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218 <h1>Module cache-view Methods</h1>
219 <p class="navigation-index">[<a href="#AcquireCacheView">AcquireCacheView</a> • <a href="#CloneCacheView">CloneCacheView</a> • <a href="#DestroyCacheView">DestroyCacheView</a> • <a href="#GetCacheViewChannels">GetCacheViewChannels</a> • <a href="#GetCacheViewColorspace">GetCacheViewColorspace</a> • <a href="#GetCacheViewException">GetCacheViewException</a> • <a href="#GetCacheViewStorageClass">GetCacheViewStorageClass</a> • <a href="#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> • <a href="#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> • <a href="#GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a> • <a href="#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> • <a href="#GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a> • <a href="#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> • <a href="#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> • <a href="#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> • <a href="#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> • <a href="#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> • <a href="#SetCacheViewStorageClass">SetCacheViewStorageClass</a> • <a href="#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> • <a href="#SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a>]</p>
221 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireCacheView">AcquireCacheView</a></h2>
222 <div class="doc-section">
224 <p>AcquireCacheView() acquires a view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
226 <p>The format of the AcquireCacheView method is:</p>
229 CacheView *AcquireCacheView(const Image *image)
232 <p>A description of each parameter follows:</p>
238 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
239 <div class="doc-section">
241 <p>CloneCacheView() makes an exact copy of the specified cache view.</p>
243 <p>The format of the CloneCacheView method is:</p>
246 CacheView *CloneCacheView(const CacheView *cache_view)
249 <p>A description of each parameter follows:</p>
252 <p>the cache view.</p>
255 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
256 <div class="doc-section">
258 <p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireCacheView().</p>
260 <p>The format of the DestroyCacheView method is:</p>
263 CacheView *DestroyCacheView(CacheView *cache_view)
266 <p>A description of each parameter follows:</p>
269 <p>the cache view.</p>
272 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewChannels">GetCacheViewChannels</a></h2>
273 <div class="doc-section">
275 <p>GetCacheViewChannels() returns the image pixel channels associated with the specified view.</p>
277 <p>The format of the GetCacheViewChannels method is:</p>
280 size_t GetCacheViewChannels(const CacheView *cache_view)
283 <p>A description of each parameter follows:</p>
286 <p>the cache view.</p>
289 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
290 <div class="doc-section">
292 <p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
294 <p>The format of the GetCacheViewColorspace method is:</p>
297 ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
300 <p>A description of each parameter follows:</p>
303 <p>the cache view.</p>
306 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
307 <div class="doc-section">
309 <p>GetCacheViewException() returns the image exception associated with the specified view.</p>
311 <p>The format of the GetCacheViewException method is:</p>
314 ExceptionInfo GetCacheViewException(const CacheView *cache_view)
317 <p>A description of each parameter follows:</p>
320 <p>the cache view.</p>
323 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
324 <div class="doc-section">
326 <p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
328 <p>The format of the GetCacheViewStorageClass method is:</p>
331 ClassType GetCacheViewStorageClass(const CacheView *cache_view)
334 <p>A description of each parameter follows:</p>
337 <p>the cache view.</p>
340 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
341 <div class="doc-section">
343 <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>
345 <p>The format of the GetCacheViewAuthenticPixels method is:</p>
348 PixelPacket *GetCacheViewAuthenticPixels(CacheView *cache_view,
349 const ssize_t x,const ssize_t y,const size_t columns,
350 const size_t rows,ExceptionInfo *exception)
353 <p>A description of each parameter follows:</p>
356 <p>the cache view.</p>
358 <h5>x,y,columns,rows</h5>
359 <p>These values define the perimeter of a region of pixels.</p>
362 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
363 <div class="doc-section">
365 <p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
367 <p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
370 MagickBooleaNType GetOneCacheViewAuthenticPixel(
371 const CacheView *cache_view,const ssize_t x,const ssize_t y,
372 Pixelpacket *pixel,ExceptionInfo *exception)
375 <p>A description of each parameter follows:</p>
378 <p>the cache view.</p>
381 <p>These values define the offset of the pixel.</p>
384 <p>return a pixel at the specified (x,y) location.</p>
387 <p>return any errors or warnings in this structure.</p>
390 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a></h2>
391 <div class="doc-section">
393 <p>GetCacheViewAuthenticIndexQueue() returns the indexes associated with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticIndexQueue(). The indexes are authentic and can be updated.</p>
