Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# WMF/EMF/EMF+ Reader
+
+## Introduction
+The **emfio** module is used to read **WMF** (Windows Metafile), **EMF**
+(Enhanced Metafiles) and also **EMF+** (enhanced EMF) files [1], which are
+binary formats for vector images from Microsoft. These files can contain vector
+graphics, bitmap components and text.
+
+This folder contains `emfio/source/reader` which is used for reading the
+WMF/EMF/EMF+ files, either directly, or inside a document. For embedding Windows
+Metafiles inside a document, one can use "Insert -> Picture -> From File" to put
+such a file into the document. It is possible to export the Windows Metafile
+by using right click and choose "save".
+
+Most of the records of WMF/EMF formats come from the Windows Graphics Device.
+For Interface (GDI) API and EMF+ they come from the newer Windows GDI+.
+
+More information about rendering Windows Metafiles can be found in the
+[Visual Class Library (VCL)](../vcl) and also in the
+[GDIMetaFile](../vcl/README.GDIMetaFile) documentation.
+
+An example demo that renders a metafile using `vcl` be seen by invoking:
+
+    ./bin/run mtfdemo odk/examples/basic/forms_and_controls/burger.wmf
+
+This opens the burger.wmf file from the ODK examples.
+
+It is also possible to dump metaactions created as the intermediary format
+before rendering the metafile using:
+
+    ./bin/run mtfdemo -d odk/examples/basic/forms_and_controls/burger.wmf
+
+If the command is successful, this message will be shown, and metadump.xml will
+be put in the current folder:
+
+"Dumped metaactions as metadump.xml"
+
+The demo code structure is described in [GDIMetaFile](../vcl/README.GDIMetaFile)
+documentation.
+
+[1] [Windows Meta File](https://en.wikipedia.org/wiki/Windows\_Metafile),
+Wikipedia
+
+## EMF+ Specifics
+Handling EMF+ is to some extent different from handling WMF/EMF. More
+information can be found in the [VCL](../vcl)
+documentation.
+
+## How does it work?
+`emfio` module takes a byte array and turns it into a `drawinglayer` primitive container. The rendering is done via `drawinglayer` primitives. For more information, you should refer to [VCL](../vcl) documentation.
+
+The drawinglayer primitives created to draw the emf/wmf files can be dumped as
+xml for debugging purposes. For more information, please refer to the
+[drawinglayer](../drawyinglayer) documentation.
+
+## Limitations
+Not all the WMF/EMF/EMF+ records are supported by this module. Unsupported
+records are marked as "not implemented", and a warning message will printed
+if they are actually read within a file. You can file a bug report for
+implementing these records.
+
+Currently, these records are not implemented for WMF (specified in
+`wmfreader.cxx`):
+
+```
+W_META_SETRELABS W_META_SETPOLYFILLMODE W_META_SETSTRETCHBLTMODE
+W_META_SETTEXTCHAREXTRA W_META_SETTEXTJUSTIFICATION W_META_FLOODFILL
+W_META_FILLREGION W_META_FRAMEREGION W_META_INVERTREGION
+W_META_PAINTREGION W_META_DRAWTEXT W_META_SETMAPPERFLAGS
+W_META_SETDIBTODEV W_META_REALIZEPALETTE W_META_ANIMATEPALETTE
