Utilising in my custom theme

Hey Jordy, Thanks for what’s looking like a top notch plugin.

After being a fool for a while (didn’t notice the 3.5 requirement on the latest build!), I have it up and generating the images nicely.

I’m using a custom built theme, which is grabbing images via the wp_get_attachment_image_src( $attachment->ID, 'large' ); function. This doesn’t appear to automagically grabbing the new retina images (I’m in debug mode / server side).

I think this is because I’m only linking to the images (where I then display larger versions in a colorbox).

Any ideas on how to trigger retina images here? (Do you have an ‘if retina’ function or some such?) Or should I be looking to change how I pull images from posts? I’m happy to have a dig around, but I’m not really sure where to begin here. So any ideas would be super welcome.

Here’s a full snippet of the code to generate the links:

$a_count = '0'; // count the number of attachments
	$attachments = get_posts( $pic_args );
	     if ( $attachments ) {
	        foreach ( $attachments as $attachment ) {
			$a_count++ ; //count for number of images
	 			$img_bits = wp_get_attachment_image_src( $attachment->ID, 'medium' );
	 			$img_lg = wp_get_attachment_image_src( $attachment->ID, 'large' );

				echo '<a href="'.$img_lg[0].'" id="' . $a_count .'"><img class="slide colorbox-' . $post->ID . '" src="' . $img_bits[0] .  '" height="100%" title="'. $attachment->post_excerpt .'"/></a>';

	          } //foreaech
	     } //if attachment	?>

http://wordpress.org/extend/plugins/wp-retina-2x/