deliantra/Deliantra-Client/pango-font.c

/* Pango
 * OpenGL Freetype2 handling
 *
 * Copyright (C) 1999 Red Hat Software
 * Copyright (C) 2000 Tor Lillqvist
 * Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
 *
 * This file 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 file 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.
 */

#define PANGO_ENABLE_BACKEND

#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include <glib/gprintf.h>

#include "pangoopengl.h"

#include "pango/pangofc-font.h"
#include "pango/pangofc-fontmap.h"

#define PANGO_OPENGL_FONT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_OPENGL_FONT, PangoOpenGLFontClass))
#define PANGO_OPENGL_IS_FONT_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_OPENGL_FONT))
#define PANGO_OPENGL_FONT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_OPENGL_FONT, PangoOpenGLFontClass))

typedef struct _PangoOpenGLFontClass   PangoOpenGLFontClass;

struct _PangoOpenGLFontClass
{
  PangoFcFontClass parent_class;
};

static void pango_opengl_font_finalize (GObject *object);

static void pango_opengl_font_get_glyph_extents (PangoFont *font,
                                                 PangoGlyph glyph,
                                                 PangoRectangle *ink_rect,
                                                 PangoRectangle *logical_rect);

static FT_Face pango_opengl_font_real_lock_face   (PangoFcFont      *font);
static void    pango_opengl_font_real_unlock_face (PangoFcFont      *font);

PangoOpenGLFont *
_pango_opengl_font_new (PangoOpenGLFontMap *fontmap_, FcPattern *pattern)
{
  PangoFontMap *fontmap = PANGO_FONT_MAP (fontmap_);
  PangoOpenGLFont *font;
  double d;

  g_return_val_if_fail (fontmap != NULL, NULL);
  g_return_val_if_fail (pattern != NULL, NULL);

  font = (PangoOpenGLFont *)g_object_new (PANGO_TYPE_OPENGL_FONT,
                                          "pattern", pattern,
                                          NULL);

  if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &d) == FcResultMatch)
    font->size = d * PANGO_SCALE;

  /* pango 1.24 is ABI-incompatible with 1.22, but distros */
  /* usually package it under the same name, so a runtime check */
  /* is required */
  if (pango_version () > PANGO_VERSION_ENCODE (1, 23, 0))
    PANGO_FC_FONT (font)->fontmap = fontmap;

  return font;
}

static void
load_fallback_face (PangoOpenGLFont *font, const char *original_file)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (font);
  FcPattern *sans;
  FcPattern *matched;
  FcResult result;
  FT_Error error;
  FcChar8 *filename2 = NULL;
  gchar *name;
  int id;
  
  sans = FcPatternBuild (NULL,
                         FC_FAMILY,     FcTypeString, "sans",
                         FC_PIXEL_SIZE, FcTypeDouble, (double)font->size / PANGO_SCALE,
                         NULL);
  
  matched = FcFontMatch (NULL, sans, &result);
  
  if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
    goto bail1;
  
  if (FcPatternGetInteger (matched, FC_INDEX, 0, &id) != FcResultMatch)
    goto bail1;
  
  error = FT_New_Face (_pango_opengl_font_map_get_library (fcfont->fontmap),
                       (char *) filename2, id, &font->face);
  
  if (error)
    {
    bail1:
      name = pango_font_description_to_string (fcfont->description);
      g_warning ("Unable to open font file %s for font %s, exiting\n", filename2, name);
      exit (1);
    }
  else
    {
      name = pango_font_description_to_string (fcfont->description);
      g_warning ("Unable to open font file %s for font %s, falling back to %s\n", original_file, name, filename2);
      g_free (name);
    }

  FcPatternDestroy (sans);
  FcPatternDestroy (matched);
}

static void
set_transform (PangoOpenGLFont *font)
{
  PangoFcFont *fcfont = (PangoFcFont *)font;
  FcMatrix *fc_matrix;

  if (FcPatternGetMatrix (fcfont->font_pattern, FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
    {
      FT_Matrix ft_matrix;
      
      ft_matrix.xx = 0x10000L * fc_matrix->xx;
      ft_matrix.yy = 0x10000L * fc_matrix->yy;
      ft_matrix.xy = 0x10000L * fc_matrix->xy;
      ft_matrix.yx = 0x10000L * fc_matrix->yx;

