image.module

<?php


/**
 * @file
 */
use Drupal\image\Entity\ImageStyle;

/**
 * The name of the query parameter for image derivative tokens.
 */
define('IMAGE_DERIVATIVE_TOKEN', 'itok');

/**
 * Clears cached versions of a specific file in all styles.
 *
 * @param $path
 *   The Drupal file path to the original image.
 */
function image_path_flush($path) {
    $styles = ImageStyle::loadMultiple();
    foreach ($styles as $style) {
        $style->flush($path);
    }
}

/**
 * Gets an array of image styles suitable for using as select list options.
 *
 * @param $include_empty
 *   If TRUE a '- None -' option will be inserted in the options array.
 *
 * @return string[]
 *   Array of image styles both key and value are set to style name.
 */
function image_style_options($include_empty = TRUE) {
    $styles = ImageStyle::loadMultiple();
    $options = [];
    if ($include_empty && !empty($styles)) {
        $options[''] = t('- None -');
    }
    foreach ($styles as $name => $style) {
        $options[$name] = $style->label();
    }
    if (empty($options)) {
        $options[''] = t('No defined styles');
    }
    return $options;
}

/**
 * Prepares variables for image style templates.
 *
 * Default template: image-style.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - width: The width of the image.
 *   - height: The height of the image.
 *   - style_name: The name of the image style to be applied.
 *   - uri: URI of the source image before styling.
 *   - alt: The alternative text for text-based browsers. HTML 4 and XHTML 1.0
 *     always require an alt attribute. The HTML 5 draft allows the alt
 *     attribute to be omitted in some cases. Therefore, this variable defaults
 *     to an empty string, but can be set to NULL for the attribute to be
 *     omitted. Usually, neither omission nor an empty string satisfies
 *     accessibility requirements, so it is strongly encouraged for code using
 *     '#theme' => 'image_style' to pass a meaningful value for this variable.
 *     - https://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
 *     - https://www.w3.org/TR/xhtml1/dtds.html
 *     - http://dev.w3.org/html5/spec/Overview.html#alt
 *   - title: The title text is displayed when the image is hovered in some
 *     popular browsers.
 *   - attributes: Associative array of additional attributes to be placed in
 *     the img tag.
 */
function template_preprocess_image_style(&$variables) : void {
    $style = ImageStyle::load($variables['style_name']);
    // Determine the dimensions of the styled image.
    $dimensions = [
        'width' => $variables['width'],
        'height' => $variables['height'],
    ];
    $style->transformDimensions($dimensions, $variables['uri']);
    $variables['image'] = [
        '#theme' => 'image',
        '#width' => $dimensions['width'],
        '#height' => $dimensions['height'],
        '#attributes' => $variables['attributes'],
        '#style_name' => $variables['style_name'],
    ];
    // If the current image toolkit supports this file type, prepare the URI for
    // the derivative image. If not, just use the original image resized to the
    // dimensions specified by the style.
    if ($style->supportsUri($variables['uri'])) {
        $variables['image']['#uri'] = $style->buildUrl($variables['uri']);
    }
    else {
        $variables['image']['#uri'] = $variables['uri'];
        // Don't render the image by default, but allow other preprocess functions
        // to override that if they need to.
        $variables['image']['#access'] = FALSE;
        // Inform the site builders why their image didn't work.
        \Drupal::logger('image')->warning('Could not apply @style image style to @uri because the style does not support it.', [
            '@style' => $style->label(),
            '@uri' => $variables['uri'],
        ]);
    }
    if (\array_key_exists('alt', $variables)) {
        $variables['image']['#alt'] = $variables['alt'];
    }
    if (\array_key_exists('title', $variables)) {
        $variables['image']['#title'] = $variables['title'];
    }
}

/**
 * Returns the offset in pixels from the anchor.
 *
 * @param string $anchor
 *   The anchor ('top', 'left', 'bottom', 'right', 'center').
 * @param int $current_size
 *   The current size, in pixels.
 * @param int $new_size
 *   The new size, in pixels.
 *
 * @return int|string
 *   The offset from the anchor, in pixels, or the anchor itself, if its value
 *   isn't one of the accepted values.
 *
 * @deprecated in drupal:11.1.0 and is removed from drupal:12.0.0. Use
 *   \Drupal\Component\Utility\Image::getKeywordOffset() instead.
 *
 * @see https://www.drupal.org/node/3268441
 */
function image_filter_keyword($anchor, $current_size, $new_size) {
    @trigger_error('image_filter_keyword() is deprecated in drupal:11.1.0 and is removed from drupal:12.0.0. Use \\Drupal\\Component\\Utility\\Image::getKeywordOffset() instead. See https://www.drupal.org/node/3268441', E_USER_DEPRECATED);
    switch ($anchor) {
        case 'top':
        case 'left':
            return 0;
        case 'bottom':
        case 'right':
            return $current_size - $new_size;
        case 'center':
            return $current_size / 2 - $new_size / 2;
        default:
            return $anchor;
    }
}