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11 <title>ImageMagick: MagickWand, C API for ImageMagick: Pixel View Methods</title>
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154 <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>
156 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
157 _8c.html" target="source" name="ClonePixelView">ClonePixelView</a></h2>
158 <div class="doc-section">
160 <p>ClonePixelView() makes a copy of the specified pixel view.</p></ol>
162 <p>The format of the ClonePixelView method is:</p>
165 PixelView *ClonePixelView(const PixelView *pixel_view)
168 <p>A description of each parameter follows:</p></ol>
171 <ol><p>the pixel view.</p></ol>
174 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
175 _8c.html" target="source" name="DestroyPixelView">DestroyPixelView</a></h2>
176 <div class="doc-section">
178 <p>DestroyPixelView() deallocates memory associated with a pixel view.</p></ol>
180 <p>The format of the DestroyPixelView method is:</p>
183 PixelView *DestroyPixelView(PixelView *pixel_view,
184 const unsigned long number_wands,const unsigned long number_threads)
187 <p>A description of each parameter follows:</p></ol>
190 <ol><p>the pixel view.</p></ol>
193 <ol><p>the number of pixel wands.</p></ol>
195 <h5>number_threads</h5>
196 <ol><p>number of threads.</p></ol>
199 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
200 _8c.html" target="source" name="DuplexTransferPixelViewIterator">DuplexTransferPixelViewIterator</a></h2>
201 <div class="doc-section">
203 <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>
205 <p>Use this pragma:</p>
211 <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>
213 <p>The format of the DuplexTransferPixelViewIterator method is:</p>
216 MagickBooleanType DuplexTransferPixelViewIterator(PixelView *source,
217 PixelView *duplex,PixelView *destination,
218 DuplexTransferPixelViewMethod transfer,void *context)
221 <p>A description of each parameter follows:</p></ol>
224 <ol><p>the source pixel view.</p></ol>
227 <ol><p>the duplex pixel view.</p></ol>
230 <ol><p>the destination pixel view.</p></ol>
233 <ol><p>the transfer callback method.</p></ol>
236 <ol><p>the user defined context.</p></ol>
239 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
240 _8c.html" target="source" name="GetPixelViewException">GetPixelViewException</a></h2>
241 <div class="doc-section">
243 <p>GetPixelViewException() returns the severity, reason, and description of any error that occurs when utilizing a pixel view.</p></ol>
245 <p>The format of the GetPixelViewException method is:</p>
248 char *GetPixelViewException(const PixelWand *pixel_view,
249 ExceptionType *severity)
252 <p>A description of each parameter follows:</p></ol>
255 <ol><p>the pixel pixel_view.</p></ol>
258 <ol><p>the severity of the error is returned here.</p></ol>
261 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
262 _8c.html" target="source" name="GetPixelViewHeight">GetPixelViewHeight</a></h2>
263 <div class="doc-section">
265 <p>GetPixelViewHeight() returns the pixel view height.</p></ol>
267 <p>The format of the GetPixelViewHeight method is:</p>
270 unsigned long GetPixelViewHeight(const PixelView *pixel_view)
273 <p>A description of each parameter follows:</p></ol>
276 <ol><p>the pixel view.</p></ol>
279 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
280 _8c.html" target="source" name="GetPixelViewIterator">GetPixelViewIterator</a></h2>
281 <div class="doc-section">
283 <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>
285 <p>Use this pragma:</p>
291 <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>
293 <p>The format of the GetPixelViewIterator method is:</p>
296 MagickBooleanType GetPixelViewIterator(PixelView *source,
297 GetPixelViewMethod get,void *context)
300 <p>A description of each parameter follows:</p></ol>
303 <ol><p>the source pixel view.</p></ol>
306 <ol><p>the get callback method.</p></ol>
309 <ol><p>the user defined context.</p></ol>
312 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
313 _8c.html" target="source" name="GetPixelViewPixels">GetPixelViewPixels</a></h2>
314 <div class="doc-section">
316 <p>GetPixelViewPixels() returns the pixel view pixel_wands.</p></ol>
318 <p>The format of the GetPixelViewPixels method is:</p>
321 PixelWand *GetPixelViewPixels(const PixelView *pixel_view)
324 <p>A description of each parameter follows:</p></ol>
327 <ol><p>the pixel view.</p></ol>
330 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
331 _8c.html" target="source" name="GetPixelViewWand">GetPixelViewWand</a></h2>
332 <div class="doc-section">
334 <p>GetPixelViewWand() returns the magick wand associated with the pixel view.</p></ol>
336 <p>The format of the GetPixelViewWand method is:</p>
339 MagickWand *GetPixelViewWand(const PixelView *pixel_view)
342 <p>A description of each parameter follows:</p></ol>
345 <ol><p>the pixel view.</p></ol>
348 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