      FT_Set_Transform (font->face, &ft_matrix, NULL);
    }
}

FT_Face
pango_opengl_font_get_face (PangoFont *font)
{
  PangoOpenGLFont *glfont = (PangoOpenGLFont *)font;
  PangoFcFont *fcfont = (PangoFcFont *)font;
  FT_Error error;
  FcPattern *pattern;
  FcChar8 *filename;
  FcBool antialias, hinting, autohint;
  int id;

  pattern = fcfont->font_pattern;

  if (!glfont->face)
    {
      glfont->load_flags = 0;

      /* disable antialiasing if requested */
      if (FcPatternGetBool (pattern, FC_ANTIALIAS, 0, &antialias) != FcResultMatch)
        antialias = FcTrue;

      glfont->load_flags |= FT_LOAD_NO_BITMAP;

      /* disable hinting if requested */
      if (FcPatternGetBool (pattern, FC_HINTING, 0, &hinting) != FcResultMatch)
        hinting = FcTrue;

      if (!hinting)
        glfont->load_flags |= FT_LOAD_NO_HINTING;

      /* force autohinting if requested */
      if (FcPatternGetBool (pattern, FC_AUTOHINT, 0, &autohint) != FcResultMatch)
        autohint = FcFalse;

      if (autohint)
        glfont->load_flags |= FT_LOAD_FORCE_AUTOHINT;

      if (FcPatternGetString (pattern, FC_FILE, 0, &filename) != FcResultMatch)
        goto bail0;
      
      if (FcPatternGetInteger (pattern, FC_INDEX, 0, &id) != FcResultMatch)
        goto bail0;

      error = FT_New_Face (_pango_opengl_font_map_get_library (fcfont->fontmap),
                           (char *)filename, id, &glfont->face);

      if (error != FT_Err_Ok)
        {
        bail0:
          load_fallback_face (glfont, (char *)filename);
        }

      g_assert (glfont->face);

      set_transform (glfont);

      error = FT_Set_Char_Size (glfont->face,
                                PANGO_PIXELS_26_6 (glfont->size),
                                PANGO_PIXELS_26_6 (glfont->size),
                                0, 0);
      if (error)
        g_warning ("Error in FT_Set_Char_Size: %d", error);
    }
  
  return glfont->face;
}

G_DEFINE_TYPE (PangoOpenGLFont, pango_opengl_font, PANGO_TYPE_FC_FONT)

static void 
pango_opengl_font_init (PangoOpenGLFont *font)
{
  font->face = NULL;
  font->size = 0;
  font->glyph_info = g_hash_table_new (NULL, NULL);
}

static void
pango_opengl_font_class_init (PangoOpenGLFontClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
  PangoFontClass *font_class = PANGO_FONT_CLASS (class);
  PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (class);
  
  object_class->finalize = pango_opengl_font_finalize;
  
  font_class->get_glyph_extents = pango_opengl_font_get_glyph_extents;
  
  fc_font_class->lock_face = pango_opengl_font_real_lock_face;
  fc_font_class->unlock_face = pango_opengl_font_real_unlock_face;
}

static PangoOpenGLGlyphInfo *
pango_opengl_font_get_glyph_info (PangoFont *font_, PangoGlyph glyph, gboolean create)
{
  PangoOpenGLFont *font = (PangoOpenGLFont *)font_;
  PangoFcFont *fcfont = (PangoFcFont *)font;
  PangoOpenGLGlyphInfo *info;

  info = g_hash_table_lookup (font->glyph_info, GUINT_TO_POINTER (glyph));

  if ((info == NULL) && create)
    {
      info = g_slice_new0 (PangoOpenGLGlyphInfo);

      pango_fc_font_get_raw_extents (fcfont, font->load_flags,
                                     glyph,
                                     &info->ink_rect,
                                     &info->logical_rect);

