diff options
Diffstat (limited to 'pango/pangocairo-font.c')
| -rw-r--r-- | pango/pangocairo-font.c | 83 |
1 files changed, 81 insertions, 2 deletions
diff --git a/pango/pangocairo-font.c b/pango/pangocairo-font.c index 35da71ce..1f6382b8 100644 --- a/pango/pangocairo-font.c +++ b/pango/pangocairo-font.c @@ -22,6 +22,7 @@ #include "config.h" #include <math.h> +#include <string.h> #include "pangocairo.h" #include "pangocairo-private.h" @@ -206,6 +207,30 @@ _pango_cairo_font_install (PangoFont *font, } +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; @@ -239,6 +264,14 @@ _pango_cairo_font_get_metrics (PangoFont *font, 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; + int height, shift; /* XXX this is racy. need a ref'ing getter... */ @@ -253,14 +286,60 @@ _pango_cairo_font_get_metrics (PangoFont *font, 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 (_pango_cairo_font_private_get_scaled_font (cf_priv), font_options); + 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_metrics_for_context) (cfont, context); + 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->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); + + /* 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); + + info->metrics->approximate_char_width = extents.width / pango_utf8_strwidth (sample_str); + + pango_layout_set_text (layout, "0123456789", -1); + info->metrics->approximate_digit_width = max_glyph_width (layout); + + g_object_unref (layout); + /* We may actually reuse ascent/descent we got from cairo here. that's * in cf_priv->font_extents. |