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diff --git a/filter/README.md b/filter/README.md new file mode 100644 index 000000000..19caeb73e --- /dev/null +++ b/filter/README.md @@ -0,0 +1,25 @@ +# LibreOffice Filters + +Filter registration and some simple filters (also descriptions). + +Desperate splitting of code into small shared libraries for historical +reasons presumably (OS/2 and Windows 3.x). The libraries produced from +the code in each subdirectory of `filter/source/graphicfilter` are +graphic format import or export filters. But they don't have uniform +API. Some have either a `GraphicImport` or `GraphicExport` entry point, +and are loaded and used in a uniform fashion from code in +`svtools/source/filter/filter.cxx`. Others have different API and are +loaded from other places. For instance `icgm` has `ImportCGM`, and is +loaded and used by `sd/source/filter/cgm/sdcgmfilter.cxx` (!). +Svgreader is used for "File -> Open" and then to choose the svg file. +For "Insert -> Picture -> From File", see `svgio/source/svgreader` directory. + +## Filter Configuration + +The filter configuration consists of two parts, the type definition in +`filter/source/config/fragments/types/` and the actual filter definition +in `filter/source/config/fragments/filters/`. + +Each file type e.g. text file should be represented by exactly one +type definition. This type can then be referenced by several different +filters, e.g. calc text, writer text. |