      g_hash_table_insert (font->glyph_info, GUINT_TO_POINTER(glyph), info);
    }

  return info;
}

PangoGlyph
pango_opengl_get_unknown_glyph (PangoFont *font)
{
  FT_Face face = pango_opengl_font_get_face (font);

  if (face && FT_IS_SFNT (face))
    /* TrueType fonts have an 'unknown glyph' box on glyph index 0 */
    return 0;
  else
    return PANGO_GLYPH_EMPTY;
}

static void
pango_opengl_font_get_glyph_extents (PangoFont      *font,
                                     PangoGlyph      glyph,
                                     PangoRectangle *ink_rect,
                                     PangoRectangle *logical_rect)
{
  PangoOpenGLGlyphInfo *info;

  if (glyph == PANGO_GLYPH_EMPTY)
    {
      if (ink_rect)
        ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
      if (logical_rect)
        logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
      return;
    }

  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
    {
      glyph = pango_opengl_get_unknown_glyph (font);
      if (glyph == PANGO_GLYPH_EMPTY)
        {
          /* No unknown glyph found for the font, draw a box */
          PangoFontMetrics *metrics = pango_font_get_metrics (font, NULL);

          if (metrics)
            {
              if (ink_rect)
                {
                  ink_rect->x = PANGO_SCALE;
                  ink_rect->width = metrics->approximate_char_width - 2 * PANGO_SCALE;
                  ink_rect->y = - (metrics->ascent - PANGO_SCALE);
                  ink_rect->height = metrics->ascent + metrics->descent - 2 * PANGO_SCALE;
                }
              if (logical_rect)
                {
                  logical_rect->x = 0;
                  logical_rect->width = metrics->approximate_char_width;
                  logical_rect->y = -metrics->ascent;
                  logical_rect->height = metrics->ascent + metrics->descent;
                }

              pango_font_metrics_unref (metrics);
            }
          else
            {
              if (ink_rect)
                ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
              if (logical_rect)
                logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
            }

          return;
        }
    }

  info = pango_opengl_font_get_glyph_info (font, glyph, TRUE);

  if (ink_rect)
    *ink_rect = info->ink_rect;
  if (logical_rect)
    *logical_rect = info->logical_rect;
}

int
pango_opengl_font_get_kerning (PangoFont *font,
                            PangoGlyph left,
                            PangoGlyph right)
{
  PangoFcFont *fc_font = PANGO_FC_FONT (font);
  
  FT_Face face;
  FT_Error error;
  FT_Vector kerning;

  face = pango_fc_font_lock_face (fc_font);
  if (!face)
    return 0;

  if (!FT_HAS_KERNING (face))
    {
      pango_fc_font_unlock_face (fc_font);
      return 0;
    }

  error = FT_Get_Kerning (face, left, right, ft_kerning_default, &kerning);
  if (error != FT_Err_Ok)
    {
      pango_fc_font_unlock_face (fc_font);
      return 0;
    }

  pango_fc_font_unlock_face (fc_font);
  return PANGO_UNITS_26_6 (kerning.x);
}

static FT_Face
pango_opengl_font_real_lock_face (PangoFcFont *font)
{
  return pango_opengl_font_get_face ((PangoFont *)font);
}

static void
pango_opengl_font_real_unlock_face (PangoFcFont *font)
{
}

static gboolean
pango_opengl_free_glyph_info_callback (gpointer key, gpointer value, gpointer data)
{
  PangoOpenGLFont *font = PANGO_OPENGL_FONT (data);
  PangoOpenGLGlyphInfo *info = value;
  
  if (font->glyph_cache_destroy && info->cached_glyph)
    (*font->glyph_cache_destroy) (info->cached_glyph);

  g_slice_free (PangoOpenGLGlyphInfo, info);
  return TRUE;
}

static void
pango_opengl_font_finalize (GObject *object)
{
  PangoOpenGLFont *font = (PangoOpenGLFont *)object;

  if (font->face)
    {
      FT_Done_Face (font->face);
      font->face = NULL;
    }

  g_hash_table_foreach_remove (font->glyph_info, pango_opengl_free_glyph_info_callback, object);
  g_hash_table_destroy (font->glyph_info);
  
