SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.runtime.lcdui.font;

import cc.squirreljme.jvm.mle.constants.UIFontFlag;
import javax.microedition.lcdui.Font;

/**
 * This class provides static utility methods for fonts and otherwise.
 *
 * @since 2018/11/24
 */
public final class FontUtilities
{
    /**
     * Not used.
     *
     * @since 2018/11/24
     */
    private FontUtilities()
    {
    }
    
    /**
     * Converts a representation of the font to a system font ID.
     * 
     * @param __font The font to identify.
     * @return The identifier for the font.
     * @throws NullPointerException On null arguments.
     * @since 2020/11/14
     */
    public static int fontToSystemFont(Font __font)
        throws NullPointerException
    {
        if (__font == null)
            throw new NullPointerException("NARG");
        
        int id = 0;
        
        // Shift in size
        int size = __font.getPixelSize();
        id |= (size > UIFontFlag.PIXEL_SIZE_MASK ? UIFontFlag.PIXEL_SIZE_MASK :
            size);
        
        // Shift in font face
        switch (__font.getFace())
        {
            case Font.FACE_PROPORTIONAL:
                id |= UIFontFlag.FACE_PROPORTIONAL;
                break;
                
            case Font.FACE_MONOSPACE:
                id |= UIFontFlag.FACE_MONOSPACE;
                break;
            
            case Font.FACE_SYSTEM:
            default:
                id |= UIFontFlag.FACE_SYSTEM;
                break;
        }
        
        // Map font style
        int style = __font.getStyle();
        if ((style & Font.STYLE_ITALIC) != 0)
            id |= UIFontFlag.STYLE_ITALIC_FLAG;
        if ((style & Font.STYLE_BOLD) != 0)
            id |= UIFontFlag.STYLE_BOLD_FLAG;
        if ((style & Font.STYLE_UNDERLINED) != 0)
            id |= UIFontFlag.STYLE_UNDERLINED_FLAG;
        
        return id;
    }
    
    /**
     * Converts the logical font size to pixel size.
     *
     * @param __lsz The logical font size.
     * @return The pixel size.
     * @throws IllegalArgumentException If the logical font size is not valid.
     * @since 2018/11/24
     */
    @SuppressWarnings("MagicNumber")
    public static int logicalSizeToPixelSize(int __lsz)
        throws IllegalArgumentException
    {
        switch (__lsz)
        {
            case Font.SIZE_SMALL:
                return 8;
            
            case Font.SIZE_MEDIUM:
                return 12;
            
            case Font.SIZE_LARGE:
                return 16;
            
                /* {@squirreljme.error EB07 Invalid logical font size.} */
            default:
                throw new IllegalArgumentException("EB07");
        }
    }
    
    /**
     * Converts the pixel size to a logical font size.
     *
     * @param __psz The pixel font size.
     * @return The logical size.
     * @since 2018/11/24
     */
    public static int pixelSizeToLogicalSize(int __psz)
    {
        if (__psz < 10)
            return Font.SIZE_SMALL;
        else if (__psz < 14)
            return Font.SIZE_MEDIUM;
        return Font.SIZE_LARGE;
    }
}