This file is indexed.

/usr/share/gtk-doc/html/cairo/cairo-Image-Surfaces.html is in libcairo2-doc 1.14.6-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Cairo: A Vector Graphics Library: Image Surfaces</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="index.html" title="Cairo: A Vector Graphics Library">
<link rel="up" href="cairo-surfaces.html" title="Surfaces">
<link rel="prev" href="cairo-cairo-surface-t.html" title="cairo_surface_t">
<link rel="next" href="cairo-PDF-Surfaces.html" title="PDF Surfaces">
<meta name="generator" content="GTK-Doc V1.20 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#cairo-Image-Surfaces.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#cairo-Image-Surfaces.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="cairo-surfaces.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="cairo-cairo-surface-t.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="cairo-PDF-Surfaces.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="cairo-Image-Surfaces"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-Image-Surfaces.top_of_page"></a>Image Surfaces</span></h2>
<p>Image Surfaces — Rendering to memory buffers</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-format-stride-for-width" title="cairo_format_stride_for_width ()">cairo_format_stride_for_width</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create" title="cairo_image_surface_create ()">cairo_image_surface_create</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create-for-data" title="cairo_image_surface_create_for_data ()">cairo_image_surface_create_for_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-data" title="cairo_image_surface_get_data ()">cairo_image_surface_get_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="returnvalue">cairo_format_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-format" title="cairo_image_surface_get_format ()">cairo_image_surface_get_format</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-width" title="cairo_image_surface_get_width ()">cairo_image_surface_get_width</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-height" title="cairo_image_surface_get_height ()">cairo_image_surface_get_height</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-stride" title="cairo_image_surface_get_stride ()">cairo_image_surface_get_stride</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-Image-Surfaces.html#CAIRO-HAS-IMAGE-SURFACE:CAPS" title="CAIRO_HAS_IMAGE_SURFACE">CAIRO_HAS_IMAGE_SURFACE</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t">cairo_format_t</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.description"></a><h2>Description</h2>
<p>Image surfaces provide the ability to render to memory buffers
either allocated by cairo or by the calling code.  The supported
image formats are those defined in <a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a>.</p>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cairo-format-stride-for-width"></a><h3>cairo_format_stride_for_width ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cairo_format_stride_for_width (<em class="parameter"><code><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> format</code></em>,
                               <em class="parameter"><code><span class="type">int</span> width</code></em>);</pre>
<p>This function provides a stride value that will respect all
alignment requirements of the accelerated image-rendering code
within cairo. Typical usage will be of the form:</p>
<div class="informalexample"><pre class="programlisting">
int stride;
unsigned char *data;
cairo_surface_t *surface;

stride = cairo_format_stride_for_width (format, width);
data = malloc (stride * height);
surface = cairo_image_surface_create_for_data (data, format,
					  width, height,
					  stride);
</pre></div>
<div class="refsect3">
<a name="id-1.5.4.7.2.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>A <a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>The desired width of an image surface to be created.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.2.7"></a><h4>Returns</h4>
<p> the appropriate stride to use given the desired
format and width, or -1 if either the format is invalid or the width
too large.</p>
<p></p>
</div>
<p class="since">Since 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-create"></a><h3>cairo_image_surface_create ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
cairo_image_surface_create (<em class="parameter"><code><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> format</code></em>,
                            <em class="parameter"><code><span class="type">int</span> width</code></em>,
                            <em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>Creates an image surface of the specified format and
dimensions. Initially the surface contents are all</p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>(Specifically, within each pixel, each color or alpha channel
belonging to format will be 0. The contents of bits within a pixel,
but not belonging to the given format are undefined).</p></li></ol></div>
<div class="refsect3">
<a name="id-1.5.4.7.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format of pixels in the surface to create</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>width of the surface, in pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>height of the surface, in pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.3.7"></a><h4>Returns</h4>
<p> a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.</p>