  G_OBJECT_CLASS (pango_opengl_font_parent_class)->finalize (object);
}

PangoCoverage *
pango_opengl_font_get_coverage (PangoFont *font, PangoLanguage *language)
{
  return pango_font_get_coverage (font, language);
}

void *
_pango_opengl_font_get_cache_glyph_data (PangoFont *font, int glyph_index)
{
  PangoOpenGLGlyphInfo *info = pango_opengl_font_get_glyph_info (font, glyph_index, FALSE);

  return info ? info->cached_glyph : 0;
}

void
_pango_opengl_font_set_cache_glyph_data (PangoFont *font, int glyph_index, void *cached_glyph)
{
  PangoOpenGLGlyphInfo *info = pango_opengl_font_get_glyph_info (font, glyph_index, TRUE);
  info->cached_glyph = cached_glyph;
}

void
_pango_opengl_font_set_glyph_cache_destroy (PangoFont *font, GDestroyNotify destroy_notify)
{
  PANGO_OPENGL_FONT (font)->glyph_cache_destroy = destroy_notify;
}
Revision:	1.3
Committed:	Sun Apr 5 19:28:54 2009 UTC (15 years, 1 month ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+6 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/* Pango
2			* OpenGL Freetype2 handling
3			*
4			* Copyright (C) 1999 Red Hat Software
5			* Copyright (C) 2000 Tor Lillqvist
6			* Copyright (C) 2006 Marc Lehmann <pcg@goof.com>
7			*
8			* This file is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Library General Public
10			* License as published by the Free Software Foundation; either
11			* version 2 of the License, or (at your option) any later version.
12			*
13			* This file is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Library General Public License for more details.
17			*
18			* You should have received a copy of the GNU Library General Public
19			* License along with this library; if not, write to the
20			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21			* Boston, MA 02111-1307, USA.
22			*/
23
24			#define PANGO_ENABLE_BACKEND
25
26			#include <string.h>
27			#include <stdlib.h>
28			#include <math.h>
29			#include <glib.h>
30			#include <glib/gprintf.h>
31
32			#include "pangoopengl.h"
33
34			#include "pango/pangofc-font.h"
35			#include "pango/pangofc-fontmap.h"
36
37			#define PANGO_OPENGL_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_OPENGL_FONT, PangoOpenGLFontClass))
38			#define PANGO_OPENGL_IS_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_OPENGL_FONT))
39			#define PANGO_OPENGL_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_OPENGL_FONT, PangoOpenGLFontClass))
40
41			typedef struct _PangoOpenGLFontClass PangoOpenGLFontClass;
42
43			struct _PangoOpenGLFontClass
44			{
45			PangoFcFontClass parent_class;
46			};
47
48			static void pango_opengl_font_finalize (GObject *object);
49
50			static void pango_opengl_font_get_glyph_extents (PangoFont *font,
51			PangoGlyph glyph,
52			PangoRectangle *ink_rect,
53			PangoRectangle *logical_rect);
54
55			static FT_Face pango_opengl_font_real_lock_face (PangoFcFont *font);
56			static void pango_opengl_font_real_unlock_face (PangoFcFont *font);
57
58			PangoOpenGLFont *
59			_pango_opengl_font_new (PangoOpenGLFontMap fontmap_, FcPattern pattern)
60			{
61			PangoFontMap *fontmap = PANGO_FONT_MAP (fontmap_);
62			PangoOpenGLFont *font;
63			double d;
64
65			g_return_val_if_fail (fontmap != NULL, NULL);
66			g_return_val_if_fail (pattern != NULL, NULL);
67
68			font = (PangoOpenGLFont *)g_object_new (PANGO_TYPE_OPENGL_FONT,
69			"pattern", pattern,
70			NULL);
71
72			if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &d) == FcResultMatch)
73			font->size = d * PANGO_SCALE;
74
