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gerrit-public.fairphone.software / platform / external / ImageMagick / e6529ff52c05a2d3352d83a429cb69aa15f5b585 / . / www / api / cache-view.html
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178
179<div class="main">
180
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module cache-view
182 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<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="#GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a> &bull; <a href="#GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a> &bull; <a href="#GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a> &bull; <a href="#GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a> &bull; <a href="#GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a> &bull; <a href="#GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</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>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
186_8c.html" id="AcquireCacheView">AcquireCacheView</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187<div class="doc-section">
188
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]189<p>AcquireCacheView() acquires a view into the pixel cache, using the VirtualPixelMethod that is defined within the given image itself.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]190
191<p>The format of the AcquireCacheView method is:</p>
192
193<pre class="code">
194 CacheView *AcquireCacheView(const Image *image)
195</pre>
196
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]197<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198
199<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]200<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]201
202 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]203<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
204_8c.html" id="CloneCacheView">CloneCacheView</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]205<div class="doc-section">
206
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]207<p>CloneCacheView() makes an exact copy of the specified cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
209<p>The format of the CloneCacheView method is:</p>
210
211<pre class="code">
212 CacheView *CloneCacheView(const CacheView *cache_view)
213</pre>
214
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]215<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
217<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]218<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]219
220 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]221<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
222_8c.html" id="DestroyCacheView">DestroyCacheView</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]223<div class="doc-section">
224
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]225<p>DestroyCacheView() destroys the specified view returned by a previous call to AcquireCacheView().</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]226
227<p>The format of the DestroyCacheView method is:</p>
228
229<pre class="code">
230 CacheView *DestroyCacheView(CacheView *cache_view)
231</pre>
232
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]233<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]234
235<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]236<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]237
238 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]239<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
240_8c.html" id="GetCacheViewColorspace">GetCacheViewColorspace</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]241<div class="doc-section">
242
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]243<p>GetCacheViewColorspace() returns the image colorspace associated with the specified view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244
245<p>The format of the GetCacheViewColorspace method is:</p>
246
247<pre class="code">
248 ColorspaceType GetCacheViewColorspace(const CacheView *cache_view)
249</pre>
250
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]251<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]252
253<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]254<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]255
256 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]257<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
258_8c.html" id="GetCacheViewException">GetCacheViewException</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]259<div class="doc-section">
260
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]261<p>GetCacheViewException() returns the image exception associated with the specified view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]262
263<p>The format of the GetCacheViewException method is:</p>
264
265<pre class="code">
266 ExceptionInfo GetCacheViewException(const CacheView *cache_view)
267</pre>
268
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]270
271<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]272<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]273
274 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]275<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
276_8c.html" id="GetCacheViewStorageClass">GetCacheViewStorageClass</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]277<div class="doc-section">
278
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]279<p>GetCacheViewStorageClass() returns the image storage class associated with the specified view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]280
281<p>The format of the GetCacheViewStorageClass method is:</p>
282
283<pre class="code">
284 ClassType GetCacheViewStorageClass(const CacheView *cache_view)
285</pre>
286
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]287<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]288
289<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]290<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]291
292 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]293<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
294_8c.html" id="GetCacheViewAuthenticPixels">GetCacheViewAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]295<div class="doc-section">
296
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]297<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]298
299<p>The format of the GetCacheViewAuthenticPixels method is:</p>
300
301<pre class="code">
302 PixelPacket *GetCacheViewAuthenticPixels(CacheView *cache_view,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]303 const ssize_t x,const ssize_t y,const size_t columns,
304 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]305</pre>
306
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]307<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]308
309<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]310<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]311
312<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]313<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]314
315 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]316<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
317_8c.html" id="GetOneCacheViewAuthenticPixel">GetOneCacheViewAuthenticPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]318<div class="doc-section">
319
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]320<p>GetOneCacheViewAuthenticPixel() returns a single pixel at the specified (x,y) location. The image background color is returned if an error occurs.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321
322<p>The format of the GetOneCacheViewAuthenticPixel method is:</p>
323
324<pre class="code">
325 MagickBooleaNType GetOneCacheViewAuthenticPixel(
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]326 const CacheView *cache_view,const ssize_t x,const ssize_t y,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]327 Pixelpacket *pixel,ExceptionInfo *exception)
328</pre>
329
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]330<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]331
332<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]333<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]334
335<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]336<p>These values define the offset of the pixel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]337
338<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]339<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]340
341<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]342<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]343
344 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]345<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
346_8c.html" id="GetCacheViewAuthenticIndexQueue">GetCacheViewAuthenticIndexQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]347<div class="doc-section">
348
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>GetCacheViewAuthenticIndexQueue() returns the indexes associated with the last call to SetCacheViewIndexes() or GetCacheViewAuthenticIndexQueue(). The indexes are authentic and can be updated.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]350
351<p>The format of the GetCacheViewAuthenticIndexQueue() method is:</p>
352
353<pre class="code">
354 IndexPacket *GetCacheViewAuthenticIndexQueue(CacheView *cache_view)
355</pre>
356
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]357<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]358
359<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]360<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]361
362 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]363<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
364_8c.html" id="GetCacheViewAuthenticPixelQueue">GetCacheViewAuthenticPixelQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]365<div class="doc-section">
366
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]367<p>GetCacheViewAuthenticPixelQueue() returns the pixels associated with the last call to QueueCacheViewAuthenticPixels() or GetCacheViewAuthenticPixels(). The pixels are authentic and therefore can be updated.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]368
369<p>The format of the GetCacheViewAuthenticPixelQueue() method is:</p>
370
371<pre class="code">
372 PixelPacket *GetCacheViewAuthenticPixelQueue(CacheView *cache_view)
373</pre>
374
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]375<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]376
377<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]378<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]379
