ParseFromAtlas = function (scene, fontName, textureKey, frameKey, xmlKey, xSpacing, ySpacing)
{
    var texture = scene.sys.textures.get(textureKey);
    var frame = texture.get(frameKey);
    var xml = scene.sys.cache.xml.get(xmlKey);

    if (frame && xml)
    {
        var data = ParseXMLBitmapFont(xml, frame, xSpacing, ySpacing, texture);

        scene.sys.cache.bitmapFont.add(fontName, { data: data, texture: textureKey, frame: frameKey, fromAtlas: true });

        return true;
    }
    else
    {
        return false;
    }
}
Parse an XML Bitmap Font from an Atlas.

Adds the parsed Bitmap Font data to the cache with the `fontName` key.

@function ParseFromAtlas
@since 3.0.0
@private

@param {Phaser.Scene} scene - The Scene to parse the Bitmap Font for.
@param {string} fontName - The key of the font to add to the Bitmap Font cache.
@param {string} textureKey - The key of the BitmapFont's texture.
@param {string} frameKey - The key of the BitmapFont texture's frame.
@param {string} xmlKey - The key of the XML data of the font to parse.
@param {number} [xSpacing] - The x-axis spacing to add between each letter.
@param {number} [ySpacing] - The y-axis spacing to add to the line height.

@return {boolean} Whether the parsing was successful or not.