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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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 | 
<a href="#id2641510" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="cairo-cairo-font-face-t"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2>
<a name="id2596918"></a><span class="refentrytitle">cairo_font_face_t</span>
</h2>
<p>cairo_font_face_t — Base class for font faces</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">
typedef <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a>;
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a>* <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-reference">cairo_font_face_reference</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);
void <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-destroy">cairo_font_face_destroy</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);
<a class="link" href="cairo-Error-Handling.html#cairo-status-t">cairo_status_t</a> <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-status">cairo_font_face_status</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);
enum <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-type-t">cairo_font_type_t</a>;
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-type-t">cairo_font_type_t</a> <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-type">cairo_font_face_get_type</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);
unsigned int <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-reference-count">cairo_font_face_get_reference_count</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);
<a class="link" href="cairo-Error-Handling.html#cairo-status-t">cairo_status_t</a> <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-set-user-data">cairo_font_face_set_user_data</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face,
const <a class="link" href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a> *key,
void *user_data,
<a class="link" href="cairo-Types.html#cairo-destroy-func-t">cairo_destroy_func_t</a> destroy);
void* <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-user-data">cairo_font_face_get_user_data</a> (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face,
const <a class="link" href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a> *key);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="id2641510"></a><h2>Description</h2>
<p>
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a> represents a particular font at a particular weight,
slant, and other characteristic but no size, transformation, or size.
</p>
<p>
Font faces are created using <em class="firstterm">font-backend</em>-specific
constructors, typically of the form
cairo_<span class="emphasis"><em>backend</em></span><code class="function">_font_face_create()</code>,
or implicitly using the <em class="firstterm">toy</em> text API by way of
<a class="link" href="cairo-Text.html#cairo-select-font-face"><code class="function">cairo_select_font_face()</code></a>. The resulting face can be accessed using
<a class="link" href="cairo-Text.html#cairo-get-font-face"><code class="function">cairo_get_font_face()</code></a>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2589144"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="id2589155"></a><h3>
<a name="cairo-font-face-t"></a>cairo_font_face_t</h3>
<a class="indexterm" name="id2589167"></a><pre class="programlisting">typedef struct _cairo_font_face cairo_font_face_t;
</pre>
<p>
A <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a> specifies all aspects of a font other
than the size or font matrix (a font matrix is used to distort
a font by sheering it or scaling it unequally in the two
directions) . A font face can be set on a <a class="link" href="cairo-cairo-t.html#cairo-t"><span class="type">cairo_t</span></a> by using
<a class="link" href="cairo-Text.html#cairo-set-font-face"><code class="function">cairo_set_font_face()</code></a>; the size and font matrix are set with
<a class="link" href="cairo-Text.html#cairo-set-font-size"><code class="function">cairo_set_font_size()</code></a> and <a class="link" href="cairo-Text.html#cairo-set-font-matrix"><code class="function">cairo_set_font_matrix()</code></a>.
</p>
<p>
There are various types of font faces, depending on the
<em class="firstterm">font backend</em> they use. The type of a
font face can be queried using <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-type"><code class="function">cairo_font_face_get_type()</code></a>.
</p>
<p>
Memory management of <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a> is done with
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-reference"><code class="function">cairo_font_face_reference()</code></a> and <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-destroy"><code class="function">cairo_font_face_destroy()</code></a>.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2641917"></a><h3>
<a name="cairo-font-face-reference"></a>cairo_font_face_reference ()</h3>
<a class="indexterm" name="id2641928"></a><pre class="programlisting"><a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a>* cairo_font_face_reference (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);</pre>
<p>
Increases the reference count on <em class="parameter"><code>font_face</code></em> by one. This prevents
<em class="parameter"><code>font_face</code></em> from being destroyed until a matching call to
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-destroy"><code class="function">cairo_font_face_destroy()</code></a> is made.
</p>
<p>
The number of references to a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a> can be get using
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-reference-count"><code class="function">cairo_font_face_get_reference_count()</code></a>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>, (may be <code class="literal">NULL</code> in which case this
function does nothing).
