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Re: [pdf-devel] DCT implemenet
From: |
gerel |
Subject: |
Re: [pdf-devel] DCT implemenet |
Date: |
Sat, 06 Dec 2008 13:53:10 -0800 (PST) |
> Date: Sat, 6 Dec 2008 11:52:42 +0800
> From: "=?GB2312?B?0e6zo7uq?=" <address@hidden>
>
> ------=_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