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<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-cairo-surface-t.top_of_page"></a>cairo_surface_t</span></h2>
<p>cairo_surface_t — Base class for surfaces</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<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-cairo-surface-t.html#cairo-surface-create-similar" title="cairo_surface_create_similar ()">cairo_surface_create_similar</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-cairo-surface-t.html#cairo-surface-create-similar-image" title="cairo_surface_create_similar_image ()">cairo_surface_create_similar_image</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-cairo-surface-t.html#cairo-surface-create-for-rectangle" title="cairo_surface_create_for_rectangle ()">cairo_surface_create_for_rectangle</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-cairo-surface-t.html#cairo-surface-reference" title="cairo_surface_reference ()">cairo_surface_reference</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()">cairo_surface_destroy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()">cairo_surface_status</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-finish" title="cairo_surface_finish ()">cairo_surface_finish</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()">cairo_surface_flush</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="returnvalue">cairo_device_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-device" title="cairo_surface_get_device ()">cairo_surface_get_device</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-font-options" title="cairo_surface_get_font_options ()">cairo_surface_get_font_options</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="returnvalue">cairo_content_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-content" title="cairo_surface_get_content ()">cairo_surface_get_content</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-mark-dirty" title="cairo_surface_mark_dirty ()">cairo_surface_mark_dirty</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-mark-dirty-rectangle" title="cairo_surface_mark_dirty_rectangle ()">cairo_surface_mark_dirty_rectangle</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-device-offset" title="cairo_surface_set_device_offset ()">cairo_surface_set_device_offset</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-device-offset" title="cairo_surface_get_device_offset ()">cairo_surface_get_device_offset</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-device-scale" title="cairo_surface_get_device_scale ()">cairo_surface_get_device_scale</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-device-scale" title="cairo_surface_set_device_scale ()">cairo_surface_set_device_scale</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-fallback-resolution" title="cairo_surface_set_fallback_resolution ()">cairo_surface_set_fallback_resolution</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-fallback-resolution" title="cairo_surface_get_fallback_resolution ()">cairo_surface_get_fallback_resolution</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-type-t" title="enum cairo_surface_type_t"><span class="returnvalue">cairo_surface_type_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-type" title="cairo_surface_get_type ()">cairo_surface_get_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-reference-count" title="cairo_surface_get_reference_count ()">cairo_surface_get_reference_count</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-user-data" title="cairo_surface_set_user_data ()">cairo_surface_set_user_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-user-data" title="cairo_surface_get_user_data ()">cairo_surface_get_user_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-copy-page" title="cairo_surface_copy_page ()">cairo_surface_copy_page</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-show-page" title="cairo_surface_show_page ()">cairo_surface_show_page</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-has-show-text-glyphs" title="cairo_surface_has_show_text_glyphs ()">cairo_surface_has_show_text_glyphs</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-mime-data" title="cairo_surface_set_mime_data ()">cairo_surface_set_mime_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-mime-data" title="cairo_surface_get_mime_data ()">cairo_surface_get_mime_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-supports-mime-type" title="cairo_surface_supports_mime_type ()">cairo_surface_supports_mime_type</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-cairo-surface-t.html#cairo-surface-map-to-image" title="cairo_surface_map_to_image ()">cairo_surface_map_to_image</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-unmap-image" title="cairo_surface_unmap_image ()">cairo_surface_unmap_image</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" 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-cairo-surface-t.html#CAIRO-HAS-MIME-SURFACE:CAPS" title="CAIRO_HAS_MIME_SURFACE">CAIRO_HAS_MIME_SURFACE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-CCITT-FAX:CAPS" title="CAIRO_MIME_TYPE_CCITT_FAX">CAIRO_MIME_TYPE_CCITT_FAX</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-CCITT-FAX-PARAMS:CAPS" title="CAIRO_MIME_TYPE_CCITT_FAX_PARAMS">CAIRO_MIME_TYPE_CCITT_FAX_PARAMS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-EPS:CAPS" title="CAIRO_MIME_TYPE_EPS">CAIRO_MIME_TYPE_EPS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-EPS-PARAMS:CAPS" title="CAIRO_MIME_TYPE_EPS_PARAMS">CAIRO_MIME_TYPE_EPS_PARAMS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2:CAPS" title="CAIRO_MIME_TYPE_JBIG2">CAIRO_MIME_TYPE_JBIG2</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL">CAIRO_MIME_TYPE_JBIG2_GLOBAL</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL-ID:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID">CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JP2:CAPS" title="CAIRO_MIME_TYPE_JP2">CAIRO_MIME_TYPE_JP2</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JPEG:CAPS" title="CAIRO_MIME_TYPE_JPEG">CAIRO_MIME_TYPE_JPEG</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-PNG:CAPS" title="CAIRO_MIME_TYPE_PNG">CAIRO_MIME_TYPE_PNG</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-URI:CAPS" title="CAIRO_MIME_TYPE_URI">CAIRO_MIME_TYPE_URI</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-UNIQUE-ID:CAPS" title="CAIRO_MIME_TYPE_UNIQUE_ID">CAIRO_MIME_TYPE_UNIQUE_ID</a></td>
</tr>
<tr>
<td class="typedef_keyword">typedef</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t">cairo_surface_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t">cairo_content_t</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-type-t" title="enum cairo_surface_type_t">cairo_surface_type_t</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.description"></a><h2>Description</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> is the abstract type representing all different drawing
targets that cairo can render to. The actual drawings are
performed using a cairo <em class="firstterm">context</em>.</p>
<p>A cairo surface is created by using <em class="firstterm">backend</em>-specific
constructors, typically of the form
<code class="function">cairo_<span class="emphasis"><em>backend</em></span>_surface_create()</code>.</p>
<p>Most surface types allow accessing the surface without using Cairo
functions. If you do this, keep in mind that it is mandatory that you call
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()"><code class="function">cairo_surface_flush()</code></a> before reading from or writing to the surface and that
