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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>SVG Surfaces: Cairo: A Vector Graphics Library</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="Cairo: A Vector Graphics Library">
<link rel="up" href="cairo-surfaces.html" title="Surfaces">
<link rel="prev" href="cairo-Win32-Surfaces.html" title="Win32 Surfaces">
<link rel="next" href="cairo-Quartz-Surfaces.html" title="Quartz Surfaces">
<meta name="generator" content="GTK-Doc V1.25 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#cairo-SVG-Surfaces.description" class="shortcut">Description</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="cairo-surfaces.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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</tr></table>
<div class="refentry">
<a name="cairo-SVG-Surfaces"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-SVG-Surfaces.top_of_page"></a>SVG Surfaces</span></h2>
<p>SVG Surfaces — Rendering SVG documents</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.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-SVG-Surfaces.html#cairo-svg-surface-create" title="cairo_svg_surface_create ()">cairo_svg_surface_create</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-surface-create-for-stream" title="cairo_svg_surface_create_for_stream ()">cairo_svg_surface_create_for_stream</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-SVG-Surfaces.html#cairo-svg-surface-restrict-to-version" title="cairo_svg_surface_restrict_to_version ()">cairo_svg_surface_restrict_to_version</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-SVG-Surfaces.html#cairo-svg-get-versions" title="cairo_svg_get_versions ()">cairo_svg_get_versions</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-version-to-string" title="cairo_svg_version_to_string ()">cairo_svg_version_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.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-SVG-Surfaces.html#CAIRO-HAS-SVG-SURFACE:CAPS" title="CAIRO_HAS_SVG_SURFACE">CAIRO_HAS_SVG_SURFACE</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-version-t" title="enum cairo_svg_version_t">cairo_svg_version_t</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.description"></a><h2>Description</h2>
<p>The SVG surface is used to render cairo graphics to
SVG files and is a multi-page vector surface backend.</p>
</div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cairo-svg-surface-create"></a><h3>cairo_svg_surface_create ()</h3>
<pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *
cairo_svg_surface_create (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                          <em class="parameter"><code><span class="type">double</span> width_in_points</code></em>,
                          <em class="parameter"><code><span class="type">double</span> height_in_points</code></em>);</pre>
<p>Creates a SVG surface of the specified size in points to be written
to <em class="parameter"><code>filename</code></em>
.</p>
<p>The SVG surface backend recognizes the following MIME types for the
data attached to a surface (see <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-set-mime-data" title="cairo_surface_set_mime_data ()"><code class="function">cairo_surface_set_mime_data()</code></a>) when
it is used as a source pattern for drawing on this surface:
<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-URI:CAPS" title="CAIRO_MIME_TYPE_URI"><code class="literal">CAIRO_MIME_TYPE_URI</code></a>. If any of them is specified, the SVG backend
emits a href with the content of MIME data instead of a surface
snapshot (PNG, Base64-encoded) in the corresponding image tag.</p>
<p>The unofficial MIME type <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> is examined
first. If present, the URI is emitted as is: assuring the
correctness of URI is left to the client code.</p>
<p>If <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> is not present, but <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>
or <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> is specified, the corresponding data is
Base64-encoded and emitted.</p>
<p>If <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> is present, all surfaces with the same
unique identifier will only be embedded once.</p>
<div class="refsect3">
<a name="cairo-svg-surface-create.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>filename</p></td>
<td class="parameter_description"><p>a filename for the SVG output (must be writable), <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> may be
used to specify no output. This will generate a SVG surface that
may be queried and used as a source, without generating a
temporary file.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width_in_points</p></td>
<td class="parameter_description"><p>width of the surface, in points (1 point == 1/72.0 inch)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height_in_points</p></td>
<td class="parameter_description"><p>height of the surface, in points (1 point == 1/72.0 inch)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-svg-surface-create.returns"></a><h4>Returns</h4>
<p> a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.</p>
<p>This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-svg-surface-create-for-stream"></a><h3>cairo_svg_surface_create_for_stream ()</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_svg_surface_create_for_stream (<em class="parameter"><code><a class="link" href="cairo-PNG-Support.html#cairo-write-func-t" title="cairo_write_func_t ()"><span class="type">cairo_write_func_t</span></a> write_func</code></em>,
                                     <em class="parameter"><code><span class="type">void</span> *closure</code></em>,
                                     <em class="parameter"><code><span class="type">double</span> width_in_points</code></em>,
                                     <em class="parameter"><code><span class="type">double</span> height_in_points</code></em>);</pre>
<p>Creates a SVG surface of the specified size in points to be written
incrementally to the stream represented by <em class="parameter"><code>write_func</code></em>
 and <em class="parameter"><code>closure</code></em>
.</p>
<div class="refsect3">
<a name="cairo-svg-surface-create-for-stream.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>write_func</p></td>
<td class="parameter_description"><p>a <a class="link" href="cairo-PNG-Support.html#cairo-write-func-t" title="cairo_write_func_t ()"><span class="type">cairo_write_func_t</span></a> to accept the output data, may be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
to indicate a no-op <em class="parameter"><code>write_func</code></em>
. With a no-op <em class="parameter"><code>write_func</code></em>
,
the surface may be queried or used as a source without
generating any temporary files.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>closure</p></td>
