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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</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<th width="100%" align="center">Cairo: A Vector Graphics Library</th>
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<tr><td colspan="5" class="shortcuts">
<a href="#cairo-SVG-Surfaces.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#cairo-SVG-Surfaces.description" class="shortcut">Description</a>
</td></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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="cairo-SVG-Surfaces.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define             <a class="link" href="cairo-SVG-Surfaces.html#CAIRO-HAS-SVG-SURFACE:CAPS" title="CAIRO_HAS_SVG_SURFACE">CAIRO_HAS_SVG_SURFACE</a>
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *   <a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-surface-create" title="cairo_svg_surface_create ()">cairo_svg_surface_create</a>            (<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>);
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> *   <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> (<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>);
<span class="returnvalue">void</span>                <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>
                                                        (<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>);
enum                <a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-version-t" title="enum cairo_svg_version_t">cairo_svg_version_t</a>;
<span class="returnvalue">void</span>                <a class="link" href="cairo-SVG-Surfaces.html#cairo-svg-get-versions" title="cairo_svg_get_versions ()">cairo_svg_get_versions</a>              (<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>);
const <span class="returnvalue">char</span> *        <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>         (<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>
</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.details"></a><h2>Details</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-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>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>a filename for the SVG output (must be writable), <a href="http://library.gnome.org/devel/glib/unstable/glib-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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width_in_points</code></em> :</span></p></td>
<td>width of the surface, in points (1 point == 1/72.0 inch)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height_in_points</code></em> :</span></p></td>
<td>height of the surface, in points (1 point == 1/72.0 inch)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.
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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>write_func</code></em> :</span></p></td>
<td>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="http://library.gnome.org/devel/glib/unstable/glib-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.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>closure</code></em> :</span></p></td>
<td>the closure argument for <em class="parameter"><code>write_func</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width_in_points</code></em> :</span></p></td>
<td>width of the surface, in points (1 point == 1/72.0 inch)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height_in_points</code></em> :</span></p></td>
<td>height of the surface, in points (1 point == 1/72.0 inch)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.
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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>surface</code></em> :</span></p></td>
<td>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>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>version</code></em> :</span></p></td>
<td>SVG version</td>
</tr>
</tbody>
</table></div>
<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>
<pre class="programlisting">typedef enum {
    CAIRO_SVG_VERSION_1_1,
    CAIRO_SVG_VERSION_1_2
} cairo_svg_version_t;
</pre>
<p>
<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> is used to describe the version number of the SVG
specification that a generated SVG file will conform to.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="CAIRO-SVG-VERSION-1-1:CAPS"></a><span class="term"><code class="literal">CAIRO_SVG_VERSION_1_1</code></span></p></td>
<td>The version 1.1 of the SVG specification. (Since 1.2)
</td>
</tr>
<tr>
<td><p><a name="CAIRO-SVG-VERSION-1-2:CAPS"></a><span class="term"><code class="literal">CAIRO_SVG_VERSION_1_2</code></span></p></td>
<td>The version 1.2 of the SVG specification. (Since 1.2)
</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>versions</code></em> :</span></p></td>
<td>supported version list</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num_versions</code></em> :</span></p></td>
<td>list length</td>
</tr>
</tbody>
</table></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="http://library.gnome.org/devel/glib/unstable/glib-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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>version</code></em> :</span></p></td>
<td>a version id</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the string associated to given version.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
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<div class="refsect1">
<a name="cairo-SVG-Surfaces.see-also"></a><h2>See Also</h2>
<a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a>
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