you must use <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> after modifying it.</p>
<div class="example">
<a name="id-1.5.3.5.5"></a><p class="title"><b>Example 1. Directly modifying an image surface</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">void</span>
<span class="function">modify_image_surface</span> <span class="gtkdoc opt">(</span>cairo_surface_t <span class="gtkdoc opt">*</span>surface<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="gtkdoc kwb">unsigned char</span> <span class="gtkdoc opt">*</span>data<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwb">int</span> width<span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">,</span> stride<span class="gtkdoc opt">;</span>
<span class="gtkdoc slc">// flush to ensure all writing to the image was done</span>
<span class="function"><a href="cairo-cairo-surface-t.html#cairo-surface-flush">cairo_surface_flush</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
<span class="gtkdoc slc">// modify the image</span>
data <span class="gtkdoc opt">=</span> <span class="function"><a href="cairo-Image-Surfaces.html#cairo-image-surface-get-data">cairo_image_surface_get_data</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
width <span class="gtkdoc opt">=</span> <span class="function"><a href="cairo-Image-Surfaces.html#cairo-image-surface-get-width">cairo_image_surface_get_width</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
height <span class="gtkdoc opt">=</span> <span class="function"><a href="cairo-Image-Surfaces.html#cairo-image-surface-get-height">cairo_image_surface_get_height</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
stride <span class="gtkdoc opt">=</span> <span class="function"><a href="cairo-Image-Surfaces.html#cairo-image-surface-get-stride">cairo_image_surface_get_stride</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
<span class="function">modify_image_data</span> <span class="gtkdoc opt">(</span>data<span class="gtkdoc opt">,</span> width<span class="gtkdoc opt">,</span> height<span class="gtkdoc opt">,</span> stride<span class="gtkdoc opt">);</span>
<span class="gtkdoc slc">// mark the image dirty so Cairo clears its caches.</span>
<span class="function"><a href="cairo-cairo-surface-t.html#cairo-surface-mark-dirty">cairo_surface_mark_dirty</a></span> <span class="gtkdoc opt">(</span>surface<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>Note that for other surface types it might be necessary to acquire the
surface's device first. See <a class="link" href="cairo-cairo-device-t.html#cairo-device-acquire" title="cairo_device_acquire ()"><code class="function">cairo_device_acquire()</code></a> for a discussion of
devices.</p>
</div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cairo-surface-create-similar"></a><h3>cairo_surface_create_similar ()</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_surface_create_similar (<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> *other</code></em>,
<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> content</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>Create a new surface that is as compatible as possible with an
existing surface. For example the new surface will have the same
device scale, fallback resolution and font options as
<em class="parameter"><code>other</code></em>
. Generally, the new surface will also use the same backend
as <em class="parameter"><code>other</code></em>
, unless that is not possible for some reason. The type of
the returned surface may be examined with
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-type" title="cairo_surface_get_type ()"><code class="function">cairo_surface_get_type()</code></a>.</p>
<p>Initially the surface contents are all 0 (transparent if contents
have transparency, black otherwise.)</p>
<p>Use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-similar-image" title="cairo_surface_create_similar_image ()"><code class="function">cairo_surface_create_similar_image()</code></a> if you need an image surface
which can be painted quickly to the target surface.</p>
<div class="refsect3">
<a name="cairo-surface-create-similar.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>other</p></td>
<td class="parameter_description"><p>an existing surface used to select the backend of the new surface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>content</p></td>
<td class="parameter_description"><p>the content for the new surface</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 new surface, (in device-space units)</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 new surface (in device-space units)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-create-similar.returns"></a><h4>Returns</h4>
<p> a pointer to the newly allocated 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 <em class="parameter"><code>other</code></em>
is already in an error state
or any other error occurs.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-create-similar-image"></a><h3>cairo_surface_create_similar_image ()</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_surface_create_similar_image (<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> *other</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>);</pre>
<p>Create a new image surface that is as compatible as possible for uploading
to and the use in conjunction with an existing surface. However, this surface
can still be used like any normal image surface. Unlike
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-similar" title="cairo_surface_create_similar ()"><code class="function">cairo_surface_create_similar()</code></a> the new image surface won't inherit
the device scale from <em class="parameter"><code>other</code></em>
.</p>
<p>Initially the surface contents are all 0 (transparent if contents
have transparency, black otherwise.)</p>
<p>Use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-similar" title="cairo_surface_create_similar ()"><code class="function">cairo_surface_create_similar()</code></a> if you don't need an image surface.</p>
<div class="refsect3">
<a name="cairo-surface-create-similar-image.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>other</p></td>
<td class="parameter_description"><p>an existing surface used to select the preference of the new surface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>the format for the new surface</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 new 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 new surface (in pixels)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-create-similar-image.returns"></a><h4>Returns</h4>
<p> a pointer to the newly allocated image 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 <em class="parameter"><code>other</code></em>
is already in an error state
or any other error occurs.</p>
</div>
<p class="since">Since: 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-create-for-rectangle"></a><h3>cairo_surface_create_for_rectangle ()</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_surface_create_for_rectangle (<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> *target</code></em>,
<em class="parameter"><code><span class="type">double</span> x</code></em>,
<em class="parameter"><code><span class="type">double</span> y</code></em>,
<em class="parameter"><code><span class="type">double</span> width</code></em>,
<em class="parameter"><code><span class="type">double</span> height</code></em>);</pre>
<p>Create a new surface that is a rectangle within the target surface.
