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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
+ */
+
+#include "pango-types.h"
+#include "pango-font.h"
+#include "pango-fontset.h"
+#include "pango-impl-utils.h"
+
+static PangoFontMetrics *pango_fontset_real_get_metrics (PangoFontset *fontset);
+
+static void
+pango_fontset_class_init (PangoFontsetClass *class)
+{
+ class->get_metrics = pango_fontset_real_get_metrics;
+}
+
+PANGO_DEFINE_TYPE_ABSTRACT (PangoFontset, pango_fontset,
+ pango_fontset_class_init, NULL, G_TYPE_OBJECT)
+
+/**
+ * pango_fontset_get_font:
+ * @fontset: a #PangoFontset
+ * @wc: a Unicode character
+ *
+ * Returns the font in the fontset that contains the best glyph for the
+ * Unicode character @wc.
+ *
+ * Return value: a #PangoFont. The caller must call g_object_unref when finished
+ * with the font.
+ **/
+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. The caller must call pango_font_metrics_unref()
+ * when finished using the 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);
+}
+
+/**
+ * pango_fontset_foreach:
+ * @fontset: a #PangoFontset
+ * @func: Callback function
+ * @data: 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.
+ *
+ * Since: 1.4
+ **/
+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_CLASS (fontset)->get_language (fontset);
+ PangoFontMetrics *font_metrics = pango_font_get_metrics (font, language);
+ guint save_ref_count;
+
+ /* Initialize the fontset metrics to metrics of the first font in the
+ * fontset; saving the refcount and restoring it is a bit of hack but avoids
+ * having to update this code for each metrics addition.
+ */
+ save_ref_count = fontset_metrics->ref_count;
+ *fontset_metrics = *font_metrics;
+ fontset_metrics->ref_count = save_ref_count;
+
+ pango_font_metrics_unref (font_metrics);
+
+ 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_CLASS (fontset)->get_language (fontset);
+ sample_str = pango_language_get_sample_string (language);
+
+ count = 0;
+ metrics = pango_font_metrics_new ();
+ 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_unref (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;
+}
+
+
+/*
+ * PangoFontsetSimple
+ */
+
+#define PANGO_FONTSET_SIMPLE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FONTSET_SIMPLE, PangoFontsetSimpleClass))
+#define PANGO_IS_FONTSET_SIMPLE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FONTSET_SIMPLE))
+#define PANGO_FONTSET_SIMPLE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FONTSET_SIMPLE, PangoFontsetSimpleClass))
+
+static void pango_fontset_simple_finalize (GObject *object);
+static void pango_fontset_simple_init (PangoFontsetSimple *fontset);
+static PangoFontMetrics *pango_fontset_simple_get_metrics (PangoFontset *fontset);
+static PangoLanguage * pango_fontset_simple_get_language (PangoFontset *fontset);
+static PangoFont * pango_fontset_simple_get_font (PangoFontset *fontset,
+ guint wc);
+static void pango_fontset_simple_foreach (PangoFontset *fontset,
+ PangoFontsetForeachFunc func,
+ gpointer data);
+
+struct _PangoFontsetSimple
+{
+ PangoFontset parent_instance;
+
+ GPtrArray *fonts;
+ GPtrArray *coverages;
+ PangoLanguage *language;
+};
+
+struct _PangoFontsetSimpleClass
+{
+ PangoFontsetClass parent_class;
+};
+
+static PangoFontsetClass *simple_parent_class; /* Parent class structure for PangoFontsetSimple */
+
+/**
+ * pango_fontset_simple_new:
+ * @language: a #PangoLanguage tag
+ *
+ * Creates a new #PangoFontsetSimple for the given language.
+ *
+ * Return value: the newly allocated #PangoFontsetSimple, which should
+ * be freed with g_object_unref().
