mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-27 18:05:34 +00:00
193 lines
8.4 KiB
XML
193 lines
8.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
|
<refentry id="glXUseXFont">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glXUseXFont</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glXUseXFont</refname>
|
|
<refpurpose>create bitmap display lists from an X font</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glXUseXFont</function></funcdef>
|
|
<paramdef>Font <parameter>font</parameter></paramdef>
|
|
<paramdef>int <parameter>first</parameter></paramdef>
|
|
<paramdef>int <parameter>count</parameter></paramdef>
|
|
<paramdef>int <parameter>listBase</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<!-- eqn: ignoring delim $$ -->
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>font</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the font from which character glyphs are to be taken.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>first</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the index of the first glyph to be taken.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>count</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the number of glyphs to be taken.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>listBase</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the index of the first display list to be generated.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
<function>glXUseXFont</function> generates <parameter>count</parameter> display lists,
|
|
named <parameter>listBase</parameter> through
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: listBase + count - 1:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">listBase</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">count</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>,
|
|
each containing a single <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry> command.
|
|
The parameters of the <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry> command of display list
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: listBase + i:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">listBase</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">i</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>
|
|
are derived from glyph
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: first + i:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">first</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">i</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>.
|
|
Bitmap parameters
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">xorig</mml:mi></mml:math></inlineequation>,
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">yorig</mml:mi></mml:math></inlineequation>,
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">width</mml:mi></mml:math></inlineequation>,
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">height</mml:mi></mml:math></inlineequation>
|
|
are computed from font metrics as
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: descent-1:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">descent</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>,
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: -lbearing:-->
|
|
<mml:mrow>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mi mathvariant="italic">lbearing</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>,
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: rbearing - lbearing:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">rbearing</mml:mi>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mi mathvariant="italic">lbearing</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>,
|
|
and
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: ascent+descent:-->
|
|
<mml:mrow>
|
|
<mml:mi mathvariant="italic">ascent</mml:mi>
|
|
<mml:mo>+</mml:mo>
|
|
<mml:mi mathvariant="italic">descent</mml:mi>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>,
|
|
respectively.
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">xmove</mml:mi></mml:math></inlineequation>
|
|
is taken from the glyph's
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">width</mml:mi></mml:math></inlineequation>
|
|
metric,
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">ymove</mml:mi></mml:math></inlineequation>
|
|
is set to zero.
|
|
Finally,
|
|
the glyph's image is converted to the appropriate format for <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>.
|
|
</para>
|
|
<para>
|
|
Using <function>glXUseXFont</function> may be more efficient than accessing the X font and generating
|
|
the display lists explicitly,
|
|
both because the display lists are created on the server without requiring
|
|
a round trip of the glyph data,
|
|
and because the server may choose to delay the creation of each
|
|
bitmap until it is accessed.
|
|
</para>
|
|
<para>
|
|
Empty display lists are created for all glyphs that are requested and
|
|
are not defined in <parameter>font</parameter>.
|
|
<function>glXUseXFont</function> is ignored if there is no current GLX context.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>BadFont</constant> is generated if <parameter>font</parameter> is not a valid font.
|
|
</para>
|
|
<para>
|
|
<constant>GLXBadContextState</constant> is generated if the current GLX context is
|
|
in display-list construction mode.
|
|
</para>
|
|
<para>
|
|
<constant>GLXBadCurrentWindow</constant> is generated if the drawable associated
|
|
with the current context of the calling thread is a window, and that
|
|
window is no longer valid.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glXMakeCurrent</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006
|
|
Silicon Graphics, Inc. This document is licensed under the SGI
|
|
Free Software B License. For details, see
|
|
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|