pangocairo-private.h

Pango is a library for layout and rendering of text, with an emphasis on internationalization. Pang

/* Pango
 * pangocairo-private.h: private symbols for the Cairo backend
 *
 * Copyright (C) 2000,2004 Red Hat, Inc.
 *
 * 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 __PANGOCAIRO_PRIVATE_H__
#define __PANGOCAIRO_PRIVATE_H__

#include <pango/pangocairo.h>
#include <pango/pango-renderer.h>

G_BEGIN_DECLS


#define PANGO_CAIRO_FONT_MAP_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), PANGO_TYPE_CAIRO_FONT_MAP, PangoCairoFontMapIface))

typedef struct _PangoCairoFontMapIface PangoCairoFontMapIface;

struct _PangoCairoFontMapIface
{
  GTypeInterface g_iface;

  void           (*set_resolution) (PangoCairoFontMap *fontmap,
				    double             dpi);
  double         (*get_resolution) (PangoCairoFontMap *fontmap);

  cairo_font_type_t (*get_font_type) (PangoCairoFontMap *fontmap);
};


#define PANGO_CAIRO_FONT_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), PANGO_TYPE_CAIRO_FONT, PangoCairoFontIface))

typedef struct _PangoCairoFontIface                  PangoCairoFontIface;
typedef struct _PangoCairoFontPrivate                PangoCairoFontPrivate;
typedef struct _PangoCairoFontHexBoxInfo             PangoCairoFontHexBoxInfo;
typedef struct _PangoCairoFontPrivateScaledFontData  PangoCairoFontPrivateScaledFontData;
typedef struct _PangoCairoFontGlyphExtentsCacheEntry PangoCairoFontGlyphExtentsCacheEntry;

struct _PangoCairoFontHexBoxInfo
{
  PangoCairoFont *font;
  int rows;
  double digit_width;
  double digit_height;
  double pad_x;
  double pad_y;
  double line_width;
  double box_descent;
  double box_height;
};

struct _PangoCairoFontPrivateScaledFontData
{
  cairo_matrix_t font_matrix;
  cairo_matrix_t ctm;
  cairo_font_options_t *options;
};

struct _PangoCairoFontPrivate
{
  PangoCairoFont *cfont;
   
  PangoCairoFontPrivateScaledFontData *data;

  cairo_scaled_font_t *scaled_font;
  PangoCairoFontHexBoxInfo *hbi;

  gboolean is_hinted;
  PangoGravity gravity;

  PangoRectangle font_extents;
  PangoCairoFontGlyphExtentsCacheEntry *glyph_extents_cache;

  GSList *metrics_by_lang;
};

struct _PangoCairoFontIface
{
  GTypeInterface g_iface;

  cairo_font_face_t *(*create_font_face) (PangoCairoFont *cfont);
  PangoFontMetrics *(*create_metrics_for_context) (PangoCairoFont *cfont,
						   PangoContext   *context);

  gssize cf_priv_offset;
};

gboolean _pango_cairo_font_install (PangoFont *font,
				    cairo_t   *cr);
PangoFontMetrics * _pango_cairo_font_get_metrics (PangoFont     *font,
						  PangoLanguage *language);
PangoCairoFontHexBoxInfo *_pango_cairo_font_get_hex_box_info (PangoCairoFont *cfont);

void _pango_cairo_font_private_initialize (PangoCairoFontPrivate      *cf_priv,
					   PangoCairoFont             *font,
					   PangoContext               *context,
					   const PangoFontDescription *desc,
					   const cairo_matrix_t       *font_matrix);
void _pango_cairo_font_private_finalize (PangoCairoFontPrivate *cf_priv);
cairo_scaled_font_t *_pango_cairo_font_private_get_scaled_font (PangoCairoFontPrivate *cf_priv);
gboolean _pango_cairo_font_private_is_metrics_hinted (PangoCairoFontPrivate *cf_priv);
void _pango_cairo_font_private_get_glyph_extents (PangoCairoFontPrivate *cf_priv,
						  PangoGlyph             glyph,
						  PangoRectangle        *ink_rect,
						  PangoRectangle        *logical_rect);

#define PANGO_TYPE_CAIRO_RENDERER            (pango_cairo_renderer_get_type())
#define PANGO_CAIRO_RENDERER(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_CAIRO_RENDERER, PangoCairoRenderer))
#define PANGO_IS_CAIRO_RENDERER(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), PANGO_TYPE_CAIRO_RENDERER))

typedef struct _PangoCairoRenderer PangoCairoRenderer;

GType pango_cairo_renderer_get_type    (void) G_GNUC_CONST;


const cairo_font_options_t *_pango_cairo_context_get_merged_font_options (PangoContext *context);


G_END_DECLS

#endif /* __PANGOCAIRO_PRIVATE_H__ */