> Date: Sat, 6 Dec 2008 11:52:42 +0800 > From: "=?GB2312?B?0e6zo7uq?=" <[EMAIL PROTECTED]> > > ------=_Part_32627_28535755.1228535562541 > Content-Type: text/plain; charset=ISO-8859-1 > Content-Transfer-Encoding: 7bit > Content-Disposition: inline > > Hi, > > I'm writing DCT filter.I've some issues to discuss with you. > > 1. For the base layer, should the input and output be file or memory? Or > both? > > 2. How to get the parameters for encode, e.g. the image size? If in the hash > table filter_params, should I add the key name of the parameters in > pdf-stm.h? >
Hi Yank, for both questions I recommend you to read some already implemented filter like, pdf-f-ahex. I'll give you some hints anyways. The input and output are two buffers, whether on disk or memory should not be of your concern. You can read more here: http://gnupdf.org/Lib:Architecture/Base_Layer/Stream_Module#Buffers Regarding the parameters you only ask for the key, as it's supposed to be already added prior the filter's call. Hope it helps, -gerel
