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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module cache
182 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<p class="navigation-index">[<a href="#AcquirePixelCacheNexus">AcquirePixelCacheNexus</a> &bull; <a href="#GetAuthenticIndexQueue">GetAuthenticIndexQueue</a> &bull; <a href="#GetAuthenticPixelQueue">GetAuthenticPixelQueue</a> &bull; <a href="#GetAuthenticPixels">GetAuthenticPixels</a> &bull; <a href="#GetOneAuthenticPixel">GetOneAuthenticPixel</a> &bull; <a href="#GetOneVirtualMagickPixel">GetOneVirtualMagickPixel</a> &bull; <a href="#GetOneVirtualMethodPixel">GetOneVirtualMethodPixel</a> &bull; <a href="#GetOneVirtualPixel">GetOneVirtualPixel</a> &bull; <a href="#GetVirtualIndexQueue">GetVirtualIndexQueue</a> &bull; <a href="#VirtualPixelModulo">VirtualPixelModulo</a> &bull; <a href="#GetVirtualPixelQueue">GetVirtualPixelQueue</a> &bull; <a href="#GetVirtualPixels">GetVirtualPixels</a> &bull; <a href="#QueueAuthenticPixels">QueueAuthenticPixels</a> &bull; <a href="#SetPixelCacheVirtualMethod">SetPixelCacheVirtualMethod</a> &bull; <a href="#SyncAuthenticPixels">SyncAuthenticPixels</a>]</p>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
186_8c.html" id="AcquirePixelCacheNexus">AcquirePixelCacheNexus</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>AcquirePixelCacheNexus() allocates the NexusInfo structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]190
191<p>The format of the AcquirePixelCacheNexus method is:</p>
192
193<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]194 NexusInfo **AcquirePixelCacheNexus(const size_t number_threads)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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>number_threads</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]200<p>the number of nexus threads.</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
204_8c.html" id="GetAuthenticIndexQueue">GetAuthenticIndexQueue</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>GetAuthenticIndexQueue() returns the authentic black channel or the colormap indexes associated with the last call to QueueAuthenticPixels() or GetVirtualPixels(). NULL is returned if the black channel or colormap indexes are not available.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
209<p>The format of the GetAuthenticIndexQueue() method is:</p>
210
211<pre class="code">
212 IndexPacket *GetAuthenticIndexQueue(const Image *image)
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>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]218<p>the image.</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
222_8c.html" id="GetAuthenticPixelQueue">GetAuthenticPixelQueue</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>GetAuthenticPixelQueue() returns the authentic pixels associated with the last call to QueueAuthenticPixels() or GetAuthenticPixels().</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]226
227<p>The format of the GetAuthenticPixelQueue() method is:</p>
228
229<pre class="code">
230 PixelPacket *GetAuthenticPixelQueue(const Image image)
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>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]236<p>the image.</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
240_8c.html" id="GetAuthenticPixels">GetAuthenticPixels</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>GetAuthenticPixels() obtains a pixel region for read/write access. If the region is successfully accessed, a pointer to a PixelPacket array representing the region is returned, otherwise NULL is returned.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]245<p>The returned pointer may point to a temporary working copy of the pixels or it may point to the original pixels in memory. Performance is maximized if the selected region is part of one row, or one or more full rows, since then there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]246
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]247<p>Pixels accessed via the returned pointer represent a simple array of type PixelPacket. If the image type is CMYK or if the storage class is PseduoClass, call GetAuthenticIndexQueue() after invoking GetAuthenticPixels() to obtain the black color component or colormap indexes (of type IndexPacket) corresponding to the region. Once the PixelPacket (and/or IndexPacket) array has been updated, the changes must be saved back to the underlying image using SyncAuthenticPixels() or they may be lost.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]248
249<p>The format of the GetAuthenticPixels() method is:</p>
250
251<pre class="code">
cristyeaedf062010-05-29 22:36:02 +0000[diff] [blame]252 PixelPacket *GetAuthenticPixels(Image *image,const ssize_t x,
253 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254 ExceptionInfo *exception)
255</pre>
256
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]257<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]258
259<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]260<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]261
262<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]263<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]264
265<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]266<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]267
268 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
270_8c.html" id="GetOneAuthenticPixel">GetOneAuthenticPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]271<div class="doc-section">
272
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]273<p>GetOneAuthenticPixel() 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]274
275<p>The format of the GetOneAuthenticPixel() method is:</p>
276
277<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]278 MagickBooleanType GetOneAuthenticPixel(const Image image,const ssize_t x,
279 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]280</pre>
281
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]282<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]283
284<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]285<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]286
287<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]288<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]289
290<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]291<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]292
293<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]294<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]295
296 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]297<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
298_8c.html" id="GetOneVirtualMagickPixel">GetOneVirtualMagickPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]299<div class="doc-section">
300
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]301<p>GetOneVirtualMagickPixel() 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 GetOneAuthenticPixel() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]302
303<p>The format of the GetOneVirtualMagickPixel() method is:</p>
304
305<pre class="code">
