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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]178<h1>Module cache
179 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]180<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>
181
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]182<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
183_8c.html" id="AcquirePixelCacheNexus">AcquirePixelCacheNexus</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]184<div class="doc-section">
185
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]186<p>AcquirePixelCacheNexus() allocates the NexusInfo structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187
188<p>The format of the AcquirePixelCacheNexus method is:</p>
189
190<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]191 NexusInfo **AcquirePixelCacheNexus(const size_t number_threads)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]192</pre>
193
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]194<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]195
196<h5>number_threads</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]197<p>the number of nexus threads.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198
199 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]200<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
201_8c.html" id="GetAuthenticIndexQueue">GetAuthenticIndexQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]202<div class="doc-section">
203
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]204<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]205
206<p>The format of the GetAuthenticIndexQueue() method is:</p>
207
208<pre class="code">
209 IndexPacket *GetAuthenticIndexQueue(const Image *image)
210</pre>
211
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]212<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213
214<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]215<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
217 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]218<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
219_8c.html" id="GetAuthenticPixelQueue">GetAuthenticPixelQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]220<div class="doc-section">
221
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]222<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]223
224<p>The format of the GetAuthenticPixelQueue() method is:</p>
225
226<pre class="code">
227 PixelPacket *GetAuthenticPixelQueue(const Image image)
228</pre>
229
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]230<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]231
232<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]233<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]234
235 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]236<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
237_8c.html" id="GetAuthenticPixels">GetAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238<div class="doc-section">
239
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]240<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]241
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]242<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]243
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]244<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]245
246<p>The format of the GetAuthenticPixels() method is:</p>
247
248<pre class="code">
cristyeaedf062010-05-29 22:36:02 +0000[diff] [blame]249 PixelPacket *GetAuthenticPixels(Image *image,const ssize_t x,
250 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]251 ExceptionInfo *exception)
252</pre>
253
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]254<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]255
256<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]257<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]258
259<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]260<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]261
262<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]263<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]264
265 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]266<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
267_8c.html" id="GetOneAuthenticPixel">GetOneAuthenticPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]268<div class="doc-section">
269
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]270<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]271
272<p>The format of the GetOneAuthenticPixel() method is:</p>
273
274<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]275 MagickBooleanType GetOneAuthenticPixel(const Image image,const ssize_t x,
276 const ssize_t y,PixelPacket *pixel,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]277</pre>
278
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]279<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]280
281<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]282<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]283
284<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]285<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]286
287<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]288<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]289
290<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]291<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]292
293 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]294<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
295_8c.html" id="GetOneVirtualMagickPixel">GetOneVirtualMagickPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]296<div class="doc-section">
297
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]298<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]299
300<p>The format of the GetOneVirtualMagickPixel() method is:</p>
301
302<pre class="code">
303 MagickBooleanType GetOneVirtualMagickPixel(const Image image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]304 const ssize_t x,const ssize_t y,MagickPixelPacket *pixel,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]305 ExceptionInfo exception)
306</pre>
307
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]308<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]309
310<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]311<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]312
313<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]314<p>these values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]315
316<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]317<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]318
319<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]320<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321
322 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]323<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
324_8c.html" id="GetOneVirtualMethodPixel">GetOneVirtualMethodPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]325<div class="doc-section">
326
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]327<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]328
329<p>The format of the GetOneVirtualMethodPixel() method is:</p>
330
331<pre class="code">
332 MagickBooleanType GetOneVirtualMethodPixel(const Image image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]333 const VirtualPixelMethod virtual_pixel_method,const ssize_t x,
334 const ssize_t y,Pixelpacket *pixel,ExceptionInfo exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]335</pre>
336
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]337<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]338
339<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]340<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]341
342<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]343<p>the virtual pixel method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]344
345<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]346<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]347
348<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]350
351<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]352<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]353
354 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]355<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
356_8c.html" id="GetOneVirtualPixel">GetOneVirtualPixel</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]357<div class="doc-section">
358
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]359<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]360
361<p>The format of the GetOneVirtualPixel() method is:</p>
362
363<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]364 MagickBooleanType GetOneVirtualPixel(const Image image,const ssize_t x,
