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|
/* Pango
* pangocairofc-font.c: Cairo font handling, fontconfig backend
*
* Copyright (C) 2000-2005 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.
*/
#include <config.h>
#include <math.h>
#include <stdlib.h>
#include <cairo-ft.h>
#include "pango-fontmap.h"
#include "pangocairo-private.h"
#include "pangocairo-fc.h"
#include "pangofc-private.h"
#include "pango-utils.h"
#define PANGO_TYPE_CAIRO_FC_FONT (pango_cairo_fc_font_get_type ())
#define PANGO_CAIRO_FC_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFont))
#define PANGO_CAIRO_FC_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFontClass))
#define PANGO_CAIRO_IS_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_CAIRO_FC_FONT))
#define PANGO_CAIRO_FC_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFontClass))
typedef struct _PangoCairoFcFont PangoCairoFcFont;
typedef struct _PangoCairoFcFontClass PangoCairoFcFontClass;
typedef struct _GlyphExtentsCacheEntry GlyphExtentsCacheEntry;
typedef struct _GUnicharToGlyphCacheEntry GUnicharToGlyphCacheEntry;
/* define one of these to profile one of the caches */
#undef PROFILE_GLYPH_EXTENTS_CACHE
#undef PROFILE_CHAR_TO_GLYPH_CACHE
#undef PROFILE_GLYPH_CACHE
#ifdef PROFILE_GLYPH_EXTENTS_CACHE
# define PROFILE_GLYPH_CACHE GlyphExtentsCacheEntry
#endif
#ifdef PROFILE_CHAR_TO_GLYPH_CACHE
# define PROFILE_GLYPH_CACHE GUnicharToGlyphCacheEntry
#endif
#ifdef PROFILE_GLYPH_CACHE
static long num_cairo_fc_fonts;
static long max_cairo_fc_fonts;
static long num_glyph_caches;
static long max_glyph_caches;
static long num_glyph_cache_hits;
static long num_glyph_cache_misses;
#endif
#define GLYPH_CACHE_NUM_ENTRIES 256 /* should be power of two */
#define GLYPH_CACHE_MASK (GLYPH_CACHE_NUM_ENTRIES - 1)
/* An entry in the fixed-size cache for the gunichar -> glyph mapping.
* The cache is indexed by the lower N bits of the gunichar (see
* GLYPH_CACHE_NUM_ENTRIES). For scripts with few code points,
* this should provide pretty much instant lookups.
*
* The "ch" field is zero if that cache entry is invalid.
*/
struct _GUnicharToGlyphCacheEntry
{
gunichar ch;
PangoGlyph glyph;
};
/* An entry in the fixed-size cache for the glyph -> ink_rect mapping.
* The cache is indexed by the lower N bits of the glyph (see
* GLYPH_CACHE_NUM_ENTRIES). For scripts with few glyphs,
* this should provide pretty much instant lookups.