306 MagickBooleanType GetOneVirtualMagickPixel(const Image image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]307 const ssize_t x,const ssize_t y,MagickPixelPacket *pixel,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]308 ExceptionInfo exception)
309</pre>
310
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]311<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]312
313<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]314<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]315
316<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]317<p>these values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]318
319<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]320<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321
322<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]323<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324
325 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]326<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
327_8c.html" id="GetOneVirtualMethodPixel">GetOneVirtualMethodPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]328<div class="doc-section">
329
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]330<p>GetOneVirtualMethodPixel() returns a single pixel at the specified (x,y) location as defined by specified pixel method. The image background color is returned if an error occurs. If you plan to modify the pixel, use GetOneAuthenticPixel() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]331
332<p>The format of the GetOneVirtualMethodPixel() method is:</p>
333
334<pre class="code">
335 MagickBooleanType GetOneVirtualMethodPixel(const Image image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]336 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
337 const ssize_t y,Pixelpacket *pixel,ExceptionInfo exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]338</pre>
339
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]340<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]341
342<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]343<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]344
345<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]346<p>the virtual pixel method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]347
348<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]350
351<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]352<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]353
354<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]355<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]356
357 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]358<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
359_8c.html" id="GetOneVirtualPixel">GetOneVirtualPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]360<div class="doc-section">
361
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]362<p>GetOneVirtualPixel() 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 GetOneAuthenticPixel() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]363
364<p>The format of the GetOneVirtualPixel() method is:</p>
365
366<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]367 MagickBooleanType GetOneVirtualPixel(const Image image,const ssize_t x,
368 const ssize_t y,PixelPacket *pixel,ExceptionInfo exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]369</pre>
370
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]371<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]372
373<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]374<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]375
376<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]377<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]378
379<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]380<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]381
382<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]383<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]384
385 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]386<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
387_8c.html" id="GetVirtualIndexQueue">GetVirtualIndexQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]388<div class="doc-section">
389
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]390<p>GetVirtualIndexQueue() returns the virtual black channel or the colormap indexes associated with the last call to QueueAuthenticPixels() or GetVirtualPixels(). NULL is returned if the black channel or colormap indexes are not available.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]391
392<p>The format of the GetVirtualIndexQueue() method is:</p>
393
394<pre class="code">
395 const IndexPacket *GetVirtualIndexQueue(const Image *image)
396</pre>
397
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]398<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]399
400<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]401<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]402
403 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]404<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
405_8c.html" id="VirtualPixelModulo">VirtualPixelModulo</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]406<div class="doc-section">
407
408<p>VirtualPixelModulo() computes the remainder of dividing offset by extent. It returns not only the quotient (tile the offset falls in) but also the positive remainer within that tile such that 0 <= remainder < extent. This method is essentially a ldiv() using a floored modulo division rather than the normal default truncated modulo division. </p>
409 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]410<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
411_8c.html" id="GetVirtualPixelQueue">GetVirtualPixelQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]412<div class="doc-section">
413
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]414<p>GetVirtualPixelQueue() returns the virtual pixels associated with the last call to QueueAuthenticPixels() or GetVirtualPixels().</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]415
416<p>The format of the GetVirtualPixelQueue() method is:</p>
417
418<pre class="code">
419 const PixelPacket *GetVirtualPixelQueue(const Image image)
420</pre>
421
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]422<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]423
424<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]425<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]426
427 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]428<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
429_8c.html" id="GetVirtualPixels">GetVirtualPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]430<div class="doc-section">
431
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]432<p>GetVirtualPixels() returns an immutable pixel region. If the region is successfully accessed, a pointer to it is returned, otherwise NULL is returned. The returned pointer may point to a temporary working copy of the pixels or it may point to the original pixels in memory. Performance is maximized if the selected region is part of one row, or one or more full rows, since there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]433
