liip/imagine-bundle

This bundle provides an image manipulation abstraction toolkit for Symfony-based projects.

Monday, July 23, 2018
by lsmith
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The README.md

LiipImagineBundle

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This bundle provides an image manipulation abstraction toolkit for Symfony-based projects., _(*1)

Overview

Filter Sets: Using any Symfony-supported configuration language (such as YML and XML), you can create filter set definitions that specify transformation routines. These definitions include a set of filters and post-processors, as well as other optional parameters., _(*2)
Filters: Image transformations are applied using filters. A set of build-in filters are provided by the bundle, implementing the most common transformations; examples include thumbnail, scale, crop, flip, strip, and watermark. For more advances transformations, you can easily create your own custom filters., _(*3)
Post-Processors: Modification of the resulting binary image file (created from your filters) are handled by post-processors. Examples include JPEG Optim, Moz JPEG, Opti PNG, and PNG Quant. Just like filters you can easily create your own custom post-processors., _(*4)

Example

Suppose you defined a my_thumb filter set, which can be configured to perform any number of different transformations. The simplest invocation would be to pipe the path of your image to the provided imagine_filter Twig filter., _(*5)

<img src="{{ asset('/relative/path/to/image.jpg') | imagine_filter('my_thumb') }}" />

Contributor Code of Conduct

This project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms., _(*6)

Attribution

Thanks to the many contributors who have dedicated their time and code to this project., _(*7)
The standalone PHP Imagine Library is used by this bundle for image transformations., _(*8)
This package was forked from AvalancheImagineBundle with the goal of making the code more extensible. Reference AvalancheImagineBundle#25 for additional information on the reasoning for this fork., _(*9)

Setup

Installation

Using this package is similar to all Symfony bundles. The following steps must be performed, _(*10)

Detailed setup instructions can be found in the installation chapter of the documentation., _(*11)

Configuration

Detailed information on all available configuration options can be found in the configuration chapter of the documentation., _(*12)

Usage Primer

Generally, this bundle works by applying filter sets to images from inside a template. Your filter sets are defined within the application's configuration file (often app/config/config.yml) and are comprised of a collection of filters, post-processors, and other optional parameters., _(*13)

We'll learn more about post-processors and other available parameters later, but for now lets focus on how to define a simple filter set comprised of a few filters., _(*14)

Create Thumbnails

Before we get started, there is a small amount of configuration needed to ensure our data loaders and cache resolvers operate correctly. Use the following boilerplate in your configuration file., _(*15)

# app/config/config.yml

liip_imagine :

    # configure resolvers
    resolvers :

        # setup the default resolver
        default :

            # use the default web path
            web_path : ~

    # your filter sets are defined here
    filter_sets :

        # use the default cache configuration
        cache : ~

With the basic configuration in place, we'll start with an example that fulfills a common use-case: creating thumbnails. Lets assume we want the resulting thumbnails to have the following transformations applied to them:, _(*16)

Scale and crop the image to 120x90px.
Add a 2px black border to the scaled image.
Adjust the image quality to 75.

Adding onto our boilerplate from above, we need to define a filter set (which we'll name my_thumb) with two filters configured: the thumbnail and background filters., _(*17)

# app/config/config.yml

liip_imagine :
    resolvers :
        default :
            web_path : ~

    filter_sets :
        cache : ~

        # the name of the "filter set"
        my_thumb :

            # adjust the image quality to 75%
            quality : 75

            # list of transformations to apply (the "filters")
            filters :

                # create a thumbnail: set size to 120x90 and use the "outbound" mode
                # to crop the image when the size ratio of the input differs
                thumbnail  : { size : [120, 90], mode : outbound }

                # create a 2px black border: center the thumbnail on a black background
                # 4px larger to create a 2px border around the final image
                background : { size : [124, 94], position : center, color : '#000000' }

You've now created a filter set called my_thumb that performs a thumbnail transformation. The thumbnail filter sizes the image to the desired width and height (in this example, 120x90px), and its mode: outbound option causes the resulting image to be cropped if the input ratio differs. The background filter results in a 2px black border by creating a black canvas 124x94px in size, and positioning the thumbnail at its center., _(*18)

