first import
This commit is contained in:
Bachir Soussi Chiadmi
237
sites/all/modules/adaptive_image/adaptive_image.module
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237
sites/all/modules/adaptive_image/adaptive_image.module
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<?php
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/**
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* @file
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* Adaptive Image - Adaptive images for Drupal
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* @see http://adaptive-images.com/
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*
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* @author
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* Stefan Auditor <stefan.auditor@erdfisch.de>
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*/
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/**
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* Implements hook_init().
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*/
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function adaptive_image_init() {
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// According to the documentation of hook_init() it should not be used to
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// load JS or CSS. The CSS case has been moved to the info file. But the JS is
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// here by intention, as we want it inline to prevent wait time while loading
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// the script
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// No need for drupal behaviours, jquery compatibility wrapper nor ready event
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$js = "document.cookie = 'adaptive_image=' + Math.max(screen.width, screen.height) + '; path=/';";
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drupal_add_js($js,
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// First-come, first-served
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array(
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'type' => 'inline',
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'scope' => 'header',
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'group' => JS_LIBRARY,
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'every_page' => TRUE,
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'weight' => -500,
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)
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);
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}
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/**
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* Implements hook_menu().
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*/
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function adaptive_image_menu() {
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$items = array();
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// Add image style generation paths adaptive URLs.
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if (module_exists('image')) {
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// Generate and deliver image derivatives of public files.
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$directory_path = file_stream_wrapper_get_instance_by_scheme('public')->getDirectoryPath();
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$items[$directory_path . '/styles/%image_style/adaptive-image'] = array(
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'title' => 'Generate image style',
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'page callback' => 'adaptive_image_style_deliver',
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'page arguments' => array(count(explode('/', $directory_path)) + 1),
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'access callback' => TRUE,
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'type' => MENU_CALLBACK,
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'file' => 'adaptive_image.image.inc',
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);
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// Generate and deliver image derivatives of private files.
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$items['system/files/styles/%image_style/adaptive-image'] = array(
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'title' => 'Generate adaptive image style',
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'page callback' => 'adaptive_image_style_deliver',
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'page arguments' => array(3),
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'access callback' => TRUE,
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'type' => MENU_CALLBACK,
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'file' => 'adaptive_image.image.inc',
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);
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}
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return $items;
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}
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/**
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* Implements hook_image_effect_info().
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*/
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function adaptive_image_image_effect_info() {
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$effects = array();
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$effects['adaptive_image'] = array(
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'label' => t('Adaptive'),
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'help' => t('Adaptive image scale according to client resolution.'),
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'effect callback' => 'image_scale_effect',
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'dimensions callback' => 'image_scale_dimensions',
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'form callback' => 'adaptive_image_scale_form',
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'summary theme' => 'adaptive_image_scale_summary',
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);
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return $effects;
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}
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/**
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* Form structure for the image scale form.
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*
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* Note that this is not a complete form, it only contains the portion of the
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* form for configuring the scale options. Therefore it does not not need to
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* include metadata about the effect, nor a submit button.
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*
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* @param $data
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* The current configuration for this scale effect.
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*/
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function adaptive_image_scale_form($data) {
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$form['resolutions'] = array(
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'#type' => 'textfield',
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'#title' => t('Resolutions'),
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'#default_value' => isset($data['resolutions']) ? $data['resolutions'] : '1382, 992, 768, 480',
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'#required' => TRUE,
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'#description' => t('The resolution break-points to use (screen widths, in pixels).'),
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);
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$form['mobile_first'] = array(
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'#type' => 'checkbox',
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'#title' => t('Mobile first'),
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'#default_value' => isset($data['mobile_first']) ? $data['mobile_first'] : TRUE,
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'#description' => t("Check this to send the smallest version when the resolution can not be determined."),
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);
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$resolutions = explode(',', str_replace(' ', '', $form['resolutions']['#default_value']));
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$resolution = adaptive_image_resolution($resolutions);
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// Provide needed defaults
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$form['height'] = array('#type' => 'hidden','#default_value' => NULL);
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$form['width'] = array('#type' => 'hidden','#default_value' => $resolution);
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$form['upscale'] = array('#type' => 'hidden','#default_value' => NULL);
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return $form;
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}
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/**
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* Implements hook_theme().
