Ejemplo n.º 1
0
static void shape_text(text_line & line,
                       text_itemizer & itemizer,
                       std::map<unsigned,double> & width_map,
                       face_manager_freetype & font_manager,
                       double scale_factor)
{
    unsigned start = line.first_char();
    unsigned end = line.last_char();
    std::size_t length = end - start;
    if (!length) return;

    std::list<text_item> const& list = itemizer.itemize(start, end);

    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);
    hb_buffer_pre_allocate(buffer.get(), safe_cast<int>(length));
    mapnik::value_unicode_string const& text = itemizer.text();

    for (auto const& text_item : list)
    {
        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());
        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_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
            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(), 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)
                {
                    font_has_all_glyphs = false;
                    break;
                }
            }
            if (!font_has_all_glyphs && (pos < num_faces))
            {
                //Try next font in fontset
                continue;
            }

            double max_glyph_height = 0;
            for (unsigned i=0; i<num_glyphs; ++i)
            {
                auto const& gpos = positions[i];
                auto const& glyph = glyphs[i];
                unsigned char_index = glyph.cluster;
                glyph_info g(glyph.codepoint,char_index,text_item.format_);
                if (face->glyph_dimensions(g))
                {
                    g.face = face;
                    g.scale_multiplier = size / face->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);
            break; //When we reach this point the current font had all glyphs.
        }
    }
}
Ejemplo n.º 2
0
static void shape_text(text_line & line,
                       text_itemizer & itemizer,
                       std::map<unsigned,double> & width_map,
                       face_manager_freetype & font_manager,
                       double scale_factor )
{
    unsigned start = line.first_char();
    unsigned end = line.last_char();
    mapnik::value_unicode_string const& text = itemizer.text();
    size_t length = end - start;
    if (!length) return;
    line.reserve(length);
    std::list<text_item> const& list = itemizer.itemize(start, end);

    UErrorCode err = U_ZERO_ERROR;
    mapnik::value_unicode_string shaped;
    mapnik::value_unicode_string reordered;

    for (auto const& text_item : list)
    {
        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();
        for (auto const& face : *face_set)
        {
            UBiDi *bidi = ubidi_openSized(length, 0, &err);
            ubidi_setPara(bidi, text.getBuffer(), length, UBIDI_DEFAULT_LTR, 0, &err);
            ubidi_writeReordered(bidi, reordered.getBuffer(length),
                                 length, UBIDI_DO_MIRRORING, &err);
            ubidi_close(bidi);
            reordered.releaseBuffer(length);

            int32_t num_char = u_shapeArabic(reordered.getBuffer(), length,
                                             shaped.getBuffer(length), length,
                                             U_SHAPE_LETTERS_SHAPE | U_SHAPE_LENGTH_FIXED_SPACES_NEAR |
                                             U_SHAPE_TEXT_DIRECTION_VISUAL_LTR, &err);
            if (num_char < 0)
            {
                MAPNIK_LOG_ERROR(icu_shaper) << " u_shapeArabic returned negative num_char " << num_char;
            }
            std::size_t num_chars = static_cast<std::size_t>(num_char);
            shaped.releaseBuffer(length);
            bool shaped_status = true;
            if (U_SUCCESS(err) && (num_chars == length))
            {
                U_NAMESPACE_QUALIFIER StringCharacterIterator iter(shaped);
                unsigned i = 0;
                for (iter.setToStart(); iter.hasNext();)
                {
                    UChar ch = iter.nextPostInc();
                    glyph_info tmp;
                    tmp.offset.clear();
                    tmp.char_index = i;
                    tmp.glyph_index = FT_Get_Char_Index(face->get_face(), ch);
                    if (tmp.glyph_index == 0)
                    {
                        shaped_status = false;
                        break;
                    }
                    tmp.face = face;
                    tmp.format = text_item.format;
                    face->glyph_dimensions(tmp);
                    tmp.scale_multiplier = size / face->get_face()->units_per_EM;
                    width_map[i] += tmp.advance();
                    line.add_glyph(std::move(tmp), scale_factor);
                    ++i;
                }
            }
            if (!shaped_status) continue;
            line.update_max_char_height(face->get_char_height(size));
            return;
        }
    }
}