<p>This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-create-for-data"></a><h3>cairo_image_surface_create_for_data ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
cairo_image_surface_create_for_data (<em class="parameter"><code>unsigned <span class="type">char</span> *data</code></em>,
                                     <em class="parameter"><code><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> format</code></em>,
                                     <em class="parameter"><code><span class="type">int</span> width</code></em>,
                                     <em class="parameter"><code><span class="type">int</span> height</code></em>,
                                     <em class="parameter"><code><span class="type">int</span> stride</code></em>);</pre>
<p>Creates an image surface for the provided pixel data. The output
buffer must be kept around until the <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> is destroyed
or <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-finish" title="cairo_surface_finish ()"><code class="function">cairo_surface_finish()</code></a> is called on the surface.  The initial
contents of <em class="parameter"><code>data</code></em>
 will be used as the initial image contents; you
must explicitly clear the buffer, using, for example,
<a class="link" href="cairo-Paths.html#cairo-rectangle" title="cairo_rectangle ()"><code class="function">cairo_rectangle()</code></a> and <a class="link" href="cairo-cairo-t.html#cairo-fill" title="cairo_fill ()"><code class="function">cairo_fill()</code></a> if you want it cleared.</p>
<p>Note that the stride may be larger than
width*bytes_per_pixel to provide proper alignment for each pixel
and row. This alignment is required to allow high-performance rendering
within cairo. The correct way to obtain a legal stride value is to
call <a class="link" href="cairo-Image-Surfaces.html#cairo-format-stride-for-width" title="cairo_format_stride_for_width ()"><code class="function">cairo_format_stride_for_width()</code></a> with the desired format and
maximum image width value, and then use the resulting stride value
to allocate the data and to create the image surface. See
<a class="link" href="cairo-Image-Surfaces.html#cairo-format-stride-for-width" title="cairo_format_stride_for_width ()"><code class="function">cairo_format_stride_for_width()</code></a> for example code.</p>
<div class="refsect3">
<a name="id-1.5.4.7.4.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>a pointer to a buffer supplied by the application in which
to write contents. This pointer must be suitably aligned for any
kind of variable, (for example, a pointer returned by malloc).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>the format of pixels in the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>the width of the image to be stored in the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>the height of the image to be stored in the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stride</p></td>
<td class="parameter_description"><p>the number of bytes between the start of rows in the
buffer as allocated. This value should always be computed by
<a class="link" href="cairo-Image-Surfaces.html#cairo-format-stride-for-width" title="cairo_format_stride_for_width ()"><code class="function">cairo_format_stride_for_width()</code></a> before allocating the data
buffer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.4.7"></a><h4>Returns</h4>
<p> a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.</p>
<p>This function always returns a valid pointer, but it will return a
pointer to a "nil" surface in the case of an error such as out of
memory or an invalid stride value. In case of invalid stride value
the error status of the returned surface will be
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-STRIDE:CAPS"><code class="literal">CAIRO_STATUS_INVALID_STRIDE</code></a>.  You can use
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</p>
<p>See <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-user-data" title="cairo_surface_set_user_data ()"><code class="function">cairo_surface_set_user_data()</code></a> for a means of attaching a
destroy-notification fallback to the surface if necessary.</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-get-data"></a><h3>cairo_image_surface_get_data ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">char</span> *
cairo_image_surface_get_data (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>Get a pointer to the data of the image surface, for direct
inspection or modification.</p>
<p>A call to <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()"><code class="function">cairo_surface_flush()</code></a> is required before accessing the
pixel data to ensure that all pending drawing operations are
finished. A call to <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-mark-dirty" title="cairo_surface_mark_dirty ()"><code class="function">cairo_surface_mark_dirty()</code></a> is required after
the data is modified.</p>
<div class="refsect3">
<a name="id-1.5.4.7.5.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a <span class="type">cairo_image_surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.5.7"></a><h4>Returns</h4>
<p> a pointer to the image data of this surface or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
if <em class="parameter"><code>surface</code></em>
is not an image surface, or if <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-finish" title="cairo_surface_finish ()"><code class="function">cairo_surface_finish()</code></a>
