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/* Pango
* pango-fontset.c:
*
* Copyright (C) 2001 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"
/**
* PangoFontset:
*
* A `PangoFontset` represents a set of `PangoFont` to use when rendering text.
*
* A `PangoFontset` is the result of resolving a `PangoFontDescription`
* against a particular `PangoContext`. It has operations for finding the
* component font for a particular Unicode character, and for finding a
* composite set of metrics for the entire fontset.
*
* To obtain a `PangoFontset`, use [method@Pango.Context.load_fontset] or
* [method@Pango.FontMap.load_fontset].
*/
#include "pango-fontset-private.h"
#include "pango-types.h"
#include "pango-font-metrics-private.h"
#include "pango-impl-utils.h"
static PangoFontMetrics *pango_fontset_real_get_metrics (PangoFontset *fontset);
G_DEFINE_ABSTRACT_TYPE (PangoFontset, pango_fontset, G_TYPE_OBJECT);
static void
pango_fontset_init (PangoFontset *self)
{
}
static void
pango_fontset_class_init (PangoFontsetClass *class)
{
class->get_metrics = pango_fontset_real_get_metrics;
}
/**
* pango_fontset_get_font:
* @fontset: a `PangoFontset`
* @wc: a Unicode character
*
* Returns the font in the fontset that contains the best
* glyph for a Unicode character.
*
* Return value: (transfer full): a `PangoFont`
*/
PangoFont *
pango_fontset_get_font (PangoFontset *fontset,
guint wc)
{
g_return_val_if_fail (PANGO_IS_FONTSET (fontset), NULL);
return PANGO_FONTSET_GET_CLASS (fontset)->get_font (fontset, wc);
}
/**
* pango_fontset_get_metrics:
* @fontset: a `PangoFontset`
*
* Get overall metric information for the fonts in the fontset.
*
* Return value: a `PangoFontMetrics` object
*/
PangoFontMetrics *
pango_fontset_get_metrics (PangoFontset *fontset)
{
g_return_val_if_fail (PANGO_IS_FONTSET (fontset), NULL);
return PANGO_FONTSET_GET_CLASS (fontset)->get_metrics (fontset);
}
/*< private >
* pango_fontset_get_language:
* @fontset: a `PangoFontset`
*
* Gets the language that the fontset was created for.
*
* Returns: the language that @fontset was created for
*/
PangoLanguage *
pango_fontset_get_language (PangoFontset *fontset)
{
g_return_val_if_fail (PANGO_IS_FONTSET (fontset), NULL);
return PANGO_FONTSET_GET_CLASS (fontset)->get_language (fontset);
}
/**
* pango_fontset_foreach:
* @fontset: a `PangoFontset`
* @func: (closure data) (scope call): Callback function
* @data: (closure): data to pass to the callback function
*
* Iterates through all the fonts in a fontset, calling @func for
* each one.
*
* If @func returns %TRUE, that stops the iteration.
*/
void
pango_fontset_foreach (PangoFontset *fontset,
PangoFontsetForeachFunc func,
gpointer data)
{
g_return_if_fail (PANGO_IS_FONTSET (fontset));
g_return_if_fail (func != NULL);
PANGO_FONTSET_GET_CLASS (fontset)->foreach (fontset, func, data);
}
static gboolean
get_first_metrics_foreach (PangoFontset *fontset,
PangoFont *font,
gpointer data)
{
PangoFontMetrics **fontset_metrics = data;
PangoLanguage *language = pango_fontset_get_language (fontset);
*fontset_metrics = pango_font_get_metrics (font, language);
return TRUE; /* Stops iteration */
}
static PangoFontMetrics *
pango_fontset_real_get_metrics (PangoFontset *fontset)
{
PangoFontMetrics *metrics, *raw_metrics;
const char *sample_str;
const char *p;
int count;
GHashTable *fonts_seen;
PangoFont *font;
PangoLanguage *language;
language = pango_fontset_get_language (fontset);
sample_str = pango_language_get_sample_string (language);
count = 0;
metrics = NULL;
fonts_seen = g_hash_table_new_full (NULL, NULL, g_object_unref, NULL);
/* Initialize the metrics from the first font in the fontset */
pango_fontset_foreach (fontset, get_first_metrics_foreach, &metrics);
p = sample_str;
while (*p)
{
gunichar wc = g_utf8_get_char (p);
font = pango_fontset_get_font (fontset, wc);
if (font)
{
if (g_hash_table_lookup (fonts_seen, font) == NULL)
{
raw_metrics = pango_font_get_metrics (font, language);
g_hash_table_insert (fonts_seen, font, font);
if (count == 0)
{
metrics->ascent = raw_metrics->ascent;
metrics->descent = raw_metrics->descent;
metrics->approximate_char_width = raw_metrics->approximate_char_width;
metrics->approximate_digit_width = raw_metrics->approximate_digit_width;
}
else
{
metrics->ascent = MAX (metrics->ascent, raw_metrics->ascent);
metrics->descent = MAX (metrics->descent, raw_metrics->descent);
metrics->approximate_char_width += raw_metrics->approximate_char_width;
metrics->approximate_digit_width += raw_metrics->approximate_digit_width;
}
count++;
pango_font_metrics_free (raw_metrics);
}
else
g_object_unref (font);
}
p = g_utf8_next_char (p);
}
g_hash_table_destroy (fonts_seen);
if (count)
{
metrics->approximate_char_width /= count;
metrics->approximate_digit_width /= count;
}
return metrics;
}
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