Bug 129308

Summary: Not reading EMF+ EmfPlusPath records correctly
Product: LibreOffice Reporter: Chris Sherlock <chris.sherlock79>
Component: graphics stackAssignee: Chris Sherlock <chris.sherlock79>
Status: RESOLVED INSUFFICIENTDATA    
Severity: normal CC: chris.sherlock79, gang65, xiscofauli
Priority: medium Keywords: filter:emf
Version: Inherited From OOo   
Hardware: All   
OS: All   
Whiteboard:
Crash report or crash signature: Regression By:
Bug Depends on:    
Bug Blocks: 55058, 103859, 129138    
Attachments: EMF+ Joint line

Description Chris Sherlock 2019-12-10 11:55:57 UTC
Description:
When we read EMF+ EmfPlusPath records, we are not reading the point types correctly when we use points that use relative locations.

According to [MS-EMFPLUS] section "2.2.1.6 EmfPlusPath Object":

"PathPointTypes (variable): An array of PathPointCount objects that specifies how the points in the PathPoints field are used to draw the path. The type of objects in this array is specified by the PathPointFlags field, as follows:

- If the R flag is set, the point types are specified by EmfPlusPathPointTypeRLE objects, which use run-length encoding (RLE) compression ([MS-WMF] section 3.1.6).

- If the R flag is clear, the point types are specified by EmfPlusPathPointType objects."

Currently we are handling the second case (where the R flag is clear), but we are not handline the case where the R flag is set. In that case we should be reading an EmfPlusPathPointTypeRLE, but this is not the case. 

Steps to Reproduce:
This needs a test case document, unfortunately I don't have one readily at hand.

Actual Results:
See above. 

Expected Results:
See above. 


Reproducible: Always


User Profile Reset: No



Additional Info:
Comment 1 Bartosz 2019-12-10 19:31:20 UTC
Hello Chris.
Do you have example EMF+ image which demonstrate using of such PathPointTypes?
It will be really hard to verify if it is working correctly without some reference image.
Comment 2 Bartosz 2019-12-10 19:32:26 UTC
I will try to create such image.
Comment 3 Bartosz 2019-12-23 21:33:20 UTC
Created attachment 156763 [details]
EMF+ Joint line

It seems that joints are not rendered correctly,
code:

			GraphicsPath path;
			Pen penJoin(Color(255, 0, 0, 255), 8);

			path.StartFigure();
			path.AddLine(Point(50, 200), Point(100, 200));
			path.AddLine(Point(100, 200), Point(100, 250));

			penJoin.SetLineJoin(LineJoinBevel);
			graphics.DrawPath(&penJoin, &path);
Comment 4 Chris Sherlock 2019-12-30 05:57:52 UTC
Bartosz, that's a different issue I'm afraid. We don't seem to correctly support bevelled lines correctly, but that's a different issue to EmfPlusPath objects. 

Might be worthwhile logging a new bug about mitering (we currently don't support SETMITERLIMIT).
Comment 5 QA Administrators 2019-12-31 03:28:24 UTC Comment hidden (obsolete)
Comment 6 Xisco Faulí 2020-01-10 11:28:31 UTC
Hello Chris,
Could you please attach a screenshot showing how the file should look like ?
Comment 7 QA Administrators 2020-07-09 03:42:03 UTC Comment hidden (obsolete)
Comment 8 QA Administrators 2020-08-09 04:08:58 UTC
Dear Chris Sherlock,

Please read this message in its entirety before proceeding.

Your bug report is being closed as INSUFFICIENTDATA due to inactivity and
a lack of information which is needed in order to accurately
reproduce and confirm the problem. We encourage you to retest
your bug against the latest release. If the issue is still
present in the latest stable release, we need the following
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