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#include <mbgl/text/font.hpp>
#include <harfbuzz/hb-ft.h>
#include <fstream>
#include <iostream>
#include <codecvt>
namespace mbgl {
Font::Font(const std::string &filename)
: filename_(filename),
font_(0),
buffer_(hb_buffer_create()) {
load();
}
Font::~Font() {
hb_buffer_destroy(buffer_);
hb_font_destroy(font_);
}
void Font::load() {
if (font_) return;
char *font_data;
unsigned int size;
std::ifstream file(filename_.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
if (file.is_open())
{
size = file.tellg();
font_data = new char[size];
file.seekg(0, std::ios::beg);
file.read(font_data, size);
file.close();
} else {
std::cerr << "Could not open font!\n";
return;
}
hb_blob_t *blob = hb_blob_create(font_data, size, HB_MEMORY_MODE_WRITABLE, font_data, [](void* data) {
delete[] static_cast<char*>(data);
});
hb_face_t *face = hb_face_create(blob, 0 /*face_index*/);
hb_blob_destroy(blob);
font_ = hb_font_create(face);
// TODO: Font size
upem_ = hb_face_get_upem(face);
hb_font_set_scale(font_, upem_, upem_);
hb_face_destroy(face);
hb_ft_font_set_funcs(font_);
}
Shaping Font::shape(const std::u32string &text, const float spacing, const vec2<float> &translate) {
Shaping shaping(translate.x * 24, translate.y * 24, text);
// TODO: the y offset *should* be part of the font metadata
// const int32_t yOffset = -17;
if (!font_) return shaping;
/*
std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> cv;
std::cout << cv.to_bytes(text) << std::endl;
*/
hb_buffer_reset(buffer_);
hb_buffer_add_utf32(buffer_, reinterpret_cast<const uint32_t*>(text.c_str()), text.length(), 0, text.length());
hb_buffer_set_direction(buffer_, HB_DIRECTION_RTL);
// hb_buffer_set_direction(buffer, hb_direction_from_string (direction, -1));
hb_buffer_set_script(buffer_, HB_SCRIPT_ARABIC);
// hb_buffer_set_script(buffer, hb_script_from_string (script, -1));
hb_buffer_set_language(buffer_, hb_language_from_string("ar", -1));
// hb_buffer_set_language(buffer, hb_language_from_string (language, -1));
hb_shape(font_, buffer_, 0 /*features*/, 0 /*num_features*/);
int num_glyphs = hb_buffer_get_length(buffer_);
hb_glyph_info_t *hb_glyph = hb_buffer_get_glyph_infos(buffer_, NULL);
hb_glyph_position_t *hb_position = hb_buffer_get_glyph_positions(buffer_, NULL);
// Loop through all characters of this label and shape.
for (int i = 0; i < num_glyphs; i++) {
uint32_t codepoint = hb_glyph[i].codepoint;
shaping.positionedGlyphs.emplace_back(codepoint,
hb_position[i].x_advance + spacing,
hb_position[i].y_advance);
/*
std::cout << "glyph codepoint:" << hb_glyph[i].codepoint <<
" cluster: " << hb_glyph[i].cluster <<
" mask: " << hb_glyph[i].mask <<
" x_advance: "<< hb_position[i].x_advance << "\n";
// " y_advance: "<< hb_position[i].y_advance <<
// " x_offset: "<< hb_position[i].x_offset <<
// " y_offset: "<< hb_position[i].y_offset << "\n";
// std::cout << "glyph:" << hb_glyph->codepoint << "\n";
*/
}
return shaping;
/*
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(), string.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());
// 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;
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());
// 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)
{
// if we have a valid codepoint, save rendering info.
if (glyphs[i].codepoint)
{
if (!glyphinfos[i].glyph.codepoint)
{
++valid_glyphs;
}
glyphinfos[i] = { face, glyphs[i], positions[i] };
}
}
if (valid_glyphs < num_glyphs && (pos < num_faces))
{
//Try next font in fontset
continue;
}
double max_glyph_height = 0;
for (unsigned i=0; i<num_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 (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);
break; //When we reach this point the current font had all glyphs.
}
}
*/
}
} // end namespace mbgl
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