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#include <mbgl/text/font.hpp>
#include <fstream>
#include <iostream>
#include <codecvt>
// freetype2
extern "C" {
#include FT_GLYPH_H
// #include FT_OUTLINE_H
}
namespace mbgl {
struct ft_library_guard {
ft_library_guard(FT_Library* lib) :
library_(lib) {}
~ft_library_guard()
{
if (library_) FT_Done_FreeType(*library_);
}
FT_Library* library_;
};
struct ft_glyph_guard {
ft_glyph_guard(FT_Glyph* glyph) :
glyph_(glyph) {}
~ft_glyph_guard()
{
if (glyph_) FT_Done_Glyph(*glyph_);
}
FT_Glyph* glyph_;
};
Font::Font(const std::string &filename)
: filename_(filename),
font_(0),
buffer_(hb_buffer_create()) {
load();
}
Font::~Font() {
/*
for (FT_Face ft_face : ft_faces) {
FT_Done_Face(ft_face);
}
*/
hb_buffer_destroy(buffer_);
hb_font_destroy(font_);
}
void Font::load() {
if (font_) return;
char *font_data;
size_t font_size;
std::ifstream file(filename_.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
if (file.is_open())
{
font_size = file.tellg();
font_data = new char[font_size];
file.seekg(0, std::ios::beg);
file.read(font_data, font_size);
file.close();
} else {
std::cerr << "Could not open font!\n";
return;
}
/* ------------------------------------------------------------------ */
FT_Library library = nullptr;
ft_library_guard library_guard(&library);
FT_Error error = FT_Init_FreeType(&library);
if (error) {
throw std::runtime_error("Could not open FreeType library");
}
FT_Face ft_face = 0;
size_t num_faces = 0;
for (size_t i = 0; ft_face == 0 || i < num_faces; ++i) {
FT_Error face_error = FT_New_Memory_Face(library, reinterpret_cast<const FT_Byte*>(font_data), static_cast<FT_Long>(font_size), i, &ft_face);
if (face_error) {
throw std::runtime_error("Could not open font file");
}
if (num_faces == 0) {
num_faces = ft_face->num_faces;
ft_faces.reserve(num_faces);
}
ft_faces.push_back(ft_face);
}
/* ------------------------------------------------------------------ */
hb_blob_t *blob = hb_blob_create(font_data, font_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);
// TOOD: currently hardcoded in node-fontnik
size = (FT_F26Dot6)(24 * (1<<6)) / (double)upem_;
hb_font_set_scale(font_, size, size);
hb_face_destroy(face);
hb_ft_font_set_funcs(font_);
}
Shaping Font::shape(const std::u32string &text, const float spacing, const vec2<float> &translate, const std::map<uint32_t, SDFGlyph> &sdfs) {
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;
float x = 0;
const float y = yOffset;
if (!font_) return shaping;
// TODO: itemize string here
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_LTR);
// hb_buffer_set_direction(buffer, hb_direction_from_string (direction, -1));
hb_buffer_set_script(buffer_, HB_SCRIPT_LATIN);
// hb_buffer_set_script(buffer, hb_script_from_string (script, -1));
hb_buffer_set_language(buffer_, hb_language_from_string("en", -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);
std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> cv;
std::cout << cv.to_bytes(text) <<
" num_glyphs: " << num_glyphs <<
" upem: " << upem_ <<
" size: " << size <<
" spacing: " << spacing << std::endl;
// Loop through all characters of this label and shape.
for (uint32_t chr : text) {
auto it = sdfs.find(chr);
if (it != sdfs.end()) {
std::cout << "chr: " << chr <<
" x_advance: "<< it->second.metrics.advance + spacing << std::endl;
shaping.positionedGlyphs.emplace_back(chr, x, y);
x += it->second.metrics.advance + spacing;
}
}
for (int i = 0; i < num_glyphs; i++) {
uint32_t glyph = 0;
hb_font_get_glyph(font_, hb_glyph[i].codepoint, 0, &glyph);
char* name = new char[128];
hb_font_glyph_to_string(font_, hb_glyph[i].codepoint, name, 128);
std::cout << "glyph_index: " << hb_glyph[i].codepoint <<
" name: " << name <<
" x_advance: "<< hb_position[i].x_advance <<
" cluster: " << hb_glyph[i].cluster <<
" mask: " << hb_glyph[i].mask <<
" x_advance: "<< hb_position[i].x_advance <<
" y_advance: "<< hb_position[i].y_advance <<
" x_offset: "<< hb_position[i].x_offset <<
" y_offset: "<< hb_position[i].y_offset << std::endl;
FT_ULong char_code;
FT_UInt glyph_index;
char_code = FT_Get_First_Char(ft_faces[0], &glyph_index);
std::cout << "char_code: " << char_code << std::endl;
/*
FT_UInt glyph_index = reinterpret_cast<FT_UInt>(hb_glyph[i].codepoint);
if (FT_Load_Glyph(ft_faces[0], glyph_index, FT_LOAD_NO_HINTING)) {
throw std::runtime_error("Failed to load glyph");
}
FT_Glyph ft_glyph = nullptr;
ft_glyph_guard glyph_guard(&ft_glyph);
if (FT_Get_Glyph(ft_faces[0]->glyph, &ft_glyph)) {
throw std::runtime_error("Failed to get glyph");
}
*/
}
return shaping;
}
} // end namespace mbgl
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