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11 <title>ImageMagick: MagickWand, C API for ImageMagick: Pixel View Methods</title>
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151 <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>
153 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
154 _8c.html" target="source" name="ClonePixelView">ClonePixelView</a></h2>
155 <div class="doc-section">
157 <p>ClonePixelView() makes a copy of the specified pixel view.</p></ol>
159 <p>The format of the ClonePixelView method is:</p>
162 PixelView *ClonePixelView(const PixelView *pixel_view)
165 <p>A description of each parameter follows:</p></ol>
168 <ol><p>the pixel view.</p></ol>
171 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
172 _8c.html" target="source" name="DestroyPixelView">DestroyPixelView</a></h2>
173 <div class="doc-section">
175 <p>DestroyPixelView() deallocates memory associated with a pixel view.</p></ol>
177 <p>The format of the DestroyPixelView method is:</p>
180 PixelView *DestroyPixelView(PixelView *pixel_view,
181 const unsigned long number_wands,const unsigned long number_threads)
184 <p>A description of each parameter follows:</p></ol>
187 <ol><p>the pixel view.</p></ol>
190 <ol><p>the number of pixel wands.</p></ol>
192 <h5>number_threads</h5>
193 <ol><p>number of threads.</p></ol>
196 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
197 _8c.html" target="source" name="DuplexTransferPixelViewIterator">DuplexTransferPixelViewIterator</a></h2>
198 <div class="doc-section">
200 <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>
202 <p>Use this pragma:</p>
208 <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>
210 <p>The format of the DuplexTransferPixelViewIterator method is:</p>
213 MagickBooleanType DuplexTransferPixelViewIterator(PixelView *source,
214 PixelView *duplex,PixelView *destination,
215 DuplexTransferPixelViewMethod transfer,void *context)
218 <p>A description of each parameter follows:</p></ol>
221 <ol><p>the source pixel view.</p></ol>
224 <ol><p>the duplex pixel view.</p></ol>
227 <ol><p>the destination pixel view.</p></ol>
230 <ol><p>the transfer callback method.</p></ol>
233 <ol><p>the user defined context.</p></ol>
236 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
237 _8c.html" target="source" name="GetPixelViewException">GetPixelViewException</a></h2>
238 <div class="doc-section">
240 <p>GetPixelViewException() returns the severity, reason, and description of any error that occurs when utilizing a pixel view.</p></ol>
242 <p>The format of the GetPixelViewException method is:</p>
245 char *GetPixelViewException(const PixelWand *pixel_view,
246 ExceptionType *severity)
249 <p>A description of each parameter follows:</p></ol>
252 <ol><p>the pixel pixel_view.</p></ol>
255 <ol><p>the severity of the error is returned here.</p></ol>
258 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
259 _8c.html" target="source" name="GetPixelViewHeight">GetPixelViewHeight</a></h2>
260 <div class="doc-section">
262 <p>GetPixelViewHeight() returns the pixel view height.</p></ol>
264 <p>The format of the GetPixelViewHeight method is:</p>
267 unsigned long GetPixelViewHeight(const PixelView *pixel_view)
270 <p>A description of each parameter follows:</p></ol>
273 <ol><p>the pixel view.</p></ol>
276 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
277 _8c.html" target="source" name="GetPixelViewIterator">GetPixelViewIterator</a></h2>
278 <div class="doc-section">
280 <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>
282 <p>Use this pragma:</p>
288 <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>
290 <p>The format of the GetPixelViewIterator method is:</p>
293 MagickBooleanType GetPixelViewIterator(PixelView *source,
294 GetPixelViewMethod get,void *context)
297 <p>A description of each parameter follows:</p></ol>
300 <ol><p>the source pixel view.</p></ol>
303 <ol><p>the get callback method.</p></ol>
306 <ol><p>the user defined context.</p></ol>
309 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
310 _8c.html" target="source" name="GetPixelViewPixels">GetPixelViewPixels</a></h2>
311 <div class="doc-section">
313 <p>GetPixelViewPixels() returns the pixel view pixel_wands.</p></ol>
315 <p>The format of the GetPixelViewPixels method is:</p>
318 PixelWand *GetPixelViewPixels(const PixelView *pixel_view)
321 <p>A description of each parameter follows:</p></ol>
324 <ol><p>the pixel view.</p></ol>
327 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
328 _8c.html" target="source" name="GetPixelViewWand">GetPixelViewWand</a></h2>
329 <div class="doc-section">
331 <p>GetPixelViewWand() returns the magick wand associated with the pixel view.</p></ol>
333 <p>The format of the GetPixelViewWand method is:</p>
336 MagickWand *GetPixelViewWand(const PixelView *pixel_view)
339 <p>A description of each parameter follows:</p></ol>
342 <ol><p>the pixel view.</p></ol>
345 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