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]434<p>Pixels accessed via the returned pointer represent a simple array of type PixelPacket. If the image type is CMYK or the storage class is PseudoClass, call GetAuthenticIndexQueue() after invoking GetAuthenticPixels() to access the black color component or to obtain the colormap indexes (of type IndexPacket) corresponding to the region.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]435
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]436<p>If you plan to modify the pixels, use GetAuthenticPixels() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]437
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]438<p>Note, the GetVirtualPixels() and GetAuthenticPixels() methods are not thread- safe. In a threaded environment, use GetCacheViewVirtualPixels() or GetCacheViewAuthenticPixels() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]439
440<p>The format of the GetVirtualPixels() method is:</p>
441
442<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]443 const PixelPacket *GetVirtualPixels(const Image *image,const ssize_t x,
444 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]445 ExceptionInfo *exception)
446</pre>
447
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]448<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]449
450<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]451<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]452
453<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]454<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]455
456<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]457<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]458
459 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]460<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
461_8c.html" id="QueueAuthenticPixels">QueueAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]462<div class="doc-section">
463
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]464<p>QueueAuthenticPixels() queues a mutable pixel region. If the region is successfully intialized a pointer to a PixelPacket array representing the region is returned, otherwise NULL is returned. The returned pointer may point to a temporary working buffer for the pixels or it may point to the final location of the pixels in memory.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]465
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]466<p>Write-only access means that any existing pixel values corresponding to the region are ignored. This is useful if the initial image is being created from scratch, or if the existing pixel values are to be completely replaced without need to refer to their pre-existing values. The application is free to read and write the pixel buffer returned by QueueAuthenticPixels() any way it pleases. QueueAuthenticPixels() does not initialize the pixel array values. Initializing pixel array values is the application's responsibility.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]467
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]468<p>Performance is maximized if the selected region is part of one row, or one or more full rows, since then there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]469
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]470<p>Pixels accessed via the returned pointer represent a simple array of type PixelPacket. If the image type is CMYK or the storage class is PseudoClass, call GetAuthenticIndexQueue() after invoking GetAuthenticPixels() to obtain the black color component or the colormap indexes (of type IndexPacket) corresponding to the region. Once the PixelPacket (and/or IndexPacket) array has been updated, the changes must be saved back to the underlying image using SyncAuthenticPixels() or they may be lost.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]471
472<p>The format of the QueueAuthenticPixels() method is:</p>
473
474<pre class="code">
cristyeaedf062010-05-29 22:36:02 +0000[diff] [blame]475 PixelPacket *QueueAuthenticPixels(Image *image,const ssize_t x,
476 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]477 ExceptionInfo *exception)
478</pre>
479
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]480<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]481
482<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]483<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]484
485<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]486<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]487
488<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]489<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]490
491 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]492<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
493_8c.html" id="SetPixelCacheVirtualMethod">SetPixelCacheVirtualMethod</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]494<div class="doc-section">
495
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]496<p>SetPixelCacheVirtualMethod() sets the "virtual pixels" method for the pixel cache and returns the previous setting. A virtual pixel is any pixel access that is outside the boundaries of the image cache.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]497
498<p>The format of the SetPixelCacheVirtualMethod() method is:</p>
499
500<pre class="code">
501 VirtualPixelMethod SetPixelCacheVirtualMethod(const Image *image,
502 const VirtualPixelMethod virtual_pixel_method)
503</pre>
504
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]505<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]506
507<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]508<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]509
510<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]511<p>choose the type of virtual pixel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]512
513 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]514<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
515_8c.html" id="SyncAuthenticPixels">SyncAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]516<div class="doc-section">
517
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]518<p>SyncAuthenticPixels() saves the image pixels to the in-memory or disk cache. The method returns MagickTrue if the pixel region is flushed, otherwise MagickFalse.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]519
520<p>The format of the SyncAuthenticPixels() method is:</p>
521
522<pre class="code">
523 MagickBooleanType SyncAuthenticPixels(Image *image,
524 ExceptionInfo *exception)
525</pre>
526
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]527<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]528
529<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]530<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]531
532<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]533<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]534
535 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]536
537</div>
538
539<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]540 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]541 <span id="linkbar-center">
542 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]543 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]544 </span>
545 <span id="linkbar-east">&nbsp;</span>
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