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*/
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function adaptive_image_theme() {
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return array(
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'adaptive_image_scale_summary' => array(
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'variables' => array('data' => NULL),
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),
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);
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}
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/**
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* Returns HTML for a summary of an image scale effect.
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*
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* @param $variables
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* An associative array containing:
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* - data: The current configuration for this scale effect.
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*
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* @ingroup themeable
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*/
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function theme_adaptive_image_scale_summary($variables) {
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$data = $variables['data'];
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if ($data['resolutions']) {
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return check_plain($data['resolutions']);
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}
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}
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/**
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* Implements template_preprocess_image().
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*
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* Adds a class to adaptive images for max-width.
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*/
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function adaptive_image_preprocess_image(&$variables) {
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global $base_url;
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if (isset($variables['style_name'])) {
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// Get image style settings
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$style = image_style_load($variables['style_name']);
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// Check if style contains the adaptive image effect
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if ($style && adaptive_image_contains_effect($style)) {
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$settings = adaptive_image_effect_settings($style);
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$resolutions = explode(',', $settings['resolutions']);
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$resolution = adaptive_image_resolution($resolutions);
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// Only construct direct path if not private
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if (!strpos($variables['path'], '/system/') && is_numeric($resolution)) {
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$path_parts = pathinfo($variables['path']);
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$derivative_uri = $path_parts['dirname'] . '/' . $resolution . '/' . $path_parts['basename'];
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}
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if (isset($derivative_uri) && file_exists(str_replace($base_url, '.', $derivative_uri))) {
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// Deliver existing path to bypass menu callback
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$variables['path'] = $derivative_uri;
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}
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else {
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// Reconstruct the image path to %/%style_name/adaptive-image/% to
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// trigger image generation or file access check
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$variables['path'] = str_replace('styles/' . $variables['style_name'], 'styles/' . $variables['style_name'] . '/adaptive-image', $variables['path']);
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}
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// Add class for styling
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$variables['attributes']['class'] = 'adaptive-image';
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// Remove fixed image dimensions
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unset($variables['height']);
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unset($variables['width']);
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}
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}
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}
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/**
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* Check for adaptive image effect from style
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*/
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function adaptive_image_contains_effect($style) {
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foreach ($style['effects'] as $effect) {
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if ($effect['name'] == 'adaptive_image') {
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Get adaptive image effect from style settings
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*/
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function adaptive_image_effect_settings($style) {
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$settings = array();
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foreach ($style['effects'] as $effect) {
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if ($effect['name'] == 'adaptive_image') {
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$settings = $effect['data'];
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}
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}
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return $settings;
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}
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/**
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* Determine current resolution
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*/
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function adaptive_image_resolution($resolutions) {
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$resolution = '';
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/* Check to see if a valid cookie exists */
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if (count($resolutions) && isset($_COOKIE['adaptive_image'])) {
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if (is_numeric($_COOKIE['adaptive_image'])) {
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$client_width = (int) $_COOKIE['adaptive_image']; // store the cookie value in a variable
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/* the client width in the cookie is valid, now fit that number into the correct resolution break point */
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rsort($resolutions); // make sure the supplied break-points are in reverse size order
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$resolution = $resolutions[0]; // by default it's the largest supported break-point
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foreach ($resolutions as $break_point) { // filter down
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if ($client_width <= $break_point) {
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$resolution = $break_point;
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}
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}
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} else {
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setcookie("adaptive_image", "", time() -1); // delete the mangled cookie
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}
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}
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return $resolution;
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}
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