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alternative exaustive face fallback implementation ref #3534 #3559

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This commit is contained in:
artemp 2017-01-31 17:44:25 +01:00
parent df51f6087c
commit 755d178d20
1 changed files with 37 additions and 44 deletions
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81
include/mapnik/text/harfbuzz_shaper.hpp
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@ -80,17 +80,17 @@ static void shape_text(text_line & line,
line.reserve(length);
auto hb_buffer_deleter = [](hb_buffer_t * buffer) { hb_buffer_destroy(buffer);};
const std::unique_ptr<hb_buffer_t, decltype(hb_buffer_deleter)> buffer(hb_buffer_create(),hb_buffer_deleter);
const std::unique_ptr<hb_buffer_t, decltype(hb_buffer_deleter)> buffer(hb_buffer_create(), hb_buffer_deleter);
hb_buffer_pre_allocate(buffer.get(), safe_cast<int>(length));
mapnik::value_unicode_string const& text = itemizer.text();
for (auto const& text_item : list)
{
auto item_length = static_cast<int>(text_item.end - text_item.start);
face_set_ptr face_set = font_manager.get_face_set(text_item.format_->face_name, text_item.format_->fontset);
double size = text_item.format_->text_size * scale_factor;
face_set->set_unscaled_character_sizes();
std::size_t num_faces = face_set->size();
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());
@ -101,41 +101,37 @@ static void shape_text(text_line & line,
hb_glyph_info_t glyph;
hb_glyph_position_t position;
};
// this table is filled with information for rendering each glyph, so that
// 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;
int valid_glyphs = 0;
std::size_t pos = 0;
for (auto const& face : *face_set)
{
++pos;
hb_buffer_clear_contents(buffer.get());
hb_buffer_add_utf16(buffer.get(), uchar_to_utf16(text.getBuffer()), text.length(), text_item.start, static_cast<int>(text_item.end - text_item.start));
hb_buffer_set_direction(buffer.get(), (text_item.dir == UBIDI_RTL)?HB_DIRECTION_RTL:HB_DIRECTION_LTR);
hb_buffer_add_utf16(buffer.get(), uchar_to_utf16(text.getBuffer()), text.length(), text_item.start, item_length);
hb_buffer_set_direction(buffer.get(), (text_item.dir == UBIDI_RTL) ? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
hb_buffer_set_script(buffer.get(), _icu_script_to_script(text_item.script));
hb_font_t *font(hb_ft_font_create(face->get_face(), nullptr));
// https://github.com/mapnik/test-data-visual/pull/25
#if HB_VERSION_MAJOR > 0
#if HB_VERSION_ATLEAST(1, 0 , 5)
hb_ft_font_set_load_flags(font,FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
#endif
#endif
#if (HB_VERSION_MAJOR > 0 && HB_VERSION_ATLEAST(1, 0, 5))
hb_ft_font_set_load_flags(font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
#endif
hb_shape(font, buffer.get(), ff_settings.get_features(), ff_count);
hb_font_destroy(font);
unsigned num_glyphs = hb_buffer_get_length(buffer.get());
hb_glyph_info_t *glyphs = hb_buffer_get_glyph_infos(buffer.get(), &num_glyphs);
hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(buffer.get(), &num_glyphs);
// if the number of rendered glyphs has increased, we need to resize the table
// 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);
// Check if all glyphs are valid.
for (unsigned i=0; i<num_glyphs; ++i)
for (unsigned i = 0; i < num_glyphs; ++i)
{
// if we have a valid codepoint, save rendering info.
if (glyphs[i].codepoint)
@ -143,41 +139,38 @@ static void shape_text(text_line & line,
if (!glyphinfos[i].glyph.codepoint)
{
++valid_glyphs;
glyphinfos[i] = { face, glyphs[i], positions[i] };
}
glyphinfos[i] = { face, glyphs[i], positions[i] };
}
}
if (valid_glyphs < num_glyphs && (pos < num_faces))
if (valid_glyphs < item_length && (pos < num_faces))
{
//Try next font in fontset
continue;
}
double max_glyph_height = 0;
for (unsigned i=0; i<num_glyphs; ++i)
for (auto const& info : glyphinfos)
{
auto& gpos = positions[i];
auto& glyph = glyphs[i];
face_ptr theface = face;
if (glyphinfos[i].glyph.codepoint)
if (info.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 (theface->glyph_dimensions(g))
{
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);
double tmp_height = g.height();
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);
auto const& gpos = info.position;
auto const& glyph = info.glyph;
auto const& theface = info.face;
unsigned char_index = glyph.cluster;
glyph_info g(glyph.codepoint, char_index, text_item.format_);
if (theface->glyph_dimensions(g))
{
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);
double tmp_height = g.height();
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);
}
}
}
line.update_max_char_height(max_glyph_height);