office-gobmx/xmloff
Patrick Luby 3da1d8a791 tdf#161833 treat semi-transparent pixels as opaque
Limiting the contour wrapping polygon to only opaque pixels
causes clipping of any shadows or other semi-transaprent
areas in the image. So, instead of testing for fully opaque
pixels, treat pixels that are not fully transparent as opaque.

Also, tdf#161833 would cause semi-transparent pixels to be
treated as fully transparent pixels when calculating the wrap
contour for an image. To force the correct contour when loading
a document, force the contour to be recalculated by ignoring
the saved polygon if the contour is set to "recreate on edit".

Change-Id: Ibe256f54e1c82de30c2b7d5b92a69344b4a7ba10
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/169745
Reviewed-by: Patrick Luby <guibomacdev@gmail.com>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
2024-07-04 13:50:16 +02:00
..
documentation
dtd
inc
qa tdf#161483 enable LO to read ODF angle units 2024-06-25 16:21:42 +02:00
source tdf#161833 treat semi-transparent pixels as opaque 2024-07-04 13:50:16 +02:00
util
CppunitTest_xmloff_draw.mk
CppunitTest_xmloff_style.mk
CppunitTest_xmloff_text.mk
CppunitTest_xmloff_uxmloff.mk
CustomTarget_generated.mk
IwyuFilter_xmloff.yaml
JunitTest_xmloff_unoapi.mk
Library_xo.mk
Library_xof.mk
Makefile
Module_xmloff.mk
Package_dtd.mk
README.md

ODF Import and Export Filter Logic

The main library "xo" contains the basic ODF import/export filter implementation for most applications. The document is accessed via its UNO API, which has the advantage that the same import/export code can be used for text in all applications (from/to Writer/EditEngine). The filter consumes/produces via SAX UNO API interface (implemented in "sax"). Various bits of the ODF filters are also implemented in applications, for example [git:sw/source/filter/xml].

There is a central list of all element or attribute names in [git:include/xmloff/xmltoken.hxx]. The main class of the import filter is SvXMLImport, and of the export filter SvXMLExport.

The Import filter maintains a stack of contexts for each element being read. There are many classes specific to particular elements, derived from SvXMLImportContext.

Note that for export several different versions of ODF are supported, with the default being the latest ODF version with "extensions", which means it may contain elements and attributes that are only in drafts of the specification or are not yet submitted for specification. Documents produced in the other (non-extended) ODF modes are supposed to be strictly conforming to the respective specification, i.e., only markup defined by the ODF specification is allowed.

There is another library "xof" built from the source/transform directory, which is the filter for the OpenOffice.org XML format. This legacy format is a predecessor of ODF and was the default in OpenOffice.org 1.x versions, which did not support ODF. This filter works as a SAX transformation from/to ODF, i.e., when importing a document the transform library reads the SAX events from the file and generates SAX events that are then consumed by the ODF import filter.

OpenOffice.org XML File Format

There is some stuff in the "dtd" directory which is most likely related to the OpenOffice.org XML format but is possibly outdated and obsolete.

Add New XML Tokens

When adding a new XML token, you need to add its entry in the following three files:

  • [git:include/xmloff/xmltoken.hxx]
  • [git:xmloff/source/core/xmltoken.cxx]
  • [git:xmloff/source/token/tokens.txt]