<td class="parameter_description"><p>the closure argument for <em class="parameter"><code>write_func</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width_in_points</p></td>
<td class="parameter_description"><p>width of the surface, in points (1 point == 1/72.0 inch)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height_in_points</p></td>
<td class="parameter_description"><p>height of the surface, in points (1 point == 1/72.0 inch)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-svg-surface-create-for-stream.returns"></a><h4>Returns</h4>
<p> a pointer to the newly created surface. The caller
owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done
with it.</p>
<p>This function always returns a valid pointer, but it will return a
pointer to a "nil" surface if an error such as out of memory
occurs. You can use <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a> to check for this.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-svg-surface-restrict-to-version"></a><h3>cairo_svg_surface_restrict_to_version ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_svg_surface_restrict_to_version (<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-SVG-Surfaces.html#cairo-svg-version-t" title="enum cairo_svg_version_t"><span class="type">cairo_svg_version_t</span></a> version</code></em>);</pre>
<p>Restricts the generated SVG file to <em class="parameter"><code>version</code></em>
. See <a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-get-versions" title="cairo_svg_get_versions ()"><code class="function">cairo_svg_get_versions()</code></a>
for a list of available version values that can be used here.</p>
<p>This function should only be called before any drawing operations
have been performed on the given surface. The simplest way to do
this is to call this function immediately after creating the
surface.</p>
<div class="refsect3">
<a name="cairo-svg-surface-restrict-to-version.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 SVG <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>version</p></td>
<td class="parameter_description"><p>SVG version</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-svg-get-versions"></a><h3>cairo_svg_get_versions ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_svg_get_versions (<em class="parameter"><code><a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-version-t" title="enum cairo_svg_version_t"><span class="type">cairo_svg_version_t</span></a> const **versions</code></em>,
                        <em class="parameter"><code><span class="type">int</span> *num_versions</code></em>);</pre>
<p>Used to retrieve the list of supported versions. See
<a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-surface-restrict-to-version" title="cairo_svg_surface_restrict_to_version ()"><code class="function">cairo_svg_surface_restrict_to_version()</code></a>.</p>
<div class="refsect3">
<a name="cairo-svg-get-versions.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>versions</p></td>
<td class="parameter_description"><p>supported version list</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>num_versions</p></td>
<td class="parameter_description"><p>list length</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-svg-version-to-string"></a><h3>cairo_svg_version_to_string ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
cairo_svg_version_to_string (<em class="parameter"><code><a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-version-t" title="enum cairo_svg_version_t"><span class="type">cairo_svg_version_t</span></a> version</code></em>);</pre>
<p>Get the string representation of the given <em class="parameter"><code>version</code></em>
 id. This function
will return <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if <em class="parameter"><code>version</code></em>
 isn't valid. See <a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-get-versions" title="cairo_svg_get_versions ()"><code class="function">cairo_svg_get_versions()</code></a>
for a way to get the list of valid version ids.</p>
<div class="refsect3">
<a name="cairo-svg-version-to-string.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>version</p></td>
<td class="parameter_description"><p>a version id</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-svg-version-to-string.returns"></a><h4>Returns</h4>
<p> the string associated to given version.</p>
</div>
<p class="since">Since: 1.2</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CAIRO-HAS-SVG-SURFACE:CAPS"></a><h3>CAIRO_HAS_SVG_SURFACE</h3>
<pre class="programlisting">#define CAIRO_HAS_SVG_SURFACE 1
</pre>
<p>Defined if the SVG surface backend is available.
This macro can be used to conditionally compile backend-specific code.</p>
<p class="since">Since: 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-svg-version-t"></a><h3>enum cairo_svg_version_t</h3>
<p><em class="parameter"><code>CAIRO_SVG_UNIT_USER</code></em>
: User unit, a value in the current coordinate system.
  If used in the root element for the initial coordinate systems it
  corresponds to pixels. (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_EM</code></em>
: The size of the element's font. (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_EX</code></em>
: The x-height of the element’s font. (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_PX</code></em>
: Pixels (1px = 1/96th of 1in). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_IN</code></em>
: Inches (1in = 2.54cm = 96px). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_CM</code></em>
: Centimeters (1cm = 96px/2.54). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_MM</code></em>
: Millimeters (1mm = 1/10th of 1cm). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_PT</code></em>
: Points (1pt = 1/72th of 1in). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_PC</code></em>
: Picas (1pc = 1/6th of 1in). (Since 1.16)
<em class="parameter"><code>CAIRO_SVG_UNIT_PERCENT</code></em>
: Percent, a value that is some fraction of another
  reference value. (Since 1.16)</p>
<p><span class="type">cairo_svg_unit_t</span> is used to describe the units valid for coordinates and
lengths in the SVG specification.</p>
<p>See also:
https://www.w3.org/TR/SVG/coords.html<span class="type">Units</span>
https://www.w3.org/TR/SVG/types.html<span class="type">DataTypeLength</span>
https://www.w3.org/TR/css-values-3/<span class="type">lengths</span></p>
<div class="refsect3">
<a name="cairo-svg-version-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-SVG-VERSION-1-1:CAPS"></a>CAIRO_SVG_VERSION_1_1</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-SVG-VERSION-1-2:CAPS"></a>CAIRO_SVG_VERSION_1_2</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.16</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-SVG-Surfaces.see-also"></a><h2>See Also</h2>
<p><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a></p>
</div>
</div>
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