All operations drawn to this surface are then clipped and translated
onto the target surface. Nothing drawn via this sub-surface outside of
its bounds is drawn onto the target surface, making this a useful method
for passing constrained child surfaces to library routines that draw
directly onto the parent surface, i.e. with no further backend allocations,
double buffering or copies.</p>
<div class="note"><p>The semantics of subsurfaces have not been finalized yet
unless the rectangle is in full device units, is contained within
the extents of the target surface, and the target or subsurface's
device transforms are not changed.</p></div>
<div class="refsect3">
<a name="cairo-surface-create-for-rectangle.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>target</p></td>
<td class="parameter_description"><p>an existing surface for which the sub-surface will point to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>the x-origin of the sub-surface from the top-left of the target surface (in device-space units)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>the y-origin of the sub-surface from the top-left of the target surface (in device-space units)</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 sub-surface (in device-space units)</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 sub-surface (in device-space units)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-create-for-rectangle.returns"></a><h4>Returns</h4>
<p> a pointer to the newly allocated 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 <em class="parameter"><code>other</code></em>
is already in an error state
or any other error occurs.</p>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-reference"></a><h3>cairo_surface_reference ()</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_surface_reference (<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>Increases the reference count on <em class="parameter"><code>surface</code></em>
by one. This prevents
<em class="parameter"><code>surface</code></em>
from being destroyed until a matching call to
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> is made.</p>
<p>Use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-reference-count" title="cairo_surface_get_reference_count ()"><code class="function">cairo_surface_get_reference_count()</code></a> to get the number of
references to a <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 class="refsect3">
<a name="cairo-surface-reference.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-reference.returns"></a><h4>Returns</h4>
<p> the referenced <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>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-destroy"></a><h3>cairo_surface_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_destroy (<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>Decreases the reference count on <em class="parameter"><code>surface</code></em>
by one. If the result is
zero, then <em class="parameter"><code>surface</code></em>
and all associated resources are freed. See
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-reference" title="cairo_surface_reference ()"><code class="function">cairo_surface_reference()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-destroy.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-status"></a><h3>cairo_surface_status ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
cairo_surface_status (<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>Checks whether an error has previously occurred for this
surface.</p>
<div class="refsect3">
<a name="cairo-surface-status.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-status.returns"></a><h4>Returns</h4>
<p> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a>, <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NULL-POINTER:CAPS"><code class="literal">CAIRO_STATUS_NULL_POINTER</code></a>,
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a>, <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-READ-ERROR:CAPS"><code class="literal">CAIRO_STATUS_READ_ERROR</code></a>,
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-CONTENT:CAPS"><code class="literal">CAIRO_STATUS_INVALID_CONTENT</code></a>, <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-FORMAT:CAPS"><code class="literal">CAIRO_STATUS_INVALID_FORMAT</code></a>, or
<a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-INVALID-VISUAL:CAPS"><code class="literal">CAIRO_STATUS_INVALID_VISUAL</code></a>.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-finish"></a><h3>cairo_surface_finish ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_finish (<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>This function finishes the surface and drops all references to
external resources. For example, for the Xlib backend it means
that cairo will no longer access the drawable, which can be freed.
After calling <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-finish" title="cairo_surface_finish ()"><code class="function">cairo_surface_finish()</code></a> the only valid operations on a
surface are getting and setting user, referencing and
destroying, and flushing and finishing it.
Further drawing to the surface will not affect the
surface but will instead trigger a <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SURFACE-FINISHED:CAPS"><code class="literal">CAIRO_STATUS_SURFACE_FINISHED</code></a>
error.</p>
<p>When the last call to <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> decreases the
reference count to zero, cairo will call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-finish" title="cairo_surface_finish ()"><code class="function">cairo_surface_finish()</code></a> if
it hasn't been called already, before freeing the resources
associated with the surface.</p>
<div class="refsect3">
<a name="cairo-surface-finish.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>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> to finish</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-flush"></a><h3>cairo_surface_flush ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_flush (<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>Do any pending drawing for the surface and also restore any temporary
modifications cairo has made to the surface's state. This function
must be called before switching from drawing on the surface with
cairo to drawing on it directly with native APIs, or accessing its
memory outside of Cairo. If the surface doesn't support direct
access, then this function does nothing.</p>
<div class="refsect3">
<a name="cairo-surface-flush.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-device"></a><h3>cairo_surface_get_device ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="returnvalue">cairo_device_t</span></a> *
cairo_surface_get_device (<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>This function returns the device for a <em class="parameter"><code>surface</code></em>
.
See <a class="link" href="cairo-cairo-device-t.html#cairo-device-t" title="cairo_device_t"><span class="type">cairo_device_t</span></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-device.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-get-device.returns"></a><h4>Returns</h4>
<p> The device for <em class="parameter"><code>surface</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the surface does
not have an associated device.</p>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-font-options"></a><h3>cairo_surface_get_font_options ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_get_font_options (<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>,
<em class="parameter"><code><a class="link" href="cairo-cairo-font-options-t.html#cairo-font-options-t" title="cairo_font_options_t"><span class="type">cairo_font_options_t</span></a> *options</code></em>);</pre>
<p>Retrieves the default font rendering options for the surface.
This allows display surfaces to report the correct subpixel order
for rendering on them, print surfaces to disable hinting of
metrics and so forth. The result can then be used with
<a class="link" href="cairo-cairo-scaled-font-t.html#cairo-scaled-font-create" title="cairo_scaled_font_create ()"><code class="function">cairo_scaled_font_create()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-font-options.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>options</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-cairo-font-options-t.html#cairo-font-options-t" title="cairo_font_options_t"><span class="type">cairo_font_options_t</span></a> object into which to store
the retrieved options. All existing values are overwritten</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-content"></a><h3>cairo_surface_get_content ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="returnvalue">cairo_content_t</span></a>
cairo_surface_get_content (<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>This function returns the content type of <em class="parameter"><code>surface</code></em>
which indicates
whether the surface contains color and/or alpha information. See
<a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-content.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-get-content.returns"></a><h4>Returns</h4>
<p> The content type of <em class="parameter"><code>surface</code></em>
.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-mark-dirty"></a><h3>cairo_surface_mark_dirty ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_mark_dirty (<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>Tells cairo that drawing has been done to surface using means other