has been called.</p>
<p></p>
</div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-get-format"></a><h3>cairo_image_surface_get_format ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="returnvalue">cairo_format_t</span></a>
cairo_image_surface_get_format (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>Get the format of the surface.</p>
<div class="refsect3">
<a name="id-1.5.4.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a <span class="type">cairo_image_surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.6.6"></a><h4>Returns</h4>
<p> the format of the surface</p>
<p></p>
</div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-get-width"></a><h3>cairo_image_surface_get_width ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cairo_image_surface_get_width (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>Get the width of the image surface in pixels.</p>
<div class="refsect3">
<a name="id-1.5.4.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a <span class="type">cairo_image_surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.7.6"></a><h4>Returns</h4>
<p> the width of the surface in pixels.</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-get-height"></a><h3>cairo_image_surface_get_height ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cairo_image_surface_get_height (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>Get the height of the image surface in pixels.</p>
<div class="refsect3">
<a name="id-1.5.4.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a <span class="type">cairo_image_surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.8.6"></a><h4>Returns</h4>
<p> the height of the surface in pixels.</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-image-surface-get-stride"></a><h3>cairo_image_surface_get_stride ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cairo_image_surface_get_stride (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>);</pre>
<p>Get the stride of the image surface in bytes</p>
<div class="refsect3">
<a name="id-1.5.4.7.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>surface</p></td>
<td class="parameter_description"><p>a <span class="type">cairo_image_surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.4.7.9.6"></a><h4>Returns</h4>
<p> the stride of the image surface in bytes (or 0 if
<em class="parameter"><code>surface</code></em>
is not an image surface). The stride is the distance in
bytes from the beginning of one row of the image data to the
beginning of the next row.</p>
<p></p>
</div>
<p class="since">Since 1.2</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CAIRO-HAS-IMAGE-SURFACE:CAPS"></a><h3>CAIRO_HAS_IMAGE_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_IMAGE_SURFACE 1
</pre>
<p>Defined if the image surface backend is available.
The image surface backend is always built in.
This macro was added for completeness in cairo 1.8.</p>
<p class="since">Since 1.8</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-format-t"></a><h3>enum cairo_format_t</h3>
<p><a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> is used to identify the memory format of
image data.</p>
<p>New entries may be added in future versions.</p>
<div class="refsect3">
<a name="id-1.5.4.8.3.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-INVALID:CAPS"></a>CAIRO_FORMAT_INVALID</p></td>
<td class="enum_member_description">
<p>no such format exists or is supported.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-ARGB32:CAPS"></a>CAIRO_FORMAT_ARGB32</p></td>
<td class="enum_member_description">
<p>each pixel is a 32-bit quantity, with
  alpha in the upper 8 bits, then red, then green, then blue.
  The 32-bit quantities are stored native-endian. Pre-multiplied
  alpha is used. (That is, 50% transparent red is 0x80800000,
  not 0x80ff0000.) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-RGB24:CAPS"></a>CAIRO_FORMAT_RGB24</p></td>
<td class="enum_member_description">
<p>each pixel is a 32-bit quantity, with
  the upper 8 bits unused. Red, Green, and Blue are stored
  in the remaining 24 bits in that order. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-A8:CAPS"></a>CAIRO_FORMAT_A8</p></td>
<td class="enum_member_description">
<p>each pixel is a 8-bit quantity holding
  an alpha value. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-A1:CAPS"></a>CAIRO_FORMAT_A1</p></td>
<td class="enum_member_description">
<p>each pixel is a 1-bit quantity holding
  an alpha value. Pixels are packed together into 32-bit
  quantities. The ordering of the bits matches the
  endianess of the platform. On a big-endian machine, the
  first pixel is in the uppermost bit, on a little-endian
  machine the first pixel is in the least-significant bit. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-RGB16-565:CAPS"></a>CAIRO_FORMAT_RGB16_565</p></td>
<td class="enum_member_description">
<p>each pixel is a 16-bit quantity
  with red in the upper 5 bits, then green in the middle
  6 bits, and blue in the lower 5 bits. (Since 1.2)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-FORMAT-RGB30:CAPS"></a>CAIRO_FORMAT_RGB30</p></td>
<td class="enum_member_description">
<p>like RGB24 but with 10bpc. (Since 1.12)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.0</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-Image-Surfaces.see-also"></a><h2>See Also</h2>
<p><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a></p>
</div>
</div>
<div class="footer">
<hr>
          Generated by GTK-Doc V1.20</div>
</body>
</html>