[dev] Horde_Image / polaroid-like stack

[Chuck Hagenbuch]

Quoting Michael Rubinsky <mike at theupstairsroom.com>:

> Starting to play around with implementing the "Polaroid style" stack  
>  (at least using IM or Imagick extension - the gd driver looks like  
> it  will be pretty tough).  Anyway, wanted to throw some ideas out  
> there  and get some opinions...
>
> 1) Add a type of thumbnailStack() method to Horde_Image_*:
>
>     function thumbnailStack($images, $w, $h)
>
> where $images is an array of various sized images, $w, $h are   
> dimensions for the thumbnails. The image that the Horde_Image object  
>  represents will serve as the "desk" image to place the thumbnails on.
>
> 2) Don't implement this in Horde_Image at all - do it in Ansel using  
>  IM/Imagick extension or if that's not present, revert to a single   
> thumbnail like we do now.

I don't think that there should be a Horde_Image::thumbnailStack  
method; that seems much too specialized to be part of the Horde_Image  
api. If you can break down the necessary operations into generic  
Horde_Image::* calls, then you could create a separate object - either  
a Horde_Image_Decorator, or some other composite - that made it work.

-chuck