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 <span id="projectnumber">3.14.0</span>
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<li class="navelem"><a class="el" href="namespaceGdk.html">Gdk</a></li><li class="navelem"><a class="el" href="classGdk_1_1Visual.html">Visual</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">Gdk::Visual Class Reference</div> </div>
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<p>A <a class="el" href="classGdk_1_1Visual.html" title="A Gdk::Visual describes a particular video hardware display format. ">Gdk::Visual</a> describes a particular video hardware display format.
<a href="classGdk_1_1Visual.html#details">More...</a></p>
<p><code>#include <gdkmm/visual.h></code></p>
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Inheritance diagram for Gdk::Visual:</div>
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<map name="Gdk_1_1Visual_inherit__map" id="Gdk_1_1Visual_inherit__map">
<area shape="rect" id="node2" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1Object.html" title="Glib::Object" alt="" coords="21,155,115,181"/><area shape="rect" id="node3" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1ObjectBase.html" title="Glib::ObjectBase" alt="" coords="5,80,131,107"/><area shape="rect" id="node4" href="http://library.gnome.org/devel/libsigc++/unstable/structsigc_1_1trackable.html" title="sigc::trackable" alt="" coords="11,5,125,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a3e1b56ed29c8c6b4a9b54a4bc14a64a8"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a3e1b56ed29c8c6b4a9b54a4bc14a64a8">~Visual</a> ()</td></tr>
<tr class="separator:a3e1b56ed29c8c6b4a9b54a4bc14a64a8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a23e5a76ba206f65d763186a9161b1f00"><td class="memItemLeft" align="right" valign="top">GdkVisual* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a23e5a76ba206f65d763186a9161b1f00">gobj</a> ()</td></tr>
<tr class="memdesc:a23e5a76ba206f65d763186a9161b1f00"><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C GObject. <a href="#a23e5a76ba206f65d763186a9161b1f00">More...</a><br /></td></tr>
<tr class="separator:a23e5a76ba206f65d763186a9161b1f00"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3452bcc88c3ef7b9d9d1489ac84e3629"><td class="memItemLeft" align="right" valign="top">const GdkVisual* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a3452bcc88c3ef7b9d9d1489ac84e3629">gobj</a> () const </td></tr>
<tr class="memdesc:a3452bcc88c3ef7b9d9d1489ac84e3629"><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C GObject. <a href="#a3452bcc88c3ef7b9d9d1489ac84e3629">More...</a><br /></td></tr>
<tr class="separator:a3452bcc88c3ef7b9d9d1489ac84e3629"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aac860c63e6f3740145653aef122bdf11"><td class="memItemLeft" align="right" valign="top">GdkVisual* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#aac860c63e6f3740145653aef122bdf11">gobj_copy</a> ()</td></tr>
<tr class="memdesc:aac860c63e6f3740145653aef122bdf11"><td class="mdescLeft"> </td><td class="mdescRight">Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. <a href="#aac860c63e6f3740145653aef122bdf11">More...</a><br /></td></tr>
<tr class="separator:aac860c63e6f3740145653aef122bdf11"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a7e10f47bbec94749bf683969e52927a5"><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Screen.html">Screen</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a7e10f47bbec94749bf683969e52927a5">get_screen</a> ()</td></tr>
<tr class="memdesc:a7e10f47bbec94749bf683969e52927a5"><td class="mdescLeft"> </td><td class="mdescRight">Gets the screen to which this visual belongs. <a href="#a7e10f47bbec94749bf683969e52927a5">More...</a><br /></td></tr>
<tr class="separator:a7e10f47bbec94749bf683969e52927a5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a194d4df865f1a72171bae1de27571ca4"><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< const <a class="el" href="classGdk_1_1Screen.html">Screen</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a194d4df865f1a72171bae1de27571ca4">get_screen</a> () const </td></tr>
<tr class="memdesc:a194d4df865f1a72171bae1de27571ca4"><td class="mdescLeft"> </td><td class="mdescRight">Gets the screen to which this visual belongs. <a href="#a194d4df865f1a72171bae1de27571ca4">More...</a><br /></td></tr>