than cairo, and that cairo should reread any cached areas. Note
that you must call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-flush" title="cairo_surface_flush ()"><code class="function">cairo_surface_flush()</code></a> before doing such drawing.</p>
<div class="refsect3">
<a name="cairo-surface-mark-dirty.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-mark-dirty-rectangle"></a><h3>cairo_surface_mark_dirty_rectangle ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_mark_dirty_rectangle (<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>,
<em class="parameter"><code><span class="type">int</span> x</code></em>,
<em class="parameter"><code><span class="type">int</span> y</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>Like <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>, but drawing has been done only to
the specified rectangle, so that cairo can retain cached contents
for other parts of the surface.</p>
<p>Any cached clip set on the surface will be reset by this function,
to make sure that future cairo calls have the clip set that they
expect.</p>
<div class="refsect3">
<a name="cairo-surface-mark-dirty-rectangle.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>X coordinate of dirty rectangle</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>Y coordinate of dirty rectangle</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>width of dirty rectangle</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>height of dirty rectangle</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-set-device-offset"></a><h3>cairo_surface_set_device_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_set_device_offset (<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>,
<em class="parameter"><code><span class="type">double</span> x_offset</code></em>,
<em class="parameter"><code><span class="type">double</span> y_offset</code></em>);</pre>
<p>Sets an offset that is added to the device coordinates determined
by the CTM when drawing to <em class="parameter"><code>surface</code></em>
. One use case for this function
is when we want to create a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> that redirects drawing
for a portion of an onscreen surface to an offscreen surface in a
way that is completely invisible to the user of the cairo
API. Setting a transformation via <a class="link" href="cairo-Transformations.html#cairo-translate" title="cairo_translate ()"><code class="function">cairo_translate()</code></a> isn't
sufficient to do this, since functions like
<a class="link" href="cairo-Transformations.html#cairo-device-to-user" title="cairo_device_to_user ()"><code class="function">cairo_device_to_user()</code></a> will expose the hidden offset.</p>
<p>Note that the offset affects drawing to the surface as well as
using the surface in a source pattern.</p>
<div class="refsect3">
<a name="cairo-surface-set-device-offset.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_offset</p></td>
<td class="parameter_description"><p>the offset in the X direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_offset</p></td>
<td class="parameter_description"><p>the offset in the Y direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-device-offset"></a><h3>cairo_surface_get_device_offset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_get_device_offset (<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>,
<em class="parameter"><code><span class="type">double</span> *x_offset</code></em>,
<em class="parameter"><code><span class="type">double</span> *y_offset</code></em>);</pre>
<p>This function returns the previous device offset set by
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-device-offset" title="cairo_surface_set_device_offset ()"><code class="function">cairo_surface_set_device_offset()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-device-offset.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_offset</p></td>
<td class="parameter_description"><p>the offset in the X direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_offset</p></td>
<td class="parameter_description"><p>the offset in the Y direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-device-scale"></a><h3>cairo_surface_get_device_scale ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_get_device_scale (<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>,
<em class="parameter"><code><span class="type">double</span> *x_scale</code></em>,
<em class="parameter"><code><span class="type">double</span> *y_scale</code></em>);</pre>
<p>This function returns the previous device offset set by
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-device-scale" title="cairo_surface_set_device_scale ()"><code class="function">cairo_surface_set_device_scale()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-device-scale.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_scale</p></td>
<td class="parameter_description"><p>the scale in the X direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_scale</p></td>
<td class="parameter_description"><p>the scale in the Y direction, in device units</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.14</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-set-device-scale"></a><h3>cairo_surface_set_device_scale ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_set_device_scale (<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>,
<em class="parameter"><code><span class="type">double</span> x_scale</code></em>,
<em class="parameter"><code><span class="type">double</span> y_scale</code></em>);</pre>
<p>Sets a scale that is multiplied to the device coordinates determined
by the CTM when drawing to <em class="parameter"><code>surface</code></em>
. One common use for this is to
render to very high resolution display devices at a scale factor, so
that code that assumes 1 pixel will be a certain size will still work.
Setting a transformation via <a class="link" href="cairo-Transformations.html#cairo-translate" title="cairo_translate ()"><code class="function">cairo_translate()</code></a> isn't
sufficient to do this, since functions like
<a class="link" href="cairo-Transformations.html#cairo-device-to-user" title="cairo_device_to_user ()"><code class="function">cairo_device_to_user()</code></a> will expose the hidden scale.</p>
<p>Note that the scale affects drawing to the surface as well as
using the surface in a source pattern.</p>
<div class="refsect3">
<a name="cairo-surface-set-device-scale.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_scale</p></td>
<td class="parameter_description"><p>a scale factor in the X direction</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_scale</p></td>
<td class="parameter_description"><p>a scale factor in the Y direction</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.14</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-set-fallback-resolution"></a><h3>cairo_surface_set_fallback_resolution ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_set_fallback_resolution (<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>,
<em class="parameter"><code><span class="type">double</span> x_pixels_per_inch</code></em>,
<em class="parameter"><code><span class="type">double</span> y_pixels_per_inch</code></em>);</pre>
<p>Set the horizontal and vertical resolution for image fallbacks.</p>
<p>When certain operations aren't supported natively by a backend,
cairo will fallback by rendering operations to an image and then
overlaying that image onto the output. For backends that are
natively vector-oriented, this function can be used to set the
resolution used for these image fallbacks, (larger values will
result in more detailed images, but also larger file sizes).</p>
<p>Some examples of natively vector-oriented backends are the ps, pdf,
and svg backends.</p>
<p>For backends that are natively raster-oriented, image fallbacks are
still possible, but they are always performed at the native
device resolution. So this function has no effect on those
backends.</p>
<p>Note: The fallback resolution only takes effect at the time of
completing a page (with <a class="link" href="cairo-cairo-t.html#cairo-show-page" title="cairo_show_page ()"><code class="function">cairo_show_page()</code></a> or <a class="link" href="cairo-cairo-t.html#cairo-copy-page" title="cairo_copy_page ()"><code class="function">cairo_copy_page()</code></a>) so
there is currently no way to have more than one fallback resolution
in effect on a single page.</p>
<p>The default fallback resoultion is 300 pixels per inch in both
dimensions.</p>
<div class="refsect3">
<a name="cairo-surface-set-fallback-resolution.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_pixels_per_inch</p></td>
<td class="parameter_description"><p>horizontal setting for pixels per inch</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_pixels_per_inch</p></td>
<td class="parameter_description"><p>vertical setting for pixels per inch</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-fallback-resolution"></a><h3>cairo_surface_get_fallback_resolution ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_get_fallback_resolution (<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>,
<em class="parameter"><code><span class="type">double</span> *x_pixels_per_inch</code></em>,
<em class="parameter"><code><span class="type">double</span> *y_pixels_per_inch</code></em>);</pre>
<p>This function returns the previous fallback resolution set by
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-fallback-resolution" title="cairo_surface_set_fallback_resolution ()"><code class="function">cairo_surface_set_fallback_resolution()</code></a>, or default fallback
