From owner-freebsd-ports  Tue May 15 11: 6:46 2001
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Date: Tue, 15 May 2001 14:06:33 -0400 (EDT)
Reply-To: mi@aldan.algebra.com
Subject: Re: GhostScript and JPEG
To: kellyzg@hotmail.com
Cc: ghost@aladdin.com, ports@freebsd.org, andreas@freebsd.org,
	raph@artofcode.com, jseger@freebsd.org
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On 15 May, Leonard K. wrote:
> 
> On Tue, 15 May 2001, Mikhail Teterin wrote:
>>
>> Ok, this is  an argument to keep C_MAX_BLOCKS_IN_MCU at  10, but to bump
>> up the  D_... to 64.  Any objections to me  applying this change  to the
>> jpeg  port? (JSeger  seems  to be  off-line  for months  :(  ) Then  the
>> ghostscript ports can be modified to the shared jpeg library.
> 
> Just out of curiosity: if we bump the jpeg library's 'max block' to 64,
> and I use the library to write a new jpeg file (using maybe xv),
> would the new file be sometimes non-standard-compliant and thus be
> rejected by some viewers ?

My understanding is, no. To produce a non-compliant jpeg, you need the
value of C_MAX_BLOCKS_IN_MCU (Compress) increased. D_MAX_BLOCKS_IN_MCU
is for the Decompressor.

> If so, then in my humble opinion I think we need to keep jpeg library
> the way it is, and let ghostscript fend for itself.

No, I think it is safe to bump up D_MAX_BLOCKS_IN_MCU.

	-mi



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