333 lines
14 KiB
PHP
333 lines
14 KiB
PHP
<?php
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/*
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* Name: Resize Image
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* Author: jgen <jgen.tech@gmail.com>
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* Description: Allows admins to resize images.
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* License: GPLv2
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* Version: 0.1
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* Notice:
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* The image resize and resample code is based off of the "smart_resize_image"
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* function copyright 2008 Maxim Chernyak, released under a MIT-style license.
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* Documentation:
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* This extension allows admins to resize images.
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*/
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/**
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* This class is just a wrapper around SCoreException.
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*/
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class ImageResizeException extends SCoreException
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{
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public $error;
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public function __construct(string $error)
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{
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$this->error = $error;
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}
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}
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/**
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* This class handles image resize requests.
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*/
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class ResizeImage extends Extension
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{
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public function onInitExt(InitExtEvent $event)
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{
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global $config;
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$config->set_default_bool('resize_enabled', true);
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$config->set_default_bool('resize_upload', false);
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$config->set_default_int('resize_default_width', 0);
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$config->set_default_int('resize_default_height', 0);
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}
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public function onImageAdminBlockBuilding(ImageAdminBlockBuildingEvent $event)
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{
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global $user, $config;
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if ($user->is_admin() && $config->get_bool("resize_enabled")) {
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/* Add a link to resize the image */
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$event->add_part($this->theme->get_resize_html($event->image));
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}
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}
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public function onSetupBuilding(SetupBuildingEvent $event)
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{
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$sb = new SetupBlock("Image Resize");
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$sb->add_bool_option("resize_enabled", "Allow resizing images: ");
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$sb->add_bool_option("resize_upload", "<br>Resize on upload: ");
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$sb->add_label("<br>Preset/Default Width: ");
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$sb->add_int_option("resize_default_width");
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$sb->add_label(" px");
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$sb->add_label("<br>Preset/Default Height: ");
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$sb->add_int_option("resize_default_height");
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$sb->add_label(" px");
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$sb->add_label("<br>(enter 0 for no default)");
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$event->panel->add_block($sb);
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}
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public function onDataUpload(DataUploadEvent $event)
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{
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global $config, $page;
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$image_obj = Image::by_id($event->image_id);
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if ($config->get_bool("resize_upload") == true && ($image_obj->ext == "jpg" || $image_obj->ext == "png" || $image_obj->ext == "gif")) {
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$width = $height = 0;
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if ($config->get_int("resize_default_width") !== 0) {
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$height = $config->get_int("resize_default_width");
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}
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if ($config->get_int("resize_default_height") !== 0) {
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$height = $config->get_int("resize_default_height");
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}
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$isanigif = 0;
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if ($image_obj->ext == "gif") {
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$image_filename = warehouse_path("images", $image_obj->hash);
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if (($fh = @fopen($image_filename, 'rb'))) {
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//check if gif is animated (via http://www.php.net/manual/en/function.imagecreatefromgif.php#104473)
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while (!feof($fh) && $isanigif < 2) {
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$chunk = fread($fh, 1024 * 100);
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$isanigif += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
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}
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}
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}
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if ($isanigif == 0) {
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try {
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$this->resize_image($image_obj, $width, $height);
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} catch (ImageResizeException $e) {
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$this->theme->display_resize_error($page, "Error Resizing", $e->error);
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}
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//Need to generate thumbnail again...
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//This only seems to be an issue if one of the sizes was set to 0.
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$image_obj = Image::by_id($event->image_id); //Must be a better way to grab the new hash than setting this again..
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send_event(new ThumbnailGenerationEvent($image_obj->hash, $image_obj->ext, true));
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log_info("resize", "Image #{$event->image_id} has been resized to: ".$width."x".$height);
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//TODO: Notify user that image has been resized.
