<?php
/*
* Name: Rotate Image
* Author: jgen <jgen.tech@gmail.com> / Agasa <hiroshiagasa@gmail.com>
* Description: Allows admins to rotate images.
* License: GPLv2
* Version: 0.1
* Notice:
* The image resize and resample code is based off of the "smart_resize_image"
* function copyright 2008 Maxim Chernyak, released under a MIT-style license.
* Documentation:
* This extension allows admins to rotate images.
*/
/**
* This class is just a wrapper around SCoreException.
*/
class ImageRotateException extends SCoreException
{
/** @var string */
public $error;
public function __construct(string $error)
{
$this->error = $error;
}
}
/**
* This class handles image rotate requests.
*/
class RotateImage extends Extension
{
public function onInitExt(InitExtEvent $event)
{
global $config;
$config->set_default_bool('rotate_enabled', true);
$config->set_default_int('rotate_default_deg', 180);
}
public function onImageAdminBlockBuilding(ImageAdminBlockBuildingEvent $event)
{
global $user, $config;
if ($user->is_admin() && $config->get_bool("rotate_enabled")) {
/* Add a link to rotate the image */
$event->add_part($this->theme->get_rotate_html($event->image->id));
}
}
public function onSetupBuilding(SetupBuildingEvent $event)
{
$sb = new SetupBlock("Image Rotate");
$sb->add_bool_option("rotate_enabled", "Allow rotating images: ");
$sb->add_label("<br>Default Orientation: ");
$sb->add_int_option("rotate_default_deg");
$sb->add_label(" deg");
$event->panel->add_block($sb);
}
public function onPageRequest(PageRequestEvent $event)
{
global $page, $user;
if ($event->page_matches("rotate") && $user->is_admin()) {
// Try to get the image ID
$image_id = int_escape($event->get_arg(0));
if (empty($image_id)) {
$image_id = isset($_POST['image_id']) ? $_POST['image_id'] : null;
}
if (empty($image_id)) {
throw new ImageRotateException("Can not rotate Image: No valid Image ID given.");
}
$image = Image::by_id($image_id);
if (is_null($image)) {
$this->theme->display_error(404, "Image not found", "No image in the database has the ID #$image_id");
} else {
/* Check if options were given to rotate an image. */
if (isset($_POST['rotate_deg'])) {
/* get options */
$deg = 0;
if (isset($_POST['rotate_deg'])) {
$deg = int_escape($_POST['rotate_deg']);
}
/* Attempt to rotate the image */
try {
$this->rotate_image($image_id, $deg);
//$this->theme->display_rotate_page($page, $image_id);
$page->set_mode("redirect");
$page->set_redirect(make_link("post/view/".$image_id));
} catch (ImageRotateException $e) {
$this->theme->display_rotate_error($page, "Error Rotating", $e->error);
}
}
}
}
}
// Private functions
/* ----------------------------- */
/**
* This function could be made much smaller by using the ImageReplaceEvent
* ie: Pretend that we are replacing the image with a rotated copy.
*/
private function rotate_image(int $image_id, int $deg)
{
global $database;
if (($deg <= -360) || ($deg >= 360)) {
throw new ImageRotateException("Invalid options for rotation angle. ($deg)");
}
$image_obj = Image::by_id($image_id);
$hash = $image_obj->hash;
if (is_null($hash)) {
throw new ImageRotateException("Image does not have a hash associated with it.");
}
$image_filename = warehouse_path("images", $hash);
if (file_exists($image_filename)==false) {
throw new ImageRotateException("$image_filename does not exist.");
}
$info = getimagesize($image_filename);
/* Get the image file type */
$pathinfo = pathinfo($image_obj->filename);
$filetype = strtolower($pathinfo['extension']);
/*
Check Memory usage limits
Old check: $memory_use = (filesize($image_filename)*2) + ($width*$height*4) + (4*1024*1024);
New check: memory_use = width * height * (bits per channel) * channels * 2.5
It didn't make sense to compute the memory usage based on the NEW size for the image. ($width*$height*4)
We need to consider the size that we are GOING TO instead.
The factor of 2.5 is simply a rough guideline.
http://stackoverflow.com/questions/527532/reasonable-php-memory-limit-for-image-resize
*/
$memory_use = ($info[0] * $info[1] * ($info['bits'] / 8) * $info['channels'] * 2.5) / 1024;
$memory_limit = get_memory_limit();
if ($memory_use > $memory_limit) {
throw new ImageRotateException("The image is too large to rotate given the memory limits. ($memory_use > $memory_limit)");
}
/* Attempt to load the image */
switch ($info[2]) {
case IMAGETYPE_GIF: $image = imagecreatefromgif($image_filename); break;
case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($image_filename); break;
case IMAGETYPE_PNG: $image = imagecreatefrompng($image_filename); break;
default:
throw new ImageRotateException("Unsupported image type or ");
}
/* Rotate and resample the image */
/*
$image_rotated = imagecreatetruecolor( $new_width, $new_height );
if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
$transparency = imagecolortransparent($image);
if ($transparency >= 0) {
$transparent_color = imagecolorsforindex($image, $trnprt_indx);
$transparency = imagecolorallocate($image_rotated, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
imagefill($image_rotated, 0, 0, $transparency);
imagecolortransparent($image_rotated, $transparency);
}
elseif ($info[2] == IMAGETYPE_PNG) {
imagealphablending($image_rotated, false);
$color = imagecolorallocatealpha($image_rotated, 0, 0, 0, 127);
imagefill($image_rotated, 0, 0, $color);
imagesavealpha($image_rotated, true);
}
}
*/
$image_rotated = imagerotate($image, $deg, 0);
/* Temp storage while we rotate */
$tmp_filename = tempnam(ini_get('upload_tmp_dir'), 'shimmie_rotate');
if (empty($tmp_filename)) {
throw new ImageRotateException("Unable to save temporary image file.");
}
/* Output to the same format as the original image */
switch ($info[2]) {
case IMAGETYPE_GIF: imagegif($image_rotated, $tmp_filename); break;
case IMAGETYPE_JPEG: imagejpeg($image_rotated, $tmp_filename); break;
case IMAGETYPE_PNG: imagepng($image_rotated, $tmp_filename); break;
default:
throw new ImageRotateException("Unsupported image type.");
}
/* Move the new image into the main storage location */
$new_hash = md5_file($tmp_filename);
$new_size = filesize($tmp_filename);
$target = warehouse_path("images", $new_hash);
if (!@copy($tmp_filename, $target)) {
throw new ImageRotateException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
}
$new_filename = 'rotated-'.$image_obj->filename;
list($new_width, $new_height) = getimagesize($target);
/* Remove temporary file */
@unlink($tmp_filename);
/* Delete original image and thumbnail */
log_debug("image", "Removing image with hash ".$hash);
$image_obj->remove_image_only();
/* Generate new thumbnail */
send_event(new ThumbnailGenerationEvent($new_hash, $filetype));
/* Update the database */
$database->Execute(
"UPDATE images SET
filename = :filename, filesize = :filesize, hash = :hash, width = :width, height = :height
WHERE
id = :id
",
[
"filename"=>$new_filename, "filesize"=>$new_size, "hash"=>$new_hash,
"width"=>$new_width, "height"=>$new_height, "id"=>$image_id
]
);
log_info("rotate", "Rotated Image #{$image_id} - New hash: {$new_hash}");
}
}