75	root	1.3	/* pango 1.24 is ABI-incompatible with 1.22, but distros */
76			/* usually package it under the same name, so a runtime check */
77			/* is required */
78			if (pango_version () > PANGO_VERSION_ENCODE (1, 23, 0))
79			PANGO_FC_FONT (font)->fontmap = fontmap;
80
81	root	1.1	return font;
82			}
83
84			static void
85			load_fallback_face (PangoOpenGLFont font, const char original_file)
86			{
87			PangoFcFont *fcfont = PANGO_FC_FONT (font);
88			FcPattern *sans;
89			FcPattern *matched;
90			FcResult result;
91			FT_Error error;
92			FcChar8 *filename2 = NULL;
93			gchar *name;
94			int id;
95
96			sans = FcPatternBuild (NULL,
97			FC_FAMILY, FcTypeString, "sans",
98			FC_PIXEL_SIZE, FcTypeDouble, (double)font->size / PANGO_SCALE,
99			NULL);
100
101			matched = FcFontMatch (NULL, sans, &result);
102
103			if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
104			goto bail1;
105
106			if (FcPatternGetInteger (matched, FC_INDEX, 0, &id) != FcResultMatch)
107			goto bail1;
108
109			error = FT_New_Face (_pango_opengl_font_map_get_library (fcfont->fontmap),
110			(char *) filename2, id, &font->face);
111
112			if (error)
113			{
114			bail1:
115			name = pango_font_description_to_string (fcfont->description);
116			g_warning ("Unable to open font file %s for font %s, exiting\n", filename2, name);
117			exit (1);
118			}
119			else
120			{
121			name = pango_font_description_to_string (fcfont->description);
122			g_warning ("Unable to open font file %s for font %s, falling back to %s\n", original_file, name, filename2);
123			g_free (name);
124			}
125
126			FcPatternDestroy (sans);
127			FcPatternDestroy (matched);
128			}
129
130			static void
131			set_transform (PangoOpenGLFont *font)
132			{
133			PangoFcFont fcfont = (PangoFcFont )font;
134			FcMatrix *fc_matrix;
135
136			if (FcPatternGetMatrix (fcfont->font_pattern, FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
137			{
138			FT_Matrix ft_matrix;
139
140			ft_matrix.xx = 0x10000L * fc_matrix->xx;
141			ft_matrix.yy = 0x10000L * fc_matrix->yy;
142			ft_matrix.xy = 0x10000L * fc_matrix->xy;
143			ft_matrix.yx = 0x10000L * fc_matrix->yx;
144
145			FT_Set_Transform (font->face, &ft_matrix, NULL);
146			}
147			}
148
149			FT_Face
150			pango_opengl_font_get_face (PangoFont *font)
151			{
152			PangoOpenGLFont glfont = (PangoOpenGLFont )font;
153			PangoFcFont fcfont = (PangoFcFont )font;
154			FT_Error error;
155			FcPattern *pattern;
156			FcChar8 *filename;
157			FcBool antialias, hinting, autohint;
158			int id;
159
160			pattern = fcfont->font_pattern;
161
162			if (!glfont->face)
163			{
164			glfont->load_flags = 0;
165
166			/* disable antialiasing if requested */
167			if (FcPatternGetBool (pattern, FC_ANTIALIAS, 0, &antialias) != FcResultMatch)
168			antialias = FcTrue;
169
170			glfont->load_flags \|= FT_LOAD_NO_BITMAP;
171
172			/* disable hinting if requested */
173			if (FcPatternGetBool (pattern, FC_HINTING, 0, &hinting) != FcResultMatch)
174			hinting = FcTrue;
175
176			if (!hinting)
177			glfont->load_flags \|= FT_LOAD_NO_HINTING;
178
179			/* force autohinting if requested */
180			if (FcPatternGetBool (pattern, FC_AUTOHINT, 0, &autohint) != FcResultMatch)
181			autohint = FcFalse;
182
183			if (autohint)
184			glfont->load_flags \|= FT_LOAD_FORCE_AUTOHINT;
185
186			if (FcPatternGetString (pattern, FC_FILE, 0, &filename) != FcResultMatch)
187			goto bail0;
188
189			if (FcPatternGetInteger (pattern, FC_INDEX, 0, &id) != FcResultMatch)
190			goto bail0;
191
