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239 <h1>Module cache-view Methods</h1>
240 <p class="navigation-index">[<a href="cache-view.html#AcquireAuthenticCacheView">AcquireAuthenticCacheView</a> • <a href="cache-view.html#AcquireVirtualCacheView">AcquireVirtualCacheView</a> • <a href="cache-view.html#CloneCacheView">CloneCacheView</a> • <a href="cache-view.html#DestroyCacheView">DestroyCacheView</a> • <a href="cache-view.html#GetCacheViewChannels">GetCacheViewChannels</a> • <a href="cache-view.html#GetCacheViewColorspace">GetCacheViewColorspace</a> • <a href="cache-view.html#GetCacheViewException">GetCacheViewException</a> • <a href="cache-view.html#GetCacheViewStorageClass">GetCacheViewStorageClass</a> • <a href="cache-view.html#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> • <a href="cache-view.html#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> • <a href="cache-view.html#GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a> • <a href="cache-view.html#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> • <a href="cache-view.html#GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a> • <a href="cache-view.html#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> • <a href="cache-view.html#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> • <a href="cache-view.html#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> • <a href="cache-view.html#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> • <a href="cache-view.html#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> • <a href="cache-view.html#SetCacheViewStorageClass">SetCacheViewStorageClass</a> • <a href="cache-view.html#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> • <a href="cache-view.html#SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a>]</p>
242 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireAuthenticCacheView">AcquireAuthenticCacheView</a></h2>
243 <div class="doc-section">
245 <p>AcquireAuthenticCacheView() acquires an authentic view into the pixel cache.</p>
247 <p>The format of the AcquireAuthenticCacheView method is:</p>
250 CacheView *AcquireAuthenticCacheView(const Image *image,
251 ExceptionInfo *exception)
254 <p>A description of each parameter follows:</p>
260 <p>return any errors or warnings in this structure.</p>
263 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireVirtualCacheView">AcquireVirtualCacheView</a></h2>
264 <div class="doc-section">
266 <p>AcquireVirtualCacheView() acquires a virtual view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
268 <p>The format of the AcquireVirtualCacheView method is:</p>
271 CacheView *AcquireVirtualCacheView(const Image *image,
272 ExceptionInfo *exception)
275 <p>A description of each parameter follows:</p>
281 <p>return any errors or warnings in this structure.</p>
284 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
285 <div class="doc-section">
287 <p>CloneCacheView() makes an exact copy of the specified cache view.</p>
289 <p>The format of the CloneCacheView method is:</p>
292 CacheView *CloneCacheView(const CacheView *cache_view)
295 <p>A description of each parameter follows:</p>
298 <p>the cache view.</p>
301 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
302 <div class="doc-section">
304 <p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireVirtualCacheView().</p>
306 <p>The format of the DestroyCacheView method is:</p>
309 CacheView *DestroyCacheView(CacheView *cache_view)
312 <p>A description of each parameter follows:</p>
315 <p>the cache view.</p>
318 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewChannels">GetCacheViewChannels</a></h2>
319 <div class="doc-section">
321 <p>GetCacheViewChannels() returns the image pixel channels associated with the specified view.</p>
323 <p>The format of the GetCacheViewChannels method is:</p>
326 size_t GetCacheViewChannels(const CacheView *cache_view)
329 <p>A description of each parameter follows:</p>
332 <p>the cache view.</p>
335 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
336 <div class="doc-section">
338 <p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
340 <p>The format of the GetCacheViewColorspace method is:</p>
343 ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
346 <p>A description of each parameter follows:</p>
349 <p>the cache view.</p>
352 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
353 <div class="doc-section">
355 <p>GetCacheViewException() returns the image exception associated with the specified view.</p>
357 <p>The format of the GetCacheViewException method is:</p>
360 ExceptionInfo GetCacheViewException(const CacheView *cache_view)
363 <p>A description of each parameter follows:</p>
366 <p>the cache view.</p>
369 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
370 <div class="doc-section">
372 <p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
374 <p>The format of the GetCacheViewStorageClass method is:</p>
377 ClassType GetCacheViewStorageClass(const CacheView *cache_view)
380 <p>A description of each parameter follows:</p>
383 <p>the cache view.</p>
386 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
387 <div class="doc-section">
389 <p>GetCacheViewAuthenticPixels() gets pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
391 <p>The format of the GetCacheViewAuthenticPixels method is:</p>
394 PixelPacket *GetCacheViewAuthenticPixels(CacheView *cache_view,
395 const ssize_t x,const ssize_t y,const size_t columns,
396 const size_t rows,ExceptionInfo *exception)
399 <p>A description of each parameter follows:</p>
402 <p>the cache view.</p>
404 <h5>x,y,columns,rows</h5>
405 <p>These values define the perimeter of a region of pixels.</p>
408 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
409 <div class="doc-section">
411 <p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
413 <p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
416 MagickBooleaNType GetOneCacheViewAuthenticPixel(
417 const CacheView *cache_view,const ssize_t x,const ssize_t y,
418 Pixelpacket *pixel,ExceptionInfo *exception)
421 <p>A description of each parameter follows:</p>
424 <p>the cache view.</p>
427 <p>These values define the offset of the pixel.</p>
430 <p>return a pixel at the specified (x,y) location.</p>
433 <p>return any errors or warnings in this structure.</p>
436 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a></h2>
