Add very simple graphics toolkits.

Track a set of rules in Graphics_Rule_Model which specify how we turn
original images into thumbnails and resizes.  There's one set of rules
that applies to every image in the Gallery.

Track the state of thumbs and resizes with a "dirty" bit.  The new
graphics helper manages the rules and can rebuild the thumbs and
resizes for any images that are considered "dirty".

Introduce the concept of an "album cover" which is an item that an
album points to.  We'll use that item as the source for the album's
thumbnail/resize.

Conflated with this change (sorry!) I also changed the Var table to
use module_name instead of module_id.  This may be marginally less
efficient, but it's much easier to follow in the database.

1 files changed, 16 insertions, 42 deletions

diff --git a/core/models/item.php b/core/models/item.php
index d71414d8..cd2e1670 100644
--- a/core/models/item.php
+++ b/core/models/item.php
@@ -153,48 +153,6 @@ class Item_Model extends ORM_MPTT {
   }
 
   /**
-   * Build a thumbnail for this item from the image provided with the
-   * given width and height
-   *
-   * @chainable
-   * @param string $filename the path to an image
-   * @param integer $width the desired width of the thumb
-   * @param integer $height the desired height of the thumb
-   * @return ORM
-   */
-  public function set_thumb($filename, $width, $height) {
-    Image::factory($filename)
-      ->resize($width, $height, Image::AUTO)
-      ->save($this->thumb_path());
-
-    $dims = getimagesize($this->thumb_path());
-    $this->thumb_width = $dims[0];
-    $this->thumb_height = $dims[1];
-    return $this;
-  }
-
-  /**
-   * Build a resize for this item from the image provided with the
-   * given width and height
-   *
-   * @chainable
-   * @param string $filename the path to an image
-   * @param integer $width the desired width of the resize
-   * @param integer $height the desired height of the resize
-   * @return ORM
-   */
-  public function set_resize($filename, $width, $height) {
-    Image::factory($filename)
-      ->resize($width, $height, Image::AUTO)
-      ->save($this->resize_path());
-
-    $dims = getimagesize($this->resize_path());
-    $this->resize_width = $dims[0];
-    $this->resize_height = $dims[1];
-    return $this;
-  }
-
-  /**
    * Return the relative path to this item's file.
    * @return string
    */
@@ -250,4 +208,20 @@ class Item_Model extends ORM_MPTT {
     }
     return parent::save();
   }
+
+  /**
+   * Return the Item_Model representing the cover for this album.
+   * @return Item_Model or null if there's no cover
+   */
+  public function album_cover() {
+    if ($this->type != "album") {
+      return null;
+    }
+
+    if (empty($this->album_cover_item_id)) {
+      return null;
+    }
+
+    return model_cache::get("item", $this->album_cover_item_id);
+  }
 }