365 const ssize_t y,PixelPacket *pixel,ExceptionInfo exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]366</pre>
367
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]368<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]369
370<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]371<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]372
373<h5>x,y</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]374<p>These values define the location of the pixel to return.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]375
376<h5>pixel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]377<p>return a pixel at the specified (x,y) location.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]378
379<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]380<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]381
382 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]383<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
384_8c.html" id="GetVirtualIndexQueue">GetVirtualIndexQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]385<div class="doc-section">
386
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]387<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]388
389<p>The format of the GetVirtualIndexQueue() method is:</p>
390
391<pre class="code">
392 const IndexPacket *GetVirtualIndexQueue(const Image *image)
393</pre>
394
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]395<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]396
397<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]398<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]399
400 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]401<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
402_8c.html" id="VirtualPixelModulo">VirtualPixelModulo</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]403<div class="doc-section">
404
405<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>
406 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]407<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
408_8c.html" id="GetVirtualPixelQueue">GetVirtualPixelQueue</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]409<div class="doc-section">
410
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]411<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]412
413<p>The format of the GetVirtualPixelQueue() method is:</p>
414
415<pre class="code">
416 const PixelPacket *GetVirtualPixelQueue(const Image image)
417</pre>
418
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]419<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]420
421<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]422<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]423
424 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]425<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
426_8c.html" id="GetVirtualPixels">GetVirtualPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]427<div class="doc-section">
428
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]429<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]430
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]431<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]432
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]433<p>If you plan to modify the pixels, use GetAuthenticPixels() instead.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]434
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]435<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]436
437<p>The format of the GetVirtualPixels() method is:</p>
438
439<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]440 const PixelPacket *GetVirtualPixels(const Image *image,const ssize_t x,
441 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]442 ExceptionInfo *exception)
443</pre>
444
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]445<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]446
447<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]448<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]449
450<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]451<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]452
453<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]454<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]455
456 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]457<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
458_8c.html" id="QueueAuthenticPixels">QueueAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]459<div class="doc-section">
460
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]461<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]462
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]463<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]464
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]465<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]466
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]467<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]468
469<p>The format of the QueueAuthenticPixels() method is:</p>
470
471<pre class="code">
cristyeaedf062010-05-29 22:36:02 +0000[diff] [blame]472 PixelPacket *QueueAuthenticPixels(Image *image,const ssize_t x,
473 const ssize_t y,const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]474 ExceptionInfo *exception)
475</pre>
476
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]477<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]478
479<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]480<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]481
482<h5>x,y,columns,rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]483<p>These values define the perimeter of a region of pixels.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]484
485<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]486<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]487
488 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]489<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
490_8c.html" id="SetPixelCacheVirtualMethod">SetPixelCacheVirtualMethod</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]491<div class="doc-section">
492
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]493<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]494
495<p>The format of the SetPixelCacheVirtualMethod() method is:</p>
496
497<pre class="code">
498 VirtualPixelMethod SetPixelCacheVirtualMethod(const Image *image,
499 const VirtualPixelMethod virtual_pixel_method)
500</pre>
501
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]502<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]503
504<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]505<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]506
507<h5>virtual_pixel_method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]508<p>choose the type of virtual pixel.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]509
510 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]511<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/cache
512_8c.html" id="SyncAuthenticPixels">SyncAuthenticPixels</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]513<div class="doc-section">
514
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]515<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]516
517<p>The format of the SyncAuthenticPixels() method is:</p>
518
519<pre class="code">
520 MagickBooleanType SyncAuthenticPixels(Image *image,
521 ExceptionInfo *exception)
522</pre>
523
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]524<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]525
526<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]527<p>the image.</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>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]533
534</div>
535
536<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]537 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]538 <span id="linkbar-center">
539 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]540 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]541 </span>
542 <span id="linkbar-east">&nbsp;</span>
543 </div>
544 <div class="footer">
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]545 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]546 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
547 </div>
548 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]549 <script type="text/javascript">
550 var _gaq = _gaq || [];
551 _gaq.push(['_setAccount', 'UA-17690367-1']);
552 _gaq.push(['_trackPageview']);
553
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555 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
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557 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
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559 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]560</body>
561</html>