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the referenced <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2640645"></a><h3>
<a name="cairo-font-face-destroy"></a>cairo_font_face_destroy ()</h3>
<a class="indexterm" name="id2640656"></a><pre class="programlisting">void cairo_font_face_destroy (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);</pre>
<p>
Decreases the reference count on <em class="parameter"><code>font_face</code></em> by one. If the result
is zero, then <em class="parameter"><code>font_face</code></em> and all associated resources are freed.
See <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-reference"><code class="function">cairo_font_face_reference()</code></a>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2640734"></a><h3>
<a name="cairo-font-face-status"></a>cairo_font_face_status ()</h3>
<a class="indexterm" name="id2640745"></a><pre class="programlisting"><a class="link" href="cairo-Error-Handling.html#cairo-status-t">cairo_status_t</a> cairo_font_face_status (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);</pre>
<p>
Checks whether an error has previously occurred for this
font face</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <a class="link" href="cairo-Error-Handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> or another error such as
<a class="link" href="cairo-Error-Handling.html#CAIRO-STATUS-NO-MEMORY:CAPS"><code class="literal">CAIRO_STATUS_NO_MEMORY</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2640830"></a><h3>
<a name="cairo-font-type-t"></a>enum cairo_font_type_t</h3>
<a class="indexterm" name="id2640845"></a><pre class="programlisting">typedef enum _cairo_font_type {
CAIRO_FONT_TYPE_TOY,
CAIRO_FONT_TYPE_FT,
CAIRO_FONT_TYPE_WIN32,
CAIRO_FONT_TYPE_ATSUI
} cairo_font_type_t;
</pre>
<p>
<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-type-t"><span class="type">cairo_font_type_t</span></a> is used to describe the type of a given font
face or scaled font. The font types are also known as "font
backends" within cairo.
</p>
<p>
The type of a font face is determined by the function used to
create it, which will generally be of the form
cairo_<span class="emphasis"><em>type</em></span>_font_face_create. The font face type can be queried
with <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-get-type"><code class="function">cairo_font_face_get_type()</code></a>
</p>
<p>
The various <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a> functions can be used with a font face
of any type.
</p>
<p>
The type of a scaled font is determined by the type of the font
face passed to <a class="link" href="cairo-Scaled-Fonts.html#cairo-scaled-font-create"><code class="function">cairo_scaled_font_create()</code></a>. The scaled font type can
be queried with <a class="link" href="cairo-Scaled-Fonts.html#cairo-scaled-font-get-type"><code class="function">cairo_scaled_font_get_type()</code></a>
</p>
<p>
The various <a class="link" href="cairo-Scaled-Fonts.html#cairo-scaled-font-t"><span class="type">cairo_scaled_font_t</span></a> functions can be used with scaled
fonts of any type, but some font backends also provide
type-specific functions that must only be called with a scaled font
of the appropriate type. These functions have names that begin with
cairo_<span class="emphasis"><em>type</em></span>_scaled_font such as <a class="link" href="cairo-FreeType-Fonts.html#cairo-ft-scaled-font-lock-face"><code class="function">cairo_ft_scaled_font_lock_face()</code></a>.
</p>
<p>
The behavior of calling a type-specific function with a scaled font
of the wrong type is undefined.
