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215
216<div class="main">
217
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]218<h1>ImageMagick Version 7 Porting Guide</h1>
219
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]220<p class="navigation-index">[<a href="#headers">Header Files</a> &bull; <a href="#channels">Pixel Channels</a> &bull; <a href="#alpha">Alpha</a> &bull; <a href="#depecate">Deprecated Features Removed</a> &bull; <a href="#summary">Version 7 Change Summary</a> ]</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]221
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]222<p>The design of ImageMagick is an evolutionary process, with the design and implementation efforts serving to influence and guide further progress in the other. With ImageMagick version 7 we aim to improve the design based on lessons learned from the version 6 implementation. ImageMagick was originally designed to display RGB images to an X Windows server. Over time we extended support to RGBA images and then to the CMYK and CMYKA image format. With ImageMagick version 7, we extend support to arbitrary colorspaces with an arbitrary number of pixel channels. Other design changes are in the works and we will document them here so be sure to revisit periodically.</p>
223
224<p>To support variable pixel channels in the MagickCore API, pixel handling has changed and now requires accessors to get or set the pixel components. There are some modest changes to the MagickWand API. Magick++ and PerlMagick should behave exactly as it does for ImageMagick version 6.</p>
225
226<p>We intend to make ImageMagick version 7 available as an Alpha release by the end-of-year 2011. Look for a Beta release sometime in 2012. An official ImageMagick version 7 release will depend on how smoothly the Beta cycle progresses. During the Beta cycle, version 6 developers can attempt to port their software to version 7.<p>
227
228<p>During the ImageMagick version 7 development cycle and release, we will continue to support and enhance version 6 for a minimum of 10 years.</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]229<h2><a id="headers"></a>Header Files</h2>
230<div class="doc-section">
231<p>Prior versions of ImageMagick (4-6) references the ImageMagick header files as <kbd>magick/</kbd> and <kbd>wand/</kbd>. ImageMagick 7 instead uses <kbd>MagickCore/</kbd> and <kbd>MagickWand/</kbd> respectively. For example,</p>
232<pre class="code">
233#include &lt;MagickCore/MagickCore.h>
234#include &lt;MagickWand/MagickWand.h>
235</pre>
236</div>
237
238<h2><a id="channels"></a>Pixel Channels</h2>
239<div class="doc-section">
240<p>Prior versions of ImageMagick (4-6), supports 4 to 5 pixel channels (RGBA or CMYKA). The first 4 channels are accessed with the PixelPacket data structure. The structure includes 4 members of type Quantum (typically 16-bits) of red, green, blue, and opacity. The black channel or colormap indexes are supported by a separate method and structure, IndexPacket. As an example, here is a code snippet from ImageMagick version 6 that negates image pixels:</p>
241
242<pre class="code">
243 for (y=0; y &lt; (ssize_t) image->rows; y++)
244 {
245 register IndexPacket
246 *indexes;
247
248 register PixelPacket
249 *q;
250
251 q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
252 if (q == (PixelPacket *) NULL)
253 {
254 status=MagickFalse;
255 continue;
256 }
257 indexes=GetCacheViewAuthenticIndexQueue(image_view);
258 for (x=0; x &lt; (ssize_t) image->columns; x++)
259 {
260 if ((channels & RedChannel) != 0)
261 q->red=(Quantum) QuantumRange-q->red;
262 if ((channels & GreenChannel) != 0)
263 q->green=(Quantum) QuantumRange-q->green;
264 if ((channels & BlueChannel) != 0)
265 q->blue=(Quantum) QuantumRange-q->blue;
266 if ((channels & OpacityChannel) != 0)
267 q->opacity=(Quantum) QuantumRange-q->opacity;
268 if (((channels & IndexChannel) != 0) &&
269 (image->colorspace == CMYKColorspace))
270 indexes[x]=(IndexPacket) QuantumRange-indexes[x];
271 q++;
272 }
273 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
274 status=MagickFalse;
275 }
276</pre>
277
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]278<p>ImageMagick version 7 supports any number of channels from 1 to 100 (and beyond) and simplifies access with a single method that returns an array of pixel channels of type Quantum. Source code that compiles against prior versions of ImageMagick will require refactoring to work with ImageMagick version 7. We illustrate with an example. Let's naively refactor the version 6 code snippet from above so it works with the ImageMagick version 7 API:</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]279
280<pre class="code">
281 for (y=0; y &lt; (ssize_t) image->rows; y++)
282 {
283 register Quantum
284 *q;
285
286 q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
287 if (q == (Quantum *) NULL)
288 {
289 status=MagickFalse;
290 continue;
291 }
292 for (x=0; x &lt; (ssize_t) image->columns; x++)
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]293 {
294 if ((channels & RedChannel) != 0)
295 SetPixelRed(image,QuantumRange-GetPixelRed(image,q),q);
296 if ((channels & GreenChannel) != 0)
297 SetPixelGreen(image,QuantumRange-GetPixelGreen(image,q),q);
298 if ((channels & BlueChannel) != 0)
299 SetPixelBlue(image,QuantumRange-GetPixelBlue(image,q),q);
300 if (((channels & IndexChannel) != 0) &&
301 (image->colorspace == CMYKColorspace))
302 SetPixelBlack(image,QuantumRange-GetPixelBlack(image,q),q);
303 if ((channels & OpacityChannel) != 0)
304 SetPixelAlpha(image,QuantumRange-GetPixelAlpha(image,q),q);
305 q+=GetImagePixelChannels(image);
306 }
307 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
308 status=MagickFalse;
309 }
310</pre>
311
312<p>Let's do that again but take full advantage of the new variable pixel channel support:</p>
313<pre class="code">
314 for (y=0; y &lt; (ssize_t) image->rows; y++)
315 {
316 register Quantum
