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gerrit-public.fairphone.software / platform / external / ImageMagick / 178edafa2ddbc40465115383b13685f7bc913b1f / . / www / api / blob.html
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]7 <title>ImageMagick: MagickCore, C API for ImageMagick: Read or Write Binary Large OBjects</title>
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179<div class="main">
180
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module blob
182 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<p class="navigation-index">[<a href="#BlobToImage">BlobToImage</a> &bull; <a href="#FileToImage">FileToImage</a> &bull; <a href="#GetBlobProperties">GetBlobProperties</a> &bull; <a href="#ImageToBlob">ImageToBlob</a> &bull; <a href="#ImageToFile">ImageToFile</a> &bull; <a href="#ImagesToBlob">ImagesToBlob</a> &bull; <a href="#InjectImageBlob">InjectImageBlob</a>]</p>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
186_8c.html" id="BlobToImage">BlobToImage</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>BlobToImage() implements direct to memory image formats. It returns the blob as an image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]190
191<p>The format of the BlobToImage method is:</p>
192
193<pre class="code">
194 Image *BlobToImage(const ImageInfo *image_info,const void *blob,
195 const size_t length,ExceptionInfo *exception)
196</pre>
197
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]198<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199
200<h5>image_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]201<p>the image info.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]202
203<h5>blob</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]204<p>the address of a character stream in one of the image formats understood by ImageMagick.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]205
206<h5>length</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]207<p>This size_t integer reflects the length in bytes of the blob.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
209<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]210<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]211
212 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]213<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
214_8c.html" id="FileToImage">FileToImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]215<div class="doc-section">
216
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]217<p>FileToImage() write the contents of a file to an image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218
219<p>The format of the FileToImage method is:</p>
220
221<pre class="code">
222 MagickBooleanType FileToImage(Image *,const char *filename)
223</pre>
224
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]225<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]226
227<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]228<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]229
230<h5>filename</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]231<p>the filename.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]232
233 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]234<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
235_8c.html" id="GetBlobProperties">GetBlobProperties</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236<div class="doc-section">
237
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]238<p>GetBlobProperties() returns information about an image blob.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]239
240<p>The format of the GetBlobProperties method is:</p>
241
242<pre class="code">
243 const struct stat *GetBlobProperties(const Image *image)
244</pre>
245
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]246<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]247
248<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]249<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]250
251 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]252<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
253_8c.html" id="ImageToBlob">ImageToBlob</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254<div class="doc-section">
255
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]256<p>ImageToBlob() implements direct to memory image formats. It returns the image as a blob and its length. The magick member of the ImageInfo structure determines the format of the returned blob (GIF, JPEG, PNG, etc.)</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]257
258<p>The format of the ImageToBlob method is:</p>
259
260<pre class="code">
261 unsigned char *ImageToBlob(const ImageInfo *image_info,Image *image,
262 size_t *length,ExceptionInfo *exception)
263</pre>
264
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]265<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]266
267<h5>image_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]268<p>the image info.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]269
270<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]271<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]272
273<h5>length</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]274<p>This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]275
276<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]277<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]278
279 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]280<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
281_8c.html" id="ImageToFile">ImageToFile</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]282<div class="doc-section">
283
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]284<p>ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]285
286<p>The format of the ImageToFile method is:</p>
287
288<pre class="code">
289 MagickBooleanType ImageToFile(Image *image,char *filename,
290 ExceptionInfo *exception)
291</pre>
292
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]293<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]294
295<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]296<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]297
298<h5>filename</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]299<p>Write the image to this file.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]300
301<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]302<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]303
304 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]305<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
306_8c.html" id="ImagesToBlob">ImagesToBlob</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]307<div class="doc-section">
308
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]309<p>ImagesToBlob() implements direct to memory image formats. It returns the image sequence as a blob and its length. The magick member of the ImageInfo structure determines the format of the returned blob (GIF, JPEG, PNG, etc.)</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]310
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]311<p>Note, some image formats do not permit multiple images to the same image stream (e.g. JPEG). in this instance, just the first image of the sequence is returned as a blob.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]312
313<p>The format of the ImagesToBlob method is:</p>
314
315<pre class="code">
316 unsigned char *ImagesToBlob(const ImageInfo *image_info,Image *images,
317 size_t *length,ExceptionInfo *exception)
318</pre>
319
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]320<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321
322<h5>image_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]323<p>the image info.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324
325<h5>images</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]326<p>the image list.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]327
328<h5>length</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]329<p>This pointer to a size_t integer sets the initial length of the blob. On return, it reflects the actual length of the blob.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]330
331<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]332<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]333
334 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]335<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/blob
336_8c.html" id="InjectImageBlob">InjectImageBlob</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]337<div class="doc-section">
338
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]339<p>InjectImageBlob() injects the image with a copy of itself in the specified format (e.g. inject JPEG into a PDF image).</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]340
341<p>The format of the InjectImageBlob method is:</p>
342
343<pre class="code">
344 MagickBooleanType InjectImageBlob(const ImageInfo *image_info,
345 Image *image,Image *inject_image,const char *format,
346 ExceptionInfo *exception)
347</pre>
348
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]350
351<h5>image_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]352<p>the image info..</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]353
354<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]355<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]356
357<h5>inject_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]358<p>inject into the image stream.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]359
360<h5>format</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]361<p>the image format.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]362
363<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]364<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]365
366 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]367
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