[Bug 60656] EMF image support in slideshows

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=60656

--- Comment #15 from Andreas Beeker <ki...@apache.org> ---
Created attachment 37144
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=37144&action=edit
Sample.wmf with wrong text reference

A sample wmf (which also affects EMF rendering), which causes rendering errors

Applied via r1876136

- fixed WmfExtTextOut dx handling for variable text spacing
- fixed WmfExtTextOut text position for (0,0) references based on the
current/last path location
- fixed WmfExtTextOut handling of symbol/wingdings charset (move ascii to
unicode private area, because Java font loader maps the glyphs there) - and use
existing workaround if the fonts aren't installed, i.e. use corresponding
unicode characters of the logcial font then
- provide option in PPTX2PNG to use given file input type, if the file magic is
unknown
- provide option in PPTX2PNG to render text as shapes in SVG, as dx handling
(see above) implemented via TextAttribute.TRACKING is not supported by batik 

source of the sample.wmf, which I've used:
https://stackoverflow.com/questions/58726194/svg-rendering-with-batik-produce-broken-image

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