Note: A *filter set can have any number of filters defined for it. Simple transformations may only require a single filter while complex transformations can have an unlimited number of filters defined for them.*, _(*19)

There are a number of additional filters, but for now you can use your newly defined my_thumb filter set immediately within a template., _(*20)

For Twig-based template, use:, _(*21)

<img src="{{ asset('/relative/path/to/image.jpg') | imagine_filter('my_thumb') }}" />

Or, for PHP-based template, use:, _(*22)

<img src="<?php $this['imagine']->filter('/relative/path/to/image.jpg', 'my_thumb') ?>" />

Behind the scenes, the bundle applies the filter(s) to the image on-the-fly when the first page request is served. The transformed image is then cached for subsequent requests. The final cached image path would be similar to /media/cache/my_thumb/relative/path/to/image.jpg., _(*23)

Note: *Using the dev environment you might find that images are not properly rendered via the template helper. This is often caused by having intercept_redirect enabled in your application configuration. To ensure images are rendered, it is strongly suggested to disable this option:, _(*24)

# app/config/config_dev.yml

web_profiler :
    intercept_redirects : false

Runtime Options

Sometime, you may have a filter defined that fulfills 99% of your usage scenarios. Instead of defining a new filter for the erroneous 1% of cases, you may instead choose to alter the behavior of a filter at runtime by passing the template helper an options array., _(*25)

For Twig-based template, use:, _(*26)

{% set runtimeConfig = {"thumbnail": {"size": [50, 50] }} %}

<img src="{{ asset('/relative/path/to/image.jpg') | imagine_filter('my_thumb', runtimeConfig) }}" />

Or, for PHP-based template, use:, _(*27)

 array(
        "size" => array(50, 50)
    )
);
?>

<img src="<?php $this['imagine']->filter('/relative/path/to/image.jpg', 'my_thumb', $runtimeConfig) ?>" />

Path Resolution

Sometime you need to resolve the image path returned by this bundle for a filtered image. This can easily be achieved using Symfony's console binary or programmatically from within a controller or other piece of code., _(*28)

Resolve with the Console

You can resolve an image URL using the console command liip:imagine:cache:resolve. The only required argument is one or more relative image paths (which must be separated by a space)., _(*29)

$ php bin/console liip:imagine:cache:resolve relative/path/to/image1.jpg relative/path/to/image2.jpg

Additionally, you can use the --filter option to specify which filter you want to resolve for (if the --filter option is omitted, all available filters will be resolved)., _(*30)

$ php bin/console liip:imagine:cache:resolve relative/path/to/image1.jpg --filter=my_thumb

Resolve Programmatically

You can resolve the image URL in your code using the getBrowserPath method of the liip_imagine.cache.manager service. Assuming you already have the service assigned to a variable called $imagineCacheManager, you would run:, _(*31)

$imagineCacheManager->getBrowserPath('/relative/path/to/image.jpg', 'my_thumb');

Often, you need to perform this operation in a controller. Assuming your controller inherits from the base Symfony controller, you can take advantage of the inherited get method to request the liip_imagine.cache.manager service, from which you can call getBrowserPath on a relative image path to get its resolved location., _(*32)

/** @var CacheManager */
$imagineCacheManager = $this->get('liip_imagine.cache.manager');

/** @var string */
$resolvedPath = $imagineCacheManager->getBrowserPath('/relative/path/to/image.jpg', 'my_thumb');

Filters

This bundle provides a set of built-in filters and you may easily define your own filters as well. Reference the filters chapter from our documentation., _(*33)

Use as a Service

If you need to use your defined "filter sets" from within your controller, you can fetch this bundle's FilterService from the service container to do the heavy lifting for you., _(*34)

container
            ->get('liip_imagine.service.filter');

        // 1) Simple filter, OR
        $resourcePath = $imagine->getUrlOfFilteredImage('uploads/foo.jpg', 'my_thumb');
        
