I have hunted down the problem. It is the _custom_background_cb
function in wp-includes/theme.php
file. on line 1272 the comment “A default has to be specified in style.css. It will not be printed here.”
Line 1272 is where the color is being retrieved:
$color = get_theme_mod( 'background_color' );
If we change that to:
$color = get_theme_mod( 'background_color', get_theme_support( 'custom-background', 'default-color' ) );
We can get a default color without the need to have it saved in theme_mod
. We can still override the color with a saved value.
So, I duplicated the callback into my own function and this is what is working:
add_action( 'after_setup_theme', 'theme_custom_background');
function theme_custom_background(){
$theme = genesis_get_option('bf_style_selection');
switch ($theme) {
case 'bf-blue':
$bg_color="def1fc";
$bg_image="header-bg-blue.gif";
break;
case 'bf-black':
$bg_color="dadada";
$bg_image="header-bg-black.gif";
break;
}
$defaults = array(
'default-image' => get_stylesheet_directory_uri().'/images/'.$bg_image,
'default-color' => $bg_color,
'default-repeat' => 'repeat-x',
'default-position-x' => 'top',
'wp-head-callback' => '_bf_custom_background_cb',
'admin-head-callback' => '',
'admin-preview-callback' => ''
);
add_theme_support( 'custom-background', $defaults);
}
function _bf_custom_background_cb() {
// $background is the saved custom image, or the default image.
$background = set_url_scheme( get_background_image() );
// $color is the saved custom color.
// Added second parameter to get_theme_mod() to get_theme_support() as we need default colors to show with needing to save.
$color = get_theme_mod( 'background_color', get_theme_support( 'custom-background', 'default-color' ) );
if ( ! $background && ! $color )
return;
$style = $color ? "background-color: #$color;" : '';
if ( $background ) {
$image = " background-image: url('$background');";
$repeat = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) );
if ( ! in_array( $repeat, array( 'no-repeat', 'repeat-x', 'repeat-y', 'repeat' ) ) )
$repeat="repeat";
$repeat = " background-repeat: $repeat;";
$position = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) );
if ( ! in_array( $position, array( 'center', 'right', 'left' ) ) )
$position = 'left';
$position = " background-position: top $position;";
$attachment = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) );
if ( ! in_array( $attachment, array( 'fixed', 'scroll' ) ) )
$attachment="scroll";
$attachment = " background-attachment: $attachment;";
$style .= $image . $repeat . $position . $attachment;
}
?>
<style type="text/css" id="custom-background-css">
body.custom-background { <?php echo trim( $style ); ?> }
</style>
<?php
}