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/* Pango
* pango-engine.h: Module handling
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __PANGO_ENGINE_H__
#define __PANGO_ENGINE_H__
#include <pango/pango-types.h>
#include <pango/pango-item.h>
#include <pango/pango-font.h>
#include <pango/pango-glyph.h>
G_BEGIN_DECLS
#ifdef PANGO_ENABLE_ENGINE
/* Module API */
#define PANGO_ENGINE_TYPE_LANG "PangoEngineLang"
#define PANGO_ENGINE_TYPE_SHAPE "PangoEngineShape"
#define PANGO_RENDER_TYPE_NONE "PangoRenderNone"
typedef struct _PangoEngineInfo PangoEngineInfo;
typedef struct _PangoEngineRange PangoEngineRange;
typedef struct _PangoEngine PangoEngine;
struct _PangoEngineRange
{
guint32 start;
guint32 end;
gchar *langs;
};
struct _PangoEngineInfo
{
gchar *id;
gchar *engine_type;
gchar *render_type;
PangoEngineRange *ranges;
gint n_ranges;
};
struct _PangoEngine
{
gchar *id;
gchar *type;
gint length;
};
struct _PangoEngineLang
{
PangoEngine engine;
void (*script_break) (const char *text,
int len,
PangoAnalysis *analysis,
PangoLogAttr *attrs,
int attrs_len);
};
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);
};
/* A module should export the following functions */
void script_engine_list (PangoEngineInfo **engines,
int *n_engines);
PangoEngine *script_engine_load (const char *id);
void script_engine_unload (PangoEngine *engine);
/* Macro used for possibly builtin Pango modules. Not useful
* for externally build modules. If we are compiling a module standaline,
* then we name the entry points script_engine_list, etc. But if we
* are compiling it for inclusion directly in Pango, then we need them to
* to have distinct names for this module, so we prepend a prefix.
*
* The two intermediate macros are to deal with details of the C
* preprocessor; token pasting tokens must be function arguments,
* and macro substitution isn't used on function arguments that
* are used for token pasting.
*/
#ifdef PANGO_MODULE_PREFIX
#define PANGO_MODULE_ENTRY(func) _PANGO_MODULE_ENTRY2(PANGO_MODULE_PREFIX,func)
#define _PANGO_MODULE_ENTRY2(prefix,func) _PANGO_MODULE_ENTRY3(prefix,func)
#define _PANGO_MODULE_ENTRY3(prefix,func) prefix##_script_engine_##func
#else
#define PANGO_MODULE_ENTRY(func) script_engine_##func
#endif
#endif /* PANGO_ENABLE_ENGINE */
G_END_DECLS
#endif /* __PANGO_ENGINE_H__ */
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