diff options
Diffstat (limited to 'pango/pango-fontset.c')
| -rw-r--r-- | pango/pango-fontset.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/pango/pango-fontset.c b/pango/pango-fontset.c new file mode 100644 index 00000000..69f8003c --- /dev/null +++ b/pango/pango-fontset.c @@ -0,0 +1,356 @@ +/* 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. + */ + +/* + * PangoFontset + */ + +#include "pango-types.h" +#include "pango-font.h" +#include "pango-fontset.h" +#include "pango-utils.h" + +static void pango_fontset_class_init (PangoFontsetClass *class); +static PangoFontMetrics *pango_fontset_real_get_metrics (PangoFontset *fontset); + +GType +pango_fontset_get_type (void) +{ + static GType object_type = 0; + + if (!object_type) + { + static const GTypeInfo object_info = + { + sizeof (PangoFontsetClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) pango_fontset_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (PangoFontset), + 0, /* n_preallocs */ + NULL /* init */ + }; + + object_type = g_type_register_static (G_TYPE_OBJECT, + "PangoFontset", + &object_info, 0); + } + + return object_type; +} + +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 the + * unicode character wc. + * + * Returns: 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 (fontset != NULL, 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. + * + * Returns: a #PangoMetrics 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 (fontset != NULL, NULL); + + return PANGO_FONTSET_GET_CLASS (fontset)->get_metrics (fontset); +} + + +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); + + 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 = *raw_metrics; + 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++; + } + else + g_object_unref (font); + } + + p = g_utf8_next_char (p); + } + + g_hash_table_destroy (fonts_seen); + + 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_class_init (PangoFontsetSimpleClass *class); +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); + +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 */ + +PangoFontsetSimple * +pango_fontset_simple_new (PangoLanguage *language) +{ + PangoFontsetSimple *fontset; + + fontset = g_object_new (PANGO_TYPE_FONTSET_SIMPLE, NULL); + fontset->language = language; + + return fontset; +} + +GType +pango_fontset_simple_get_type (void) +{ + static GType object_type = 0; + + if (!object_type) + { + static const GTypeInfo object_info = + { + sizeof (PangoFontsetSimpleClass), + (GBaseInitFunc) NULL, + (GBaseFinalizeFunc) NULL, + (GClassInitFunc) pango_fontset_simple_class_init, + NULL, /* class_finalize */ + NULL, /* class_data */ + sizeof (PangoFontsetSimple), + 0, /* n_preallocs */ + (GInstanceInitFunc) pango_fontset_simple_init, + }; + + object_type = g_type_register_static (PANGO_TYPE_FONTSET, + "PangoFontsetSimple", + &object_info, 0); + } + + return object_type; +} + +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; +} + +static void +pango_fontset_simple_init (PangoFontsetSimple *fontset) +{ + fontset->fonts = g_ptr_array_new (); + fontset->coverages = g_ptr_array_new (); + fontset->language = NULL; +} + +static void +pango_fontset_simple_finalize (GObject *object) +{ + PangoFontsetSimple *fontset = PANGO_FONTSET_SIMPLE (object); + PangoCoverage *coverage; + 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); +} + +void +pango_fontset_simple_append (PangoFontsetSimple *fontset, + PangoFont *font) +{ + g_ptr_array_add (fontset->fonts, font); + g_ptr_array_add (fontset->coverages, NULL); +} + +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; + 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); +} |