//========================================================================

//

// ft_util.cc

//

// FreeType helper functions.

//

// This file is licensed under the GPLv2 or later

//

// Copyright (C) 2022 Adrian Johnson <ajohnson@redneon.com>

//

//========================================================================

#include <cstdio>

#include "ft_utils.h"

#include "gfile.h"

#ifdef _WIN32

static unsigned long ft_stream_read(FT_Stream stream, unsigned long offset, unsigned char *buffer, unsigned long count)

{

    FILE *file = (FILE *)stream->descriptor.pointer;

    fseek(file, offset, SEEK_SET);

    return fread(buffer, 1, count, file);

}

static void ft_stream_close(FT_Stream stream)

{

    FILE *file = (FILE *)stream->descriptor.pointer;

    fclose(file);

    delete stream;

}

#endif

// Same as FT_New_Face() but handles UTF-8 filenames on Windows

FT_Error ft_new_face_from_file(FT_Library library, const char *filename_utf8, FT_Long face_index, FT_Face *aface)

{

#ifdef _WIN32

    FILE *file;

    long size;

    if (!filename_utf8)

        return FT_Err_Invalid_Argument;

    file = openFile(filename_utf8, "rb");

    if (!file)

        return FT_Err_Cannot_Open_Resource;

    fseek(file, 0, SEEK_END);

    size = ftell(file);

    rewind(file);

    if (size <= 0)

        return FT_Err_Cannot_Open_Stream;

    FT_StreamRec *stream = new FT_StreamRec;

    *stream = {};

    stream->size = size;

    stream->read = ft_stream_read;

    stream->close = ft_stream_close;

    stream->descriptor.pointer = file;

    FT_Open_Args args = {};

    args.flags = FT_OPEN_STREAM;

    args.stream = stream;

    return FT_Open_Face(library, &args, face_index, aface);

#else

    // On POSIX, FT_New_Face mmaps font files. If not Windows, prefer FT_New_Face over our stdio.h based FT_Open_Face.

    return FT_New_Face(library, filename_utf8, face_index, aface);

#endif

}