*/
struct _GlyphExtentsCacheEntry
{
PangoGlyph glyph;
int width;
PangoRectangle ink_rect;
};
struct _PangoCairoFcFont
{
PangoFcFont font;
cairo_font_face_t *font_face;
cairo_scaled_font_t *scaled_font;
cairo_matrix_t font_matrix;
cairo_matrix_t ctm;
cairo_font_options_t *options;
PangoRectangle font_extents;
GlyphExtentsCacheEntry *glyph_extents_cache;
GUnicharToGlyphCacheEntry *char_to_glyph_cache;
};
struct _PangoCairoFcFontClass
{
PangoFcFontClass parent_class;
};
GType pango_cairo_fc_font_get_type (void);
static cairo_font_face_t *pango_cairo_fc_font_get_font_face (PangoCairoFont *font);
/*******************************
* Utility functions *
*******************************/
static cairo_font_face_t *
pango_cairo_fc_font_get_font_face (PangoCairoFont *font)
{
PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (font);
PangoFcFont *fcfont = PANGO_FC_FONT (cffont);
if (!cffont->font_face)
{
cffont->font_face = cairo_ft_font_face_create_for_pattern (fcfont->font_pattern);
/* Failure of the above should only occur for out of memory,
* we can't proceed at that point
*/
if (!cffont->font_face)
g_error ("Unable to create FT2 cairo font face.\nThis means out of memory or a cairo/fontconfig/FreeType bug");
}
return cffont->font_face;
}
static cairo_scaled_font_t *
pango_cairo_fc_font_get_scaled_font (PangoCairoFont *font)
{
PangoCairoFcFont *cffont = (PangoCairoFcFont *)font;
if (!cffont->scaled_font)
{
cairo_font_face_t *font_face;
font_face = pango_cairo_fc_font_get_font_face (font);
cffont->scaled_font = cairo_scaled_font_create (font_face,
&cffont->font_matrix,
&cffont->ctm,
cffont->options);
/* Failure of the above should only occur for out of memory,
* we can't proceed at that point
*/
if (!cffont->scaled_font)
g_error ("Unable to create FT2 cairo scaled font.\nThis means out of memory or a cairo/fontconfig/FreeType bug");
}
return cffont->scaled_font;
}
/********************************
* Method implementations *
********************************/
static void
pango_cairo_fc_font_install (PangoCairoFont *font,
cairo_t *cr)
{
PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (font);
cairo_set_font_face (cr,
pango_cairo_fc_font_get_font_face (font));
cairo_set_font_matrix (cr, &cffont->font_matrix);
cairo_set_font_options (cr, cffont->options);
}
static void
cairo_font_iface_init (PangoCairoFontIface *iface)
{
iface->install = pango_cairo_fc_font_install;
iface->get_font_face = pango_cairo_fc_font_get_font_face;
iface->get_scaled_font = pango_cairo_fc_font_get_scaled_font;
}
G_DEFINE_TYPE_WITH_CODE (PangoCairoFcFont, pango_cairo_fc_font, PANGO_TYPE_FC_FONT,
{ G_IMPLEMENT_INTERFACE (PANGO_TYPE_CAIRO_FONT, cairo_font_iface_init) });
static void
pango_cairo_fc_font_finalize (GObject *object)
{
PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (object);
if (cffont->font_face)
cairo_font_face_destroy (cffont->font_face);
if (cffont->scaled_font)
cairo_scaled_font_destroy (cffont->scaled_font);
if (cffont->options)
cairo_font_options_destroy (cffont->options);
if (cffont->glyph_extents_cache)
{
g_free (cffont->glyph_extents_cache);
#ifdef PROFILE_GLYPH_EXTENTS_CACHE
num_glyph_caches--;
g_assert (num_glyph_caches >= 0);
#endif
}
if (cffont->char_to_glyph_cache)
{
g_free (cffont->char_to_glyph_cache);
#ifdef PROFILE_CHAR_TO_GLYPH_CACHE
num_glyph_caches--;
g_assert (num_glyph_caches >= 0);
#endif
}
G_OBJECT_CLASS (pango_cairo_fc_font_parent_class)->finalize (object);
#ifdef PROFILE_GLYPH_CACHE
num_cairo_fc_fonts--;
g_assert (num_cairo_fc_fonts >= 0);
#endif
}
/* This function is cut-and-pasted from pangocairo-fcfont.c - it might be
* better to add a virtual fcfont->create_context (font).
