Return if none of logical_rect or ink_rect is non-NULL.

2006-08-15  Behdad Esfahbod  <behdad@gnome.org>

        * pango/pango-layout.c (pango_layout_run_get_extents):
        * pango/glyphstring.c (pango_glyph_string_extents_range):
        Return if none of logical_rect or ink_rect is non-NULL.

        * pango/pango-item.h (PangoAnalysis): Add new member centered_baseline
        which if set, makes item rendered such that ascent == descent.

        * pango/pango-context.c (itemize_state_init),
        (itemize_state_add_character):
        * pango/pango-renderer.c (pango_renderer_draw_layout_line):
        Implement centered_baseline.

        * pango/pangocairo-fcfont.c (pango_cairo_fc_font_get_metrics): When
        adjusting ascent/descent for vertical fonts, adjust strikethrough and
        underline position too.

        * docs/tmpl/main.sgml: Document new struct member.

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