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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>Cogl Reference Manual: Bitmaps</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#cogl-Bitmaps.description" class="shortcut">Description</a></span>
</td>
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</tr></table>
<div class="refentry">
<a name="cogl-Bitmaps"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-Bitmaps.top_of_page"></a>Bitmaps</span></h2>
<p>Bitmaps — Functions for loading images</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-Bitmaps.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap"><span class="returnvalue">CoglBitmap</span></a> *
</td>
<td class="function_name">
<a class="link" href="cogl-Bitmaps.html#cogl-bitmap-new-from-file" title="cogl_bitmap_new_from_file ()">cogl_bitmap_new_from_file</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Bitmaps.html#cogl-bitmap-get-size-from-file" title="cogl_bitmap_get_size_from_file ()">cogl_bitmap_get_size_from_file</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Bitmaps.html#cogl-is-bitmap" title="cogl_is_bitmap ()">cogl_is_bitmap</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="cogl-Bitmaps.html#COGL-BITMAP-ERROR:CAPS" title="COGL_BITMAP_ERROR">COGL_BITMAP_ERROR</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-Bitmaps.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap">CoglBitmap</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cogl-Bitmaps.html#CoglBitmapError" title="enum CoglBitmapError">CoglBitmapError</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-Bitmaps.description"></a><h2>Description</h2>
<p>Cogl allows loading image data into memory as CoglBitmaps without
loading them immediately into GPU textures.</p>
<p><a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a> is available since Cogl 1.0</p>
</div>
<div class="refsect1">
<a name="cogl-Bitmaps.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-bitmap-new-from-file"></a><h3>cogl_bitmap_new_from_file ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap"><span class="returnvalue">CoglBitmap</span></a> *
cogl_bitmap_new_from_file (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                           <em class="parameter"><code><span class="type">CoglError</span> **error</code></em>);</pre>
<p>Loads an image file from disk. This function can be safely called from
within a thread.</p>
<div class="refsect3">
<a name="id-1.2.15.6.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>the file to load.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a <span class="type">CoglError</span> or <code class="literal">NULL</code>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.6.2.6"></a><h4>Returns</h4>
<p> a <a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a> to the new loaded
image data, or <code class="literal">NULL</code> if loading the image failed. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-bitmap-get-size-from-file"></a><h3>cogl_bitmap_get_size_from_file ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_bitmap_get_size_from_file (<em class="parameter"><code>const <span class="type">char</span> *filename</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>Parses an image file enough to extract the width and height
of the bitmap.</p>
<div class="refsect3">
<a name="id-1.2.15.6.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>the file to check</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p> return location for the bitmap width, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p> return location for the bitmap height, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.6.3.6"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the image was successfully parsed</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-bitmap"></a><h3>cogl_is_bitmap ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_is_bitmap (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>Checks whether <em class="parameter"><code>object</code></em>
 is a <a class="link" href="cogl-Bitmaps.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a></p>
<div class="refsect3">
<a name="id-1.2.15.6.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>a <a class="link" href="cogl-General-API.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> pointer</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.15.6.4.6"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the passed <em class="parameter"><code>object</code></em>
represents a bitmap,
and <code class="literal">FALSE</code> otherwise</p>
<p></p>
</div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="COGL-BITMAP-ERROR:CAPS"></a><h3>COGL_BITMAP_ERROR</h3>
<pre class="programlisting">#define COGL_BITMAP_ERROR (cogl_bitmap_error_quark ())
</pre>
<p><span class="type">CoglError</span> domain for bitmap errors.</p>
<p class="since">Since 1.4</p>
</div>
</div>
<div class="refsect1">
<a name="cogl-Bitmaps.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglBitmap"></a><h3>CoglBitmap</h3>
<pre class="programlisting">typedef struct _CoglBitmap CoglBitmap;</pre>
</div>
<hr>
<div class="refsect2">
<a name="CoglBitmapError"></a><h3>enum CoglBitmapError</h3>
<p>Error codes that can be thrown when performing bitmap
operations. Note that <code class="function">gdk_pixbuf_new_from_file()</code> can also throw
errors directly from the underlying image loading library. For
example, if GdkPixbuf is used then errors <span class="type">GdkPixbufError</span>s
will be used directly.</p>
<div class="refsect3">
<a name="id-1.2.15.7.3.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="COGL-BITMAP-ERROR-FAILED:CAPS"></a>COGL_BITMAP_ERROR_FAILED</p></td>
<td class="enum_member_description">
<p>Generic failure code, something went
  wrong.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BITMAP-ERROR-UNKNOWN-TYPE:CAPS"></a>COGL_BITMAP_ERROR_UNKNOWN_TYPE</p></td>
<td class="enum_member_description">
<p>Unknown image type.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BITMAP-ERROR-CORRUPT-IMAGE:CAPS"></a>COGL_BITMAP_ERROR_CORRUPT_IMAGE</p></td>
<td class="enum_member_description">
<p>An image file was broken somehow.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.4</p>
</div>
</div>
</div>
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