192			error = FT_New_Face (_pango_opengl_font_map_get_library (fcfont->fontmap),
193			(char *)filename, id, &glfont->face);
194
195			if (error != FT_Err_Ok)
196			{
197			bail0:
198			load_fallback_face (glfont, (char *)filename);
199			}
200
201			g_assert (glfont->face);
202
203			set_transform (glfont);
204
205			error = FT_Set_Char_Size (glfont->face,
206			PANGO_PIXELS_26_6 (glfont->size),
207			PANGO_PIXELS_26_6 (glfont->size),
208			0, 0);
209			if (error)
210			g_warning ("Error in FT_Set_Char_Size: %d", error);
211			}
212
213			return glfont->face;
214			}
215
216			G_DEFINE_TYPE (PangoOpenGLFont, pango_opengl_font, PANGO_TYPE_FC_FONT)
217
218			static void
219			pango_opengl_font_init (PangoOpenGLFont *font)
220			{
221			font->face = NULL;
222			font->size = 0;
223			font->glyph_info = g_hash_table_new (NULL, NULL);
224			}
225
226			static void
227			pango_opengl_font_class_init (PangoOpenGLFontClass *class)
228			{
229			GObjectClass *object_class = G_OBJECT_CLASS (class);
230			PangoFontClass *font_class = PANGO_FONT_CLASS (class);
231			PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (class);
232
233			object_class->finalize = pango_opengl_font_finalize;
234
235			font_class->get_glyph_extents = pango_opengl_font_get_glyph_extents;
236
237			fc_font_class->lock_face = pango_opengl_font_real_lock_face;
238			fc_font_class->unlock_face = pango_opengl_font_real_unlock_face;
239			}
240
241			static PangoOpenGLGlyphInfo *
242			pango_opengl_font_get_glyph_info (PangoFont *font_, PangoGlyph glyph, gboolean create)
243			{
244			PangoOpenGLFont font = (PangoOpenGLFont )font_;
245			PangoFcFont fcfont = (PangoFcFont )font;
246			PangoOpenGLGlyphInfo *info;
247
248			info = g_hash_table_lookup (font->glyph_info, GUINT_TO_POINTER (glyph));
249
250			if ((info == NULL) && create)
251			{
252			info = g_slice_new0 (PangoOpenGLGlyphInfo);
253
254			pango_fc_font_get_raw_extents (fcfont, font->load_flags,
255			glyph,
256			&info->ink_rect,
257			&info->logical_rect);
258
259			g_hash_table_insert (font->glyph_info, GUINT_TO_POINTER(glyph), info);
260			}
261
262			return info;
263			}
264
265			PangoGlyph
266			pango_opengl_get_unknown_glyph (PangoFont *font)
267			{
268			FT_Face face = pango_opengl_font_get_face (font);
269
270			if (face && FT_IS_SFNT (face))
271			/* TrueType fonts have an 'unknown glyph' box on glyph index 0 */
272			return 0;
273			else
274			return PANGO_GLYPH_EMPTY;
275			}
276
277			static void
278			pango_opengl_font_get_glyph_extents (PangoFont *font,
279			PangoGlyph glyph,
280			PangoRectangle *ink_rect,
281			PangoRectangle *logical_rect)
282			{
283			PangoOpenGLGlyphInfo *info;
284
285			if (glyph == PANGO_GLYPH_EMPTY)
286			{
287			if (ink_rect)
288			ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
289			if (logical_rect)
290			logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
291			return;
292			}
293
294			if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
295			{
296			glyph = pango_opengl_get_unknown_glyph (font);
297			if (glyph == PANGO_GLYPH_EMPTY)
298			{
299			/* No unknown glyph found for the font, draw a box */
300			PangoFontMetrics *metrics = pango_font_get_metrics (font, NULL);
301
302			if (metrics)
303			{
304			if (ink_rect)
305			{
306			ink_rect->x = PANGO_SCALE;
307			ink_rect->width = metrics->approximate_char_width - 2 * PANGO_SCALE;
308			ink_rect->y = - (metrics->ascent - PANGO_SCALE);
309			ink_rect->height = metrics->ascent + metrics->descent - 2 * PANGO_SCALE;
