From 14bfa8b32376dda39555fe925a5f97b768e25af4 Mon Sep 17 00:00:00 2001
From: "green-ponies (jgen)" <jgen.tech@gmail.com>
Date: Sat, 3 Sep 2011 23:13:41 -0400
Subject: [PATCH] Working on Image Resize feature.
---
ext/resize/main.php | 233 +++++++++++++++++++++++++++++++++++++++++++
ext/resize/theme.php | 56 +++++++++++
2 files changed, 289 insertions(+)
create mode 100644 ext/resize/main.php
create mode 100644 ext/resize/theme.php
diff --git a/ext/resize/main.php b/ext/resize/main.php
new file mode 100644
index 00000000..0d2e1d50
--- /dev/null
+++ b/ext/resize/main.php
@@ -0,0 +1,233 @@
+<?php
+/*
+ * Name: Image Resize
+ * Author: jgen <jgen.tech@gmail.com>
+ * Description: Allows admins to resize uploaded 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.
+ *
+ */
+
+/**
+ * This class is just a wrapper around SCoreException.
+ */
+class ImageResizeException extends SCoreException {
+ var $error;
+
+ public function __construct($error) {
+ $this->error = $error;
+ }
+}
+
+/**
+ * This class handles image resize requests.
+ */
+class ResizeImage extends SimpleExtension {
+
+ public function onInitExt($event) {
+ global $config;
+ $config->set_default_bool('resize_enabled', true);
+ $config->set_default_int('resize_default_width', 0);
+ $config->set_default_int('resize_default_height', 0);
+ }
+
+ public function onImageAdminBlockBuilding($event) {
+ global $user, $config;
+ if($user->is_admin() && $config->get_bool("resize_enabled")) {
+ /* Add a link to resize the image */
+ $event->add_part($this->theme->get_resize_html($event->image->id));
+ }
+ }
+
+ public function onSetupBuilding($event) {
+ $sb = new SetupBlock("Image Resize");
+ $sb->add_bool_option("resize_enabled", "Allow resizing images: ");
+ $sb->add_label("<br>Preset/Default Width: ");
+ $sb->add_int_option("resize_default_width");
+ $sb->add_label(" px");
+ $sb->add_label("<br>Preset/Default Height: ");
+ $sb->add_int_option("resize_default_height");
+ $sb->add_label(" px");
+ $sb->add_label("<br>(enter 0 for no default)");
+ $event->panel->add_block($sb);
+ }
+
+ public function onPageRequest($event) {
+ global $page, $user;
+
+ if ( $event->page_matches("resize") && $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 ImageResizeException("Can not resize Image: No valid Image ID given.");
+ }
+
+ $image = Image::by_id($image_id);
+ if(is_null($image)) {
+ $this->theme->display_error($page, "Image not found", "No image in the database has the ID #$image_id");
+ } else {
+
+ /* Check if options were given to resize an image. */
+ if (isset($_POST['resize'])) {
+
+ /* get options */
+
+ $width = $height = 0;
+
+ if (isset($_POST['resize_width'])) {
+ $width = int_escape($_POST['resize_width']);
+ }
+ if (isset($_POST['resize_height'])) {
+ $width = int_escape($_POST['resize_height']);
+ }
+
+ /* Attempt to resize the image */
+ try {
+ $this->resize_image($image, $width, $height);
+ } catch (ImageResizeException $e) {
+ $this->theme->display_resize_error($page, "Error Resizing", $e->error);
+ }
+ } else {
+ /* Display options for resizing */
+ $this->theme->display_resize_page($page, $image_id);
+ }
+ }
+ }
+ }
+
+
+ // Private functions
+
+ /*
+ This function could be made much smaller by using the ImageReplaceEvent
+ ie: Pretend that we are replacing the image with a resized copy.
