Review Request: Implement a playback device context for EMF and the start of an EMFPLUS parser.

[Inge Wallin]

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http://git.reviewboard.kde.org/r/102716/
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Review request for Calligra and Thorsten Zachmann.


Description
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This patch does two things:
 - It implements the concept of the Playback Device Context into libemf
 - It contains a start of an EMFPLUS parser.

The device context is a struct of data that is kept during the playback of an EMF metafile. It contains graphics state variables like current colors (text, background, foreground), current brush, pen, raster operation, etc as well as some bigger things. Previously all this was kept in the QPainter backend that is used to paint the content of the EMF to a QPaintDevice.

With the new explicit device context, that is kept by the parser, we get two advantages:
 1. It is much easier to write new backends, so e.g. a karbon import filter for EMF will be almost trivial
 2. We can implement EMFPLUS, which is the next generation EMF from Microsoft, since EMFPLUS demands transfer of device contexts.

This patch is tested in every commit along the way, but only on a limited set of documents, by hand by me. the reason for this commit request is that Zagge promised to make a big cstester run if I put it up for review. I would like to merge this patch on thursday at the latest, since the tagging of beta2 is on friday.

The new EMFPLUS parser is still work in progress and not called yet, so there is no real need to review that.


Diffs
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  plugins/vectorshape/CMakeLists.txt da25dbb 
  plugins/vectorshape/VectorShape.cpp c14e6a7 
  plugins/vectorshape/libemf/CMakeLists.txt 7824052 
  plugins/vectorshape/libemf/EmfAbstractBackend.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfAbstractBackend.cpp PRE-CREATION 
  plugins/vectorshape/libemf/EmfDebugBackend.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfDebugBackend.cpp PRE-CREATION 
  plugins/vectorshape/libemf/EmfDeviceContext.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfDeviceContext.cpp PRE-CREATION 
  plugins/vectorshape/libemf/EmfEnums.h 1b15344 
  plugins/vectorshape/libemf/EmfOutput.h 7b247af 
  plugins/vectorshape/libemf/EmfOutput.cpp df3332a 
  plugins/vectorshape/libemf/EmfOutputDebugStrategy.h af3dc21 
  plugins/vectorshape/libemf/EmfOutputDebugStrategy.cpp 4f1d87c 
  plugins/vectorshape/libemf/EmfOutputPainterStrategy.h 8e37d42 
  plugins/vectorshape/libemf/EmfOutputPainterStrategy.cpp fcf6822 
  plugins/vectorshape/libemf/EmfPainterBackend.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfPainterBackend.cpp PRE-CREATION 
  plugins/vectorshape/libemf/EmfParser.h f376dc2 
  plugins/vectorshape/libemf/EmfParser.cpp a8d54fa 
  plugins/vectorshape/libemf/EmfplusDeviceContext.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfplusDeviceContext.cpp PRE-CREATION 
  plugins/vectorshape/libemf/EmfplusEnums.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfplusParser.h PRE-CREATION 
  plugins/vectorshape/libemf/EmfplusParser.cpp PRE-CREATION 
  plugins/vectorshape/libemf/TODO cde117e 

Diff: http://git.reviewboard.kde.org/r/102716/diff/diff


Testing
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Testing all commits with a limited set of test files that I keep.


Thanks,

Inge Wallin

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