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cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]215<h1>Module cache-view Methods</h1>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]216<p class="navigation-index">[<a href="#AcquireCacheView">AcquireCacheView</a> &bull; <a href="#CloneCacheView">CloneCacheView</a> &bull; <a href="#DestroyCacheView">DestroyCacheView</a> &bull; <a href="#GetCacheViewColorspace">GetCacheViewColorspace</a> &bull; <a href="#GetCacheViewException">GetCacheViewException</a> &bull; <a href="#GetCacheViewStorageClass">GetCacheViewStorageClass</a> &bull; <a href="#GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a> &bull; <a href="#GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a> &bull; <a href="#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> &bull; <a href="#GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a> &bull; <a href="#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> &bull; <a href="#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a> &bull; <a href="#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> &bull; <a href="#GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a> &bull; <a href="#GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a> &bull; <a href="#QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a> &bull; <a href="#SetCacheViewStorageClass">SetCacheViewStorageClass</a> &bull; <a href="#SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a> &bull; <a href="#SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]217
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]218<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="AcquireCacheView">AcquireCacheView</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]219<div class="doc-section">
220
221<p>AcquireCacheView() acquires a view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
222
223<p>The format of the AcquireCacheView method is:</p>
224
225<pre class="code">
226 CacheView *AcquireCacheView(const Image *image)
227</pre>
228
229<p>A description of each parameter follows:</p>
230
231<h5>image</h5>
232<p>the image.</p>
233
234 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]235<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]236<div class="doc-section">
237
238<p>CloneCacheView() makes an exact copy of the specified cache view.</p>
239
240<p>The format of the CloneCacheView method is:</p>
241
242<pre class="code">
243 CacheView *CloneCacheView(const CacheView *cache_view)
244</pre>
245
246<p>A description of each parameter follows:</p>
247
248<h5>cache_view</h5>
249<p>the cache view.</p>
250
251 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]252<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]253<div class="doc-section">
254
255<p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireCacheView().</p>
256
257<p>The format of the DestroyCacheView method is:</p>
258
259<pre class="code">
260 CacheView *DestroyCacheView(CacheView *cache_view)
261</pre>
262
263<p>A description of each parameter follows:</p>
264
265<h5>cache_view</h5>
266<p>the cache view.</p>
267
268 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]269<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]270<div class="doc-section">
271
272<p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
273
274<p>The format of the GetCacheViewColorspace method is:</p>
275
276<pre class="code">
277 ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
278</pre>
279
280<p>A description of each parameter follows:</p>
281
282<h5>cache_view</h5>
283<p>the cache view.</p>
284
285 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]286<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]287<div class="doc-section">
288
289<p>GetCacheViewException() returns the image exception associated with the specified view.</p>
290
291<p>The format of the GetCacheViewException method is:</p>
292
293<pre class="code">
294 ExceptionInfo GetCacheViewException(const CacheView *cache_view)
295</pre>
296
297<p>A description of each parameter follows:</p>
298
299<h5>cache_view</h5>
300<p>the cache view.</p>
301
302 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]303<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]304<div class="doc-section">
305
306<p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
307
308<p>The format of the GetCacheViewStorageClass method is:</p>
309
310<pre class="code">
311 ClassType GetCacheViewStorageClass(const CacheView *cache_view)
312</pre>
313
314<p>A description of each parameter follows:</p>
315
316<h5>cache_view</h5>
317<p>the cache view.</p>
318
319 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]320<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]321<div class="doc-section">
322
323<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>
324
325<p>The format of the GetCacheViewAuthenticPixels method is:</p>
326
327<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]328 Quantum *GetCacheViewAuthenticPixels(CacheView *cache_view,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]329 const ssize_t x,const ssize_t y,const size_t columns,
330 const size_t rows,ExceptionInfo *exception)
331</pre>
332
333<p>A description of each parameter follows:</p>
334
335<h5>cache_view</h5>
336<p>the cache view.</p>
337
338<h5>x,y,columns,rows</h5>
339<p>These values define the perimeter of a region of pixels.</p>
340
341 </div>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]342<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticMetacontent">GetCacheViewAuthenticMetacontent</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]343<div class="doc-section">
344
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]345<p>GetCacheViewAuthenticMetacontent() returns the meta-content corresponding with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticMetacontent(). The meta-content are authentic and can be updated.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]346
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]347<p>The format of the GetCacheViewAuthenticMetacontent() method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]348
349<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]350 void *GetCacheViewAuthenticMetacontent(CacheView *cache_view)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]351</pre>
352
353<p>A description of each parameter follows:</p>
354
355<h5>cache_view</h5>
356<p>the cache view.</p>
357
358 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]359<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]360<div class="doc-section">
361
362<p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
363
364<p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
365
366<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]367 Quantum *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]368</pre>
369
370<p>A description of each parameter follows:</p>
371
372<h5>cache_view</h5>
373<p>the cache view.</p>
374
375 </div>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]376<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualMetacontent">GetCacheViewVirtualMetacontent</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]377<div class="doc-section">
378
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]379<p>GetCacheViewVirtualMetacontent() returns the meta-content corresponding with the last call to GetCacheViewVirtualMetacontent(). The meta-content is virtual and therefore cannot be updated.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]380