<tr class="separator:a194d4df865f1a72171bae1de27571ca4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af615a02cb1a5bf13d748250d3202e552"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#af615a02cb1a5bf13d748250d3202e552">get_visual_type</a> () const </td></tr>
<tr class="memdesc:af615a02cb1a5bf13d748250d3202e552"><td class="mdescLeft"> </td><td class="mdescRight">Returns the type of visual this is (PseudoColor, TrueColor, etc). <a href="#af615a02cb1a5bf13d748250d3202e552">More...</a><br /></td></tr>
<tr class="separator:af615a02cb1a5bf13d748250d3202e552"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0093c5b3fbc21bed2ca0b7383eb5ef2c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a0093c5b3fbc21bed2ca0b7383eb5ef2c">get_depth</a> () const </td></tr>
<tr class="memdesc:a0093c5b3fbc21bed2ca0b7383eb5ef2c"><td class="mdescLeft"> </td><td class="mdescRight">Returns the bit depth of this visual. <a href="#a0093c5b3fbc21bed2ca0b7383eb5ef2c">More...</a><br /></td></tr>
<tr class="separator:a0093c5b3fbc21bed2ca0b7383eb5ef2c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3df15d1041143c6f20075e1469034d3a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__gdkmmEnums.html#ga23c7243f15304c7a86cf6a20118a7c85">ByteOrder</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a3df15d1041143c6f20075e1469034d3a">get_byte_order</a> ()</td></tr>
<tr class="memdesc:a3df15d1041143c6f20075e1469034d3a"><td class="mdescLeft"> </td><td class="mdescRight">Returns the byte order of this visual. <a href="#a3df15d1041143c6f20075e1469034d3a">More...</a><br /></td></tr>
<tr class="separator:a3df15d1041143c6f20075e1469034d3a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1b3bc9654ddb15048c89e08e8dbc2b2e"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a1b3bc9654ddb15048c89e08e8dbc2b2e">get_colormap_size</a> () const </td></tr>
<tr class="memdesc:a1b3bc9654ddb15048c89e08e8dbc2b2e"><td class="mdescLeft"> </td><td class="mdescRight">Returns the size of a colormap for this visual. <a href="#a1b3bc9654ddb15048c89e08e8dbc2b2e">More...</a><br /></td></tr>
<tr class="separator:a1b3bc9654ddb15048c89e08e8dbc2b2e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a000f87fd3dc00651046fa2c9dbaae05d"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a000f87fd3dc00651046fa2c9dbaae05d">get_bits_per_rgb</a> () const </td></tr>
<tr class="memdesc:a000f87fd3dc00651046fa2c9dbaae05d"><td class="mdescLeft"> </td><td class="mdescRight">Returns the number of significant bits per red, green and blue value. <a href="#a000f87fd3dc00651046fa2c9dbaae05d">More...</a><br /></td></tr>
<tr class="separator:a000f87fd3dc00651046fa2c9dbaae05d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac9713165720bebfa769b274dfc1ae272"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#ac9713165720bebfa769b274dfc1ae272">get_red_pixel_details</a> (guint32& mask, int&<a class="elRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01656.html#gaea38a751275f9e427a7615cd49f4caf8">shift</a>, int& precision) const </td></tr>
<tr class="memdesc:ac9713165720bebfa769b274dfc1ae272"><td class="mdescLeft"> </td><td class="mdescRight">Obtains values that are needed to calculate red pixel values in TrueColor and DirectColor. <a href="#ac9713165720bebfa769b274dfc1ae272">More...</a><br /></td></tr>
<tr class="separator:ac9713165720bebfa769b274dfc1ae272"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a00950ae087e9e5cb3f720f9ab033b830"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a00950ae087e9e5cb3f720f9ab033b830">get_green_pixel_details</a> (guint32& mask, int&<a class="elRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01656.html#gaea38a751275f9e427a7615cd49f4caf8">shift</a>, int& precision) const </td></tr>
<tr class="memdesc:a00950ae087e9e5cb3f720f9ab033b830"><td class="mdescLeft"> </td><td class="mdescRight">Obtains values that are needed to calculate green pixel values in TrueColor and DirectColor. <a href="#a00950ae087e9e5cb3f720f9ab033b830">More...</a><br /></td></tr>
<tr class="separator:a00950ae087e9e5cb3f720f9ab033b830"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad322b8a271797fd244b43bd25d981f1f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#ad322b8a271797fd244b43bd25d981f1f">get_blue_pixel_details</a> (guint32& mask, int&<a class="elRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01656.html#gaea38a751275f9e427a7615cd49f4caf8">shift</a>, int& precision) const </td></tr>
<tr class="memdesc:ad322b8a271797fd244b43bd25d981f1f"><td class="mdescLeft"> </td><td class="mdescRight">Obtains values that are needed to calculate blue pixel values in TrueColor and DirectColor. <a href="#ad322b8a271797fd244b43bd25d981f1f">More...</a><br /></td></tr>