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}
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}
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}
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public function onPageRequest(PageRequestEvent $event)
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{
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global $page, $user;
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if ($event->page_matches("resize") && $user->is_admin()) {
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// Try to get the image ID
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$image_id = int_escape($event->get_arg(0));
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if (empty($image_id)) {
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$image_id = isset($_POST['image_id']) ? int_escape($_POST['image_id']) : null;
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}
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if (empty($image_id)) {
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throw new ImageResizeException("Can not resize Image: No valid Image ID given.");
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}
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$image = Image::by_id($image_id);
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if (is_null($image)) {
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$this->theme->display_error(404, "Image not found", "No image in the database has the ID #$image_id");
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} else {
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/* Check if options were given to resize an image. */
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if (isset($_POST['resize_width']) || isset($_POST['resize_height'])) {
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/* get options */
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$width = $height = 0;
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if (isset($_POST['resize_width'])) {
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$width = int_escape($_POST['resize_width']);
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}
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if (isset($_POST['resize_height'])) {
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$height = int_escape($_POST['resize_height']);
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}
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/* Attempt to resize the image */
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try {
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$this->resize_image($image, $width, $height);
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//$this->theme->display_resize_page($page, $image_id);
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$page->set_mode("redirect");
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$page->set_redirect(make_link("post/view/".$image_id));
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} catch (ImageResizeException $e) {
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$this->theme->display_resize_error($page, "Error Resizing", $e->error);
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}
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}
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}
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}
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}
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// Private functions
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/* ----------------------------- */
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/**
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* This function could be made much smaller by using the ImageReplaceEvent
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* ie: Pretend that we are replacing the image with a resized copy.
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*/
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private function resize_image(Image $image_obj, int $width, int $height)
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{
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global $database;
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if (($height <= 0) && ($width <= 0)) {
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throw new ImageResizeException("Invalid options for height and width. ($width x $height)");
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}
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$hash = $image_obj->hash;
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$image_filename = warehouse_path("images", $hash);
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$info = getimagesize($image_filename);
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/* Get the image file type */
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$pathinfo = pathinfo($image_obj->filename);
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$filetype = strtolower($pathinfo['extension']);
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if (($image_obj->width != $info[0]) || ($image_obj->height != $info[1])) {
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throw new ImageResizeException("The current image size does not match what is set in the database! - Aborting Resize.");
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}
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$memory_use = $this->calc_memory_use($info);
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$memory_limit = get_memory_limit();
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if ($memory_use > $memory_limit) {
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throw new ImageResizeException("The image is too large to resize given the memory limits. ($memory_use > $memory_limit)");
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}
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list($new_height, $new_width) = $this->calc_new_size($image_obj, $width, $height);
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/* Attempt to load the image */
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switch ($info[2]) {
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case IMAGETYPE_GIF: $image = imagecreatefromgif($image_filename); break;
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case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($image_filename); break;
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case IMAGETYPE_PNG: $image = imagecreatefrompng($image_filename); break;
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default:
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throw new ImageResizeException("Unsupported image type (Only GIF, JPEG, and PNG are supported).");
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}
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// Handle transparent images
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$image_resized = imagecreatetruecolor($new_width, $new_height);
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if ($info[2] == IMAGETYPE_GIF) {
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$transparency = imagecolortransparent($image);
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// If we have a specific transparent color
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if ($transparency >= 0) {
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// Get the original image's transparent color's RGB values
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$transparent_color = imagecolorsforindex($image, $transparency);
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// Allocate the same color in the new image resource
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$transparency = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
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// Completely fill the background of the new image with allocated color.
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imagefill($image_resized, 0, 0, $transparency);
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// Set the background color for new image to transparent
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imagecolortransparent($image_resized, $transparency);
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}
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} elseif ($info[2] == IMAGETYPE_PNG) {
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//
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// More info here: http://stackoverflow.com/questions/279236/how-do-i-resize-pngs-with-transparency-in-php
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//
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imagealphablending($image_resized, false);
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imagesavealpha($image_resized, true);
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$transparent_color = imagecolorallocatealpha($image_resized, 255, 255, 255, 127);
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imagefilledrectangle($image_resized, 0, 0, $new_width, $new_height, $transparent_color);
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}
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// Actually resize the image.
