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><H1
><A
NAME="PANGO-ENGINES"
></A
>Engines</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN10413"
></A
><H2
>Name</H2
>Engines -- language-specific and rendering-system-specific processing.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN10416"
></A
><H2
>Synopsis</H2
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
>
struct <A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
>;
struct <A
HREF="pango-engines.html#PANGOENGINERANGE"
>PangoEngineRange</A
>;
struct <A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
>;
struct <A
HREF="pango-engines.html#PANGOENGINELANG"
>PangoEngineLang</A
>;
struct <A
HREF="pango-engines.html#PANGOENGINESHAPE"
>PangoEngineShape</A
>;
#define <A
HREF="pango-engines.html#PANGO-ENGINE-TYPE-LANG-CAPS"
>PANGO_ENGINE_TYPE_LANG</A
>
#define <A
HREF="pango-engines.html#PANGO-ENGINE-TYPE-SHAPE-CAPS"
>PANGO_ENGINE_TYPE_SHAPE</A
>
#define <A
HREF="pango-engines.html#PANGO-RENDER-TYPE-NONE-CAPS"
>PANGO_RENDER_TYPE_NONE</A
>
void <A
HREF="pango-engines.html#SCRIPT-ENGINE-LIST"
>script_engine_list</A
> (<A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
> **engines,
int *n_engines);
<A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
>* <A
HREF="pango-engines.html#SCRIPT-ENGINE-LOAD"
>script_engine_load</A
> (const char *id);
void <A
HREF="pango-engines.html#SCRIPT-ENGINE-UNLOAD"
>script_engine_unload</A
> (<A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> *engine);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN10433"
></A
><H2
>Description</H2
><P
>Pango utilizes a module architecture in which the language-specific
and render-system-specific components are provided by loadable
modules. Each loadable module supplies one or more
<I
CLASS="FIRSTTERM"
>engines</I
>. Each <I
CLASS="FIRSTTERM"
>engine</I
>
has an associated <I
CLASS="FIRSTTERM"
>engine type</I
> and
<I
CLASS="FIRSTTERM"
>render type</I
>. These two types are represented by
strings.</P
><P
>Each dynamically-loaded module exports several functions which provide
the public API. These functions are <A
HREF="pango-engines.html#SCRIPT-ENGINE-LIST"
>script_engine_list</A
>(),
<A
HREF="pango-engines.html#SCRIPT-ENGINE-LOAD"
>script_engine_load</A
>() and <A
HREF="pango-engines.html#SCRIPT-ENGINE-UNLOAD"
>script_engine_unload</A
>(). The latter two
functions are used for loading and unloading modules, while the first
function is used when building a catalog of all available modules.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN10444"
></A
><H2
>Details</H2
><DIV
CLASS="REFSECT2"
><A
NAME="AEN10446"
></A
><H3
><A
NAME="PANGOENGINEINFO"
></A
>struct PangoEngineInfo</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct PangoEngineInfo
{
gchar *id;
gchar *engine_type;
gchar *render_type;
PangoEngineRange *ranges;
gint n_ranges;
};</PRE
></TD
></TR
></TABLE
><P
>The <A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
> structure contains information about a particular
engine. It contains the following fields:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10452"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFF0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *id;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>a unique string ID for the engine.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *engine_type;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>a string identifying the engine type.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *render type;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>a string identifying the render type.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="pango-engines.html#PANGOENGINERANGE"
>PangoEngineRange</A
> *ranges;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>a pointer to an array of <A
HREF="pango-engines.html#PANGOENGINERANGE"
>PangoEngineRange</A
>
structures. Each structure contains information
about a range of Unicode code points that
this engine handles.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gint n_ranges;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the number of elements in <TT
CLASS="STRUCTFIELD"
><I
>ranges</I
></TT
>.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10475"
></A
><H3
><A
NAME="PANGOENGINERANGE"
></A
>struct PangoEngineRange</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct PangoEngineRange
{
guint32 start;
guint32 end;
gchar *langs;
};</PRE
></TD
></TR
></TABLE
><P
>The PangoEngineRange structure contains
information about a range of Unicode code
points. It contains the following fields:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10480"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFF0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>guint32 start;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the first code point in the range.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>guint32 end;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the last code point for the range.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *langs;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>A semicolon separated list of languages that this
engine handles for this range. This may be empty,
in which case the engine is saying that it is a
fallback choice for all languages for this range,
but should not be used if another engine
indicates that it is specific for the language for
a given code point. An entry in this list of "*"
indicates that this engine is specific to all
languages for this range.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10494"
></A
><H3
><A
NAME="PANGOENGINE"
></A
>struct PangoEngine</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct PangoEngine
{
gchar *id;
gchar *type;
gint length;
};</PRE
></TD
></TR
></TABLE
><P
>The <A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> structure contains basic
information common to all script engines. It
contains the following fields:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10500"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFF0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *id;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>a unique string ID for this language engine.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gchar *type;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>The "type" of the engine. (Is this engine type or render type??).</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>gint length;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the length of the entire structure in bytes. This is
provided so that new functions can be added at the
end of subtypes of <A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> without breaking
older modules.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10515"
></A
><H3
><A
NAME="PANGOENGINELANG"
></A
>struct PangoEngineLang</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct PangoEngineLang
