Combo Tiles

function adhere_tiles( &$image = array() )
{
    $nen = nen_ini();
    $result = '';

    if( $image[ 'rgb' ] !== false )
    {
        $image [ 'combo' ] = imagecreatefrombmp( $nen[ 'root' ]. 'tiles src data/rgb/'. $image[ 'filename' ]. '.bmp' );
    }
    elseif( $image[ 'mask' ] !== false )
    {
        $image [ 'combo' ] = imagecreatefrombmp( $nen[ 'root' ]. 'tiles src data/mask/'. $image[ 'filename' ]. '.bmp' );
    }
    else
    {
        $image [ 'combo' ] = false;
        return;
    }

    //adhere rgb/mask tiles into single layer png

    if( $image[ 'rgb' ] !== false )
    {
        $width[ 'rgb' ]  = imagesx( $image[ 'rgb' ] );
        $height[ 'rgb' ]  = imagesy( $image[ 'rgb' ] );
    }
    else
    {
        $width[ 'rgb' ]  = 0;
        $height[ 'rgb' ]  = 0;
    }

    if( $image[ 'mask' ] !== false )
    {
        $width[ 'mask' ]  = imagesx( $image[ 'mask' ] );
        $height[ 'mask' ]  = imagesy( $image[ 'mask' ] );
    }
    else
    {
        $width[ 'mask' ]  = 0;
        $height[ 'mask' ]  = 0;
    }

    if( $image[ 'combo' ] !== false )
    {
        $width[ 'combo' ]  = imagesx( $image[ 'combo' ] );
        $height[ 'combo' ]  = imagesy( $image[ 'combo' ] );
    }
    else
    {
        $width[ 'combo' ]  = 0;
        $height[ 'combo' ]  = 0;
    }

    if( $image[ 'combo' ] === false )
    {
        return;
    }

    $result.= '<img src="./tiles out data/combo/'.$image[ 'filename' ]. '.png">';

    //imagecolortransparent( $image[ 'combo' ], 0);

    /*
    $fg = imagecolorexactalpha(
        $image['mask'],
        $red,
        $green,
        $blue,
        $alpha
    );

    $bg = imagecolorallocatealpha(
        $image['combo'],
        0,
        0,
        0,
        127
    );
    */

    $row=0;
    $col=0;
    while( $row < $height['combo'] )
    {
        while( $col < $width['combo'] )
        {
            //pseudocode:

            //if pixel in $image['mask'] at ($cow,$row) is white:
                //set pixel in $image['combo'] at ($cow,$row) as fully transparent
            //else
                //set pixel in $image['combo'] at ($cow,$row) as pixel color in $image['rgb'] at ($cow,$row) with full opacity

            if($col = width$['combo'] - 1)
            {
                break;
            }
            $col++;
        }
        if($row = height$['combo'] - 1)
        {
            break;
        }
        $row++;
    }

    return $result;
}