// vi:set ft=javascript ff=dos ts=4 sts=4 sw=4 et:

// ==PREPROCESSOR==
// @name "GetAlbumArtV2"
// @author "T.P Wang"
// ==/PREPROCESSOR==

// NOTE:
// It's not recommended to use this example because whole process will be blocked 
//  and waited before utils.GetAlbumArtV2() is finished.

AlbumArtId = {
    front: 0,
    back: 1,
    disc: 2,
    icon: 3
};

var g_img = null;
var ww = 0,
    wh = 0;

function on_paint(gr) {
    // Draw front cover, keep aspect-ratio
    if (g_img) {
        var scale = 0;
        var x = 0,
            y = 0;
        var scale_w = ww / g_img.Width;
        var scale_h = wh / g_img.Height;

        if (scale_w <= scale_h) {
            scale = scale_w;
            y = (wh - g_img.Height * scale) / 2;
        } else {
            scale = scale_h;
            x = (ww - g_img.Width * scale) / 2;
        }

        gr.DrawImage(g_img, x, y, g_img.Width * scale, g_img.Height * scale, 0, 0, g_img.Width, g_img.Height);
    }
}

function on_size() {
    ww = window.Width;
    wh = window.Height;
}

function get_album_art(metadb) {
    if (metadb)
    // Get front cover
    return utils.GetAlbumArtV2(metadb, AlbumArtId.front);
}

g_img = get_album_art(fb.GetNowPlaying());

function on_playback_new_track(metadb) {
    if (g_img) g_img.Dispose();
    g_img = get_album_art(metadb);
    window.Repaint();
}