+W_META_SETPALENTRIES W_META_RESIZEPALETTE W_META_EXTFLOODFILL
+W_META_RESETDC W_META_STARTDOC W_META_STARTPAGE W_META_ENDPAGE
+W_META_ABORTDOC W_META_ENDDOC
+```
+
+And these records are not implemented for EMF/EMF+ (specified in `emfreader.cxx`):
+
+```
+EMR_MASKBLT EMR_PLGBLT EMR_SETDIBITSTODEVICE EMR_FRAMERGN
+EMR_INVERTRGN EMR_FLATTENPATH EMR_WIDENPATH EMR_POLYDRAW
+EMR_SETPALETTEENTRIES EMR_RESIZEPALETTE
+EMR_EXTFLOODFILL EMR_ANGLEARC EMR_SETCOLORADJUSTMENT EMR_POLYDRAW16
+EMR_CREATECOLORSPACE EMR_SETCOLORSPACE EMR_DELETECOLORSPACE
+EMR_GLSRECORD EMR_GLSBOUNDEDRECORD EMR_PIXELFORMAT EMR_DRAWESCAPE
+EMR_EXTESCAPE EMR_STARTDOC EMR_SMALLTEXTOUT EMR_FORCEUFIMAPPING
+EMR_NAMEDESCAPE EMR_COLORCORRECTPALETTE EMR_SETICMPROFILEA
+EMR_SETICMPROFILEW EMR_TRANSPARENTBLT EMR_TRANSPARENTDIB
+EMR_GRADIENTFILL EMR_SETLINKEDUFIS EMR_SETMAPPERFLAGS EMR_SETICMMODE
+EMR_CREATEMONOBRUSH EMR_SETBRUSHORGEX EMR_SETMETARGN EMR_SETMITERLIMIT
+EMR_EXCLUDECLIPRECT EMR_REALIZEPALETTE EMR_SELECTPALETTE
+EMR_CREATEPALETTE EMR_ALPHADIBBLEND EMR_SETTEXTJUSTIFICATION
+```
+
+Due to the difference on the fonts available on various platforms, the outcome
+of text rendering can be different on Linux, Windows, macOS and elsewhere.
+
+## Known Bugs
+Known remaining bugs for this module is gathered here:
+
+* [Bug 103859 \[META\] EMF/WMF (Enhanced/Windows Metafile) bugs and
+enhancements](https://bugs.documentfoundation.org/show\_bug.cgi?id=103859)
+
+## Dependencies
+The direct dependency for **emfio** is [**drawinglayer**](../drawinglayer). The
+complete list of dependencies including the indirect dependencies is as below:
+```
+basegfx drawinglayer cppu cppuhelper sal comphelper tl salhelper vcl svt utl
+```
+
+## Tools
+Several tools are available for inspecting WMF/EMF/EMF+ files, which are binary
+formats. Some of them are:
+
+* [mso-dumper](https://git.libreoffice.org/mso-dumper/): Reads and dumps various
+  binary formats from Microsoft including WMF/EMF/EMF+. The output is in a
+  custom XML format. emf-dump.py and wmf-dump.py are usable.
+* [RE-lab (Formerly OLEToy)](https://github.com/renyxa/re-lab): Reads, dumps and
+modifies several binary formats from Microsoft including WMF/EMF/EMF+, and also
+other companies.
+* [EMF+ diagnostics reporting tool](https://github.com/chrissherlock/emfplus-decoder)
+* [limerest](https://gitlab.com/re-lab-project/limerest): A new gui tool based
+on OLEToy for working with various binary formats
+
+## Related Software
+* [libemf](http://libemf.sourceforge.net/)
+* [libwmf](https://github.com/caolanm/libwmf)
+
+## References
+Documentation for WMF/EMF/EMF+ formats are available on Microsoft website:
+
+* [\[MS-WMF\]: Windows Metafile Format](https://docs.microsoft.com/en-us/openspecs/windows\_protocols/ms-wmf/4813e7fd-52d0-4f42-965f-228c8b7488d2)
+* [\[MS-EMF\]: Enhanced Metafile Format](https://docs.microsoft.com/en-us/openspecs/windows\_protocols/ms-emf/91c257d7-c39d-4a36-9b1f-63e3f73d30ca)
+* [\[MS-EMFPLUS\]: Enhanced Metafile Format Plus Extensions](https://docs.microsoft.com/en-us/openspecs/windows\_protocols/ms-emfplus/5f92c789-64f2-46b5-9ed4-15a9bb0946c6)