diff options
Diffstat (limited to 'pango/pangocairo-font.c')
| -rw-r--r-- | pango/pangocairo-font.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/pango/pangocairo-font.c b/pango/pangocairo-font.c index 259b45d9..37c7834f 100644 --- a/pango/pangocairo-font.c +++ b/pango/pangocairo-font.c @@ -72,3 +72,156 @@ _pango_cairo_font_install (PangoCairoFont *font, (* PANGO_CAIRO_FONT_GET_IFACE (font)->install) (font, cr); } + +cairo_font_face_t * +_pango_cairo_font_get_font_face (PangoCairoFont *font) +{ + g_return_val_if_fail (PANGO_IS_CAIRO_FONT (font), NULL); + + return (* PANGO_CAIRO_FONT_GET_IFACE (font)->get_font_face) (font); +} + +cairo_scaled_font_t * +_pango_cairo_font_get_scaled_font (PangoCairoFont *font) +{ + g_return_val_if_fail (PANGO_IS_CAIRO_FONT (font), NULL); + + return (* PANGO_CAIRO_FONT_GET_IFACE (font)->get_scaled_font) (font); +} + +static void +_pango_cairo_hex_box_info_destroy (PangoCairoHexBoxInfo *hbi) +{ + if (hbi) + { + g_object_unref (hbi->font); + g_slice_free (PangoCairoHexBoxInfo, hbi); + } +} + +PangoCairoHexBoxInfo * +_pango_cairo_get_hex_box_info (PangoCairoFont *cfont) +{ + static const char hexdigits[] = "0123456789ABCDEF"; + char c[2] = {0, 0}; + PangoFont *mini_font; + PangoCairoFont *mini_cfont; + PangoCairoHexBoxInfo *hbi; + int i; + double width = 0; + double height = 0; + cairo_font_extents_t font_extents; + PangoFontDescription *mini_desc, *desc; + cairo_scaled_font_t *scaled_font, *scaled_mini_font; + cairo_surface_t *surface; + cairo_t *cr; + + hbi = (PangoCairoHexBoxInfo *) g_object_get_data (G_OBJECT (cfont), "hex_box_info"); + if (hbi) + return hbi; + + + mini_desc = pango_font_description_new (); + desc = pango_font_describe ((PangoFont *)cfont); + + pango_font_description_set_family_static (mini_desc, "mono-space"); + + /* set size on mini_desc */ + { + int new_size; + new_size = pango_font_description_get_size (desc) / 2.4 + .9; + + if (pango_font_description_get_size_is_absolute (desc)) + pango_font_description_set_absolute_size (mini_desc, new_size); + else + pango_font_description_set_size (mini_desc, new_size); + } + + pango_font_description_free (desc); + + /* load mini_font */ + { + PangoContext *context; + PangoFontMap *fontmap; + + fontmap = pango_font_get_font_map ((PangoFont *)cfont); + g_assert (fontmap); + context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (fontmap)); + + pango_context_set_language (context, pango_language_from_string ("en")); + mini_font = pango_font_map_load_font (fontmap, context, mini_desc); + + g_object_unref (context); + g_object_unref (fontmap); + } + + pango_font_description_free (mini_desc); + + mini_cfont = (PangoCairoFont *) mini_font; + scaled_font = _pango_cairo_font_get_scaled_font (cfont); + scaled_mini_font = _pango_cairo_font_get_scaled_font (mini_cfont); + + surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 0, 0); + cr = cairo_create (surface); + _pango_cairo_font_install (mini_cfont, cr); + cairo_surface_destroy (surface); + + for (i = 0 ; i < 16 ; i++) + { + cairo_text_extents_t extents; + + c[0] = hexdigits[i]; + cairo_text_extents (cr, c, &extents); + width = MAX (width, extents.width); + height = MAX (height, extents.height); + } + + cairo_destroy (cr); + cairo_scaled_font_extents (scaled_font, &font_extents); + + hbi = g_slice_new (PangoCairoHexBoxInfo); + hbi->font = mini_font; + + hbi->digit_width = width; + hbi->digit_height = height; + + hbi->pad = hbi->digit_height / 8; + + hbi->box_height = 5 * hbi->pad + 2 * hbi->digit_height; + hbi->box_descent = font_extents.descent - + (font_extents.ascent + font_extents.descent - hbi->box_height) / 2; + + g_object_set_data_full (G_OBJECT (cfont), "hex_box_info", hbi, (GDestroyNotify)_pango_cairo_hex_box_info_destroy); + + return hbi; +} + +void +_pango_cairo_get_glyph_extents_missing (PangoCairoFont *cfont, + PangoGlyph glyph, + PangoRectangle *ink_rect, + PangoRectangle *logical_rect) +{ + PangoCairoHexBoxInfo *hbi; + gint cols; + + cols = (glyph & ~PANGO_CAIRO_UNKNOWN_FLAG) > 0xffff ? 3 : 2; + hbi = _pango_cairo_get_hex_box_info (cfont); + + if (ink_rect) + { + ink_rect->x = PANGO_SCALE * hbi->pad; + ink_rect->y = PANGO_SCALE * (hbi->box_descent - hbi->box_height); + ink_rect->width = PANGO_SCALE * (3 * hbi->pad + cols * (hbi->digit_width + hbi->pad)); + ink_rect->height = PANGO_SCALE * hbi->box_height; + } + + if (logical_rect) + { + logical_rect->x = 0; + logical_rect->y = PANGO_SCALE * (hbi->box_descent - (hbi->box_height + hbi->pad)); + logical_rect->width = PANGO_SCALE * (5 * hbi->pad + cols * (hbi->digit_width + hbi->pad)); + logical_rect->height = PANGO_SCALE * (hbi->box_height + 2 * hbi->pad); + } +} + |