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214 <h1>Module cache-view Methods</h1>
215 <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>
217 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireCacheView">AcquireCacheView</a></h2>
218 <div class="doc-section">
220 <p>AcquireCacheView() acquires a view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
222 <p>The format of the AcquireCacheView method is:</p>
225 CacheView *AcquireCacheView(const Image *image)
228 <p>A description of each parameter follows:</p>
234 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
235 <div class="doc-section">
237 <p>CloneCacheView() makes an exact copy of the specified cache view.</p>
239 <p>The format of the CloneCacheView method is:</p>
242 CacheView *CloneCacheView(const CacheView *cache_view)
245 <p>A description of each parameter follows:</p>
248 <p>the cache view.</p>
251 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
252 <div class="doc-section">
254 <p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireCacheView().</p>
256 <p>The format of the DestroyCacheView method is:</p>
259 CacheView *DestroyCacheView(CacheView *cache_view)
262 <p>A description of each parameter follows:</p>
265 <p>the cache view.</p>
268 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewChannels">GetCacheViewChannels</a></h2>
269 <div class="doc-section">
271 <p>GetCacheViewChannels() returns the image pixel channels associated with the specified view.</p>
273 <p>The format of the GetCacheViewChannels method is:</p>
276 size_t GetCacheViewChannels(const CacheView *cache_view)
279 <p>A description of each parameter follows:</p>
282 <p>the cache view.</p>
285 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
286 <div class="doc-section">
288 <p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
290 <p>The format of the GetCacheViewColorspace method is:</p>
293 ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
296 <p>A description of each parameter follows:</p>
299 <p>the cache view.</p>
302 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
303 <div class="doc-section">
305 <p>GetCacheViewException() returns the image exception associated with the specified view.</p>
307 <p>The format of the GetCacheViewException method is:</p>
310 ExceptionInfo GetCacheViewException(const CacheView *cache_view)
313 <p>A description of each parameter follows:</p>
316 <p>the cache view.</p>
319 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
320 <div class="doc-section">
322 <p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
324 <p>The format of the GetCacheViewStorageClass method is:</p>
327 ClassType GetCacheViewStorageClass(const CacheView *cache_view)
330 <p>A description of each parameter follows:</p>
333 <p>the cache view.</p>
336 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
337 <div class="doc-section">
339 <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>
341 <p>The format of the GetCacheViewAuthenticPixels method is:</p>
344 PixelPacket *GetCacheViewAuthenticPixels(CacheView *cache_view,
345 const ssize_t x,const ssize_t y,const size_t columns,
346 const size_t rows,ExceptionInfo *exception)
349 <p>A description of each parameter follows:</p>
352 <p>the cache view.</p>
354 <h5>x,y,columns,rows</h5>
355 <p>These values define the perimeter of a region of pixels.</p>
358 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
359 <div class="doc-section">
361 <p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
363 <p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
366 MagickBooleaNType GetOneCacheViewAuthenticPixel(
367 const CacheView *cache_view,const ssize_t x,const ssize_t y,
368 Pixelpacket *pixel,ExceptionInfo *exception)
371 <p>A description of each parameter follows:</p>
374 <p>the cache view.</p>
377 <p>These values define the offset of the pixel.</p>
380 <p>return a pixel at the specified (x,y) location.</p>
383 <p>return any errors or warnings in this structure.</p>
386 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a></h2>
387 <div class="doc-section">
389 <p>GetCacheViewAuthenticIndexQueue() returns the indexes associated with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticIndexQueue(). The indexes are authentic and can be updated.</p>
391 <p>The format of the GetCacheViewAuthenticIndexQueue() method is:</p>
394 IndexPacket *GetCacheViewAuthenticIndexQueue(CacheView *cache_view)
397 <p>A description of each parameter follows:</p>
400 <p>the cache view.</p>
403 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
404 <div class="doc-section">
406 <p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
408 <p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
411 PixelPacket *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
414 <p>A description of each parameter follows:</p>
417 <p>the cache view.</p>
420 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a></h2>
421 <div class="doc-section">