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]381<p>The format of the GetCacheViewVirtualMetacontent() method is:</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]382
383<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]384 const void *GetCacheViewVirtualMetacontent(
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]385 const CacheView *cache_view)
386</pre>
387
388<p>A description of each parameter follows:</p>
389
390<h5>cache_view</h5>
391<p>the cache view.</p>
392
393 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]394<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]395<div class="doc-section">
396
397<p>GetCacheViewVirtualPixelQueue() returns the the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
398
399<p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
400
401<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]402 const Quantum *GetCacheViewVirtualPixelQueue(
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]403 const CacheView *cache_view)
404</pre>
405
406<p>A description of each parameter follows:</p>
407
408<h5>cache_view</h5>
409<p>the cache view.</p>
410
411 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]412<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]413<div class="doc-section">
414
415<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>
416
417<p>The format of the GetCacheViewVirtualPixels method is:</p>
418
419<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]420 const Quantum *GetCacheViewVirtualPixels(
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]421 const CacheView *cache_view,const ssize_t x,const ssize_t y,
422 const size_t columns,const size_t rows,ExceptionInfo *exception)
423</pre>
424
425<p>A description of each parameter follows:</p>
426
427<h5>cache_view</h5>
428<p>the cache view.</p>
429
430<h5>x,y,columns,rows</h5>
431<p>These values define the perimeter of a region of pixels.</p>
432
433<h5>exception</h5>
434<p>return any errors or warnings in this structure.</p>
435
436 </div>
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]437<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
438<div class="doc-section">
439
440<p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
441
442<p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
443
444<pre class="code">
445 MagickBooleaNType GetOneCacheViewAuthenticPixel(
446 const CacheView *cache_view,const ssize_t x,const ssize_t y,
447 PixelPacket *pixel,ExceptionInfo *exception)
448</pre>
449
450<p>A description of each parameter follows:</p>
451
452<h5>cache_view</h5>
453<p>the cache view.</p>
454
455<h5>x,y</h5>
456<p>These values define the offset of the pixel.</p>
457
458<h5>pixel</h5>
459<p>return a pixel at the specified (x,y) location.</p>
460
461<h5>exception</h5>
462<p>return any errors or warnings in this structure.</p>
463
464 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]465<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]466<div class="doc-section">
467
468<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>
469
470<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
471
472<pre class="code">
473 MagickBooleanType GetOneCacheViewVirtualPixel(
474 const CacheView *cache_view,const ssize_t x,const ssize_t y,
475 PixelPacket *pixel,ExceptionInfo *exception)
476</pre>
477
478<p>A description of each parameter follows:</p>
479
480<h5>cache_view</h5>
481<p>the cache view.</p>
482
483<h5>x,y</h5>
484<p>These values define the offset of the pixel.</p>
485
486<h5>pixel</h5>
487<p>return a pixel at the specified (x,y) location.</p>
488
489<h5>exception</h5>
490<p>return any errors or warnings in this structure.</p>
491
492 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]493<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]494<div class="doc-section">
495
496<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>
497
498<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
499
500<pre class="code">
501 MagickBooleanType GetOneCacheViewVirtualMethodPixel(
502 const CacheView *cache_view,
503 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
504 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
505</pre>
506
507<p>A description of each parameter follows:</p>
508
509<h5>cache_view</h5>
510<p>the cache view.</p>
511
512<h5>virtual_pixel_method</h5>
513<p>the virtual pixel method.</p>
514
515<h5>x,y</h5>
516<p>These values define the offset of the pixel.</p>
517
518<h5>pixel</h5>
519<p>return a pixel at the specified (x,y) location.</p>
520
521<h5>exception</h5>
522<p>return any errors or warnings in this structure.</p>
523
524 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]525<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]526<div class="doc-section">
527
528<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>
529
530<p>The format of the QueueCacheViewAuthenticPixels method is:</p>
531
532<pre class="code">
cristya4dfb122011-07-07 19:01:57 +0000[diff] [blame]533 Quantum *QueueCacheViewAuthenticPixels(CacheView *cache_view,
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]534 const ssize_t x,const ssize_t y,const size_t columns,
535 const size_t rows,ExceptionInfo *exception)
536</pre>
537
538<p>A description of each parameter follows:</p>
539
540<h5>cache_view</h5>
541<p>the cache view.</p>
542
543<h5>x,y,columns,rows</h5>
544<p>These values define the perimeter of a region of pixels.</p>
545
546<h5>exception</h5>
547<p>return any errors or warnings in this structure.</p>
548
549 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]550<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]551<div class="doc-section">
552
553<p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
554
555<p>The format of the SetCacheViewStorageClass method is:</p>
556
557<pre class="code">
558 MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
559 const ClassType storage_class)
560</pre>
561
562<p>A description of each parameter follows:</p>
563
564<h5>cache_view</h5>
565<p>the cache view.</p>
566
567<h5>storage_class</h5>
568<p>the image storage class: PseudoClass or DirectClass.</p>
569
570 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]571<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]572<div class="doc-section">
573
574<p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
575
576<p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
577
578<pre class="code">
579 MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
580 const VirtualPixelMethod virtual_pixel_method)
581</pre>
582
583<p>A description of each parameter follows:</p>
584
585<h5>cache_view</h5>
586<p>the cache view.</p>
587
588<h5>virtual_pixel_method</h5>
589<p>the virtual pixel method.</p>
590
591 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]592<h2><a href="http://www.imagemagick.org/api/MagickCore/cache-view_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]593<div class="doc-section">
594
595<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>
596
597<p>The format of the SyncCacheViewAuthenticPixels method is:</p>
598
599<pre class="code">
600 MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
601 ExceptionInfo *exception)
602</pre>
603
604<p>A description of each parameter follows:</p>
605
606<h5>cache_view</h5>
607<p>the cache view.</p>
608
609<h5>exception</h5>
610<p>return any errors or warnings in this structure.</p>
611
612 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]613
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