+ **/
+PangoFontsetSimple *
+pango_fontset_simple_new (PangoLanguage *language)
+{
+ PangoFontsetSimple *fontset;
+
+ fontset = g_object_new (PANGO_TYPE_FONTSET_SIMPLE, NULL);
+ fontset->language = language;
+
+ return fontset;
+}
+
+static void
+pango_fontset_simple_class_init (PangoFontsetSimpleClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+ PangoFontsetClass *fontset_class = PANGO_FONTSET_CLASS (class);
+
+ simple_parent_class = g_type_class_peek_parent (class);
+
+ object_class->finalize = pango_fontset_simple_finalize;
+ fontset_class->get_font = pango_fontset_simple_get_font;
+ fontset_class->get_metrics = pango_fontset_simple_get_metrics;
+ fontset_class->get_language = pango_fontset_simple_get_language;
+ fontset_class->foreach = pango_fontset_simple_foreach;
+}
+
+static void
+pango_fontset_simple_init (PangoFontsetSimple *fontset)
+{
+ fontset->fonts = g_ptr_array_new ();
+ fontset->coverages = g_ptr_array_new ();
+ fontset->language = NULL;
+}
+
+PANGO_DEFINE_TYPE (PangoFontsetSimple, pango_fontset_simple,
+ pango_fontset_simple_class_init, pango_fontset_simple_init,
+ PANGO_TYPE_FONTSET)
+
+static void
+pango_fontset_simple_finalize (GObject *object)
+{
+ PangoFontsetSimple *fontset = PANGO_FONTSET_SIMPLE (object);
+ PangoCoverage *coverage;
+ unsigned int i;
+
+ for (i = 0; i < fontset->fonts->len; i++)
+ g_object_unref (g_ptr_array_index(fontset->fonts, i));
+
+ g_ptr_array_free (fontset->fonts, TRUE);
+
+ for (i = 0; i < fontset->coverages->len; i++)
+ {
+ coverage = g_ptr_array_index (fontset->coverages, i);
+ if (coverage)
+ pango_coverage_unref (coverage);
+ }
+
+ g_ptr_array_free (fontset->coverages, TRUE);
+
+ G_OBJECT_CLASS (simple_parent_class)->finalize (object);
+}
+
+/**
+ * pango_fontset_simple_append:
+ * @fontset: a #PangoFontsetSimple.
+ * @font: a #PangoFont.
+ *
+ * Adds a font to the fontset.
+ **/
+void
+pango_fontset_simple_append (PangoFontsetSimple *fontset,
+ PangoFont *font)
+{
+ g_ptr_array_add (fontset->fonts, font);
+ g_ptr_array_add (fontset->coverages, NULL);
+}
+
+/**
+ * pango_fontset_simple_size:
+ * @fontset: a #PangoFontsetSimple.
+ *
+ * Returns the number of fonts in the fontset.
+ *
+ * Return value: the size of @fontset.
+ **/
+int
+pango_fontset_simple_size (PangoFontsetSimple *fontset)
+{
+ return fontset->fonts->len;
+}
+
+static PangoLanguage *
+pango_fontset_simple_get_language (PangoFontset *fontset)
+{
+ PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
+
+ return simple->language;
+}
+
+static PangoFontMetrics *
+pango_fontset_simple_get_metrics (PangoFontset *fontset)
+{
+ PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
+
+ if (simple->fonts->len == 1)
+ return pango_font_get_metrics (PANGO_FONT (g_ptr_array_index(simple->fonts, 0)),
+ simple->language);
+
+ return PANGO_FONTSET_CLASS (simple_parent_class)->get_metrics (fontset);
+}
+
+static PangoFont *
+pango_fontset_simple_get_font (PangoFontset *fontset,
+ guint wc)
+{
+ PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
+ PangoCoverageLevel best_level = PANGO_COVERAGE_NONE;
+ PangoCoverageLevel level;
+ PangoFont *font;
+ PangoCoverage *coverage;
+ int result = -1;
+ unsigned int i;
+
+ for (i = 0; i < simple->fonts->len; i++)
+ {
+ coverage = g_ptr_array_index (simple->coverages, i);
+
+ if (coverage == NULL)
+ {
+ font = g_ptr_array_index (simple->fonts, i);
+
+ coverage = pango_font_get_coverage (font, simple->language);
+ g_ptr_array_index (simple->coverages, i) = coverage;
+ }
+
+ level = pango_coverage_get (coverage, wc);
+
+ if (result == -1 || level > best_level)
+ {
+ result = i;
+ best_level = level;
+ if (level == PANGO_COVERAGE_EXACT)
+ break;
+ }
+ }
+
+ font = g_ptr_array_index(simple->fonts, result);
+ return g_object_ref (font);
+}
+
+static void
+pango_fontset_simple_foreach (PangoFontset *fontset,
+ PangoFontsetForeachFunc func,
+ gpointer data)
+{
+ PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
+ unsigned int i;
+
+ for (i = 0; i < simple->fonts->len; i++)
+ {
+ if ((*func) (fontset,
+ g_ptr_array_index (simple->fonts, i),
+ data))
+ return;
+ }
+}
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