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gerrit-public.fairphone.software / platform / external / ImageMagick / e6e8415823c09ed129e481e0a3bc678324b38c99 / . / www / api / blob.html
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cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]3<html version="-//W3C//DTD XHTML 1.1//EN"
4 xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Read or Write Binary Large OBjects</title>
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49
50<body id="www-imagemagick-org">
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205
206<div class="main">
207
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]208<h1>Module blob Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]209<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="BlobToImage">BlobToImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]212<div class="doc-section">
213
214<p>BlobToImage() implements direct to memory image formats. It returns the blob as an image.</p>
215
216<p>The format of the BlobToImage method is:</p>
217
218<pre class="code">
219 Image *BlobToImage(const ImageInfo *image_info,const void *blob,
220 const size_t length,ExceptionInfo *exception)
221</pre>
222
223<p>A description of each parameter follows:</p>
224
225<h5>image_info</h5>
226<p>the image info.</p>
227
228<h5>blob</h5>
229<p>the address of a character stream in one of the image formats understood by ImageMagick.</p>
230
231<h5>length</h5>
232<p>This size_t integer reflects the length in bytes of the blob.</p>
233
234<h5>exception</h5>
235<p>return any errors or warnings in this structure.</p>
236
237 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]238<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="FileToImage">FileToImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]239<div class="doc-section">
240
241<p>FileToImage() write the contents of a file to an image.</p>
242
243<p>The format of the FileToImage method is:</p>
244
245<pre class="code">
246 MagickBooleanType FileToImage(Image *,const char *filename)
247</pre>
248
249<p>A description of each parameter follows:</p>
250
251<h5>image</h5>
252<p>the image.</p>
253
254<h5>filename</h5>
255<p>the filename.</p>
256
257 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]258<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="GetBlobProperties">GetBlobProperties</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]259<div class="doc-section">
260
261<p>GetBlobProperties() returns information about an image blob.</p>
262
263<p>The format of the GetBlobProperties method is:</p>
264
265<pre class="code">
266 const struct stat *GetBlobProperties(const Image *image)
267</pre>
268
269<p>A description of each parameter follows:</p>
270
271<h5>image</h5>
272<p>the image.</p>
273
274 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]275<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImageToBlob">ImageToBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]276<div class="doc-section">
277
cristyda16f162011-02-19 23:52:17 +0000[diff] [blame]278<p>ImageToBlob() implements direct to memory image formats. It returns the image as a formatted blob and its length. The magick member of the Image structure determines the format of the returned blob (GIF, JPEG, PNG, etc.). This method is the equivalent of WriteImage(), but writes the formatted "file" to a memory buffer rather than to an actual file.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]279
280<p>The format of the ImageToBlob method is:</p>
281
282<pre class="code">
283 unsigned char *ImageToBlob(const ImageInfo *image_info,Image *image,
284 size_t *length,ExceptionInfo *exception)
285</pre>
286
287<p>A description of each parameter follows:</p>
288
289<h5>image_info</h5>
290<p>the image info.</p>
291
292<h5>image</h5>
293<p>the image.</p>
294
295<h5>length</h5>
296<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>
297
298<h5>exception</h5>
299<p>return any errors or warnings in this structure.</p>
300
301 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]302<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImageToFile">ImageToFile</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]303<div class="doc-section">
304
305<p>ImageToFile() writes an image to a file. It returns MagickFalse if an error occurs otherwise MagickTrue.</p>
306
307<p>The format of the ImageToFile method is:</p>
308
309<pre class="code">
310 MagickBooleanType ImageToFile(Image *image,char *filename,
311 ExceptionInfo *exception)
312</pre>
313
314<p>A description of each parameter follows:</p>
315
316<h5>image</h5>
317<p>the image.</p>
318
319<h5>filename</h5>
320<p>Write the image to this file.</p>
321
322<h5>exception</h5>
323<p>return any errors or warnings in this structure.</p>
324
325 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]326<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="ImagesToBlob">ImagesToBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]327<div class="doc-section">
328
329<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>
330
331<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>
332
333<p>The format of the ImagesToBlob method is:</p>
334
335<pre class="code">
336 unsigned char *ImagesToBlob(const ImageInfo *image_info,Image *images,
337 size_t *length,ExceptionInfo *exception)
338</pre>
339
340<p>A description of each parameter follows:</p>
341
342<h5>image_info</h5>
343<p>the image info.</p>
344
345<h5>images</h5>
346<p>the image list.</p>
347
348<h5>length</h5>
349<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>
350
351<h5>exception</h5>
352<p>return any errors or warnings in this structure.</p>
353
354 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]355<h2><a href="http://www.imagemagick.org/api/MagickCore/blob_8c.html" id="InjectImageBlob">InjectImageBlob</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]356<div class="doc-section">
357
358<p>InjectImageBlob() injects the image with a copy of itself in the specified format (e.g. inject JPEG into a PDF image).</p>
359
360<p>The format of the InjectImageBlob method is:</p>
361
362<pre class="code">
363 MagickBooleanType InjectImageBlob(const ImageInfo *image_info,
364 Image *image,Image *inject_image,const char *format,
365 ExceptionInfo *exception)
366</pre>
367
368<p>A description of each parameter follows:</p>
369
370<h5>image_info</h5>
371<p>the image info..</p>
372
373<h5>image</h5>
374<p>the image.</p>
375
376<h5>inject_image</h5>
377<p>inject into the image stream.</p>
378
379<h5>format</h5>
380<p>the image format.</p>
381
382<h5>exception</h5>
383<p>return any errors or warnings in this structure.</p>
384
385 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]386
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