol><p>the pixel view.</p></ol>
488 <ol><p>the set callback method.</p></ol>
491 <ol><p>the user defined context.</p></ol>
494 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
495 _8c.html" target="source" name="TransferPixelViewIterator">TransferPixelViewIterator</a></h2>
496 <div class="doc-section">
498 <p>TransferPixelViewIterator() iterates over two pixel views in parallel and calls your transfer method for each scanline of the view. The source pixel region 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 pixel view is confined to the image canvas-- that is no negative offsets or widths or heights that exceed the image dimension are permitted.</p></ol>
500 <p>Use this pragma:</p>
506 <p>to define a section of code in your callback transfer method that must be executed by a single thread at a time.</p></ol>
508 <p>The format of the TransferPixelViewIterator method is:</p>
511 MagickBooleanType TransferPixelViewIterator(PixelView *source,
512 PixelView *destination,TransferPixelViewMethod transfer,void *context)
515 <p>A description of each parameter follows:</p></ol>
518 <ol><p>the source pixel view.</p></ol>
521 <ol><p>the destination pixel view.</p></ol>
524 <ol><p>the transfer callback method.</p></ol>
527 <ol><p>the user defined context.</p></ol>
530 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
531 _8c.html" target="source" name="UpdatePixelViewIterator">UpdatePixelViewIterator</a></h2>
532 <div class="doc-section">
534 <p>UpdatePixelViewIterator() iterates over the pixel view in parallel and calls your update method for each scanline of the view. The pixel region 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></ol>
536 <p>Use this pragma:</p>
542 <p>to define a section of code in your callback update method that must be executed by a single thread at a time.</p></ol>
544 <p>The format of the UpdatePixelViewIterator method is:</p>
547 MagickBooleanType UpdatePixelViewIterator(PixelView *source,
548 UpdatePixelViewMethod update,void *context)
551 <p>A description of each parameter follows:</p></ol>
554 <ol><p>the source pixel view.</p></ol>
557 <ol><p>the update callback method.</p></ol>
560 <ol><p>the user defined context.</p></ol>
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