<tr class="separator:ad322b8a271797fd244b43bd25d981f1f"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a675c5005f86616e3000d2e0052e7ecc4"><td class="memItemLeft" align="right" valign="top">static GType </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a675c5005f86616e3000d2e0052e7ecc4">get_type</a> ()</td></tr>
<tr class="memdesc:a675c5005f86616e3000d2e0052e7ecc4"><td class="mdescLeft"> </td><td class="mdescRight">Get the GType for this class, for use with the underlying GObject type system. <a href="#a675c5005f86616e3000d2e0052e7ecc4">More...</a><br /></td></tr>
<tr class="separator:a675c5005f86616e3000d2e0052e7ecc4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4724a117dabcb795c406fea0172e3d08"><td class="memItemLeft" align="right" valign="top">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a4724a117dabcb795c406fea0172e3d08">get_system</a> ()</td></tr>
<tr class="memdesc:a4724a117dabcb795c406fea0172e3d08"><td class="mdescLeft"> </td><td class="mdescRight">Get the system’s default visual for the default GDK screen. <a href="#a4724a117dabcb795c406fea0172e3d08">More...</a><br /></td></tr>
<tr class="separator:a4724a117dabcb795c406fea0172e3d08"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8d67541c7ac1cca24b20f1e04a654c9e"><td class="memItemLeft" align="right" valign="top">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a8d67541c7ac1cca24b20f1e04a654c9e">get_best</a> ()</td></tr>
<tr class="memdesc:a8d67541c7ac1cca24b20f1e04a654c9e"><td class="mdescLeft"> </td><td class="mdescRight">Get the visual with the most available colors for the default GDK screen. <a href="#a8d67541c7ac1cca24b20f1e04a654c9e">More...</a><br /></td></tr>
<tr class="separator:a8d67541c7ac1cca24b20f1e04a654c9e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2f44b4029c4b3091f567903f6991e88a"><td class="memItemLeft" align="right" valign="top">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a2f44b4029c4b3091f567903f6991e88a">get_best</a> (int depth)</td></tr>
<tr class="memdesc:a2f44b4029c4b3091f567903f6991e88a"><td class="mdescLeft"> </td><td class="mdescRight">Get the best visual with depth <em>depth</em> for the default GDK screen. <a href="#a2f44b4029c4b3091f567903f6991e88a">More...</a><br /></td></tr>
<tr class="separator:a2f44b4029c4b3091f567903f6991e88a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a23a87ca05f0ff38962c341fad1698239"><td class="memItemLeft" align="right" valign="top">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a23a87ca05f0ff38962c341fad1698239">get_best</a> (<a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> visual_type)</td></tr>
<tr class="memdesc:a23a87ca05f0ff38962c341fad1698239"><td class="mdescLeft"> </td><td class="mdescRight">Get the best visual of the given <em>visual_type</em> for the default GDK screen. <a href="#a23a87ca05f0ff38962c341fad1698239">More...</a><br /></td></tr>
<tr class="separator:a23a87ca05f0ff38962c341fad1698239"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa58e64d37a98afc31f4a09412b558863"><td class="memItemLeft" align="right" valign="top">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#aa58e64d37a98afc31f4a09412b558863">get_best</a> (int depth, <a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> visual_type)</td></tr>
<tr class="memdesc:aa58e64d37a98afc31f4a09412b558863"><td class="mdescLeft"> </td><td class="mdescRight">Combines get_best_with_depth() and get_best_with_type(). <a href="#aa58e64d37a98afc31f4a09412b558863">More...</a><br /></td></tr>
<tr class="separator:aa58e64d37a98afc31f4a09412b558863"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4033654c987ba7208b7f1ab8e53c04a2"><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a4033654c987ba7208b7f1ab8e53c04a2">get_best_depth</a> ()</td></tr>
<tr class="memdesc:a4033654c987ba7208b7f1ab8e53c04a2"><td class="mdescLeft"> </td><td class="mdescRight">Get the best available depth for the default GDK screen. <a href="#a4033654c987ba7208b7f1ab8e53c04a2">More...</a><br /></td></tr>
<tr class="separator:a4033654c987ba7208b7f1ab8e53c04a2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9653abce581c94fca4dca322ffb4e16d"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a9653abce581c94fca4dca322ffb4e16d">get_best_type</a> ()</td></tr>