437 <div class="doc-section">
439 <p>GetCacheViewAuthenticIndexQueue() returns the indexes associated with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticIndexQueue(). The indexes are authentic and can be updated.</p>
441 <p>The format of the GetCacheViewAuthenticIndexQueue() method is:</p>
444 IndexPacket *GetCacheViewAuthenticIndexQueue(CacheView *cache_view)
447 <p>A description of each parameter follows:</p>
450 <p>the cache view.</p>
453 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
454 <div class="doc-section">
456 <p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
458 <p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
461 PixelPacket *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
464 <p>A description of each parameter follows:</p>
467 <p>the cache view.</p>
470 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a></h2>
471 <div class="doc-section">
473 <p>GetCacheViewVirtualIndexQueue() returns the indexes associated with the last call to GetCacheViewVirtualIndexQueue(). The indexes are virtual and therefore cannot be updated.</p>
475 <p>The format of the GetCacheViewVirtualIndexQueue() method is:</p>
478 const IndexPacket *GetCacheViewVirtualIndexQueue(
479 const CacheView *cache_view)
482 <p>A description of each parameter follows:</p>
485 <p>the cache view.</p>
488 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
489 <div class="doc-section">
491 <p>GetCacheViewVirtualPixelQueue() returns the the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
493 <p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
496 const PixelPacket *GetCacheViewVirtualPixelQueue(
497 const CacheView *cache_view)
500 <p>A description of each parameter follows:</p>
503 <p>the cache view.</p>
506 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
507 <div class="doc-section">
509 <p>GetCacheViewVirtualPixels() gets virtual pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
511 <p>The format of the GetCacheViewVirtualPixels method is:</p>
514 const PixelPacket *GetCacheViewVirtualPixels(
515 const CacheView *cache_view,const ssize_t x,const ssize_t y,
516 const size_t columns,const size_t rows,ExceptionInfo *exception)
519 <p>A description of each parameter follows:</p>
522 <p>the cache view.</p>
524 <h5>x,y,columns,rows</h5>
525 <p>These values define the perimeter of a region of pixels.</p>
528 <p>return any errors or warnings in this structure.</p>
531 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
532 <div class="doc-section">
534 <p>GetOneCacheViewVirtualPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.</p>
536 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
539 MagickBooleanType GetOneCacheViewVirtualPixel(
540 const CacheView *cache_view,const ssize_t x,const ssize_t y,
541 PixelPacket *pixel,ExceptionInfo *exception)
544 <p>A description of each parameter follows:</p>
547 <p>the cache view.</p>
550 <p>These values define the offset of the pixel.</p>
553 <p>return a pixel at the specified (x,y) location.</p>
556 <p>return any errors or warnings in this structure.</p>
559 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
560 <div class="doc-section">
562 <p>GetOneCacheViewVirtualMethodPixel() returns a single virtual pixel at the specified (x,y) location. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneCacheViewAuthenticPixel() instead.</p>
564 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
567 MagickBooleanType GetOneCacheViewVirtualMethodPixel(
568 const CacheView *cache_view,
569 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
570 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
573 <p>A description of each parameter follows:</p>
576 <p>the cache view.</p>
578 <h5>virtual_pixel_method</h5>
579 <p>the virtual pixel method.</p>
582 <p>These values define the offset of the pixel.</p>
585 <p>return a pixel at the specified (x,y) location.</p>
588 <p>return any errors or warnings in this structure.</p>
591 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
592 <div class="doc-section">
594 <p>QueueCacheViewAuthenticPixels() queues authentic pixels from the in-memory or disk pixel cache as defined by the geometry parameters. A pointer to the pixels is returned if the pixels are transferred, otherwise a NULL is returned.</p>
596 <p>The format of the QueueCacheViewAuthenticPixels method is:</p>
599 PixelPacket *QueueCacheViewAuthenticPixels(CacheView *cache_view,
600 const ssize_t x,const ssize_t y,const size_t columns,
601 const size_t rows,ExceptionInfo *exception)
604 <p>A description of each parameter follows:</p>
607 <p>the cache view.</p>
609 <h5>x,y,columns,rows</h5>
610 <p>These values define the perimeter of a region of pixels.</p>
613 <p>return any errors or warnings in this structure.</p>
616 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
617 <div class="doc-section">
619 <p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
621 <p>The format of the SetCacheViewStorageClass method is:</p>
624 MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
625 const ClassType storage_class)
628 <p>A description of each parameter follows:</p>
631 <p>the cache view.</p>
633 <h5>storage_class</h5>
634 <p>the image storage class: PseudoClass or DirectClass.</p>
637 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
638 <div class="doc-section">
640 <p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
642 <p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
645 MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
646 const VirtualPixelMethod virtual_pixel_method)
649 <p>A description of each parameter follows:</p>
652 <p>the cache view.</p>
654 <h5>virtual_pixel_method</h5>
655 <p>the virtual pixel method.</p>
658 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
659 <div class="doc-section">
661 <p>SyncCacheViewAuthenticPixels() saves the cache view pixels to the in-memory or disk cache. It returns MagickTrue if the pixel region is flushed, otherwise MagickFalse.</p>
663 <p>The format of the SyncCacheViewAuthenticPixels method is:</p>
666 MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
667 ExceptionInfo *exception)
670 <p>A description of each parameter follows:</p>
673 <p>the cache view.</p>
676 <p>return any errors or warnings in this structure.</p>
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