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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>Pixbufs: GDK 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GDK 3 Reference Manual"> <link rel="up" href="reference.html" title="API Reference"> <link rel="prev" href="gdk3-Points-Rectangles-and-Regions.html" title="Points and Rectangles"> <link rel="next" href="gdk3-RGBA-Colors.html" title="RGBA Colors"> <meta name="generator" content="GTK-Doc V1.32 (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="#gdk3-Pixbufs.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="reference.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="gdk3-Points-Rectangles-and-Regions.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="gdk3-RGBA-Colors.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="gdk3-Pixbufs"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="gdk3-Pixbufs.top_of_page"></a>Pixbufs</span></h2> <p>Pixbufs — Functions for obtaining pixbufs</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="gdk3-Pixbufs.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <span class="returnvalue">GdkPixbuf</span> * </td> <td class="function_name"> <a class="link" href="gdk3-Pixbufs.html#gdk-pixbuf-get-from-window" title="gdk_pixbuf_get_from_window ()">gdk_pixbuf_get_from_window</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">GdkPixbuf</span> * </td> <td class="function_name"> <a class="link" href="gdk3-Pixbufs.html#gdk-pixbuf-get-from-surface" title="gdk_pixbuf_get_from_surface ()">gdk_pixbuf_get_from_surface</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="gdk3-Pixbufs.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gdk/gdk.h> </pre> </div> <div class="refsect1"> <a name="gdk3-Pixbufs.description"></a><h2>Description</h2> <p>Pixbufs are client-side images. For details on how to create and manipulate pixbufs, see the <span class="type">GdkPixbuf</span> API documentation.</p> <p>The functions described here allow to obtain pixbufs from <a href="gdk3-Windows.html#GdkWindow-struct"><span class="type">GdkWindows</span></a> and cairo surfaces.</p> </div> <div class="refsect1"> <a name="gdk3-Pixbufs.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="gdk-pixbuf-get-from-window"></a><h3>gdk_pixbuf_get_from_window ()</h3> <pre class="programlisting"><span class="returnvalue">GdkPixbuf</span> * gdk_pixbuf_get_from_window (<em class="parameter"><code><a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a> *window</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> src_x</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> src_y</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>);</pre> <p>Transfers image data from a <a class="link" href="gdk3-Windows.html#GdkWindow"><span class="type">GdkWindow</span></a> and converts it to an RGB(A) representation inside a <span class="type">GdkPixbuf</span>. In other words, copies image data from a server-side drawable to a client-side RGB(A) buffer. This allows you to efficiently read individual pixels on the client side.</p> <p>This function will create an RGB pixbuf with 8 bits per channel with the size specified by the <em class="parameter"><code>width</code></em> and <em class="parameter"><code>height</code></em> arguments scaled by the scale factor of <em class="parameter"><code>window</code></em> . The pixbuf will contain an alpha channel if the <em class="parameter"><code>window</code></em> contains one.</p> <p>If the window is off the screen, then there is no image data in the obscured/offscreen regions to be placed in the pixbuf. The contents of portions of the pixbuf corresponding to the offscreen region are undefined.</p> <p>If the window you’re obtaining data from is partially obscured by other windows, then the contents of the pixbuf areas corresponding to the obscured regions are undefined.</p> <p>If the window is not mapped (typically because it’s iconified/minimized or not on the current workspace), then <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will be returned.</p> <p>If memory can’t be allocated for the return value, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will be returned instead.</p> <p>(In short, there are several ways this function can fail, and if it fails it returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>; so check the return value.)</p> <div class="refsect3"> <a name="gdk-pixbuf-get-from-window.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>window</p></td> <td class="parameter_description"><p>Source window</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src_x</p></td> <td class="parameter_description"><p>Source X coordinate within <em class="parameter"><code>window</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src_y</p></td> <td class="parameter_description"><p>Source Y coordinate within <em class="parameter"><code>window</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>width</p></td> <td class="parameter_description"><p>Width in pixels of region to get</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>height</p></td> <td class="parameter_description"><p>Height in pixels of region to get</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-pixbuf-get-from-window.returns"></a><h4>Returns</h4> <p>A newly-created pixbuf with a reference count of 1, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error. </p> <p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> <hr> <div class="refsect2"> <a name="gdk-pixbuf-get-from-surface"></a><h3>gdk_pixbuf_get_from_surface ()</h3> <pre class="programlisting"><span class="returnvalue">GdkPixbuf</span> * gdk_pixbuf_get_from_surface (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-surface-t.html#cairo-surface-t"><span class="type">cairo_surface_t</span></a> *surface</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> src_x</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> src_y</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> width</code></em>, <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> height</code></em>);</pre> <p>Transfers image data from a <a href="/usr/share/gtk-doc/html/cairo/cairo-cairo-surface-t.html#cairo-surface-t"><span class="type">cairo_surface_t</span></a> and converts it to an RGB(A) representation inside a <span class="type">GdkPixbuf</span>. This allows you to efficiently read individual pixels from cairo surfaces. For <a href="gdk3-Windows.html#GdkWindow-struct"><span class="type">GdkWindows</span></a>, use <a class="link" href="gdk3-Pixbufs.html#gdk-pixbuf-get-from-window" title="gdk_pixbuf_get_from_window ()"><code class="function">gdk_pixbuf_get_from_window()</code></a> instead.</p> <p>This function will create an RGB pixbuf with 8 bits per channel. The pixbuf will contain an alpha channel if the <em class="parameter"><code>surface</code></em> contains one.</p> <div class="refsect3"> <a name="gdk-pixbuf-get-from-surface.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>surface to copy from</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src_x</p></td> <td class="parameter_description"><p>Source X coordinate within <em class="parameter"><code>surface</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>src_y</p></td> <td class="parameter_description"><p>Source Y coordinate within <em class="parameter"><code>surface</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>width</p></td> <td class="parameter_description"><p>Width in pixels of region to get</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>height</p></td> <td class="parameter_description"><p>Height in pixels of region to get</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-pixbuf-get-from-surface.returns"></a><h4>Returns</h4> <p>A newly-created pixbuf with a reference count of 1, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error. </p> <p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>