font_loader.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#############################################################################
#
# OnAirScreen
# Copyright (c) 2012-2026 Sascha Ludwig, astrastudio.de
# All rights reserved.
#
# font_loader.py
# This file is part of OnAirScreen
#
# You may use this file under the terms of the BSD license as follows:
#
# "Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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#############################################################################

"""
Font Loader for OnAirScreen

This module handles loading fonts from the fonts directory.
"""

import logging
import os

from PyQt6.QtGui import QFontDatabase

logger = logging.getLogger(__name__)


def load_fonts() -> None:
    """
    Load fonts from the fonts/ directory
    
    Loads all font files from the fonts directory and registers them
    with Qt's font database for use throughout the application.
    """
    font_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "fonts")
    if os.path.exists(font_dir):
        font_files = [
            "FreeSans.otf",
            "FreeSansBold.otf",
            "FreeSansBoldOblique.otf",
            "FreeSansOblique.otf"
        ]
        for font_file in font_files:
            font_path = os.path.join(font_dir, font_file)
            if os.path.exists(font_path):
                font_id = QFontDatabase.addApplicationFont(font_path)
                if font_id != -1:
                    families = QFontDatabase.applicationFontFamilies(font_id)
                    logger.info(f"Loaded font: {font_file} -> {families}")
                else:
                    logger.warning(f"Failed to load font: {font_file}")