mapnik/src/font_library.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2014 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

// mapnik
#include <mapnik/util/font_library.hpp>
#include <mapnik/text/face.hpp>

// stl
#include <cstdlib>

// freetype2
extern "C"
{
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_MODULE_H
}

namespace {

void* _Alloc_Func(FT_Memory memory, long size)
{
    return std::malloc(size);
}

void _Free_Func(FT_Memory memory, void *block)
{
    std::free(block);
}

void* _Realloc_Func(FT_Memory memory, long cur_size, long new_size, void* block)
{
    return std::realloc(block, new_size);
}

}

namespace mapnik {

namespace util {

    font_library::font_library()
      : library_(nullptr),
        memory_(new FT_MemoryRec_)
    {
        memory_->alloc = _Alloc_Func;
        memory_->free = _Free_Func;
        memory_->realloc = _Realloc_Func;
        FT_Error error = FT_New_Library(&*memory_, &library_);
        if (error) throw std::runtime_error("can not initalize FreeType2 library");
        FT_Add_Default_Modules(library_);
    }

    FT_Library font_library::get()
    {
        return library_;
    }

    face_ptr font_library::face_from_memory(const char * buffer,
                                            std::size_t size,
                                            int index)
    {
        FT_Face face;
        FT_Error error = FT_New_Memory_Face(library_,
                                            reinterpret_cast<FT_Byte const*>(buffer), // data
                                            static_cast<FT_Long>(size), // size
                                            index, // face index
                                            &face);
        if (!error) return std::make_shared<font_face>(face);
        return face_ptr();
    }

    font_library::~font_library()
    {
        FT_Done_Library(library_);
    }

} // end namespace util

} // end namespace mapnik