395 <p>The format of the GetCacheViewAuthenticIndexQueue() method is:</p>
398 IndexPacket *GetCacheViewAuthenticIndexQueue(CacheView *cache_view)
401 <p>A description of each parameter follows:</p>
404 <p>the cache view.</p>
407 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
408 <div class="doc-section">
410 <p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
412 <p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
415 PixelPacket *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
418 <p>A description of each parameter follows:</p>
421 <p>the cache view.</p>
424 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a></h2>
425 <div class="doc-section">
427 <p>GetCacheViewVirtualIndexQueue() returns the indexes associated with the last call to GetCacheViewVirtualIndexQueue(). The indexes are virtual and therefore cannot be updated.</p>
429 <p>The format of the GetCacheViewVirtualIndexQueue() method is:</p>
432 const IndexPacket *GetCacheViewVirtualIndexQueue(
433 const CacheView *cache_view)
436 <p>A description of each parameter follows:</p>
439 <p>the cache view.</p>
442 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
443 <div class="doc-section">
445 <p>GetCacheViewVirtualPixelQueue() returns the the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
447 <p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
450 const PixelPacket *GetCacheViewVirtualPixelQueue(
451 const CacheView *cache_view)
454 <p>A description of each parameter follows:</p>
457 <p>the cache view.</p>
460 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
461 <div class="doc-section">
463 <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>
465 <p>The format of the GetCacheViewVirtualPixels method is:</p>
468 const PixelPacket *GetCacheViewVirtualPixels(
469 const CacheView *cache_view,const ssize_t x,const ssize_t y,
470 const size_t columns,const size_t rows,ExceptionInfo *exception)
473 <p>A description of each parameter follows:</p>
476 <p>the cache view.</p>
478 <h5>x,y,columns,rows</h5>
479 <p>These values define the perimeter of a region of pixels.</p>
482 <p>return any errors or warnings in this structure.</p>
485 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
486 <div class="doc-section">
488 <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>
490 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
493 MagickBooleanType GetOneCacheViewVirtualPixel(
494 const CacheView *cache_view,const ssize_t x,const ssize_t y,
495 PixelPacket *pixel,ExceptionInfo *exception)
498 <p>A description of each parameter follows:</p>
501 <p>the cache view.</p>
504 <p>These values define the offset of the pixel.</p>
507 <p>return a pixel at the specified (x,y) location.</p>
510 <p>return any errors or warnings in this structure.</p>
513 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
514 <div class="doc-section">
516 <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>
518 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
521 MagickBooleanType GetOneCacheViewVirtualMethodPixel(
522 const CacheView *cache_view,
523 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
524 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
527 <p>A description of each parameter follows:</p>
530 <p>the cache view.</p>
532 <h5>virtual_pixel_method</h5>
533 <p>the virtual pixel method.</p>
536 <p>These values define the offset of the pixel.</p>
539 <p>return a pixel at the specified (x,y) location.</p>
542 <p>return any errors or warnings in this structure.</p>
545 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
546 <div class="doc-section">
548 <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>
550 <p>The format of the QueueCacheViewAuthenticPixels method is:</p>
553 PixelPacket *QueueCacheViewAuthenticPixels(CacheView *cache_view,
554 const ssize_t x,const ssize_t y,const size_t columns,
555 const size_t rows,ExceptionInfo *exception)
558 <p>A description of each parameter follows:</p>
561 <p>the cache view.</p>
563 <h5>x,y,columns,rows</h5>
564 <p>These values define the perimeter of a region of pixels.</p>
567 <p>return any errors or warnings in this structure.</p>
570 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
571 <div class="doc-section">
573 <p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
575 <p>The format of the SetCacheViewStorageClass method is:</p>
578 MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
579 const ClassType storage_class)
582 <p>A description of each parameter follows:</p>
585 <p>the cache view.</p>
587 <h5>storage_class</h5>
588 <p>the image storage class: PseudoClass or DirectClass.</p>
591 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
592 <div class="doc-section">
594 <p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
596 <p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
599 MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
600 const VirtualPixelMethod virtual_pixel_method)
603 <p>A description of each parameter follows:</p>
606 <p>the cache view.</p>
608 <h5>virtual_pixel_method</h5>
609 <p>the virtual pixel method.</p>
612 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
613 <div class="doc-section">
615 <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>
617 <p>The format of the SyncCacheViewAuthenticPixels method is:</p>
620 MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
621 ExceptionInfo *exception)
624 <p>A description of each parameter follows:</p>
627 <p>the cache view.</p>
630 <p>return any errors or warnings in this structure.</p>
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