349 _8c.html" target="source" name="GetPixelViewWidth">GetPixelViewWidth</a></h2>
350 <div class="doc-section">
352 <p>GetPixelViewWidth() returns the pixel view width.</p></ol>
354 <p>The format of the GetPixelViewWidth method is:</p>
357 unsigned long GetPixelViewWidth(const PixelView *pixel_view)
360 <p>A description of each parameter follows:</p></ol>
363 <ol><p>the pixel view.</p></ol>
366 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
367 _8c.html" target="source" name="GetPixelViewX">GetPixelViewX</a></h2>
368 <div class="doc-section">
370 <p>GetPixelViewX() returns the pixel view x offset.</p></ol>
372 <p>The format of the GetPixelViewX method is:</p>
375 long GetPixelViewX(const PixelView *pixel_view)
378 <p>A description of each parameter follows:</p></ol>
381 <ol><p>the pixel view.</p></ol>
384 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
385 _8c.html" target="source" name="GetPixelViewY">GetPixelViewY</a></h2>
386 <div class="doc-section">
388 <p>GetPixelViewY() returns the pixel view y offset.</p></ol>
390 <p>The format of the GetPixelViewY method is:</p>
393 long GetPixelViewY(const PixelView *pixel_view)
396 <p>A description of each parameter follows:</p></ol>
399 <ol><p>the pixel view.</p></ol>
402 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
403 _8c.html" target="source" name="IsPixelView">IsPixelView</a></h2>
404 <div class="doc-section">
406 <p>IsPixelView() returns MagickTrue if the the parameter is verified as a pixel view container.</p></ol>
408 <p>The format of the IsPixelView method is:</p>
411 MagickBooleanType IsPixelView(const PixelView *pixel_view)
414 <p>A description of each parameter follows:</p></ol>
417 <ol><p>the pixel view.</p></ol>
420 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
421 _8c.html" target="source" name="NewPixelView">NewPixelView</a></h2>
422 <div class="doc-section">
424 <p>NewPixelView() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
426 <p>The format of the NewPixelView method is:</p>
429 PixelView *NewPixelView(MagickWand *wand)
432 <p>A description of each parameter follows:</p></ol>
435 <ol><p>the wand.</p></ol>
438 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
439 _8c.html" target="source" name="NewPixelViewRegion">NewPixelViewRegion</a></h2>
440 <div class="doc-section">
442 <p>NewPixelViewRegion() returns a pixel view required for all other methods in the Pixel View API.</p></ol>
444 <p>The format of the NewPixelViewRegion method is:</p>
447 PixelView *NewPixelViewRegion(MagickWand *wand,const long x,
448 const long y,const unsigned long width,const unsigned long height)
451 <p>A description of each parameter follows:</p></ol>
454 <ol><p>the magick wand.</p></ol>
456 <h5>x,y,columns,rows</h5>
457 <ol><p>These values define the perimeter of a region of pixel_wands view.</p></ol>
460 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
461 _8c.html" target="source" name="SetPixelViewIterator">SetPixelViewIterator</a></h2>
462 <div class="doc-section">
464 <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>
466 <p>Use this pragma:</p>
472 <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>
474 <p>The format of the SetPixelViewIterator method is:</p>
477 MagickBooleanType SetPixelViewIterator(PixelView *destination,
478 SetPixelViewMethod set,void *context)
481 <p>A description of each parameter follows:</p></ol>
484 <ol><p>the pixel view.</p></ol>
487 <ol><p>the set callback method.</p></ol>
490 <ol><p>the user defined context.</p></ol>
493 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
494 _8c.html" target="source" name="TransferPixelViewIterator">TransferPixelViewIterator</a></h2>
495 <div class="doc-section">
497 <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>
499 <p>Use this pragma:</p>
505 <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>
507 <p>The format of the TransferPixelViewIterator method is:</p>
510 MagickBooleanType TransferPixelViewIterator(PixelView *source,
511 PixelView *destination,TransferPixelViewMethod transfer,void *context)
514 <p>A description of each parameter follows:</p></ol>
517 <ol><p>the source pixel view.</p></ol>
520 <ol><p>the destination pixel view.</p></ol>
523 <ol><p>the transfer callback method.</p></ol>
526 <ol><p>the user defined context.</p></ol>
529 <h2><a href="http://www.imagemagick.org/api/MagickWand/pixel-view
530 _8c.html" target="source" name="UpdatePixelViewIterator">UpdatePixelViewIterator</a></h2>
531 <div class="doc-section">
533 <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>
535 <p>Use this pragma:</p>
541 <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>
543 <p>The format of the UpdatePixelViewIterator method is:</p>
546 MagickBooleanType UpdatePixelViewIterator(PixelView *source,
547 UpdatePixelViewMethod update,void *context)
550 <p>A description of each parameter follows:</p></ol>
553 <ol><p>the source pixel view.</p></ol>
556 <ol><p>the update callback method.</p></ol>
559 <ol><p>the user defined context.</p></ol>
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