*/
static PangoFontMetrics *
pango_cairo_fc_font_get_metrics (PangoFont *font,
PangoLanguage *language)
{
PangoFcFont *fcfont = PANGO_FC_FONT (font);
PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (font);
PangoFcMetricsInfo *info = NULL; /* Quiet gcc */
GSList *tmp_list;
const char *sample_str = pango_language_get_sample_string (language);
tmp_list = fcfont->metrics_by_lang;
while (tmp_list)
{
info = tmp_list->data;
if (info->sample_str == sample_str) /* We _don't_ need strcmp */
break;
tmp_list = tmp_list->next;
}
if (!tmp_list)
{
PangoContext *context;
if (!fcfont->fontmap)
return pango_font_metrics_new ();
info = g_slice_new0 (PangoFcMetricsInfo);
fcfont->metrics_by_lang = g_slist_prepend (fcfont->metrics_by_lang, info);
info->sample_str = sample_str;
context = pango_fc_font_map_create_context (PANGO_FC_FONT_MAP (fcfont->fontmap));
pango_context_set_language (context, language);
pango_cairo_context_set_font_options (context, cffont->options);
info->metrics = pango_fc_font_create_metrics_for_context (fcfont, context);
g_object_unref (context);
}
return pango_font_metrics_ref (info->metrics);
}
static FT_Face
pango_cairo_fc_font_lock_face (PangoFcFont *font)
{
PangoCairoFont *cfont = (PangoCairoFont *)font;
cairo_scaled_font_t *scaled_font = pango_cairo_fc_font_get_scaled_font (cfont);
return cairo_ft_scaled_font_lock_face (scaled_font);
}
static void
pango_cairo_fc_font_unlock_face (PangoFcFont *font)
{
PangoCairoFont *cfont = (PangoCairoFont *)font;
cairo_scaled_font_t *scaled_font = pango_cairo_fc_font_get_scaled_font (cfont);
cairo_ft_scaled_font_unlock_face (scaled_font);
}
static PangoGlyph
pango_cairo_fc_font_get_glyph (PangoFcFont *font,
gunichar wc)
{
PangoCairoFcFont *cffont = (PangoCairoFcFont *)font;
guint idx;
GUnicharToGlyphCacheEntry *entry;
if (cffont->char_to_glyph_cache == NULL)
{
cffont->char_to_glyph_cache = g_new0 (GUnicharToGlyphCacheEntry, GLYPH_CACHE_NUM_ENTRIES);
/* Make sure all cache entries are invalid initially */
cffont->char_to_glyph_cache[0].ch = 1; /* char 1 cannot happen in bucket 0 */
#ifdef PROFILE_CHAR_TO_GLYPH_CACHE
num_glyph_caches++;
if (num_glyph_caches > max_glyph_caches)
max_glyph_caches = num_glyph_caches;
#endif
}
idx = wc & GLYPH_CACHE_MASK;
entry = cffont->char_to_glyph_cache + idx;
if (entry->ch != wc)
{
#ifdef PROFILE_CHAR_TO_GLYPH_CACHE
num_glyph_cache_misses++;
/*g_message ("cache MISS: cffont %p, gunichar %x = '%c'", cffont, wc, (wc < 128) ? wc : 0);*/
#endif
entry->ch = wc;
entry->glyph = ((PangoFcFontClass *) pango_cairo_fc_font_parent_class)->get_glyph (font, wc);
}
#ifdef PROFILE_CHAR_TO_GLYPH_CACHE
else
{
num_glyph_cache_hits++;
/*g_message ("cache HIT: cffont %p, gunichar %x = '%c'", cffont, wc, (wc < 128) ? wc : 0);*/
}
#endif
return entry->glyph;
}
static void
pango_cairo_fc_font_glyph_extents_cache_init (PangoCairoFcFont *cffont)
{
PangoCairoFont *cfont = (PangoCairoFont *)cffont;
cairo_scaled_font_t *scaled_font = pango_cairo_fc_font_get_scaled_font (cfont);
cairo_font_extents_t font_extents;
cairo_scaled_font_extents (scaled_font, &font_extents);
cffont->font_extents.x = 0;
cffont->font_extents.y = - font_extents.ascent * PANGO_SCALE;
cffont->font_extents.height = (font_extents.ascent + font_extents.descent) * PANGO_SCALE;
cffont->font_extents.width = 0;
cffont->glyph_extents_cache = g_new0 (GlyphExtentsCacheEntry, GLYPH_CACHE_NUM_ENTRIES);