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imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $new_width, $new_height, $image_obj->width, $image_obj->height);
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/* Temp storage while we resize */
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$tmp_filename = tempnam("/tmp", 'shimmie_resize');
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if (empty($tmp_filename)) {
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throw new ImageResizeException("Unable to save temporary image file.");
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}
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/* Output to the same format as the original image */
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switch ($info[2]) {
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case IMAGETYPE_GIF: imagegif($image_resized, $tmp_filename); break;
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case IMAGETYPE_JPEG: imagejpeg($image_resized, $tmp_filename); break;
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case IMAGETYPE_PNG: imagepng($image_resized, $tmp_filename); break;
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default:
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throw new ImageResizeException("Failed to save the new image - Unsupported image type.");
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}
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/* Move the new image into the main storage location */
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$new_hash = md5_file($tmp_filename);
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$new_size = filesize($tmp_filename);
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$target = warehouse_path("images", $new_hash);
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if (!@copy($tmp_filename, $target)) {
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throw new ImageResizeException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
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}
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$new_filename = 'resized-'.$image_obj->filename;
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/* Remove temporary file */
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@unlink($tmp_filename);
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/* Delete original image and thumbnail */
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log_debug("image", "Removing image with hash ".$hash);
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$image_obj->remove_image_only();
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/* Generate new thumbnail */
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send_event(new ThumbnailGenerationEvent($new_hash, $filetype));
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/* Update the database */
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$database->Execute("
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UPDATE images SET filename = :filename, filesize = :filesize, hash = :hash, width = :width, height = :height
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WHERE id = :id
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", [
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"filename"=>$new_filename, "filesize"=>$new_size, "hash"=>$new_hash,
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"width"=>$new_width, "height"=>$new_height, "id"=>$image_obj->id
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]);
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log_info("resize", "Resized Image #{$image_obj->id} - New hash: {$new_hash}");
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}
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/**
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* Check Memory usage limits
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*
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* Old check: $memory_use = (filesize($image_filename)*2) + ($width*$height*4) + (4*1024*1024);
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* New check: $memory_use = $width * $height * ($bits_per_channel) * channels * 2.5
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*
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* It didn't make sense to compute the memory usage based on the NEW size for the image. ($width*$height*4)
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* We need to consider the size that we are GOING TO instead.
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*
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* The factor of 2.5 is simply a rough guideline.
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* http://stackoverflow.com/questions/527532/reasonable-php-memory-limit-for-image-resize
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*/
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private function calc_memory_use(array $info): int
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{
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if (isset($info['bits']) && isset($info['channels'])) {
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$memory_use = ($info[0] * $info[1] * ($info['bits'] / 8) * $info['channels'] * 2.5) / 1024;
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} else {
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// If we don't have bits and channel info from the image then assume default values
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// of 8 bits per color and 4 channels (R,G,B,A) -- ie: regular 24-bit color
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$memory_use = ($info[0] * $info[1] * 1 * 4 * 2.5) / 1024;
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}
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return (int)$memory_use;
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}
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/**
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* #return int[]
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*/
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private function calc_new_size(Image $image_obj, int $width, int $height): array
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{
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/* Calculate the new size of the image */
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if ($height > 0 && $width > 0) {
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$new_height = $height;
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$new_width = $width;
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return [$new_height, $new_width];
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} else {
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// Scale the new image
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if ($width == 0) {
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$factor = $height / $image_obj->height;
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} elseif ($height == 0) {
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$factor = $width / $image_obj->width;
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} else {
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$factor = min($width / $image_obj->width, $height / $image_obj->height);
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}
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$new_width = round($image_obj->width * $factor);
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$new_height = round($image_obj->height * $factor);
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return [$new_height, $new_width];
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}
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}
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}
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