{
PangoEngine engine;
void (*script_break) (const char *text,
int len,
PangoAnalysis *analysis,
PangoLogAttr *attrs,
int attrs_len);
};</PRE
></TD
></TR
></TABLE
><P
>The <A
HREF="pango-engines.html#PANGOENGINELANG"
>PangoEngineLang</A
> structure extends the
basic <A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> structure to engines that
deal with the rendering-system independent part
of of the rendering pipeline. It contains the following fields:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10522"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFF0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> engine;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>A nested structure containing basic engine data.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
>void (*script_break) (...);</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>A function that provides an implementation
for <A
HREF="pango-text-processing.html#PANGO-BREAK"
>pango_break</A
>().</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10535"
></A
><H3
><A
NAME="PANGOENGINESHAPE"
></A
>struct PangoEngineShape</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>struct PangoEngineShape
{
PangoEngine engine;
void (*script_shape) (PangoFont *font,
const char *text,
int length,
PangoAnalysis *analysis,
PangoGlyphString *glyphs);
PangoCoverage *(*get_coverage) (PangoFont *font,
PangoLanguage *language);
};</PRE
></TD
></TR
></TABLE
><P
>The <A
HREF="pango-engines.html#PANGOENGINESHAPE"
>PangoEngineShape</A
> structure extends the
basic <A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> structure to engines that
deal with the rendering-system dependent part
of of the rendering pipeline. It contains the following fields:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10542"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFF0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
><A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> engine;</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>A nested structure containing basic engine data.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="LEFT"
VALIGN="TOP"
> void (*script_shape) (...);</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>A function that provides an implementation
for pango_shape.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10554"
></A
><H3
><A
NAME="PANGO-ENGINE-TYPE-LANG-CAPS"
></A
>PANGO_ENGINE_TYPE_LANG</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define PANGO_ENGINE_TYPE_LANG "PangoEngineLang"</PRE
></TD
></TR
></TABLE
><P
>A string constant defining the engine type
for <I
CLASS="FIRSTTERM"
>language engines</I
>.
These engines have a engine structure of
type <A
HREF="pango-engines.html#PANGOENGINELANG"
>PangoEngineLang</A
>.</P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10561"
></A
><H3
><A
NAME="PANGO-ENGINE-TYPE-SHAPE-CAPS"
></A
>PANGO_ENGINE_TYPE_SHAPE</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define PANGO_ENGINE_TYPE_SHAPE "PangoEngineShape"</PRE
></TD
></TR
></TABLE
><P
>A string constant defining the engine type
for <I
CLASS="FIRSTTERM"
>shaping engines</I
>.
These engines have a engine structure of
type <A
HREF="pango-engines.html#PANGOENGINESHAPE"
>PangoEngineShape</A
>.</P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10568"
></A
><H3
><A
NAME="PANGO-RENDER-TYPE-NONE-CAPS"
></A
>PANGO_RENDER_TYPE_NONE</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>#define PANGO_RENDER_TYPE_NONE "PangoRenderNone"</PRE
></TD
></TR
></TABLE
><P
>A string constant defining the render type
for engines that are not rendering-system
specific.</P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10573"
></A
><H3
><A
NAME="SCRIPT-ENGINE-LIST"
></A
>script_engine_list ()</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void script_engine_list (<A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
> **engines,
int *n_engines);</PRE
></TD
></TR
></TABLE
><P
>Function to be provided by a module to list the engines that the
module supplies. The function stores a pointer to an array
of <A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
> structures and the length of that array in
the given location.</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10580"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFD0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>engines</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>location to store a pointer to an array of engines.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>n_engines</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>location to store the number of elements in <TT
CLASS="PARAMETER"
><I
>engines</I
></TT
>.
</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10594"
></A
><H3
><A
NAME="SCRIPT-ENGINE-LOAD"
></A
>script_engine_load ()</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
><A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
>* script_engine_load (const char *id);</PRE
></TD
></TR
></TABLE
><P
>Function to be provided by a module to load a particular engine.</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10600"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFD0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>id</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the ID from the <A
HREF="pango-engines.html#PANGOENGINEINFO"
>PangoEngineInfo</A
> structure of the
module to load.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Returns</I
></SPAN
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the newly created script engine.
</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN10614"
></A
><H3
><A
NAME="SCRIPT-ENGINE-UNLOAD"
></A
>script_engine_unload ()</H3
><TABLE
BORDER="0"
BGCOLOR="#D6E8FF"
WIDTH="100%"
CELLPADDING="6"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void script_engine_unload (<A
HREF="pango-engines.html#PANGOENGINE"
>PangoEngine</A
> *engine);</PRE
></TD
></TR
></TABLE
><P
>Function to be provided by a module to unload an engine loaded
with <A
HREF="pango-engines.html#SCRIPT-ENGINE-LOAD"
>script_engine_load</A
>().</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN10621"
></A
><P
></P
><TABLE
BORDER="0"
WIDTH="100%"
BGCOLOR="#FFD0D0"
CELLSPACING="0"
CELLPADDING="4"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>engine</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
>the engine to unload.
</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><BR
CLEAR="all"><BR><TABLE
WIDTH="100%"
BORDER="0"
BGCOLOR="#000000"
CELLPADDING="1"
CELLSPACING="0"
><TR
><TD
WIDTH="25%"
BGCOLOR="#C00000"
ALIGN="left"
><A
HREF="pango-coverage-maps.html"
><FONT
COLOR="#FFFFFF"
SIZE="3"
><B
><<< Previous Page</B
></FONT
></A
></TD
><TD
WIDTH="25%"
BGCOLOR="#0000C0"
ALIGN="center"
><FONT
COLOR="#FFFFFF"
SIZE="3"
><B
><A
HREF="index.html"
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