+ */
+ private function resize_image($image, $width, $height) {
+ global $config;
+ global $user;
+ global $page;
+ global $database;
+
+ if ( $height <= 0 && $width <= 0 ) {
+ throw new ImageResizeException("Invalid options for height and width.");
+ }
+
+ $id = $image->id;
+ $hash = $image->hash;
+ if (is_null($hash)) {
+ throw new ImageResizeException("Image does not have a hash associated with it.");
+ }
+
+ $image_filename = warehouse_path("images", $hash);
+ $info = getimagesize($image_filename);
+
+ if (($image->width != $info[0] ) || ($image->height != $info[1])) {
+ throw new ImageResizeException("The image size does not match what is in the database! - Aborting Resize.");
+ }
+
+ /* Check memory usage limits */
+ $memory_use = (filesize($image_filename)*2) + ($width*$height*4) + (4*1024*1024);
+ $memory_limit = get_memory_limit();
+
+ if ($memory_use > $memory_limit) {
+ throw new ImageResizeException("The image is too large to resize given the memory limits. ($memory_use > $memory_limit)");
+ }
+
+ /* Calculate the new size of the image */
+ if ( $height > 0 && $width > 0 ) {
+ $new_height = $height;
+ $new_width = $width;
+ } else {
+ // Scale the new image
+ if ($width == 0) $factor = $height/$image->height;
+ elseif ($height == 0) $factor = $width/$image->width;
+ else $factor = min( $width / $image->width, $height / $image->height );
+
+ $new_width = round( $image->width * $factor );
+ $new_height = round( $image->height * $factor );
+ }
+
+ /* 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 ImageResizeException("Unsupported image type.");
+ }
+
+ /* Resize and resample the image */
+ $image_resized = 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_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
+ imagefill($image_resized, 0, 0, $transparency);
+ imagecolortransparent($image_resized, $transparency);
+ }
+ elseif ($info[2] == IMAGETYPE_PNG) {
+ imagealphablending($image_resized, false);
+ $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
+ imagefill($image_resized, 0, 0, $color);
+ imagesavealpha($image_resized, true);
+ }
+ }
+ imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $new_width, $new_height, $image->width, $image->height);
+
+ /* Delete original image and thumbnail */
+ log_debug("image", "Removing image with hash ".$hash);
+ $image->remove_image_only();
+
+ /* Temp storage while we resize */
+ $tmp_filename = tempnam("/tmp", 'shimmie_resize_'.time());
+ if (empty($tmp_filename)) {
+ throw new ImageResizeException("Unable to save temporary image file.");
+ }
+
+ /* Output to the same format as the original image */
+ switch ( $info[2] ) {
+ case IMAGETYPE_GIF: imagegif($image_resized, $tmp_filename); break;
+ case IMAGETYPE_JPEG: imagejpeg($image_resized, $tmp_filename); break;
+ case IMAGETYPE_PNG: imagepng($image_resized, $tmp_filename); break;
+ default:
+ throw new ImageResizeException("Unsupported image type.");
+ }
+
+
+ /* Regenerate thumbnail */
+
+
+ unlink($tmp_filename);
+
+
+ /* Update the database */
+ $database->Execute(
+ "UPDATE images SET
+ filename = :filename, filesize = :filesize, hash = :hash,
+ ext = :ext, width = :width, height = :height, source = :source
+ WHERE
+ id = :id
+ ",
+ array(
+ "filename"=>$image_new->filename, "filesize"=>$image->filesize, "hash"=>$image->hash,
+ "ext"=>$image->ext, "width"=>$image->width, "height"=>$image->height, "source"=>$image->source,
+ "id"=>$id
+ )
+ );
+
+
+
+ log_info("resize", "Resized Image #{$image->id}");
+
+ }
+}
+?>
diff --git a/ext/resize/theme.php b/ext/resize/theme.php
new file mode 100644
index 00000000..853274d1
--- /dev/null
+++ b/ext/resize/theme.php
@@ -0,0 +1,56 @@
+<?php
+
+class ResizeImageTheme extends Themelet {
+ /*
+ * Display a link to resize an image
+ */
+ public function get_resize_html($image_id) {
+ global $user;
+ global $config;
+
+ $i_image_id = int_escape($image_id);
+
+ $html = "
+ ".make_form(make_link("resize"),'POST',false,'resize_image')."
+ <input type='hidden' name='image_id' value='$i_image_id' />
+ <input type='submit' value='Resize' id='resize_image_submit' />
+ </form>
+ ";
+
+ return $html;
+ }
+
+ public function display_resize_error(Page $page, $title, $message) {
+ $page->add_block(new Block($title, $message));
+ }
+
+ public function display_resize_page(Page $page, $image_id) {
+ global $config;
+
+ $default_width = $config->get_int('resize_default_width');
+ $default_height = $config->get_int('resize_default_height');
+
+ $image = Image::by_id($image_id);
+ $thumbnail = $this->build_thumb_html($image, null);
+
+ $html = "<p>Resize Image ID ".$image_id."<br>".$thumbnail."</p>
+ <p>Please note: You will have to refresh the image page, or empty your browser cache.</p>
+ <p>Enter the new size for the image, or leave blank to scale the image automatically.</p><br>"
+ .make_form(make_link('resize/'.$image_id), 'POST', $multipart=True,'form_resize')."
+ <input type='hidden' name='image_id' value='$image_id'>
+ <table id='large_upload_form'>
+ <tr><td>New Width</td><td colspan='3'><input id='resize_width' name='resize_width' type='text' value='".$default_width."'></td></tr>
+ <tr><td>New Height</td><td colspan='3'><input id='resize_height' name='resize_height' type='text' value='".$default_height."'></td></tr>
+ <tr><td colspan='4'><input id='resizebutton' type='submit' value='Resize'></td></tr>
+ </table>
+ </form>
+ ";
+
+ $page->set_title("Resize Image");
+ $page->set_heading("Resize Image");
+ $page->add_block(new NavBlock());
+ $page->add_block(new Block("Resize Image", $html, "main", 20));
+
+ }
+}
+?>