diff options
Diffstat (limited to 'pango/pangocairo-font.c')
| -rw-r--r-- | pango/pangocairo-font.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/pango/pangocairo-font.c b/pango/pangocairo-font.c index cfe9cb45..a49d14d4 100644 --- a/pango/pangocairo-font.c +++ b/pango/pangocairo-font.c @@ -185,6 +185,188 @@ _pango_cairo_font_install (PangoFont *font, return TRUE; } + +static int +max_glyph_width (PangoLayout *layout) +{ + int max_width = 0; + GSList *l, *r; + + for (l = pango_layout_get_lines_readonly (layout); l; l = l->next) + { + PangoLayoutLine *line = l->data; + + for (r = line->runs; r; r = r->next) + { + PangoGlyphString *glyphs = ((PangoGlyphItem *)r->data)->glyphs; + int i; + + for (i = 0; i < glyphs->num_glyphs; i++) + if (glyphs->glyphs[i].geometry.width > max_width) + max_width = glyphs->glyphs[i].geometry.width; + } + } + + return max_width; +} + +typedef struct _PangoCairoFontMetricsInfo +{ + const char *sample_str; + PangoFontMetrics *metrics; +} PangoCairoFontMetricsInfo; + +PangoFontMetrics * +_pango_cairo_font_get_metrics (PangoFont *font, + PangoLanguage *language) +{ + PangoCairoFont *cfont = (PangoCairoFont *) font; + PangoCairoFontPrivate *cf_priv = PANGO_CAIRO_FONT_PRIVATE (font); + PangoCairoFontMetricsInfo *info = NULL; /* Quiet gcc */ + GSList *tmp_list; + static int in_get_metrics; + + const char *sample_str = pango_language_get_sample_string (language); + + tmp_list = cf_priv->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) + { + PangoFontMap *fontmap; + PangoContext *context; + cairo_font_options_t *font_options; + PangoLayout *layout; + PangoRectangle extents; + PangoFontDescription *desc; + cairo_scaled_font_t *scaled_font; + cairo_matrix_t cairo_matrix; + PangoMatrix pango_matrix; + PangoMatrix identity = PANGO_MATRIX_INIT; + glong sample_str_width; + + int height, shift; + + /* XXX this is racy. need a ref'ing getter... */ + fontmap = pango_font_get_font_map (font); + if (!fontmap) + return pango_font_metrics_new (); + fontmap = g_object_ref (fontmap); + + info = g_slice_new0 (PangoCairoFontMetricsInfo); + + cf_priv->metrics_by_lang = g_slist_prepend (cf_priv->metrics_by_lang, info); + + info->sample_str = sample_str; + + scaled_font = _pango_cairo_font_private_get_scaled_font (cf_priv); + + context = pango_font_map_create_context (fontmap); + pango_context_set_language (context, language); + + font_options = cairo_font_options_create (); + cairo_scaled_font_get_font_options (scaled_font, font_options); + pango_cairo_context_set_font_options (context, font_options); + cairo_font_options_destroy (font_options); + + info->metrics = (* PANGO_CAIRO_FONT_GET_IFACE (font)->create_base_metrics_for_context) (cfont, context); + + /* We now need to adjust the base metrics for ctm */ + cairo_scaled_font_get_ctm (scaled_font, &cairo_matrix); + pango_matrix.xx = cairo_matrix.xx; + pango_matrix.yx = cairo_matrix.yx; + pango_matrix.xy = cairo_matrix.xy; + pango_matrix.yy = cairo_matrix.yy; + pango_matrix.x0 = 0; + pango_matrix.y0 = 0; + if (G_UNLIKELY (0 != memcmp (&identity, &pango_matrix, 4 * sizeof (double)))) + { + double xscale = pango_matrix_get_font_scale_factor (&pango_matrix); + if (xscale) xscale = 1 / xscale; + + info->metrics->ascent *= xscale; + info->metrics->descent *= xscale; + info->metrics->height *= xscale; + info->metrics->underline_position *= xscale; + info->metrics->underline_thickness *= xscale; + info->metrics->strikethrough_position *= xscale; + info->metrics->strikethrough_thickness *= xscale; + } + + /* Set the matrix on the context so we don't have to adjust the derived + * metrics. */ + pango_context_set_matrix (context, &pango_matrix); + + /* Ugly. We need to prevent recursion when we call into + * PangoLayout to determine approximate char width. + */ + if (!in_get_metrics) + { + in_get_metrics = 1; + + /* Update approximate_*_width now */ + layout = pango_layout_new (context); + desc = pango_font_describe_with_absolute_size (font); + pango_layout_set_font_description (layout, desc); + pango_font_description_free (desc); + + pango_layout_set_text (layout, sample_str, -1); + pango_layout_get_extents (layout, NULL, &extents); + + sample_str_width = pango_utf8_strwidth (sample_str); + g_assert (sample_str_width > 0); + info->metrics->approximate_char_width = extents.width / sample_str_width; + + pango_layout_set_text (layout, "0123456789", -1); + info->metrics->approximate_digit_width = max_glyph_width (layout); + + g_object_unref (layout); + in_get_metrics = 0; + } + + /* We may actually reuse ascent/descent we got from cairo here. that's + * in cf_priv->font_extents. + */ + height = info->metrics->ascent + info->metrics->descent; + switch (cf_priv->gravity) + { + default: + case PANGO_GRAVITY_AUTO: + case PANGO_GRAVITY_SOUTH: + break; + case PANGO_GRAVITY_NORTH: + info->metrics->ascent = info->metrics->descent; + break; + case PANGO_GRAVITY_EAST: + case PANGO_GRAVITY_WEST: + { + int ascent = height / 2; + if (cf_priv->is_hinted) + ascent = PANGO_UNITS_ROUND (ascent); + info->metrics->ascent = ascent; + } + } + shift = (height - info->metrics->ascent) - info->metrics->descent; + info->metrics->descent += shift; + info->metrics->underline_position -= shift; + info->metrics->strikethrough_position -= shift; + info->metrics->ascent = height - info->metrics->descent; + + g_object_unref (context); + g_object_unref (fontmap); + } + + return pango_font_metrics_ref (info->metrics); +} + static PangoCairoFontHexBoxInfo * _pango_cairo_font_private_get_hex_box_info (PangoCairoFontPrivate *cf_priv) { @@ -452,6 +634,14 @@ _pango_cairo_font_private_initialize (PangoCairoFontPrivate *cf_priv, cf_priv->scaled_font = NULL; cf_priv->hbi = NULL; cf_priv->glyph_extents_cache = NULL; + cf_priv->metrics_by_lang = NULL; +} + +static void +free_metrics_info (PangoCairoFontMetricsInfo *info) +{ + pango_font_metrics_unref (info->metrics); + g_slice_free (PangoCairoFontMetricsInfo, info); } void @@ -469,6 +659,10 @@ _pango_cairo_font_private_finalize (PangoCairoFontPrivate *cf_priv) if (cf_priv->glyph_extents_cache) g_free (cf_priv->glyph_extents_cache); cf_priv->glyph_extents_cache = NULL; + + g_slist_foreach (cf_priv->metrics_by_lang, (GFunc)free_metrics_info, NULL); + g_slist_free (cf_priv->metrics_by_lang); + cf_priv->metrics_by_lang = NULL; } gboolean |