</p>
<p>
New entries may be added in future versions.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a name="CAIRO-FONT-TYPE-TOY:CAPS"></a><code class="literal">CAIRO_FONT_TYPE_TOY</code></span></p></td>
<td> The font was created using cairo's toy font api
</td>
</tr>
<tr>
<td><p><span class="term"><a name="CAIRO-FONT-TYPE-FT:CAPS"></a><code class="literal">CAIRO_FONT_TYPE_FT</code></span></p></td>
<td> The font is of type FreeType
</td>
</tr>
<tr>
<td><p><span class="term"><a name="CAIRO-FONT-TYPE-WIN32:CAPS"></a><code class="literal">CAIRO_FONT_TYPE_WIN32</code></span></p></td>
<td> The font is of type Win32
</td>
</tr>
<tr>
<td><p><span class="term"><a name="CAIRO-FONT-TYPE-ATSUI:CAPS"></a><code class="literal">CAIRO_FONT_TYPE_ATSUI</code></span></p></td>
<td> The font is of type ATSUI
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2577309"></a><h3>
<a name="cairo-font-face-get-type"></a>cairo_font_face_get_type ()</h3>
<a class="indexterm" name="id2577323"></a><pre class="programlisting"><a class="link" href="cairo-cairo-font-face-t.html#cairo-font-type-t">cairo_font_type_t</a> cairo_font_face_get_type (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);</pre>
<p>
This function returns the type of the backend used to create
a font face. See <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-type-t"><span class="type">cairo_font_type_t</span></a> for available types.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a font face
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> The type of <em class="parameter"><code>font_face</code></em>.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2577404"></a><h3>
<a name="cairo-font-face-get-reference-count"></a>cairo_font_face_get_reference_count ()</h3>
<a class="indexterm" name="id2577419"></a><pre class="programlisting">unsigned int cairo_font_face_get_reference_count (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face);</pre>
<p>
Returns the current reference count of <em class="parameter"><code>font_face</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current reference count of <em class="parameter"><code>font_face</code></em>. If the
object is a nil object, 0 will be returned.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2577509"></a><h3>
<a name="cairo-font-face-set-user-data"></a>cairo_font_face_set_user_data ()</h3>
<a class="indexterm" name="id2577522"></a><pre class="programlisting"><a class="link" href="cairo-Error-Handling.html#cairo-status-t">cairo_status_t</a> cairo_font_face_set_user_data (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face,
const <a class="link" href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a> *key,
void *user_data,
<a class="link" href="cairo-Types.html#cairo-destroy-func-t">cairo_destroy_func_t</a> destroy);</pre>
<p>
Attach user data to <em class="parameter"><code>font_face</code></em>. To remove user data from a font face,
call this function with the key that was used to set it and <code class="literal">NULL</code>
for <em class="parameter"><code>data</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td> the address of a <a class="link" href="cairo-Types.html#cairo-user-data-key-t"><span class="type">cairo_user_data_key_t</span></a> to attach the user data to
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td> the user data to attach to the font face
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-Types.html#cairo-destroy-func-t"><span class="type">cairo_destroy_func_t</span></a> which will be called when the
font face is destroyed or when new user data is attached using the
same key.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <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.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2626648"></a><h3>
<a name="cairo-font-face-get-user-data"></a>cairo_font_face_get_user_data ()</h3>
<a class="indexterm" name="id2626661"></a><pre class="programlisting">void* cairo_font_face_get_user_data (<a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t">cairo_font_face_t</a> *font_face,
const <a class="link" href="cairo-Types.html#cairo-user-data-key-t">cairo_user_data_key_t</a> *key);</pre>
<p>
Return user data previously attached to <em class="parameter"><code>font_face</code></em> using the specified
key. If no user data has been attached with the given key this
function returns <code class="literal">NULL</code>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>font_face</code></em> :</span></p></td>
<td> a <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-t"><span class="type">cairo_font_face_t</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td> the address of the <a class="link" href="cairo-Types.html#cairo-user-data-key-t"><span class="type">cairo_user_data_key_t</span></a> the user data was
attached to
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the user data previously attached or <code class="literal">NULL</code>.
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" lang="en">
<a name="id2626786"></a><h2>See Also</h2>
<p>
</p>
<div class="itemizedlist"><ul type="disc"><li><a class="link" href="cairo-Scaled-Fonts.html#cairo-scaled-font-t"><span class="type">cairo_scaled_font_t</span></a></li></ul></div>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2626809"></a><div class="refsect2" lang="en"><a name="id2626810"></a></div>
<hr>
<div class="refsect2" lang="en"><a name="id2626812"></a></div>
</div>
</div>
</body>
</html>
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