346 _8c.html" target="source" name="GetPixelViewWidth">GetPixelViewWidth</a></h2>
347 <div class="doc-section">
349 <p>GetPixelViewWidth() returns the pixel view width.</p></ol>
351 <p>The format of the GetPixelViewWidth method is:</p>
354 unsigned long GetPixelViewWidth(const PixelView *pixel_view)
357 <p>A description of each parameter follows:</p></ol>
360 <ol><p>the pixel view.</p></ol>
363 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
364 _8c.html" target="source" name="GetPixelViewX">GetPixelViewX</a></h2>
365 <div class="doc-section">
367 <p>GetPixelViewX() returns the pixel view x offset.</p></ol>
369 <p>The format of the GetPixelViewX method is:</p>
372 long GetPixelViewX(const PixelView *pixel_view)
375 <p>A description of each parameter follows:</p></ol>
378 <ol><p>the pixel view.</p></ol>
381 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
382 _8c.html" target="source" name="GetPixelViewY">GetPixelViewY</a></h2>
383 <div class="doc-section">
385 <p>GetPixelViewY() returns the pixel view y offset.</p></ol>
387 <p>The format of the GetPixelViewY method is:</p>
390 long GetPixelViewY(const PixelView *pixel_view)
393 <p>A description of each parameter follows:</p></ol>
396 <ol><p>the pixel view.</p></ol>
399 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
400 _8c.html" target="source" name="IsPixelView">IsPixelView</a></h2>
401 <div class="doc-section">
403 <p>IsPixelView() returns MagickTrue if the the parameter is verified as a pixel view container.</p></ol>
405 <p>The format of the IsPixelView method is:</p>
408 MagickBooleanType IsPixelView(const PixelView *pixel_view)
411 <p>A description of each parameter follows:</p></ol>
414 <ol><p>the pixel view.</p></ol>
417 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
418 _8c.html" target="source" name="NewPixelView">NewPixelView</a></h2>
419 <div class="doc-section">
421 <p>NewPixelView() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
423 <p>The format of the NewPixelView method is:</p>
426 PixelView *NewPixelView(MagickWand *wand)
429 <p>A description of each parameter follows:</p></ol>
432 <ol><p>the wand.</p></ol>
435 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
436 _8c.html" target="source" name="NewPixelViewRegion">NewPixelViewRegion</a></h2>
437 <div class="doc-section">
439 <p>NewPixelViewRegion() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
441 <p>The format of the NewPixelViewRegion method is:</p>
444 PixelView *NewPixelViewRegion(MagickWand *wand,const long x,
445 const long y,const unsigned long width,const unsigned long height)
448 <p>A description of each parameter follows:</p></ol>
451 <ol><p>the magick wand.</p></ol>
453 <h5>x,y,columns,rows</h5>
454 <ol><p>These values define the perimeter of a region of pixel_wands view.</p></ol>
457 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
458 _8c.html" target="source" name="SetPixelViewIterator">SetPixelViewIterator</a></h2>
459 <div class="doc-section">
461 <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>
463 <p>Use this pragma:</p>
469 <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>
471 <p>The format of the SetPixelViewIterator method is:</p>
474 MagickBooleanType SetPixelViewIterator(PixelView *destination,
475 SetPixelViewMethod set,void *context)
478 <p>A description of each parameter follows:</p></ol>
481 <ol><p>the pixel view.</p></ol>
484 <ol><p>the set callback method.</p></ol>
487 <ol><p>the user defined context.</p></ol>
490 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
491 _8c.html" target="source" name="TransferPixelViewIterator">TransferPixelViewIterator</a></h2>
492 <div class="doc-section">
494 <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>
496 <p>Use this pragma:</p>
502 <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>
504 <p>The format of the TransferPixelViewIterator method is:</p>
507 MagickBooleanType TransferPixelViewIterator(PixelView *source,
508 PixelView *destination,TransferPixelViewMethod transfer,void *context)
511 <p>A description of each parameter follows:</p></ol>
514 <ol><p>the source pixel view.</p></ol>
517 <ol><p>the destination pixel view.</p></ol>
520 <ol><p>the transfer callback method.</p></ol>
523 <ol><p>the user defined context.</p></ol>
526 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
527 _8c.html" target="source" name="UpdatePixelViewIterator">UpdatePixelViewIterator</a></h2>
528 <div class="doc-section">
530 <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>
532 <p>Use this pragma:</p>
538 <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>
540 <p>The format of the UpdatePixelViewIterator method is:</p>
543 MagickBooleanType UpdatePixelViewIterator(PixelView *source,
544 UpdatePixelViewMethod update,void *context)
547 <p>A description of each parameter follows:</p></ol>
550 <ol><p>the source pixel view.</p></ol>
553 <ol><p>the update callback method.</p></ol>
556 <ol><p>the user defined context.</p></ol>
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