resolution if never set.</p>
<div class="refsect3">
<a name="cairo-surface-get-fallback-resolution.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_pixels_per_inch</p></td>
<td class="parameter_description"><p>horizontal pixels per inch</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_pixels_per_inch</p></td>
<td class="parameter_description"><p>vertical pixels per inch</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.8</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-type"></a><h3>cairo_surface_get_type ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-type-t" title="enum cairo_surface_type_t"><span class="returnvalue">cairo_surface_type_t</span></a>
cairo_surface_get_type (<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>This function returns the type of the backend used to create
a surface. See <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-type-t" title="enum cairo_surface_type_t"><span class="type">cairo_surface_type_t</span></a> for available types.</p>
<div class="refsect3">
<a name="cairo-surface-get-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-get-type.returns"></a><h4>Returns</h4>
<p> The type of <em class="parameter"><code>surface</code></em>
.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-reference-count"></a><h3>cairo_surface_get_reference_count ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
cairo_surface_get_reference_count (<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>Returns the current reference count of <em class="parameter"><code>surface</code></em>
.</p>
<div class="refsect3">
<a name="cairo-surface-get-reference-count.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-get-reference-count.returns"></a><h4>Returns</h4>
<p> the current reference count of <em class="parameter"><code>surface</code></em>
. If the
object is a nil object, 0 will be returned.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-set-user-data"></a><h3>cairo_surface_set_user_data ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
cairo_surface_set_user_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>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
<em class="parameter"><code><a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> destroy</code></em>);</pre>
<p>Attach user data to <em class="parameter"><code>surface</code></em>
. To remove user data from a surface,
call this function with the key that was used to set it and <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
for <em class="parameter"><code>data</code></em>
.</p>
<div class="refsect3">
<a name="cairo-surface-set-user-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>the address of a <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> to attach the user data to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the user data to attach to the surface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> which will be called when the
surface is destroyed or when new user data is attached using the
same key.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-set-user-data.returns"></a><h4>Returns</h4>
<p> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> or <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a> if a
slot could not be allocated for the user data.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-user-data"></a><h3>cairo_surface_get_user_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
cairo_surface_get_user_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>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> *key</code></em>);</pre>
<p>Return user data previously attached to <em class="parameter"><code>surface</code></em>
using the specified
key. If no user data has been attached with the given key this
function returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-user-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>the address of the <a class="link" href="cairo-Types.html#cairo-user-data-key-t" title="cairo_user_data_key_t"><span class="type">cairo_user_data_key_t</span></a> the user data was
attached to</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-get-user-data.returns"></a><h4>Returns</h4>
<p> the user data previously attached or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-copy-page"></a><h3>cairo_surface_copy_page ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_copy_page (<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>Emits the current page for backends that support multiple pages,
but doesn't clear it, so that the contents of the current page will
be retained for the next page. Use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-show-page" title="cairo_surface_show_page ()"><code class="function">cairo_surface_show_page()</code></a> if you
want to get an empty page after the emission.</p>
<p>There is a convenience function for this that takes a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>,
namely <a class="link" href="cairo-cairo-t.html#cairo-copy-page" title="cairo_copy_page ()"><code class="function">cairo_copy_page()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-copy-page.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-show-page"></a><h3>cairo_surface_show_page ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_show_page (<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>Emits and clears the current page for backends that support multiple
pages. Use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-copy-page" title="cairo_surface_copy_page ()"><code class="function">cairo_surface_copy_page()</code></a> if you don't want to clear the page.</p>
<p>There is a convenience function for this that takes a <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>,
namely <a class="link" href="cairo-cairo-t.html#cairo-show-page" title="cairo_show_page ()"><code class="function">cairo_show_page()</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-show-page.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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_Surface_t</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-has-show-text-glyphs"></a><h3>cairo_surface_has_show_text_glyphs ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
cairo_surface_has_show_text_glyphs (<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>Returns whether the surface supports
sophisticated <a class="link" href="cairo-text.html#cairo-show-text-glyphs" title="cairo_show_text_glyphs ()"><code class="function">cairo_show_text_glyphs()</code></a> operations. That is,
whether it actually uses the provided text and cluster data
to a <a class="link" href="cairo-text.html#cairo-show-text-glyphs" title="cairo_show_text_glyphs ()"><code class="function">cairo_show_text_glyphs()</code></a> call.</p>
<p>Note: Even if this function returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, a
<a class="link" href="cairo-text.html#cairo-show-text-glyphs" title="cairo_show_text_glyphs ()"><code class="function">cairo_show_text_glyphs()</code></a> operation targeted at <em class="parameter"><code>surface</code></em>
will
still succeed. It just will
act like a <a class="link" href="cairo-text.html#cairo-show-glyphs" title="cairo_show_glyphs ()"><code class="function">cairo_show_glyphs()</code></a> operation. Users can use this
function to avoid computing UTF-8 text and cluster mapping if the
target surface does not use it.</p>
<div class="refsect3">
<a name="cairo-surface-has-show-text-glyphs.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-has-show-text-glyphs.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>surface</code></em>
supports
<a class="link" href="cairo-text.html#cairo-show-text-glyphs" title="cairo_show_text_glyphs ()"><code class="function">cairo_show_text_glyphs()</code></a>, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</p>
</div>
<p class="since">Since: 1.8</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-set-mime-data"></a><h3>cairo_surface_set_mime_data ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="returnvalue">cairo_status_t</span></a>
cairo_surface_set_mime_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>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *data</code></em>,
<em class="parameter"><code><span class="type">unsigned long </span> length</code></em>,
<em class="parameter"><code><a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> destroy</code></em>,
<em class="parameter"><code><span class="type">void</span> *closure</code></em>);</pre>
<p>Attach an image in the format <em class="parameter"><code>mime_type</code></em>
to <em class="parameter"><code>surface</code></em>
. To remove
the data from a surface, call this function with same mime type
and <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for <em class="parameter"><code>data</code></em>
.</p>
<p>The attached image (or filename) data can later be used by backends
which support it (currently: PDF, PS, SVG and Win32 Printing
surfaces) to emit this data instead of making a snapshot of the
<em class="parameter"><code>surface</code></em>
. This approach tends to be faster and requires less
memory and disk space.</p>
<p>The recognized MIME types are the following: <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JPEG:CAPS" title="CAIRO_MIME_TYPE_JPEG"><code class="literal">CAIRO_MIME_TYPE_JPEG</code></a>,
<a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-PNG:CAPS" title="CAIRO_MIME_TYPE_PNG"><code class="literal">CAIRO_MIME_TYPE_PNG</code></a>, <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JP2:CAPS" title="CAIRO_MIME_TYPE_JP2"><code class="literal">CAIRO_MIME_TYPE_JP2</code></a>, <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-URI:CAPS" title="CAIRO_MIME_TYPE_URI"><code class="literal">CAIRO_MIME_TYPE_URI</code></a>,