<tr class="memdesc:a9653abce581c94fca4dca322ffb4e16d"><td class="mdescLeft"> </td><td class="mdescRight">Return the best available visual type for the default GDK screen. <a href="#a9653abce581c94fca4dca322ffb4e16d">More...</a><br /></td></tr>
<tr class="separator:a9653abce581c94fca4dca322ffb4e16d"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:a04412275c902225a6bd103d0a5f3ad2e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a04412275c902225a6bd103d0a5f3ad2e">Visual</a> ()</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="related"></a>
Related Functions</h2></td></tr>
<tr><td class="ititle" colspan="2"><p>(Note that these are not member functions.) </p>
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<tr class="memitem:a151170bd9f613ba53f811871166a6f55"><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Gdk::Visual</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classGdk_1_1Visual.html#a151170bd9f613ba53f811871166a6f55">wrap</a> (GdkVisual* object, bool take_copy=false)</td></tr>
<tr class="memdesc:a151170bd9f613ba53f811871166a6f55"><td class="mdescLeft"> </td><td class="mdescRight">A <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/namespaceGlib.html#a671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object. <a href="#a151170bd9f613ba53f811871166a6f55">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A <a class="el" href="classGdk_1_1Visual.html" title="A Gdk::Visual describes a particular video hardware display format. ">Gdk::Visual</a> describes a particular video hardware display format. </p>
<p>It includes information about the number of bits used for each color, the way the bits are translated into an RGB value for display, and the way the bits are stored in memory. For example, a piece of display hardware might support 24-bit color, 16-bit color, or 8-bit color; meaning 24/16/8-bit pixel sizes. For a given pixel size, pixels can be in different formats; for example the "red" element of an RGB pixel may be in the top 8 bits of the pixel, or may be in the lower 4 bits.</p>
<p>There are several standard visuals. The visual returned by <a class="el" href="classGdk_1_1Screen.html#afbc7f0ced954e5d7cc4b3b823f09955e" title="Get the system’s default visual for screen. ">Gdk::Screen::get_system_visual()</a> is the system's default visual.</p>
<p>A number of methods are provided for determining the "best" available visual. For the purposes of making this determination, higher bit depths are considered better, and for visuals of the same bit depth, GDK_VISUAL_PSEUDO_COLOR is preferred at 8bpp, otherwise, the visual types are ranked in the order of (highest to lowest) GDK_VISUAL_DIRECT_COLOR, GDK_VISUAL_TRUE_COLOR, GDK_VISUAL_PSEUDO_COLOR, GDK_VISUAL_STATIC_COLOR, GDK_VISUAL_GRAYSCALE, then GDK_VISUAL_STATIC_GRAY. </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">virtual Gdk::Visual::~Visual </td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<p>Get the visual with the most available colors for the default GDK screen. </p>
<p>The return value should not be freed.</p>
<dl class="section return"><dt>Returns</dt><dd>Best visual. </dd></dl>
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<p>Get the best visual with depth <em>depth</em> for the default GDK screen. </p>
<p><a class="el" href="classGdk_1_1Color.html" title="Gdk::Color is used to describe an allocated or unallocated color. ">Color</a> visuals and visuals with mutable colormaps are preferred over grayscale or fixed-colormap visuals. The return value should not be freed. <code>0</code> may be returned if no visual supports <em>depth</em>.</p>
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<tr><td class="paramname">depth</td><td>A bit depth. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Best visual for the given depth. </dd></dl>
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<p>Get the best visual of the given <em>visual_type</em> for the default GDK screen. </p>
<p>Visuals with higher color depths are considered better. The return value should not be freed. <code>0</code> may be returned if no visual has type <em>visual_type</em>.</p>
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<dl class="section return"><dt>Returns</dt><dd>Best visual of the given type. </dd></dl>
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<p>Combines get_best_with_depth() and get_best_with_type(). </p>
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<tr><td class="paramname">depth</td><td>A bit depth. </td></tr>
