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Merge branch 'issue-3050' of https://github.com/wmde/mapnik into wmde-issue-3050

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This commit is contained in:
artemp 2015-11-09 13:56:06 +00:00
commit 5370dac598
1 changed files with 39 additions and 10 deletions
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49
include/mapnik/text/harfbuzz_shaper.hpp
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@ -93,6 +93,19 @@ static void shape_text(text_line & line,
std::size_t pos = 0;
font_feature_settings const& ff_settings = text_item.format_->ff_settings;
int ff_count = safe_cast<int>(ff_settings.count());
// rendering information for a single glyph
struct glyph_face_info
{
face_ptr face;
hb_glyph_info_t glyph;
hb_glyph_position_t position;
};
// this table is filled with information for rendering each glyph, so that
// several font faces can be used in a single text_item
std::vector<glyph_face_info> glyphinfos;
unsigned valid_glyphs = 0;
for (auto const& face : *face_set)
{
++pos;
@ -112,20 +125,29 @@ static void shape_text(text_line & line,
unsigned num_glyphs = hb_buffer_get_length(buffer.get());
// if the number of rendered glyphs has increased, we need to resize the table
if (num_glyphs > glyphinfos.size())
{
glyphinfos.resize(num_glyphs);
}
hb_glyph_info_t *glyphs = hb_buffer_get_glyph_infos(buffer.get(), nullptr);
hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(buffer.get(), nullptr);
bool font_has_all_glyphs = true;
// Check if all glyphs are valid.
for (unsigned i=0; i<num_glyphs; ++i)
{
if (!glyphs[i].codepoint)
// if we have a valid codepoint, save rendering info.
if (glyphs[i].codepoint)
{
font_has_all_glyphs = false;
break;
if (!glyphinfos[i].glyph.codepoint)
{
++valid_glyphs;
}
glyphinfos[i] = { face, glyphs[i], positions[i] };
}
}
if (!font_has_all_glyphs && (pos < num_faces))
if (valid_glyphs < num_glyphs && (pos < num_faces))
{
//Try next font in fontset
continue;
@ -134,14 +156,21 @@ static void shape_text(text_line & line,
double max_glyph_height = 0;
for (unsigned i=0; i<num_glyphs; ++i)
{
auto const& gpos = positions[i];
auto const& glyph = glyphs[i];
auto& gpos = positions[i];
auto& glyph = glyphs[i];
face_ptr theface = face;
if (glyphinfos[i].glyph.codepoint)
{
gpos = glyphinfos[i].position;
glyph = glyphinfos[i].glyph;
theface = glyphinfos[i].face;
}
unsigned char_index = glyph.cluster;
glyph_info g(glyph.codepoint,char_index,text_item.format_);
if (face->glyph_dimensions(g))
if (theface->glyph_dimensions(g))
{
g.face = face;
g.scale_multiplier = size / face->get_face()->units_per_EM;
g.face = theface;
g.scale_multiplier = size / theface->get_face()->units_per_EM;
//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);