317 *q;
318
319 q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
320 if (q == (Quantum *) NULL)
321 {
322 status=MagickFalse;
323 continue;
324 }
325 for (x=0; x &lt; (ssize_t) image->columns; x++)
326 for (channel=0; channel &lt; GetImagePixelChannels(image); channel++)
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]327 {
328 if ((channels & (1 &lt;&lt; channel)) != 0)
329 *q=(Quantum) QuantumRange-(*q);
330 q++;
331 }
332 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
333 status=MagickFalse;
334 }
335</pre>
336
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]337<p>Use GetImagePixelChannels() to advance to the next set of pixel channels.</p>
cristye6e84152011-06-06 14:16:49 +0000[diff] [blame]338
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]339<h4></a>Pixel Accessors</h4>
340<p>Use accessors to get or set pixel components (e.g. GetPixelRed(), SetPixelRed()). You can find these accessors defined in the header file, <kbd>MagickCore/pixel-accessor.h</kbd></p>
cristy2dcd6822011-06-13 16:21:20 +0000[diff] [blame]341
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]342<li>The colormap indexes and black pixel component (for the CMYK colorspace) are no longer stored in the index channel, previously accessed with GetAuthenticIndexQueue() and GetCacheViewAuthenticIndexQueue((). Instead they are now a pixel channel and accessed with the convenience pixel macros GetPixelIndex(), SetPixelIndex(), GetPixelBlack(), and SetPixelBlack().</li>
cristy2dcd6822011-06-13 16:21:20 +0000[diff] [blame]343
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]344<p>In addition to supporting any number of channels, version 7 simplifies working with channels and provides opportunity for compiler optimiziations that were previously not possible. Our benchmarking shows version 7 has increased performance for virtually all image operations.</p>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]345
346<h4></a>Associated Pixel Channels</h4>
347<p>In version 7, we introduce <em>associated</em> pixel channels. These pixel channels are for your exclusive use and are accessed with these MagickCore API methods:</p>
348<dl>
349<li>SetImageAssociatedPixelChannels()</li>
350<li>GetImageAssociatedPixelChannels()</li>
351<li>GetVirtualAssociatedPixels</li>
352<li>GetAuthenticAssociatedPixels</li>
353<li>GetCacheViewAuthenticAssociatedPixels</li>
354<li>GetCacheViewVirtualAssociatedPixels</li>
355</dl>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]356</div>
357
358<h2><a id="alpha"></a>Alpha</h2>
359<div class="doc-section">
cristy2dcd6822011-06-13 16:21:20 +0000[diff] [blame]360<p>We support alpha now, previously opacity. With alpha, a value of 0 means that the pixel does not have any coverage information and is transparent; i.e. there was no color contribution from any geometry because the geometry did not overlap this pixel. A value of QuantumRange means that the pixel is opaque because the geometry completely overlapped the pixel. As a consequence, in version 7, the PixelPacket structure member alpha has replaced the previous opacity member.</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]361</div>
362
363<h2><a id="deprecate"></a>Deprecated Features Removed</h2>
364<div class="doc-section">
cristye6e84152011-06-06 14:16:49 +0000[diff] [blame]365<p>All deprecated features from ImageMagick version 6 are removed in version 7. These include the <kbd>Magick-config</kbd> and <kbd>Wand-config</kbd> configuration utilities. Instead use:</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]366
367<pre class="code">
368 MagickCore-config
369 MagickWand-config
370</pre>
371
372<p>In addition, all deprecated <a href="http://magick.imagemagick.org/api/deprecate.html">MagickCore</a> and <a href="http://magick.imagemagick.org/api/magick-deprecate.html">MagickWand</a> methods are no longer available in version 7.</p>
373</div>
374<h2><a id="summary"></a>Version 7 Change Summary</h2>
375<div class="doc-section">
cristye6e84152011-06-06 14:16:49 +0000[diff] [blame]376<p>Changes from ImageMagick version 6 to version 7 are summarized here:</p>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]377<h5>Pixels</h5>
378<dl>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]379<li>Pixels are no longer addressed with PixelPacket structure members (e.g. red, green, blue, opacity) but as an array of channels (e.g. p[PixelRed]).</li>
380<li>Use convenience macros to access pixel components (e.g. GetPixelRed(), SetPixelRed()).</li>
381<li>The black channel for the CMYK colorspace is no longer stored in the index channel, previously accessed with GetAuthenticIndexQueue() and GetCacheViewAuthenticIndexQueue((). Instead its now a pixel channel and accessed with the convenience pixel macros GetPixelBlack() and SetPixelBlack().</li>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]382<li>Use the index channel to address colormapped indexes. It no longer hosts the black channel for CMYK and CMYKA images.</li>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]383<li>Use GetImagePixelChannels() to advance to the next set of pixel channels.</li>
384<li>Use <em>associated</em> pixel channels for your own use.</li>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]385</dl>
386<h5>Alpha</h5>
387<dl>
388<li>We support alpha rather than opacity (0 transparent; QuantumRange opaque).</li>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]389<li>Use GetPixelAlpha() or SetPixelAlpha() to get or set the alpha pixel component value.</li>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]390</dl>
391<h5>Deprecated Methods</h5>
392<dl>
cristy2dcd6822011-06-13 16:21:20 +0000[diff] [blame]393<li>All ImageMagick version 6 MagickCore and MagickWand deprecated methods are removed and no longer available in ImageMagick version 7.</li>
cristyba1758d2011-06-03 01:29:12 +0000[diff] [blame]394</dl>
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