263 lines
9.9 KiB
PHP
263 lines
9.9 KiB
PHP
<?php declare(strict_types=1);
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abstract class ResizeConfig
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{
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const ENABLED = 'resize_enabled';
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const UPLOAD = 'resize_upload';
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const ENGINE = 'resize_engine';
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const DEFAULT_WIDTH = 'resize_default_width';
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const DEFAULT_HEIGHT = 'resize_default_height';
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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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/** @var ResizeImageTheme */
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protected $theme;
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/**
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* Needs to be after the data processing extensions
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*/
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public function get_priority(): int
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{
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return 55;
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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(ResizeConfig::ENABLED, true);
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$config->set_default_bool(ResizeConfig::UPLOAD, false);
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$config->set_default_string(ResizeConfig::ENGINE, MediaEngine::GD);
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$config->set_default_int(ResizeConfig::DEFAULT_WIDTH, 0);
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$config->set_default_int(ResizeConfig::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->can(Permissions::EDIT_FILES) && $config->get_bool(ResizeConfig::ENABLED)
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&& $this->can_resize_format($event->image->ext, $event->image->lossless)) {
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/* Add a link to resize the image */
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$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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$sb->start_table();
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$sb->add_choice_option(ResizeConfig::ENGINE, Media::IMAGE_MEDIA_ENGINES, "Engine: ", true);
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$sb->add_bool_option(ResizeConfig::ENABLED, "Allow resizing images: ", true);
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$sb->add_bool_option(ResizeConfig::UPLOAD, "Resize on upload: ", true);
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$sb->end_table();
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$sb->start_table();
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$sb->add_table_header("Preset/Default Dimensions");
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$sb->add_label("<tr><th>Width</th><td>");
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$sb->add_int_option(ResizeConfig::DEFAULT_WIDTH);
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$sb->add_label("</td><td>px</td></tr>");
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$sb->add_label("<tr><th>Height</th><td>");
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$sb->add_int_option(ResizeConfig::DEFAULT_HEIGHT);
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$sb->add_label("</td><td>px</td></tr>");
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$sb->add_label("<tr><td></td><td>(enter 0 for no default)</td></tr>");
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$sb->end_table();
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$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(ResizeConfig::UPLOAD) == true
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&& $this->can_resize_format($event->type, $image_obj->lossless)) {
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$width = $height = 0;
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if ($config->get_int(ResizeConfig::DEFAULT_WIDTH) !== 0) {
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$height = $config->get_int(ResizeConfig::DEFAULT_WIDTH);
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}
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if ($config->get_int(ResizeConfig::DEFAULT_HEIGHT) !== 0) {
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$height = $config->get_int(ResizeConfig::DEFAULT_HEIGHT);
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}
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$isanigif = 0;
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if ($image_obj->ext == "gif") {
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$image_filename = warehouse_path(Image::IMAGE_DIR, $image_obj->hash);
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if (($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") && $user->can(Permissions::EDIT_FILES)) {
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// Try to get the image ID
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$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(PageMode::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", $e->error);
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}
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}
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}
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}
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}
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private function can_resize_format($format, ?bool $lossless = null): bool
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{
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global $config;
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$engine = $config->get_string(ResizeConfig::ENGINE);
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return Media::is_input_supported($engine, $format, $lossless)
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&& Media::is_output_supported($engine, $format, $lossless);
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}
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// Private functions
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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 $config;
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if (($height <= 0) && ($width <= 0)) {
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throw new ImageResizeException("Invalid options for height and width. ($width x $height)");
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}
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$engine = $config->get_string(ResizeConfig::ENGINE);
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if (!$this->can_resize_format($image_obj->ext, $image_obj->lossless)) {
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throw new ImageResizeException("Engine $engine cannot resize selected image");
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}
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$hash = $image_obj->hash;
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$image_filename = warehouse_path(Image::IMAGE_DIR, $hash);
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$info = getimagesize($image_filename);
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if (($image_obj->width != $info[0]) || ($image_obj->height != $info[1])) {
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throw new ImageResizeException("The current image size does not match what is set in the database! - Aborting Resize.");
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}
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list($new_height, $new_width) = $this->calc_new_size($image_obj, $width, $height);
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/* Temp storage while we resize */
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$tmp_filename = tempnam("/tmp", 'shimmie_resize');
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if (empty($tmp_filename)) {
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throw new ImageResizeException("Unable to save temporary image file.");
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}
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send_event(new MediaResizeEvent(
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$engine,
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$image_filename,
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$image_obj->ext,
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$tmp_filename,
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$new_width,
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$new_height,
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true
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));
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$new_image = new Image();
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$new_image->hash = md5_file($tmp_filename);
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$new_image->filesize = filesize($tmp_filename);
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$new_image->filename = 'resized-'.$image_obj->filename;
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$new_image->width = $new_width;
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$new_image->height = $new_height;
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$new_image->ext = $image_obj->ext;
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/* Move the new image into the main storage location */
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$target = warehouse_path(Image::IMAGE_DIR, $new_image->hash);
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if (!@copy($tmp_filename, $target)) {
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throw new ImageResizeException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
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}
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/* Remove temporary file */
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@unlink($tmp_filename);
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send_event(new ImageReplaceEvent($image_obj->id, $new_image));
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log_info("resize", "Resized Image #{$image_obj->id} - New hash: {$new_image->hash}");
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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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