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<title>Sub Textures: Cogl 2.0 Reference Manual</title>
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<a href="#cogl-2.0-experimental-Sub-Textures.description" class="shortcut">Description</a></span>
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<a name="cogl-2.0-experimental-Sub-Textures"></a><div class="titlepage"></div>
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<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-Sub-Textures.top_of_page"></a>Sub Textures</span></h2>
<p>Sub Textures — Functions for creating and manipulating
sub-textures.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sub-Textures.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="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="returnvalue">CoglSubTexture</span></a> *
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Sub-Textures.html#cogl-sub-texture-new" title="cogl_sub_texture_new ()">cogl_sub_texture_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Sub-Textures.html#cogl-is-sub-texture" title="cogl_is_sub_texture ()">cogl_is_sub_texture</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sub-Textures.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="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture">CoglSubTexture</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sub-Textures.description"></a><h2>Description</h2>
<p>These functions allow high-level textures to be created that
represent a sub-region of another texture. For example these
can be used to implement custom texture atlasing schemes.</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sub-Textures.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-sub-texture-new"></a><h3>cogl_sub_texture_new ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="returnvalue">CoglSubTexture</span></a> *
cogl_sub_texture_new (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a> *parent_texture</code></em>,
<em class="parameter"><code><span class="type">int</span> sub_x</code></em>,
<em class="parameter"><code><span class="type">int</span> sub_y</code></em>,
<em class="parameter"><code><span class="type">int</span> sub_width</code></em>,
<em class="parameter"><code><span class="type">int</span> sub_height</code></em>);</pre>
<p>Creates a high-level <a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a> representing a sub-region of
any other <a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a>. The sub-region must strictly lye within the
bounds of the <em class="parameter"><code>parent_texture</code></em>
. The returned texture implements the
<a class="link" href="cogl-2.0-experimental-High-Level-Meta-Textures.html#CoglMetaTexture" title="CoglMetaTexture"><span class="type">CoglMetaTexture</span></a> interface because it's not a low level texture
that hardware can understand natively.</p>
<div class="note">Remember: Unless you are using high level drawing APIs such
as <a class="link" href="cogl-2.0-experimental-Rectangles.html#cogl-rectangle" title="cogl_rectangle ()"><code class="function">cogl_rectangle()</code></a> or other APIs documented to understand the
<a class="link" href="cogl-2.0-experimental-High-Level-Meta-Textures.html#CoglMetaTexture" title="CoglMetaTexture"><span class="type">CoglMetaTexture</span></a> interface then you need to use the
<a class="link" href="cogl-2.0-experimental-High-Level-Meta-Textures.html#CoglMetaTexture" title="CoglMetaTexture"><span class="type">CoglMetaTexture</span></a> interface to resolve a <a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a> into a
low-level texture before drawing.</div>
<div class="refsect3">
<a name="cogl-sub-texture-new.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>ctx</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> pointer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>parent_texture</p></td>
<td class="parameter_description"><p>The full texture containing a sub-region you want
to make a <a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a> from.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sub_x</p></td>
<td class="parameter_description"><p>The top-left x coordinate of the parent region to make
a texture from.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sub_y</p></td>
<td class="parameter_description"><p>The top-left y coordinate of the parent region to make
a texture from.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sub_width</p></td>
<td class="parameter_description"><p>The width of the parent region to make a texture from.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sub_height</p></td>
<td class="parameter_description"><p>The height of the parent region to make a texture
from.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-sub-texture-new.returns"></a><h4>Returns</h4>
<p> A newly allocated <a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a>
representing a sub-region of <em class="parameter"><code>parent_texture</code></em>
. </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: 1.10</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-sub-texture"></a><h3>cogl_is_sub_texture ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a>
cogl_is_sub_texture (<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-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a>.</p>
<div class="refsect3">
<a name="cogl-is-sub-texture.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>object</p></td>
<td class="parameter_description"><p>a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-is-sub-texture.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the passed <em class="parameter"><code>object</code></em>
represents a
<a class="link" href="cogl-2.0-experimental-Sub-Textures.html#CoglSubTexture" title="CoglSubTexture"><span class="type">CoglSubTexture</span></a> and <code class="literal">FALSE</code> otherwise.</p>
</div>
<p class="since">Since: 1.10</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sub-Textures.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglSubTexture"></a><h3>CoglSubTexture</h3>
<pre class="programlisting">typedef struct _CoglSubTexture CoglSubTexture;</pre>
</div>
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