[cairo] patch for checking overlapping of "space" glyphs

[Henry (Yu) Song - SISA]

If a glyph is a space, box.p1.x and box.p2.x == 0 or box.p1.y and box.p2.y == 0

Date:   Mon Mar 12 13:28:32 2012 -0700

    check for space situation

diff --git a/src/cairo-scaled-font.c b/src/cairo-scaled-font.c
index e32e975..eda1da4 100644
--- a/src/cairo-scaled-font.c
+++ b/src/cairo-scaled-font.c
@@ -2215,8 +2215,9 @@ _cairo_scaled_font_glyph_device_extents (cairo_scaled_font_t          *scaled_font,
                   y = _cairo_fixed_from_double (glyphs[i].y);
               y1 = y + scaled_glyph->bbox.p1.y;
               y2 = y + scaled_glyph->bbox.p2.y;
+

-              if (overlap == FALSE)
+             if (overlap == FALSE && ((y1 != y2) || (x1 != x2)))
                   overlap = _range_contains_glyph (&box, x1, y1, x2, y2);
                if (x1 < box.p1.x) box.p1.x = x1;
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