[Printing-architecture] OPVP spec RC4

[Osamu MIHARA]

Hi,

Toratani-san has posted the latest update of vector driver API spec.  It 
is the result of big efforts of OPWG Japan members in these several months.

ftp://ftp.pwg.org/pub/pwg/fsg/vector/pdapi-spec-1.0rc4.odt
ftp://ftp.pwg.org/pub/pwg/fsg/vector/pdapi-spec-1.0rc4.pdf

Massive parts are reviewed and improved.  The change list is not 
attached at the end of the document, due to the time limitation, here is 
the main changes since RC2/RC3.

# Toratani-san, we should make a document to describe the changes
# of spec from version 0.2 to 1.0.

- Improve English expressions.

- Rewrite introduction section.

- Raster operation (ROP) functions are removed, since it does not 
directly reflect the graphics model of PDF or PostScript. Because the 
mapping scheme of superposition of graphical elements from 
PDF/PostScript to ROP is ambiguous in the previous spec., and it causes 
some artifact problems with vector printer driver implementations.  We 
review the related functions carefully and confirmed that ROP is not 
essential factor for our model and removing it does not cause problems 
in the aspect of function and performance.

- Remove unnecessary sentences and paragraphs.

- All descriptions are rewritten to remove ambiguities, using RFC2119 
definition (MUST/SHOULD/MAY...).

- Parameters for bitmaps and brushes are reviewed and rearranged.

- Some figures are added for clarification of concepts of functions.

- Etc. etc. etc.....

Please review the spec. and post the feedback to this mailing list.

Thank you!

-- 
   Osamu Mihara // Fuji Xerox