svg_image.module in Svg Image 8

Contains main functions and hooks for svg_image module.

File

svg_image.module

<?php

/**
 * @file
 * Contains main functions and hooks for svg_image module.
 */
use Drupal\file\Entity\File;
use Drupal\svg_image\Plugin\Field\FieldFormatter\SvgImageFormatter;
use Drupal\svg_image\Plugin\Field\FieldFormatter\SvgImageUrlFormatter;
use Drupal\svg_image\Plugin\Field\FieldWidget\SvgImageWidget;

/**
 * Implements hook_field_widget_info_alter().
 */
function svg_image_field_widget_info_alter(array &$info) {
  $info['image_image']['class'] = SvgImageWidget::class;
}

/**
 * Implements hook_field_formatter_info_alter().
 */
function svg_image_field_formatter_info_alter(array &$info) {
  $info['image']['class'] = SvgImageFormatter::class;
  $info['image_url']['class'] = SvgImageUrlFormatter::class;
}

/**
 * Prepares variables for image style templates.
 *
 * This is a workaround till full/partial images styles support will be added.
 * It allows to still display the original SVG image with a special class,
 * so you can adjust width/height at least.
 *
 * @see template_preprocess_image_style()
 */
function svg_image_preprocess_image_style(array &$variables) {
  if (isset($variables['image']['#access']) && !$variables['image']['#access'] && !empty($variables['image']['#uri'])) {
    $files = \Drupal::entityTypeManager()
      ->getStorage('file')
      ->loadByProperties([
      'uri' => $variables['uri'],
    ]);
    if ($files) {
      $imageFile = reset($files);
      if (svg_image_is_file_svg($imageFile)) {
        $variables['image']['#access'] = TRUE;
        $variables['image']['#attributes']['class'][] = 'no-image-style';
      }
    }
  }
}

/**
 * Provides image file dimensions.
 *
 * @param \Drupal\file\Entity\File $file
 *   SVG file.
 *
 * @return integer[]
 *   Dimensions array.
 */
function svg_image_get_image_file_dimensions(File $file) {
  $image = \Drupal::getContainer()
    ->get('image.factory')
    ->get($file
    ->getFileUri());
  $variables = [];
  if ($image
    ->isValid()) {
    $variables['width'] = $image
      ->getWidth();
    $variables['height'] = $image
      ->getHeight();
  }
  else {

    // Set default width and height values.
    $variables['width'] = $variables['height'] = 64;

    // We can find out only dimensions of the SVG files.
    if (svg_image_is_file_svg($file)) {

      // Parse SVG as XML.
      $fileContents = file_get_contents($file
        ->getFileUri());

      // In some cases file could be not available for the loading. It could be
      // deleted from the files folder physically, moved to other place or
      // permissions will not allow to read it. In this case we will just skip
      // dimensions discovering.
      if ($fileContents) {
        $svg = simplexml_load_string($fileContents);
        $neededVariables = [
          'width',
          'height',
        ];
        if ($svg) {
          foreach ($svg
            ->attributes() as $attribute => $value) {
            if (in_array($attribute, $neededVariables)) {
              $variables[$attribute] = (int) $value;
            }
          }
        }
      }
    }
  }
  return $variables;
}

/**
 * Checks if current file is SVG image.
 *
 * @param \Drupal\file\Entity\File $file
 *   File to check.
 *
 * @return bool
 *   TRUE if is SVG, FALSE otherwise.
 */
function svg_image_is_file_svg(File $file) {
  return $file
    ->getMimeType() === 'image/svg+xml';
}

Functions

Name	Description
svg_image_field_formatter_info_alter	Implements hook_field_formatter_info_alter().
svg_image_field_widget_info_alter	Implements hook_field_widget_info_alter().
svg_image_get_image_file_dimensions	Provides image file dimensions.
svg_image_is_file_svg	Checks if current file is SVG image.
svg_image_preprocess_image_style	Prepares variables for image style templates.