A convenience Symfony bundle tailored for current responsive images needs of the webfactory GmbH, without any claims on reusability outside of this scope. Ye be warned.

composer req webfactory/responsive-image-bundle

Activate the bundle, e.g. in src/bundles.php:

<?php
return [
    // ...
    Webfactory\ResponsiveImageBundle\WebfactoryResponsiveImageBundle::class => ['all' => true],
];

If you intend to use lazyloading for images (which is the default), require "lazysizes": "^5.3" in your /package.json.

responsiveImg(image, options) with:

• image: an array with the following keys:
  • url (mandatory): the URL of the image
  • alt (optional): the alternative text for the image. Defaults to empty string.
  • title (optional): the title text for the image. Defaults to empty string.
• options: an array with the following keys:
  • sizes (optional): a string that sets the sizes-Attribut. Defaults to auto, or to 100% if lazyloading is disabled and sizes is empty.
  • transformations_to_widths (optional): an object with thumbor transformation names as keys and image widths as values. Sets the srcset-Attribute, with the thumbor image URLs based on the given transformations as the source. Defaults to a srcset with keys from imagex_xxxs to image_xl respectively to values from 160w to 1600w.
  • class (optional): CSS classes to add to the image. Defaults to empty string.
  • data_attributes (optional): an iterable object with data-attribute names (= the part after data-) and values as key/value pairs. Defaults to empty string.
  • placeholder_filter: a string with the name of the thumbor transformation (i.e. image_lqip) which is added to the placeholder image when lazyloading the image. Should match the target dimensions of the image. A list of default transformations is provided with this bundle (see below) and can be overwritten / extended in the application configuration, e.g. the config.yml.
  • lazyload (optional): Use lazyloading. Defaults to true.
  • lqip (optional): Use the LQIP-method (original concept (2013), current popular LQIP options) of always loading a low-quality placeholder image. Defaults to true.
  • focal_point (optional): An object with x and y properties that contain integer values. This bundles exposes the focal point via CSS Custom Properties on <img>; those Custom Properties can be used to mark the area that should be cropped last when the image is cropped via object-fit. The project using this bundle needs to add object-position: var(--focal-x, center) var(--focal-y, top); or similar to the image styles. This will interpret the focal point if one was selected in the CMS or fall back to the comma-separated values (which can be any length or keyword that is valid for object-position).

Example:

{% import '@WebfactoryResponsiveImage/Macros/responsiveImg.html.twig' as rImg %}

{{ rImg.responsiveImg(
    {
        'url': s3_cachable_url(artist, 'photo'),
        'alt': 'Portrait of ' ~ artistEntity.name
    },
    {
        'sizes': '100vw',
        'transformations_to_widths': {
            'image_xxs': '320w',
            'image_md': '992w'
        },
        'data_attributes': {'credits': '© P. H. O'Tographer'},
    }
) }}

macro responsivePicture(formats, options) with:

• formats: Array of objects, with each object describing a different format variant of the motive/picture by the following keys:
  • image_url (mandatory): the URL of the image in this format
  • options (optional): an array with the following keys that parametrize this format variant:
    • sizes (optional): a string that sets the sizes-Attribut. Defaults to auto, or to 100% if lazyloading is disabled and sizes is empty.
    • transformations_to_widths (optional): an object with thumbor transformation names as keys and image widths as values. Sets the srcset-Attribute, with the thumbor image URLs based on the given transformations as the source. Defaults to a srcset with keys from imagex_xxxs to image_xl respectively to values from 160w to 1600w.
    • media_query (optional): a string that sets the media query for the source element
• options: an array with the following keys:
  • class: Optional class to add to the img-tag. Defaults to empty class attribute is no value is given to keep the code readable.
  • alt (optional): the alternative text for the image. Defaults to empty string.
  • title (optional): the title text for the image. Defaults to empty string.
  • data_attributes (optional): an iterable object with data-attribute names (= the part after data-) and values as key/value pairs.
  • placeholder_filter: a string with the name of the thumbor transformation (i.e. image_lqip) which is added to the placeholder image when lazyloading the image. Should match the target dimensions of the image. A list of default transformations is provided with this bundle (see below) and can be overwritten / extended in the application configuration, e.g. the config.yml.
  • lazyload (optional): Use lazyloading. Defaults to true.
  • lqip (optional): Use the LQIP-method (original concept (2013), current popular LQIP options) of always loading a low-quality placeholder image. Defaults to true.
  • focal_point (optional): An object with x and y properties that contain integer values. This bundles exposes the focal point via CSS Custom Properties on <img>; those Custom Properties can be used to mark the area that should be cropped last when the image is cropped via object-fit. The project using this bundle needs to add object-position: var(--focal-x, center) var(--focal-y, top); or similar to the image styles. This will interpret the focal point if one was selected in the CMS or fall back to the comma-separated values (which can be any length or keyword that is valid for object-position).

Example:

{% import '@WebfactoryResponsiveImage/Macros/responsiveImg.html.twig' as rImg %}

{{ rImg.responsivePicture(
    [
        {
            'image_url': cachable_s3_url(artistEntity, 'photoInPortraitFormat'),
            'options': {
                'sizes': '100vw',
                'transformations_to_widths': {
                    'image_xxs' : '320w',
                    'image_md' : '992w'
                },
                'media_query': '(min-width: 768px)'
            }
        },
        {
            'image_url': cachable_s3_url(artistEntity, 'photoInSquareFormat'),
            'options': {
                'sizes': '100vw',
                'transformations_to_widths': {
                    'image_xxs' : '320w',
                    'image_md' : '992w'
                },
                'media_query': '(min-width: 640px)'
            }
        }
    ],
    {
        'lazyload': true,
        'class': 'js-object-fit',
        'alt': 'Portrait of ' ~ artistEntity.name,
        'data_attributes': {'credits': '© P. H. O\'Tographer'},
    }
) }}

responsiveBackgroundVideo(video, options) with:

• video: an array with the following keys:
  • url (mandatory): the URL of the image
• options: an array with the following keys:
  • transformations (optional): an object with thumbor transformation names as keys and MIME-Types as values. Defaults to

    {
      'video_hevc_720p' : 'video/mp4; codecs=hevc',
      'video_webm_720p' : 'video/webm; codecs=vp9',
      'video_mp4_720p': 'video/mp4'
    }
    

  • class (optional): CSS classes to add to the image. Defaults to empty string.
  • data_attributes (optional): an iterable object with data-attribute names (= the part after data-) and values as key/value pairs. Defaults to empty string.

Example:

{% import '@WebfactoryResponsiveImage/Macros/responsiveVideo.html.twig' as rVid %}

{{ rVid.responsiveBackgroundVideo(
    {
        'url': s3_cachable_url(entity, 'video')
    },
    {
        'class': 'background-video',
        'data_attributes': {'credits': '© P. H. O\'Tographer'},
    }
) }}

This bundle configures the JbPhumborBundle via the Resources/config/jb_phumbor-default-config*.yaml files, setting some default transformations and the Thumbor server settings. You can overwrite any jb_phumbor-setting in your application config.