        // 2) Runtime configuration
        $runtimeConfig = [
            'thumbnail' => [
                'size' => [200, 200]
            ],
        ];
        $resourcePath = $imagine->getUrlOfFilteredImageWithRuntimeFilters(
            'uploads/foo.jpg',
            'my_thumb',
            $runtimeConfig
        );

        // ..
    }
}

?>

Data Roots

By default, Symfony's web/ directory is registered as a data root to load assets from. For many installations this will be sufficient, but sometime you may need to load images from other locations. To do this, you must set the data_root parameter in your configuration (often located at app/config/config.yml)., _(*35)

liip_imagine:
    loaders:
        default:
            filesystem:
                data_root: /path/to/source/images/dir

As of version 1.7.2 you can register multiple data root paths, and the file locator will search each for the requested file., _(*36)

liip_imagine:
    loaders:
        default:
            filesystem:
                data_root:
                    - /path/foo
                    - /path/bar

As of version 1.7.3 you ask for the public resource paths from all registered bundles to be auto-registered as data roots. This allows you to load assets from the Resources/public folders that reside within the loaded bundles. To enable this feature, set the bundle_resources.enabled configuration option to true., _(*37)

liip_imagine:
    loaders:
        default:
            filesystem:
                bundle_resources:
                    enabled: true

If you want to register some of the Resource/public folders, but not all, you can do so by blacklisting the bundles you don't want registered or whitelisting the bundles you do want registered. For example, to blacklist (not register) the bundles "FooBundle" and "BarBundle", you would use the following configuration., _(*38)

liip_imagine:
    loaders:
        default:
            filesystem:
                bundle_resources:
                    enabled: true
                    access_control_type: blacklist
                    access_control_list:
                        - FooBundle
                        - BarBundle

Alternatively, if you want to whitelist (only register) the bundles "FooBundle" and "BarBundle", you would use the following configuration., _(*39)

liip_imagine:
    loaders:
        default:
            filesystem:
                bundle_resources:
                    enabled: true
                    access_control_type: whitelist
                    access_control_list:
                        - FooBundle
                        - BarBundle

Permissions

Image locations must be readable by your web server. On a system that supports setfacl (such as Linux/BSD), use, _(*40)

HTTPDUSER=`ps axo user,comm | grep -E '[a]pache|[h]ttpd|[_]www|[w]ww-data|[n]ginx' | grep -v root | head -1 | cut -d\  -f1`

sudo setfacl -R -m u:"$HTTPDUSER":rwX -m u:`whoami`:rwX /path/to/source/images/dir

sudo setfacl -dR -m u:"$HTTPDUSER":rwX -m u:`whoami`:rwX /path/to/source/images/dir

See the Symfony Permissions documentation for commands compatible with macOS and other environments., _(*41)

Using Apache

You need to grant read access for Apache by adding the following to your Apache VHost configuration, _(*42)

<VirtualHost *:80>
    <!-- Rest of directives like DocumentRoot or ServerName -->

    Alias /FavouriteAlias /path/to/source/images/dir
    <Directory "/path/to/source/images/dir">
        AllowOverride None
        Allow from All
    </Directory>
</VirtualHost>

Alternatively, you can place the directive in a separate file within your project, and include it within your Apache VHost configuration. For example, you can create the file app/config/apache/photos.xml and add the following to your VHost file, _(*43)

<VirtualHost *:80>
    <!-- Rest of directives like DocumentRoot or ServerName -->

    Include "/path/to/your/project/app/config/apache/photos.xml"
</VirtualHost>

This method keeps the file with the rest of your code, allowing you to change it easily or create different environment-dependent configuration files., _(*44)

Once you have configured Apache properly, the relative path to an image with the following absolute path /path/to/source/images/dir/logo.png must be /FavouriteAlias/logo.png., _(*45)

Documentation

For more detailed information about the features of this bundle, refer to the documentation., _(*46)

The Versions

23/07 2018

1.0.x-dev

1.0.9999999.9999999-dev http://liip.ch

This bundle provides an image manipulation abstraction toolkit for Symfony-based projects.

symfony-bundle imagine-bundle

This bundle provides an image manipulation abstraction toolkit for Symfony-based projects.