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avoid division by zero (units_per_EM is set to 0 for bitmap fonts)

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This commit is contained in:
artemp 2017-02-28 15:01:46 +01:00
parent a6519c3f6b
commit 7c93514fbc
1 changed files with 6 additions and 1 deletions
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7
include/mapnik/text/harfbuzz_shaper.hpp
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@ -199,11 +199,16 @@ static void shape_text(text_line & line,
if (theface->glyph_dimensions(g))
{
g.face = theface;
g.scale_multiplier = size / theface->get_face()->units_per_EM;
g.scale_multiplier = theface->get_face()->units_per_EM > 0 ?
(size / theface->get_face()->units_per_EM) : (size / 2048.0) ;
//Overwrite default advance with better value provided by HarfBuzz
g.unscaled_advance = gpos.x_advance;
g.offset.set(gpos.x_offset * g.scale_multiplier, gpos.y_offset * g.scale_multiplier);
double tmp_height = g.height();
if (theface->is_color())
{
tmp_height = size;
}
if (tmp_height > max_glyph_height) max_glyph_height = tmp_height;
width_map[char_index] += g.advance();
line.add_glyph(std::move(g), scale_factor);