<a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-UNIQUE-ID:CAPS" title="CAIRO_MIME_TYPE_UNIQUE_ID"><code class="literal">CAIRO_MIME_TYPE_UNIQUE_ID</code></a>, <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2:CAPS" title="CAIRO_MIME_TYPE_JBIG2"><code class="literal">CAIRO_MIME_TYPE_JBIG2</code></a>,
<a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL"><code class="literal">CAIRO_MIME_TYPE_JBIG2_GLOBAL</code></a>, <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL-ID:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID"><code class="literal">CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID</code></a>,
<a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-CCITT-FAX:CAPS" title="CAIRO_MIME_TYPE_CCITT_FAX"><code class="literal">CAIRO_MIME_TYPE_CCITT_FAX</code></a>, <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-CCITT-FAX-PARAMS:CAPS" title="CAIRO_MIME_TYPE_CCITT_FAX_PARAMS"><code class="literal">CAIRO_MIME_TYPE_CCITT_FAX_PARAMS</code></a>.</p>
<p>See corresponding backend surface docs for details about which MIME
types it can handle. Caution: the associated MIME data will be
discarded if you draw on the surface afterwards. Use this function
with care.</p>
<p>Even if a backend supports a MIME type, that does not mean cairo
will always be able to use the attached MIME data. For example, if
the backend does not natively support the compositing operation used
to apply the MIME data to the backend. In that case, the MIME data
will be ignored. Therefore, to apply an image in all cases, it is best
to create an image surface which contains the decoded image data and
then attach the MIME data to that. This ensures the image will always
be used while still allowing the MIME data to be used whenever
possible.</p>
<div class="refsect3">
<a name="cairo-surface-set-mime-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mime_type</p></td>
<td class="parameter_description"><p>the MIME type of the image data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>the image data to attach to the surface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>the length of the image data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-Types.html#cairo-destroy-func-t" title="cairo_destroy_func_t ()"><span class="type">cairo_destroy_func_t</span></a> which will be called when the
surface is destroyed or when new image data is attached using the
same mime type.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>closure</p></td>
<td class="parameter_description"><p>the data to be passed to the <em class="parameter"><code>destroy</code></em>
notifier</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-set-mime-data.returns"></a><h4>Returns</h4>
<p> <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> or <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a> if a
slot could not be allocated for the user data.</p>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-get-mime-data"></a><h3>cairo_surface_get_mime_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_get_mime_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>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> **data</code></em>,
<em class="parameter"><code>unsigned <span class="type">long</span> *length</code></em>);</pre>
<p>Return mime data previously attached to <em class="parameter"><code>surface</code></em>
using the
specified mime type. If no data has been attached with the given
mime type, <em class="parameter"><code>data</code></em>
is set <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="cairo-surface-get-mime-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mime_type</p></td>
<td class="parameter_description"><p>the mime type of the image data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>the image data to attached to the surface</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>the length of the image data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-supports-mime-type"></a><h3>cairo_surface_supports_mime_type ()</h3>
<pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a>
cairo_surface_supports_mime_type (<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>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>);</pre>
<p>Return whether <em class="parameter"><code>surface</code></em>
supports <em class="parameter"><code>mime_type</code></em>
.</p>
<div class="refsect3">
<a name="cairo-surface-supports-mime-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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 <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></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mime_type</p></td>
<td class="parameter_description"><p>the mime type</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-supports-mime-type.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>surface</code></em>
supports
<em class="parameter"><code>mime_type</code></em>
, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</p>
</div>
<p class="since">Since: 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-map-to-image"></a><h3>cairo_surface_map_to_image ()</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_surface_map_to_image (<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>,
<em class="parameter"><code>const <a class="link" href="cairo-Types.html#cairo-rectangle-int-t" title="cairo_rectangle_int_t"><span class="type">cairo_rectangle_int_t</span></a> *extents</code></em>);</pre>
<p>Returns an image surface that is the most efficient mechanism for
modifying the backing store of the target surface. The region retrieved
may be limited to the <em class="parameter"><code>extents</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for the whole surface</p>
<p>Note, the use of the original surface as a target or source whilst
it is mapped is undefined. The result of mapping the surface
multiple times is undefined. Calling <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> 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> on the resulting image surface results in
undefined behavior. Changing the device transform of the image
surface or of <em class="parameter"><code>surface</code></em>
before the image surface is unmapped results
in undefined behavior.</p>
<div class="refsect3">
<a name="cairo-surface-map-to-image.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>an existing surface used to extract the image from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>extents</p></td>
<td class="parameter_description"><p>limit the extraction to an rectangular region</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-surface-map-to-image.returns"></a><h4>Returns</h4>
<p> a pointer to the newly allocated image surface. The caller
must use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-unmap-image" title="cairo_surface_unmap_image ()"><code class="function">cairo_surface_unmap_image()</code></a> to destroy this image surface.</p>
<p>This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if <em class="parameter"><code>other</code></em>
is already in an error state
or any other error occurs. If the returned pointer does not have an
error status, it is guaranteed to be an image surface whose format
is not <a class="link" href="cairo-Image-Surfaces.html#CAIRO-FORMAT-INVALID:CAPS"><code class="literal">CAIRO_FORMAT_INVALID</code></a>.</p>
</div>
<p class="since">Since: 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-unmap-image"></a><h3>cairo_surface_unmap_image ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_surface_unmap_image (<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>,
<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> *image</code></em>);</pre>
<p>Unmaps the image surface as returned from <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-map-to-image" title="cairo_surface_map_to_image ()"><code class="function">cairo_surface_map_to_image()</code></a>.</p>
<p>The content of the image will be uploaded to the target surface.
Afterwards, the image is destroyed.</p>
<p>Using an image surface which wasn't returned by <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-map-to-image" title="cairo_surface_map_to_image ()"><code class="function">cairo_surface_map_to_image()</code></a>
results in undefined behavior.</p>
<div class="refsect3">
<a name="cairo-surface-unmap-image.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>the surface passed to <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-map-to-image" title="cairo_surface_map_to_image ()"><code class="function">cairo_surface_map_to_image()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>the currently mapped image</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.12</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CAIRO-HAS-MIME-SURFACE:CAPS"></a><h3>CAIRO_HAS_MIME_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_MIME_SURFACE 1
</pre>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-CCITT-FAX:CAPS"></a><h3>CAIRO_MIME_TYPE_CCITT_FAX</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_CCITT_FAX "image/g3fax"
</pre>
<p>Group 3 or Group 4 CCITT facsimile encoding (International
Telecommunication Union, Recommendations T.4 and T.6.)</p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-CCITT-FAX-PARAMS:CAPS"></a><h3>CAIRO_MIME_TYPE_CCITT_FAX_PARAMS</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_CCITT_FAX_PARAMS "application/x-cairo.ccitt.params"
</pre>
<p>Decode parameters for Group 3 or Group 4 CCITT facsimile encoding.
