Part of Bug 135683 – Cache glyphstring extents

2006-07-08  Behdad Esfahbod  <behdad@gnome.org>

        Part of Bug 135683 – Cache glyphstring extents

        * docs/pango-sections.txt:
        * docs/tmpl/glyphs.sgml:
        * pango/pango.def:
        * pango/pango-glyph.h:
        * pango/glyphstring.c (pango_glyph_string_get_width): New function.
        Much faster than calling pango_glyph_string_extents and using
        logical_rect.width.

        * pango/pango-renderer.c (add_underline), (add_strikethrough),
        (pango_renderer_draw_layout_line): Use the new function for
        optimization.

1 files changed, 27 insertions, 0 deletions

diff --git a/pango/glyphstring.c b/pango/glyphstring.c
index c4c5c8cd..82770349 100644
--- a/pango/glyphstring.c
+++ b/pango/glyphstring.c
@@ -264,6 +264,33 @@ pango_glyph_string_extents (PangoGlyphString *glyphs,
 }
 
 /**
+ * pango_glyph_string_get_width:
+ * @glyphs:   a #PangoGlyphString
+ * @font:     a #PangoFont
+ * 
+ * Computes the logical width of the glyph string as can also be computed
+ * using pango_glyph_string_extents().  However, since this only computes the
+ * width, it's much faster.  This is in fact only a convenience function that
+ * computes the sum of geometry.width for each glyph in the @glyphs.
+ *
+ * Return value: the logical width of the glyph string.
+ *
+ * Since: 1.14
+ */
+int
+pango_glyph_string_get_width (PangoGlyphString *glyphs,
+			      PangoFont        *font)
+{
+  int i;
+  int width = 0;
+
+  for (i = 0; i < glyphs->num_glyphs; i++)
+    width += &glyphs->glyphs[i].geometry.width;
+
+  return width;
+}
+
+/**
  * pango_glyph_string_get_logical_widths:
  * @glyphs: a #PangoGlyphString
  * @text: the text corresponding to the glyphs