380 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]381<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
382_8c.html" id="GetCacheViewVirtualIndexQueue">GetCacheViewVirtualIndexQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]383<div class="doc-section">
384
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]385<p>GetCacheViewVirtualIndexQueue() returns the indexes associated with the last call to GetCacheViewVirtualIndexQueue(). The indexes are virtual and therefore cannot be updated.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]386
387<p>The format of the GetCacheViewVirtualIndexQueue() method is:</p>
388
389<pre class="code">
390 const IndexPacket *GetCacheViewVirtualIndexQueue(
391 const CacheView *cache_view)
392</pre>
393
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]394<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]395
396<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]397<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]398
399 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]400<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
401_8c.html" id="GetCacheViewVirtualPixelQueue">GetCacheViewVirtualPixelQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]402<div class="doc-section">
403
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]404<p>GetCacheViewVirtualPixelQueue() returns the the pixels associated with the last call to GetCacheViewVirtualPixels(). The pixels are virtual and therefore cannot be updated.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]405
406<p>The format of the GetCacheViewVirtualPixelQueue() method is:</p>
407
408<pre class="code">
409 const PixelPacket *GetCacheViewVirtualPixelQueue(
410 const CacheView *cache_view)
411</pre>
412
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]413<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]414
415<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]416<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]417
418 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]419<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
420_8c.html" id="GetCacheViewVirtualPixels">GetCacheViewVirtualPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]421<div class="doc-section">
422
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]423<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]424
425<p>The format of the GetCacheViewVirtualPixels method is:</p>
426
427<pre class="code">
428 const PixelPacket *GetCacheViewVirtualPixels(
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]429 const CacheView *cache_view,const ssize_t x,const ssize_t y,
cristybc9539a2010-08-16 18:06:20 +0000[diff] [blame]430 const size_t columns,const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]431</pre>
432
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]433<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]434
435<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]436<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]437
438<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]439<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]440
441<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]442<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]443
444 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]445<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
446_8c.html" id="GetOneCacheViewVirtualPixel">GetOneCacheViewVirtualPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]447<div class="doc-section">
448
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]449<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]450
451<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
452
453<pre class="code">
454 MagickBooleanType GetOneCacheViewVirtualPixel(
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]455 const CacheView *cache_view,const ssize_t x,const ssize_t y,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]456 PixelPacket *pixel,ExceptionInfo *exception)
457</pre>
458
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]459<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]460
461<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]462<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]463
464<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]465<p>These values define the offset of the pixel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]466
467<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]468<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]469
470<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]471<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]472
473 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]474<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
475_8c.html" id="GetOneCacheViewVirtualMethodPixel">GetOneCacheViewVirtualMethodPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]476<div class="doc-section">
477
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]478<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]479
480<p>The format of the GetOneCacheViewVirtualPixel method is:</p>
481
482<pre class="code">
483 MagickBooleanType GetOneCacheViewVirtualMethodPixel(
484 const CacheView *cache_view,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]485 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
486 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]487</pre>
488
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]489<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]490
491<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]492<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]493
494<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]495<p>the virtual pixel method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]496
497<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]498<p>These values define the offset of the pixel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]499
500<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]501<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]502
503<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]504<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]505
506 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]507<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
508_8c.html" id="QueueCacheViewAuthenticPixels">QueueCacheViewAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]509<div class="doc-section">
510
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]511<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]512
513<p>The format of the QueueCacheViewAuthenticPixels method is:</p>
514
515<pre class="code">
516 PixelPacket *QueueCacheViewAuthenticPixels(CacheView *cache_view,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]517 const ssize_t x,const ssize_t y,const size_t columns,
518 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]519</pre>
520
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]521<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]522
523<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]524<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]525
526<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]527<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]528
529<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]530<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]531
532 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]533<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
534_8c.html" id="SetCacheViewStorageClass">SetCacheViewStorageClass</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]535<div class="doc-section">
536
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]537<p>SetCacheViewStorageClass() sets the image storage class associated with the specified view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]538
539<p>The format of the SetCacheViewStorageClass method is:</p>
540
541<pre class="code">
542 MagickBooleanType SetCacheViewStorageClass(CacheView *cache_view,
543 const ClassType storage_class)
544</pre>
545
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]546<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]547
548<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]549<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]550
551<h5>storage_class</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]552<p>the image storage class: PseudoClass or DirectClass.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]553
554 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]555<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
556_8c.html" id="SetCacheViewVirtualPixelMethod">SetCacheViewVirtualPixelMethod</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]557<div class="doc-section">
558
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]559<p>SetCacheViewVirtualPixelMethod() sets the virtual pixel method associated with the specified cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]560
561<p>The format of the SetCacheViewVirtualPixelMethod method is:</p>
562
563<pre class="code">
564 MagickBooleanType SetCacheViewVirtualPixelMethod(CacheView *cache_view,
565 const VirtualPixelMethod virtual_pixel_method)
566</pre>
567
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]568<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]569
570<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]571<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]572
573<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]574<p>the virtual pixel method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]575
576 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]577<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache-view
578_8c.html" id="SyncCacheViewAuthenticPixels">SyncCacheViewAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]579<div class="doc-section">
580
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]581<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]582
583<p>The format of the SyncCacheViewAuthenticPixels method is:</p>
584
585<pre class="code">
586 MagickBooleanType SyncCacheViewAuthenticPixels(CacheView *cache_view,
587 ExceptionInfo *exception)
588</pre>
589
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]590<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]591
592<h5>cache_view</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]593<p>the cache view.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]594
595<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]596<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]597
598 </div>
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