See <a class="link" href="cairo-PDF-Surfaces.html#ccitt" title="CCITT Fax Images">CCITT Fax Images</a>.</p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-EPS:CAPS"></a><h3>CAIRO_MIME_TYPE_EPS</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_EPS "application/postscript"
</pre>
<p>Encapsulated PostScript file.
<a class="ulink" href="http://wwwimages.adobe.com/content/dam/Adobe/endevnet/postscript/pdfs/5002.EPSF_Spec.pdf" target="_top">Encapsulated PostScript File Format Specification</a></p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-EPS-PARAMS:CAPS"></a><h3>CAIRO_MIME_TYPE_EPS_PARAMS</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_EPS_PARAMS "application/x-cairo.eps.params"
</pre>
<p>Embedding parameters Encapsulated PostScript data.
See <a class="link" href="cairo-PostScript-Surfaces.html#eps" title="Embedding EPS files">Embedding EPS files</a>.</p>
<p class="since">Since: 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-JBIG2:CAPS"></a><h3>CAIRO_MIME_TYPE_JBIG2</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_JBIG2 "application/x-cairo.jbig2"
</pre>
<p>Joint Bi-level Image Experts Group image coding standard (ISO/IEC 11544).</p>
<p class="since">Since: 1.14</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-JBIG2-GLOBAL:CAPS"></a><h3>CAIRO_MIME_TYPE_JBIG2_GLOBAL</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_JBIG2_GLOBAL "application/x-cairo.jbig2-global"
</pre>
<p>Joint Bi-level Image Experts Group image coding standard (ISO/IEC 11544) global segment.</p>
<p class="since">Since: 1.14</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-JBIG2-GLOBAL-ID:CAPS"></a><h3>CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID "application/x-cairo.jbig2-global-id"
</pre>
<p>An unique identifier shared by a JBIG2 global segment and all JBIG2 images
that depend on the global segment.</p>
<p class="since">Since: 1.14</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-JP2:CAPS"></a><h3>CAIRO_MIME_TYPE_JP2</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_JP2 "image/jp2"
</pre>
<p>The Joint Photographic Experts Group (JPEG) 2000 image coding standard (ISO/IEC 15444-1).</p>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-JPEG:CAPS"></a><h3>CAIRO_MIME_TYPE_JPEG</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_JPEG "image/jpeg"
</pre>
<p>The Joint Photographic Experts Group (JPEG) image coding standard (ISO/IEC 10918-1).</p>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-PNG:CAPS"></a><h3>CAIRO_MIME_TYPE_PNG</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_PNG "image/png"
</pre>
<p>The Portable Network Graphics image file format (ISO/IEC 15948).</p>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-URI:CAPS"></a><h3>CAIRO_MIME_TYPE_URI</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_URI "text/x-uri"
</pre>
<p>URI for an image file (unofficial MIME type).</p>
<p class="since">Since: 1.10</p>
</div>
<hr>
<div class="refsect2">
<a name="CAIRO-MIME-TYPE-UNIQUE-ID:CAPS"></a><h3>CAIRO_MIME_TYPE_UNIQUE_ID</h3>
<pre class="programlisting">#define CAIRO_MIME_TYPE_UNIQUE_ID "application/x-cairo.uuid"
</pre>
<p>Unique identifier for a surface (cairo specific MIME type). All surfaces with
the same unique identifier will only be embedded once.</p>
<p class="since">Since: 1.12</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-t"></a><h3>cairo_surface_t</h3>
<pre class="programlisting">typedef struct _cairo_surface cairo_surface_t;
</pre>
<p>A <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> represents an image, either as the destination
of a drawing operation or as source when drawing onto another
surface. To draw to a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>, create a cairo context
with the surface as the target, using <a class="link" href="cairo-cairo-t.html#cairo-create" title="cairo_create ()"><code class="function">cairo_create()</code></a>.</p>
<p>There are different subtypes of <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> for
different drawing backends; for example, <a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create" title="cairo_image_surface_create ()"><code class="function">cairo_image_surface_create()</code></a>
creates a bitmap image in memory.
The type of a surface can be queried with <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-type" title="cairo_surface_get_type ()"><code class="function">cairo_surface_get_type()</code></a>.</p>
<p>The initial contents of a surface after creation depend upon the manner
of its creation. If cairo creates the surface and backing storage for
the user, it will be initially cleared; for example,
<a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create" title="cairo_image_surface_create ()"><code class="function">cairo_image_surface_create()</code></a> and <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-similar" title="cairo_surface_create_similar ()"><code class="function">cairo_surface_create_similar()</code></a>.