310			}
311			if (logical_rect)
312			{
313			logical_rect->x = 0;
314			logical_rect->width = metrics->approximate_char_width;
315			logical_rect->y = -metrics->ascent;
316			logical_rect->height = metrics->ascent + metrics->descent;
317			}
318
319			pango_font_metrics_unref (metrics);
320			}
321			else
322			{
323			if (ink_rect)
324			ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
325			if (logical_rect)
326			logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
327			}
328
329			return;
330			}
331			}
332
333			info = pango_opengl_font_get_glyph_info (font, glyph, TRUE);
334
335			if (ink_rect)
336			*ink_rect = info->ink_rect;
337			if (logical_rect)
338			*logical_rect = info->logical_rect;
339			}
340
341			int
342			pango_opengl_font_get_kerning (PangoFont *font,
343			PangoGlyph left,
344			PangoGlyph right)
345			{
346			PangoFcFont *fc_font = PANGO_FC_FONT (font);
347
348			FT_Face face;
349			FT_Error error;
350			FT_Vector kerning;
351
352			face = pango_fc_font_lock_face (fc_font);
353			if (!face)
354			return 0;
355
356			if (!FT_HAS_KERNING (face))
357			{
358			pango_fc_font_unlock_face (fc_font);
359			return 0;
360			}
361
362			error = FT_Get_Kerning (face, left, right, ft_kerning_default, &kerning);
363			if (error != FT_Err_Ok)
364			{
365			pango_fc_font_unlock_face (fc_font);
366			return 0;
367			}
368
369			pango_fc_font_unlock_face (fc_font);
370			return PANGO_UNITS_26_6 (kerning.x);
371			}
372
373			static FT_Face
374			pango_opengl_font_real_lock_face (PangoFcFont *font)
375			{
376			return pango_opengl_font_get_face ((PangoFont *)font);
377			}
378
379			static void
380			pango_opengl_font_real_unlock_face (PangoFcFont *font)
381			{
382			}
383
384			static gboolean
385			pango_opengl_free_glyph_info_callback (gpointer key, gpointer value, gpointer data)
386			{
387			PangoOpenGLFont *font = PANGO_OPENGL_FONT (data);
388			PangoOpenGLGlyphInfo *info = value;
389
390			if (font->glyph_cache_destroy && info->cached_glyph)
391			(*font->glyph_cache_destroy) (info->cached_glyph);
392
393			g_slice_free (PangoOpenGLGlyphInfo, info);
394			return TRUE;
395			}
396
397			static void
398			pango_opengl_font_finalize (GObject *object)
399			{
400			PangoOpenGLFont font = (PangoOpenGLFont )object;
401
402			if (font->face)
403			{
404			FT_Done_Face (font->face);
405			font->face = NULL;
406			}
407
408			g_hash_table_foreach_remove (font->glyph_info, pango_opengl_free_glyph_info_callback, object);
409			g_hash_table_destroy (font->glyph_info);
410
411			G_OBJECT_CLASS (pango_opengl_font_parent_class)->finalize (object);
412			}
413
414			PangoCoverage *
415			pango_opengl_font_get_coverage (PangoFont font, PangoLanguage language)
416			{
417			return pango_font_get_coverage (font, language);
418			}
419
420			void *
421			_pango_opengl_font_get_cache_glyph_data (PangoFont *font, int glyph_index)
422			{
423			PangoOpenGLGlyphInfo *info = pango_opengl_font_get_glyph_info (font, glyph_index, FALSE);
424
425			return info ? info->cached_glyph : 0;
426			}
427
428			void
429			_pango_opengl_font_set_cache_glyph_data (PangoFont font, int glyph_index, void cached_glyph)
430			{
431			PangoOpenGLGlyphInfo *info = pango_opengl_font_get_glyph_info (font, glyph_index, TRUE);
432			info->cached_glyph = cached_glyph;
433			}
434
435			void
436			_pango_opengl_font_set_glyph_cache_destroy (PangoFont *font, GDestroyNotify destroy_notify)
437			{
438			PANGO_OPENGL_FONT (font)->glyph_cache_destroy = destroy_notify;
439			}