Re: [Libwpg-devel] [wp-dev] SoC WPG conversion: progress as of June 5, 2006

[Fridrich S. <fri...@bl...>]

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Hi, Robert,

Robert Steinmetz wrote:
> You mention WPG1 and WPG2. I'm not clear on the meaning of these
> designations. Are they flavors or sequential versions?

Although my limited English is not understanding the difference between
flavours and sequential versions, I might have the information that you
ask for in this one :-)
WPG1 is the WordPerfect Graphics file format version one as used in
documents produced by WordPerfect 5.x (or other Corel applications).
WPG2 is the WordPerfect Graphics file format version two that is used in
documents produced by WordPerfect 6.0 and subsequent versions. Although
the two can have some common logic (the apple is never falling too far
from the apple tree), they have such difference that a parser parsing
one format cannot parse the other. The record structure is slightly
different, but the most important, the way records are chained is quite
novel in WPG2. I hope this answers this part of the question

> I have understood that wpg files, in every version, come in two flavors,
> raster and vector. If that is the case, is it the intent of this project
> to develop a converter for both?

Both WPG1 and WPG2 files *can* contain in the same time vector graphics,
bitmap data and embedded graphics of other mime-types. In WPG1, there
are two sorts of bitmap records. Although, it is  possible that some
documents will contain only one type of data, it is not the rule and a
parser designed to read WPG cannot assume this.

> I had understood that the initial effort was directed first at the
> raster flavor. That clearly has implications for the type output of the
> filter can create. Raster and vector files are very different and most
> file formats are either one or the other.

The work done before Ariya started his SoC project was mainly to convert
the vector graphics information inside WPG1 files, since it was kind of
easier. Libwpg CVS has a tool called wpg2svg that allows to visualize
the result of this conversion in applications that support SVG.
Although, SVG is primary designed to contain vector graphics, it can
embed also bitmap graphics, as can be seen in this proof-of-concept
document: http://hei.unige.ch/~strba5/mmeeks/fridrich-base64.svg :-)

I see now that Ariya also answered your questions. But I will hit the
"Send" button anyway ;-)

Cheers

Fridrich
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