Alternatively, if the user passes in a reference to some backing storage
and asks cairo to wrap that in a <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>, then the contents are
not modified; for example, <a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-create-for-data" title="cairo_image_surface_create_for_data ()"><code class="function">cairo_image_surface_create_for_data()</code></a> and
<a class="link" href="cairo-XLib-Surfaces.html#cairo-xlib-surface-create" title="cairo_xlib_surface_create ()"><code class="function">cairo_xlib_surface_create()</code></a>.</p>
<p>Memory management of <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 done with
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-reference" title="cairo_surface_reference ()"><code class="function">cairo_surface_reference()</code></a> and <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a>.</p>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-content-t"></a><h3>enum cairo_content_t</h3>
<p><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> is used to describe the content that a surface will
contain, whether color information, alpha information (translucence
vs. opacity), or both.</p>
<p>Note: The large values here are designed to keep <a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a>
values distinct from <a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> values so that the
implementation can detect the error if users confuse the two types.</p>
<div class="refsect3">
<a name="cairo-content-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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-CONTENT-COLOR:CAPS"></a>CAIRO_CONTENT_COLOR</p></td>
<td class="enum_member_description">
<p>The surface will hold color content only. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-CONTENT-ALPHA:CAPS"></a>CAIRO_CONTENT_ALPHA</p></td>
<td class="enum_member_description">
<p>The surface will hold alpha content only. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-CONTENT-COLOR-ALPHA:CAPS"></a>CAIRO_CONTENT_COLOR_ALPHA</p></td>
<td class="enum_member_description">
<p>The surface will hold color and alpha content. (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-surface-type-t"></a><h3>enum cairo_surface_type_t</h3>
<p><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-type-t" title="enum cairo_surface_type_t"><span class="type">cairo_surface_type_t</span></a> is used to describe the type of a given
surface. The surface types are also known as "backends" or "surface
backends" within cairo.</p>
<p>The type of a surface is determined by the function used to create
it, which will generally be of the form
<code class="function">cairo_<span class="emphasis"><em>type</em></span>_surface_create()</code>,
(though see <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-similar" title="cairo_surface_create_similar ()"><code class="function">cairo_surface_create_similar()</code></a> as well).</p>
<p>The surface type can be queried with <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-get-type" title="cairo_surface_get_type ()"><code class="function">cairo_surface_get_type()</code></a></p>
<p>The various <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> functions can be used with surfaces of
any type, but some backends also provide type-specific functions
that must only be called with a surface of the appropriate
type. These functions have names that begin with
<code class="literal">cairo_<span class="emphasis"><em>type</em></span>_surface</code> such as <a class="link" href="cairo-Image-Surfaces.html#cairo-image-surface-get-width" title="cairo_image_surface_get_width ()"><code class="function">cairo_image_surface_get_width()</code></a>.</p>
<p>The behavior of calling a type-specific function with a surface of
the wrong type is undefined.</p>
<p>New entries may be added in future versions.</p>
<div class="refsect3">
<a name="cairo-surface-type-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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-SURFACE-TYPE-IMAGE:CAPS"></a>CAIRO_SURFACE_TYPE_IMAGE</p></td>
<td class="enum_member_description">
<p>The surface is of type image, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-PDF:CAPS"></a>CAIRO_SURFACE_TYPE_PDF</p></td>
<td class="enum_member_description">
<p>The surface is of type pdf, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-PS:CAPS"></a>CAIRO_SURFACE_TYPE_PS</p></td>
<td class="enum_member_description">
<p>The surface is of type ps, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-XLIB:CAPS"></a>CAIRO_SURFACE_TYPE_XLIB</p></td>
<td class="enum_member_description">
<p>The surface is of type xlib, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-XCB:CAPS"></a>CAIRO_SURFACE_TYPE_XCB</p></td>
<td class="enum_member_description">
<p>The surface is of type xcb, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-GLITZ:CAPS"></a>CAIRO_SURFACE_TYPE_GLITZ</p></td>
<td class="enum_member_description">
<p>The surface is of type glitz, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-QUARTZ:CAPS"></a>CAIRO_SURFACE_TYPE_QUARTZ</p></td>
<td class="enum_member_description">
<p>The surface is of type quartz, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-WIN32:CAPS"></a>CAIRO_SURFACE_TYPE_WIN32</p></td>
<td class="enum_member_description">
<p>The surface is of type win32, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-BEOS:CAPS"></a>CAIRO_SURFACE_TYPE_BEOS</p></td>
<td class="enum_member_description">
<p>The surface is of type beos, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-DIRECTFB:CAPS"></a>CAIRO_SURFACE_TYPE_DIRECTFB</p></td>
<td class="enum_member_description">
<p>The surface is of type directfb, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-SVG:CAPS"></a>CAIRO_SURFACE_TYPE_SVG</p></td>
<td class="enum_member_description">
<p>The surface is of type svg, since 1.2</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-OS2:CAPS"></a>CAIRO_SURFACE_TYPE_OS2</p></td>
<td class="enum_member_description">
<p>The surface is of type os2, since 1.4</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-WIN32-PRINTING:CAPS"></a>CAIRO_SURFACE_TYPE_WIN32_PRINTING</p></td>
<td class="enum_member_description">
<p>The surface is a win32 printing surface, since 1.6</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-QUARTZ-IMAGE:CAPS"></a>CAIRO_SURFACE_TYPE_QUARTZ_IMAGE</p></td>
<td class="enum_member_description">
<p>The surface is of type quartz_image, since 1.6</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-SCRIPT:CAPS"></a>CAIRO_SURFACE_TYPE_SCRIPT</p></td>
<td class="enum_member_description">
<p>The surface is of type script, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-QT:CAPS"></a>CAIRO_SURFACE_TYPE_QT</p></td>
<td class="enum_member_description">
<p>The surface is of type Qt, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-RECORDING:CAPS"></a>CAIRO_SURFACE_TYPE_RECORDING</p></td>
<td class="enum_member_description">
<p>The surface is of type recording, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-VG:CAPS"></a>CAIRO_SURFACE_TYPE_VG</p></td>
<td class="enum_member_description">
<p>The surface is a OpenVG surface, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-GL:CAPS"></a>CAIRO_SURFACE_TYPE_GL</p></td>
<td class="enum_member_description">
<p>The surface is of type OpenGL, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-DRM:CAPS"></a>CAIRO_SURFACE_TYPE_DRM</p></td>
<td class="enum_member_description">
<p>The surface is of type Direct Render Manager, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-TEE:CAPS"></a>CAIRO_SURFACE_TYPE_TEE</p></td>
<td class="enum_member_description">
<p>The surface is of type 'tee' (a multiplexing surface), since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-XML:CAPS"></a>CAIRO_SURFACE_TYPE_XML</p></td>
<td class="enum_member_description">
<p>The surface is of type XML (for debugging), since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-SKIA:CAPS"></a>CAIRO_SURFACE_TYPE_SKIA</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-SUBSURFACE:CAPS"></a>CAIRO_SURFACE_TYPE_SUBSURFACE</p></td>
<td class="enum_member_description">
<p>The surface is a subsurface created with
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-create-for-rectangle" title="cairo_surface_create_for_rectangle ()"><code class="function">cairo_surface_create_for_rectangle()</code></a>, since 1.10</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SURFACE-TYPE-COGL:CAPS"></a>CAIRO_SURFACE_TYPE_COGL</p></td>
<td class="enum_member_description">
<p>This surface is of type Cogl, since 1.12</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-cairo-surface-t.see-also"></a><h2>See Also</h2>
<p><a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>, <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-t" title="cairo_pattern_t"><span class="type">cairo_pattern_t</span></a></p>
</div>
</div>
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