Working on Image Resize feature.
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green-ponies (jgen)
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233
ext/resize/main.php
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233
ext/resize/main.php
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<?php
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/*
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* Name: Image Resize
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* Author: jgen <jgen.tech@gmail.com>
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* Description: Allows admins to resize uploaded 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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*
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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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var $error;
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public function __construct($error) {
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$this->error = $error;
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}
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}
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/**
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* This class handles image resize requests.
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*/
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class ResizeImage extends SimpleExtension {
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public function onInitExt($event) {
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global $config;
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$config->set_default_bool('resize_enabled', true);
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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($event) {
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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->id));
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}
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}
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public function onSetupBuilding($event) {
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$sb = new SetupBlock("Image Resize");
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$sb->add_bool_option("resize_enabled", "Allow resizing images: ");
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$sb->add_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 onPageRequest($event) {
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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']) ? $_POST['image_id'] : null;
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}
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if (empty($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($page, "Image not found", "No image in the database has the ID #$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($_POST['resize'])) {
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/* get options */
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$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($_POST['resize_height'])) {
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$width = 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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} catch (ImageResizeException $e) {
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$this->theme->display_resize_error($page, "Error Resizing", $e->error);
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}
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} else {
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/* Display options for resizing */
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$this->theme->display_resize_page($page, $image_id);
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}
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}
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}
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}
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// Private functions
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/*
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This function could be made much smaller by using the ImageReplaceEvent
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ie: Pretend that we are replacing the image with a resized copy.
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*/
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private function resize_image($image, $width, $height) {
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global $config;
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global $user;
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global $page;
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global $database;
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if ( $height <= 0 && $width <= 0 ) {
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throw new ImageResizeException("Invalid options for height and width.");
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}
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$id = $image->id;
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$hash = $image->hash;
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if (is_null($hash)) {
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throw new ImageResizeException("Image does not have a hash associated with it.");
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}
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$image_filename = warehouse_path("images", $hash);
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$info = getimagesize($image_filename);
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if (($image->width != $info[0] ) || ($image->height != $info[1])) {
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throw new ImageResizeException("The image size does not match what is in the database! - Aborting Resize.");
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}
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/* Check memory usage limits */
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$memory_use = (filesize($image_filename)*2) + ($width*$height*4) + (4*1024*1024);
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$memory_limit = get_memory_limit();
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if ($memory_use > $memory_limit) {
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throw new ImageResizeException("The image is too large to resize given the memory limits. ($memory_use > $memory_limit)");
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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 = $width;
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} else {
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// Scale the new image
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if ($width == 0) $factor = $height/$image->height;
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elseif ($height == 0) $factor = $width/$image->width;
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else $factor = min( $width / $image->width, $height / $image->height );
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$new_width = round( $image->width * $factor );
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$new_height = round( $image->height * $factor );
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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 ImageResizeException("Unsupported image type.");
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}
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/* Resize and resample the image */
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$image_resized = 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_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
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imagefill($image_resized, 0, 0, $transparency);
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imagecolortransparent($image_resized, $transparency);
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}
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elseif ($info[2] == IMAGETYPE_PNG) {
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imagealphablending($image_resized, false);
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$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
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imagefill($image_resized, 0, 0, $color);
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imagesavealpha($image_resized, true);
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}
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}
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imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $new_width, $new_height, $image->width, $image->height);
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/* Delete original image and thumbnail */
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log_debug("image", "Removing image with hash ".$hash);
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$image->remove_image_only();
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/* Temp storage while we resize */
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$tmp_filename = tempnam("/tmp", 'shimmie_resize_'.time());
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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, $tmp_filename); break;
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default:
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throw new ImageResizeException("Unsupported image type.");
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}
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/* Regenerate thumbnail */
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unlink($tmp_filename);
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/* Update the database */
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$database->Execute(
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"UPDATE images SET
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filename = :filename, filesize = :filesize, hash = :hash,
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ext = :ext, width = :width, height = :height, source = :source
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WHERE
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id = :id
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",
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array(
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"filename"=>$image_new->filename, "filesize"=>$image->filesize, "hash"=>$image->hash,
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"ext"=>$image->ext, "width"=>$image->width, "height"=>$image->height, "source"=>$image->source,
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"id"=>$id
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)
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);
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log_info("resize", "Resized Image #{$image->id}");
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}
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}
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?>
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56
ext/resize/theme.php
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56
ext/resize/theme.php
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<?php
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class ResizeImageTheme extends Themelet {
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/*
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* Display a link to resize an image
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*/
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public function get_resize_html($image_id) {
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global $user;
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global $config;
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$i_image_id = int_escape($image_id);
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$html = "
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".make_form(make_link("resize"),'POST',false,'resize_image')."
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<input type='hidden' name='image_id' value='$i_image_id' />
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<input type='submit' value='Resize' id='resize_image_submit' />
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</form>
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";
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return $html;
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}
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public function display_resize_error(Page $page, $title, $message) {
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$page->add_block(new Block($title, $message));
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}
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public function display_resize_page(Page $page, $image_id) {
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global $config;
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$default_width = $config->get_int('resize_default_width');
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$default_height = $config->get_int('resize_default_height');
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$image = Image::by_id($image_id);
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$thumbnail = $this->build_thumb_html($image, null);
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$html = "<p>Resize Image ID ".$image_id."<br>".$thumbnail."</p>
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<p>Please note: You will have to refresh the image page, or empty your browser cache.</p>
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<p>Enter the new size for the image, or leave blank to scale the image automatically.</p><br>"
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.make_form(make_link('resize/'.$image_id), 'POST', $multipart=True,'form_resize')."
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<input type='hidden' name='image_id' value='$image_id'>
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<table id='large_upload_form'>
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<tr><td>New Width</td><td colspan='3'><input id='resize_width' name='resize_width' type='text' value='".$default_width."'></td></tr>
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<tr><td>New Height</td><td colspan='3'><input id='resize_height' name='resize_height' type='text' value='".$default_height."'></td></tr>
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<tr><td colspan='4'><input id='resizebutton' type='submit' value='Resize'></td></tr>
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</table>
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</form>
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";
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$page->set_title("Resize Image");
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$page->set_heading("Resize Image");
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$page->add_block(new NavBlock());
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$page->add_block(new Block("Resize Image", $html, "main", 20));
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}
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}
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?>
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