243 lines
9.0 KiB
PHP
243 lines
9.0 KiB
PHP
<?php
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/*
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* Name: Rotate Image
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* Author: jgen <jgen.tech@gmail.com> / Agasa <hiroshiagasa@gmail.com>
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* Description: Allows admins to rotate 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 rotate 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 ImageRotateException extends SCoreException
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{
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/** @var string */
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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 rotate requests.
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*/
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class RotateImage 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('rotate_enabled', true);
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$config->set_default_int('rotate_default_deg', 180);
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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() && $config->get_bool("rotate_enabled")) {
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/* Add a link to rotate the image */
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$event->add_part($this->theme->get_rotate_html($event->image->id));
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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 Rotate");
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$sb->add_bool_option("rotate_enabled", "Allow rotating images: ");
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$sb->add_label("<br>Default Orientation: ");
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$sb->add_int_option("rotate_default_deg");
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$sb->add_label(" deg");
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$event->panel->add_block($sb);
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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("rotate") && $user->is_admin()) {
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// Try to get the image ID
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$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']) ? $_POST['image_id'] : null;
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}
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if (empty($image_id)) {
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throw new ImageRotateException("Can not rotate 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 #$image_id");
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} else {
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/* Check if options were given to rotate an image. */
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if (isset($_POST['rotate_deg'])) {
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/* get options */
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$deg = 0;
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if (isset($_POST['rotate_deg'])) {
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$deg = int_escape($_POST['rotate_deg']);
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}
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/* Attempt to rotate the image */
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try {
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$this->rotate_image($image_id, $deg);
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//$this->theme->display_rotate_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 (ImageRotateException $e) {
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$this->theme->display_rotate_error($page, "Error Rotating", $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 rotated copy.
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*/
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private function rotate_image(int $image_id, int $deg)
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{
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global $database;
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if (($deg <= -360) || ($deg >= 360)) {
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throw new ImageRotateException("Invalid options for rotation angle. ($deg)");
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}
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$image_obj = Image::by_id($image_id);
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$hash = $image_obj->hash;
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if (is_null($hash)) {
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throw new ImageRotateException("Image does not have a hash associated with it.");
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}
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$image_filename = warehouse_path("images", $hash);
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if (file_exists($image_filename)==false) {
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throw new ImageRotateException("$image_filename does not exist.");
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}
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$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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/*
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Check Memory usage limits
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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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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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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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$memory_use = ($info[0] * $info[1] * ($info['bits'] / 8) * $info['channels'] * 2.5) / 1024;
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$memory_limit = get_memory_limit();
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if ($memory_use > $memory_limit) {
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throw new ImageRotateException("The image is too large to rotate given the memory limits. ($memory_use > $memory_limit)");
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}
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/* Attempt to load the image */
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switch ($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 ImageRotateException("Unsupported image type or ");
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}
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/* Rotate and resample the image */
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/*
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$image_rotated = imagecreatetruecolor( $new_width, $new_height );
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if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
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$transparency = imagecolortransparent($image);
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if ($transparency >= 0) {
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$transparent_color = imagecolorsforindex($image, $trnprt_indx);
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$transparency = imagecolorallocate($image_rotated, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
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imagefill($image_rotated, 0, 0, $transparency);
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imagecolortransparent($image_rotated, $transparency);
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}
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elseif ($info[2] == IMAGETYPE_PNG) {
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imagealphablending($image_rotated, false);
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$color = imagecolorallocatealpha($image_rotated, 0, 0, 0, 127);
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imagefill($image_rotated, 0, 0, $color);
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imagesavealpha($image_rotated, true);
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}
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}
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*/
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$image_rotated = imagerotate($image, $deg, 0);
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/* Temp storage while we rotate */
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$tmp_filename = tempnam(ini_get('upload_tmp_dir'), 'shimmie_rotate');
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if (empty($tmp_filename)) {
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throw new ImageRotateException("Unable to save temporary image file.");
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}
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/* Output to the same format as the original image */
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switch ($info[2]) {
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case IMAGETYPE_GIF: imagegif($image_rotated, $tmp_filename); break;
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case IMAGETYPE_JPEG: imagejpeg($image_rotated, $tmp_filename); break;
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case IMAGETYPE_PNG: imagepng($image_rotated, $tmp_filename); break;
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default:
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throw new ImageRotateException("Unsupported image type.");
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}
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/* Move the new image into the main storage location */
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$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, $target)) {
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throw new ImageRotateException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
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}
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$new_filename = 'rotated-'.$image_obj->filename;
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list($new_width, $new_height) = getimagesize($target);
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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
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filename = :filename, filesize = :filesize, hash = :hash, width = :width, height = :height
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WHERE
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id = :id
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",
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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_id
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]
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);
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log_info("rotate", "Rotated Image #{$image_id} - New hash: {$new_hash}");
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}
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}
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