Adaptive-Images for WordPress

This is not just the WordPress version of the original Adaptive-Images by Matt Wilcox. This is an extended version with which you can configure individually the responsive behavior of each image in the layout.

theme/config/adaptive-images-config.php

$setup = array(
  'banner' => array(
    'resolutions' => array(
      '0' => array(
        'w' => 480 // the image will have a physical width of 480px on screens with less then 480px width
      ),
      '480' => array(
        'w' => 768 // the image will have a physical width of 768px on screens with minimum 480px and less then 768px width
      ),
      '768' => array(
        'w' => 1024
      ),
      '1024' => array(
        'w' => 1200
       )
    )
   )
);

theme/page.php – or any other presentation file

// you simply can attach the behavior 'banner' to an image
<img src="image.jpg?size=banner">

// but using the get_adaptive_image() function is a much future proof solution
echo get_adaptive_image( array(
  'name' => 'banner', 
  'id' => {image-ID}, 
) );

Explanation: The key 'banner' in the array $setup is the name of an imageset, that holds all the configuration for the responsive behavior of an image, that is called with the name parameter 'banner' via the function get_adaptive_image().

More Options

jpg quality, sharpen, cropping by with an height or ratio, php image filters, retina display support

Requirements

• requires a current version of WordPress
• works on Multisites
• intended for use together with plugins like "Advanced-Custom-Fields"

Limitations

• may also works with inserting images in the wysiwyg-editor for now but not recommended

Dependencies

• Browser with JavaScript and Cookies enabled. JavaScript is needed for detecting the screens height and width. A Cookie is needed for temporarily storing the screens width and pixel density and making this data aviable in the adaptive-images script. There will be a fallback serving fix defined image sizes if JavaScript and/or Cookies are disabled.