/* Make sure all cache entries are invalid initially */
cffont->glyph_extents_cache[0].glyph = 1; /* glyph 1 cannot happen in bucket 0 */
#ifdef PROFILE_GLYPH_EXTENTS_CACHE
num_glyph_caches++;
if (num_glyph_caches > max_glyph_caches)
max_glyph_caches = num_glyph_caches;
#endif
}
/* Fills in the glyph extents cache entry
*/
static void
compute_glyph_extents (PangoCairoFcFont *cffont,
PangoGlyph glyph,
GlyphExtentsCacheEntry *entry)
{
cairo_text_extents_t extents;
cairo_glyph_t cairo_glyph;
cairo_glyph.index = glyph;
cairo_glyph.x = 0;
cairo_glyph.y = 0;
cairo_scaled_font_glyph_extents (cffont->scaled_font,
&cairo_glyph, 1, &extents);
entry->glyph = glyph;
entry->width = extents.x_advance * PANGO_SCALE;
entry->ink_rect.x = extents.x_bearing * PANGO_SCALE;
entry->ink_rect.y = extents.y_bearing * PANGO_SCALE;
entry->ink_rect.width = extents.width * PANGO_SCALE;
entry->ink_rect.height = extents.height * PANGO_SCALE;
}
static GlyphExtentsCacheEntry *
pango_cairo_fc_font_get_glyph_extents_cache_entry (PangoCairoFcFont *cffont,
PangoGlyph glyph)
{
GlyphExtentsCacheEntry *entry;
guint idx;
idx = glyph & GLYPH_CACHE_MASK;
entry = cffont->glyph_extents_cache + idx;
if (entry->glyph != glyph)
{
#ifdef PROFILE_GLYPH_EXTENTS_CACHE
num_glyph_cache_misses++;
/*g_message ("cache MISS: cffont %p, glyph %x", cffont, glyph);*/
#endif
compute_glyph_extents (cffont, glyph, entry);
}
#ifdef PROFILE_GLYPH_EXTENTS_CACHE
else
{
num_glyph_cache_hits++;
/*g_message ("cache HIT: cffont %p, glyph %x = '%c'", cffont, glyph);*/
}
#endif
return entry;
}
static void
pango_cairo_fc_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
PangoCairoFcFont *cffont = (PangoCairoFcFont *)font;
GlyphExtentsCacheEntry *entry;
/* We need to initialize the cache here, since we use cffont->font_extents
*/
if (cffont->glyph_extents_cache == NULL)
pango_cairo_fc_font_glyph_extents_cache_init (cffont);
if (glyph == PANGO_GLYPH_NULL)
{
if (ink_rect)
*ink_rect = cffont->font_extents;
if (logical_rect)
*logical_rect = cffont->font_extents;
return;
}
else if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
{
_pango_cairo_get_glyph_extents_missing((PangoCairoFont *)font, glyph, ink_rect, logical_rect);
return;
}
entry = pango_cairo_fc_font_get_glyph_extents_cache_entry (cffont, glyph);
if (ink_rect)
*ink_rect = entry->ink_rect;
if (logical_rect)
{
*logical_rect = cffont->font_extents;
logical_rect->width = entry->width;
}
}
static void
pango_cairo_fc_font_shutdown (PangoFcFont *fcfont)
{
PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (fcfont);
if (cffont->scaled_font)
{
cairo_scaled_font_destroy (cffont->scaled_font);
cffont->scaled_font = NULL;
}
if (cffont->font_face)
{
cairo_font_face_destroy (cffont->font_face);
cffont->font_face = NULL;
}
}
#ifdef PROFILE_GLYPH_CACHE
static void
profile_glyph_cache_exit_cb (void)
{
g_message ("Profiled %s cache", G_STRINGIFY (PROFILE_GLYPH_CACHE));
g_message ("Maximum number of PangoCairoFcFont objects: %ld", max_cairo_fc_fonts);
g_message ("Maximum number of glyph caches created: %ld (%ld KB)", max_glyph_caches, (max_glyph_caches * sizeof (PROFILE_GLYPH_CACHE) * GLYPH_CACHE_NUM_ENTRIES) / 1024);
g_message ("Glyph cache hits: %ld", num_glyph_cache_hits);
g_message ("Glyph cache misses: %ld", num_glyph_cache_misses);
g_message ("Glyph cache miss rate: %f%%", 100.0 * (double) num_glyph_cache_misses / (num_glyph_cache_misses + num_glyph_cache_hits));
}
#endif