<tr><td class="paramname">visual_type</td><td>A visual type. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Best visual with both <em>depth</em> and <em>visual_type</em>, or <code>0</code> if none. </dd></dl>
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<p>Get the best available depth for the default GDK screen. </p>
<p>“Best” means “largest,” i.e. 32 preferred over 24 preferred over 8 bits per pixel.</p>
<dl class="section return"><dt>Returns</dt><dd>Best available depth. </dd></dl>
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<td class="memname">static <a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> Gdk::Visual::get_best_type </td>
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<p>Return the best available visual type for the default GDK screen. </p>
<dl class="section return"><dt>Returns</dt><dd>Best visual type. </dd></dl>
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<td class="memname">int Gdk::Visual::get_bits_per_rgb </td>
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<p>Returns the number of significant bits per red, green and blue value. </p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000012">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The number of significant bits per color value for <em>visual</em>. </dd></dl>
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<td class="memname">void Gdk::Visual::get_blue_pixel_details </td>
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<p>Obtains values that are needed to calculate blue pixel values in TrueColor and DirectColor. </p>
<p>The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the "mask"). Finally, "precision" refers to how much precision the pixel value contains for a particular primary.</p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000015">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
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<tr><td class="paramname">mask</td><td>A pointer to a #guint32 to be filled in, or <code>0</code>. </td></tr>
<tr><td class="paramname">shift</td><td>A pointer to a <code>int</code> to be filled in, or <code>0</code>. </td></tr>
<tr><td class="paramname">precision</td><td>A pointer to a <code>int</code> to be filled in, or <code>0</code>. </td></tr>
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<td class="memname"><a class="el" href="group__gdkmmEnums.html#ga23c7243f15304c7a86cf6a20118a7c85">ByteOrder</a> Gdk::Visual::get_byte_order </td>
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<p>Returns the byte order of this visual. </p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000010">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>A <a class="el" href="group__gdkmmEnums.html#ga23c7243f15304c7a86cf6a20118a7c85" title="A set of values describing the possible byte-orders for storing pixel values in memory. ">Gdk::ByteOrder</a> stating the byte order of <em>visual</em>. </dd></dl>
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<p>Returns the size of a colormap for this visual. </p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000011">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The size of a colormap that is suitable for <em>visual</em>. </dd></dl>
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<p>Returns the bit depth of this visual. </p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000009">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The bit depth of this visual. </dd></dl>
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<td class="memname">void Gdk::Visual::get_green_pixel_details </td>
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<p>Obtains values that are needed to calculate green pixel values in TrueColor and DirectColor. </p>
<p>The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the "mask"). Finally, "precision" refers to how much precision the pixel value contains for a particular primary.</p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000014">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
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<tr><td class="paramname">mask</td><td>A pointer to a #guint32 to be filled in, or <code>0</code>. </td></tr>
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<tr><td class="paramname">precision</td><td>A pointer to a <code>int</code> to be filled in, or <code>0</code>. </td></tr>
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<p>Obtains values that are needed to calculate red pixel values in TrueColor and DirectColor. </p>
