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mutter/clutter/pango/pangoclutter-font.c
Tomas Frydrych 685c583d51 more fixed point work
2007-01-23 11:48:04 +00:00

475 lines
12 KiB
C
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/* Pango
* Clutter 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 "pangoclutter.h"
#include "pangoclutter-private.h"
#include <pango/pangofc-font.h>
#include <pango/pangofc-fontmap.h>
#define PANGO_CLUTTER_FONT_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), \
PANGO_TYPE_CLUTTER_FONT, \
PangoClutterFontClass))
#define PANGO_CLUTTER_IS_FONT_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_CLUTTER_FONT))
#define PANGO_CLUTTER_FONT_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), \
PANGO_TYPE_CLUTTER_FONT, \
PangoClutterFontClass))
typedef struct _PangoClutterFontClass PangoClutterFontClass;
struct _PangoClutterFontClass
{
PangoFcFontClass parent_class;
};
static void pango_clutter_font_finalize (GObject *object);
static void pango_clutter_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
static FT_Face pango_clutter_font_real_lock_face (PangoFcFont *font);
static void pango_clutter_font_real_unlock_face (PangoFcFont *font);
PangoClutterFont *
_pango_clutter_font_new (PangoClutterFontMap *fontmap_, FcPattern *pattern)
{
PangoFontMap *fontmap = PANGO_FONT_MAP (fontmap_);
PangoClutterFont *font;
double d;
g_return_val_if_fail (fontmap != NULL, NULL);
g_return_val_if_fail (pattern != NULL, NULL);
font = (PangoClutterFont *)g_object_new (PANGO_TYPE_CLUTTER_FONT,
"pattern", pattern,
NULL);
if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &d) == FcResultMatch)
{
/* Cannot use 16.16 fixed here, because multiplying by PANGO_SCALE
* could easily take us out of range, but we do not need the 16 bit
* precission for the fraction, so we use 20.12 fixed point here
*/
int f = CLUTTER_FLOAT_TO_FIXED (d) >> 4;
font->size = (f * PANGO_SCALE) >> 12;
}
return font;
}
static void
load_fallback_face (PangoClutterFont *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_clutter_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 (PangoClutterFont *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_clutter_font_get_face (PangoFont *font)
{
PangoClutterFont *glfont = (PangoClutterFont *)font;
PangoFcFont *fcfont = (PangoFcFont *)font;
FcPattern *pattern;
FcChar8 *filename;
FcBool antialias, hinting, autohint;
FT_Error error;
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_clutter_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 (PangoClutterFont, pango_clutter_font, PANGO_TYPE_FC_FONT)
static void
pango_clutter_font_init (PangoClutterFont *font)
{
font->face = NULL;
font->size = 0;
font->glyph_info = g_hash_table_new (NULL, NULL);
}
static void
pango_clutter_font_class_init (PangoClutterFontClass *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_clutter_font_finalize;
font_class->get_glyph_extents = pango_clutter_font_get_glyph_extents;
fc_font_class->lock_face = pango_clutter_font_real_lock_face;
fc_font_class->unlock_face = pango_clutter_font_real_unlock_face;
}
static PangoClutterGlyphInfo *
pango_clutter_font_get_glyph_info (PangoFont *font_,
PangoGlyph glyph,
gboolean create)
{
PangoClutterFont *font = (PangoClutterFont *)font_;
PangoFcFont *fcfont = (PangoFcFont *)font;
PangoClutterGlyphInfo *info;
info = g_hash_table_lookup (font->glyph_info, GUINT_TO_POINTER (glyph));
if ((info == NULL) && create)
{
info = g_slice_new0 (PangoClutterGlyphInfo);
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_clutter_get_unknown_glyph (PangoFont *font)
{
FT_Face face = pango_clutter_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_clutter_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
PangoClutterGlyphInfo *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_clutter_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_clutter_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_clutter_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_clutter_font_real_lock_face (PangoFcFont *font)
{
return pango_clutter_font_get_face ((PangoFont *)font);
}
static void
pango_clutter_font_real_unlock_face (PangoFcFont *font)
{
}
static gboolean
pango_clutter_free_glyph_info_callback (gpointer key,
gpointer value,
gpointer data)
{
PangoClutterFont *font = PANGO_CLUTTER_FONT (data);
PangoClutterGlyphInfo *info = value;
if (font->glyph_cache_destroy && info->cached_glyph)
(*font->glyph_cache_destroy) (info->cached_glyph);
g_slice_free (PangoClutterGlyphInfo, info);
return TRUE;
}
static void
pango_clutter_font_finalize (GObject *object)
{
PangoClutterFont *font = (PangoClutterFont *)object;
if (font->face)
{
FT_Done_Face (font->face);
font->face = NULL;
}
g_hash_table_foreach_remove (font->glyph_info,
pango_clutter_free_glyph_info_callback, object);
g_hash_table_destroy (font->glyph_info);
G_OBJECT_CLASS (pango_clutter_font_parent_class)->finalize (object);
}
PangoCoverage*
pango_clutter_font_get_coverage (PangoFont *font, PangoLanguage *language)
{
return pango_font_get_coverage (font, language);
}
void*
_pango_clutter_font_get_cache_glyph_data (PangoFont *font, int glyph_index)
{
PangoClutterGlyphInfo *info;
info = pango_clutter_font_get_glyph_info (font, glyph_index, FALSE);
return info ? info->cached_glyph : 0;
}
void
_pango_clutter_font_set_cache_glyph_data (PangoFont *font,
int glyph_index,
void *cached_glyph)
{
PangoClutterGlyphInfo *info;
info = pango_clutter_font_get_glyph_info (font, glyph_index, TRUE);
info->cached_glyph = cached_glyph;
}
void
_pango_clutter_font_set_glyph_cache_destroy (PangoFont *font,
GDestroyNotify destroy_notify)
{
PANGO_CLUTTER_FONT (font)->glyph_cache_destroy = destroy_notify;
}
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