423 <p>GetCacheViewVirtualIndexQueue() returns the indexes associated with the last call to GetCacheViewVirtualIndexQueue(). The indexes are virtual and therefore cannot be updated.</p>
425 <p>The format of the GetCacheViewVirtualIndexQueue() method is:</p>
428 const IndexPacket *GetCacheViewVirtualIndexQueue(
429 const CacheView *cache_view)
432 <p>A description of each parameter follows:</p>
435 <p>the cache view.</p>
438 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
439 <div class="doc-section">
441 <p>GetCacheViewVirtualPixelQueue() returns the the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
443 <p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
446 const PixelPacket *GetCacheViewVirtualPixelQueue(
447 const CacheView *cache_view)
450 <p>A description of each parameter follows:</p>
453 <p>the cache view.</p>
456 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
457 <div class="doc-section">
459 <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>
461 <p>The format of the GetCacheViewVirtualPixels method is:</p>
464 const PixelPacket *GetCacheViewVirtualPixels(
465 const CacheView *cache_view,const ssize_t x,const ssize_t y,
466 const size_t columns,const size_t rows,ExceptionInfo *exception)
469 <p>A description of each parameter follows:</p>
472 <p>the cache view.</p>
474 <h5>x,y,columns,rows</h5>
475 <p>These values define the perimeter of a region of pixels.</p>
478 <p>return any errors or warnings in this structure.</p>
481 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
482 <div class="doc-section">
484 <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>
486 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
489 MagickBooleanType GetOneCacheViewVirtualPixel(
490 const CacheView *cache_view,const ssize_t x,const ssize_t y,
491 PixelPacket *pixel,ExceptionInfo *exception)
494 <p>A description of each parameter follows:</p>
497 <p>the cache view.</p>
500 <p>These values define the offset of the pixel.</p>
503 <p>return a pixel at the specified (x,y) location.</p>
506 <p>return any errors or warnings in this structure.</p>
509 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
510 <div class="doc-section">
512 <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>
514 <p>The format of the GetOneCacheViewVirtualPixel method is:</p>
517 MagickBooleanType GetOneCacheViewVirtualMethodPixel(
518 const CacheView *cache_view,
519 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
520 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
523 <p>A description of each parameter follows:</p>
526 <p>the cache view.</p>
528 <h5>virtual_pixel_method</h5>
529 <p>the virtual pixel method.</p>
532 <p>These values define the offset of the pixel.</p>
535 <p>return a pixel at the specified (x,y) location.</p>
538 <p>return any errors or warnings in this structure.</p>
541 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
542 <div class="doc-section">
544 <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>
546 <p>The format of the QueueCacheViewAuthenticPixels method is:</p>
549 PixelPacket *QueueCacheViewAuthenticPixels(CacheView *cache_view,
550 const ssize_t x,const ssize_t y,const size_t columns,
551 const size_t rows,ExceptionInfo *exception)
554 <p>A description of each parameter follows:</p>
557 <p>the cache view.</p>
559 <h5>x,y,columns,rows</h5>
560 <p>These values define the perimeter of a region of pixels.</p>
563 <p>return any errors or warnings in this structure.</p>
566 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
567 <div class="doc-section">
569 <p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
571 <p>The format of the SetCacheViewStorageClass method is:</p>
574 MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
575 const ClassType storage_class)
578 <p>A description of each parameter follows:</p>
581 <p>the cache view.</p>
583 <h5>storage_class</h5>
584 <p>the image storage class: PseudoClass or DirectClass.</p>
587 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
588 <div class="doc-section">
590 <p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
592 <p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
595 MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
596 const VirtualPixelMethod virtual_pixel_method)
599 <p>A description of each parameter follows:</p>
602 <p>the cache view.</p>
604 <h5>virtual_pixel_method</h5>
605 <p>the virtual pixel method.</p>
608 <h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
609 <div class="doc-section">
611 <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>
613 <p>The format of the SyncCacheViewAuthenticPixels method is:</p>
616 MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
617 ExceptionInfo *exception)
620 <p>A description of each parameter follows:</p>
623 <p>the cache view.</p>
626 <p>return any errors or warnings in this structure.</p>
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