<p>The “mask” is the significant bits within the pixel. The “shift” is the number of bits left we must shift a primary for it to be in position (according to the "mask"). Finally, "precision" refers to how much precision the pixel value contains for a particular primary.</p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000013">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
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<tr><td class="paramname">mask</td><td>A pointer to a #guint32 to be filled in, or <code>0</code>. </td></tr>
<tr><td class="paramname">shift</td><td>A pointer to a <code>int</code> to be filled in, or <code>0</code>. </td></tr>
<tr><td class="paramname">precision</td><td>A pointer to a <code>int</code> to be filled in, or <code>0</code>. </td></tr>
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<p>Gets the screen to which this visual belongs. </p>
<dl class="since_2_2"><dt><b><a class="el" href="since_2_2.html#_since_2_2000061">Since gtkmm 2.2:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The screen to which this visual belongs. </dd></dl>
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<td class="memname"><a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a><const <a class="el" href="classGdk_1_1Screen.html">Screen</a>> Gdk::Visual::get_screen </td>
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<p>Gets the screen to which this visual belongs. </p>
<dl class="since_2_2"><dt><b><a class="el" href="since_2_2.html#_since_2_2000062">Since gtkmm 2.2:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The screen to which this visual belongs. </dd></dl>
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<td class="memname">static <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a><<a class="el" href="classGdk_1_1Visual.html">Visual</a>> Gdk::Visual::get_system </td>
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<p>Get the system’s default visual for the default GDK screen. </p>
<p>This is the visual for the root window of the display. The return value should not be freed.</p>
<dl class="section return"><dt>Returns</dt><dd>System visual. </dd></dl>
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<td class="memname">static GType Gdk::Visual::get_type </td>
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<p>Get the GType for this class, for use with the underlying GObject type system. </p>
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<td class="memname"><a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620">VisualType</a> Gdk::Visual::get_visual_type </td>
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<p>Returns the type of visual this is (PseudoColor, TrueColor, etc). </p>
<dl class="since_2_22"><dt><b><a class="el" href="since_2_22.html#_since_2_22000008">Since gtkmm 2.22:</a></b></dt><dd></dd></dl>
<dl class="section return"><dt>Returns</dt><dd>A <a class="el" href="group__gdkmmEnums.html#gaf51d8a92358be17e8bdcbe2a229d1620" title="A set of values that describe the manner in which the pixel values for a visual are converted into RG...">Gdk::VisualType</a> stating the type of <em>visual</em>. </dd></dl>
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<td class="memname">GdkVisual* Gdk::Visual::gobj </td>
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<p>Provides access to the underlying C GObject. </p>
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<td class="memname">const GdkVisual* Gdk::Visual::gobj </td>
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<p>Provides access to the underlying C GObject. </p>
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<p>Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. </p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<td class="memname"><a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1RefPtr.html">Glib::RefPtr</a>< <a class="el" href="classGdk_1_1Visual.html">Gdk::Visual</a> > wrap </td>
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<p>A <a class="elRef" href="http://library.gnome.org/devel/glibmm/unstable/namespaceGlib.html#a671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">object</td><td>The C instance. </td></tr>
<tr><td class="paramname">take_copy</td><td>False if the result should take ownership of the C instance. True if it should take a new copy or ref. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>A C++ instance that wraps this C instance. </dd></dl>
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