static void
pango_cairo_fc_font_class_init (PangoCairoFcFontClass *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_cairo_fc_font_finalize;
font_class->get_glyph_extents = pango_cairo_fc_font_get_glyph_extents;
font_class->get_metrics = pango_cairo_fc_font_get_metrics;
fc_font_class->lock_face = pango_cairo_fc_font_lock_face;
fc_font_class->unlock_face = pango_cairo_fc_font_unlock_face;
fc_font_class->get_glyph = pango_cairo_fc_font_get_glyph;
fc_font_class->shutdown = pango_cairo_fc_font_shutdown;
#ifdef PROFILE_GLYPH_CACHE
atexit (profile_glyph_cache_exit_cb);
#endif
}
static void
pango_cairo_fc_font_init (PangoCairoFcFont *cffont)
{
#ifdef PROFILE_GLYPH_CACHE
num_cairo_fc_fonts++;
if (num_cairo_fc_fonts > max_cairo_fc_fonts)
max_cairo_fc_fonts = num_cairo_fc_fonts;
#endif
}
/********************
* Private API *
********************/
static double
get_font_size (PangoCairoFcFontMap *cffontmap,
PangoContext *context,
const PangoFontDescription *desc,
FcPattern *pattern,
const PangoMatrix *matrix)
{
double size;
/* The reason why we read FC_PIXEL_SIZE here rather than just
* using the specified size is to support operations like clamping
* a font to a minimal readable size in fonts.conf. This is pretty weird,
* since it could mean that changing the Cairo CTM doesn't change the
* font size, but it's just a more radical version of the non-linear
* font scaling we already have due to hinting and due to bitmap
* fonts being only available at a few sizes.
*
* If honoring FC_PIXEL_SIZE gets in the way of more useful features
* it should be removed since it only matters in the unusual case
* of people doing exotic stuff in fonts.conf.
*/
if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
return size * PANGO_SCALE / pango_matrix_get_font_scale_factor (matrix);
/* Just in case FC_PIXEL_SIZE got unset between pango_fc_make_pattern()
* and here.
*/
if (pango_font_description_get_size_is_absolute (desc))
return pango_font_description_get_size (desc);
else
{
double dpi = pango_cairo_context_get_resolution (context);
if (dpi <= 0)
dpi = cffontmap->dpi;
return dpi * pango_font_description_get_size (desc) / 72.;
}
}
PangoFcFont *
_pango_cairo_fc_font_new (PangoCairoFcFontMap *cffontmap,
PangoContext *context,
const PangoFontDescription *desc,
FcPattern *pattern)
{
PangoCairoFcFont *cffont;
const PangoMatrix *pango_ctm;
FcMatrix *fc_matrix;
double size;
g_return_val_if_fail (PANGO_IS_CAIRO_FC_FONT_MAP (cffontmap), NULL);
g_return_val_if_fail (pattern != NULL, NULL);
cffont = g_object_new (PANGO_TYPE_CAIRO_FC_FONT,
"pattern", pattern,
NULL);
if (FcPatternGetMatrix (pattern,
FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
{
cairo_matrix_init (&cffont->font_matrix,
fc_matrix->xx,
- fc_matrix->yx,
- fc_matrix->xy,
fc_matrix->yy,
0., 0.);
}
else
cairo_matrix_init_identity (&cffont->font_matrix);
pango_ctm = pango_context_get_matrix (context);
size = get_font_size (cffontmap, context, desc, pattern, pango_ctm);
cairo_matrix_scale (&cffont->font_matrix,
size / PANGO_SCALE, size / PANGO_SCALE);
if (pango_ctm)
cairo_matrix_init (&cffont->ctm,
pango_ctm->xx,
pango_ctm->yx,
pango_ctm->xy,
pango_ctm->yy,
0., 0.);
else
cairo_matrix_init_identity (&cffont->ctm);
cffont->options = cairo_font_options_copy (_pango_cairo_context_get_merged_font_options (context));
return PANGO_FC_FONT (cffont);
}
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