[Bug 30951] New: mono's GraphicsPathTest.AddString_NegativeSize test fails

http://bugs.winehq.org/show_bug.cgi?id=30951

Bug #: 30951
           Summary: mono's GraphicsPathTest.AddString_NegativeSize test
                    fails
           Product: Wine
           Version: 1.5.4
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Keywords: download, regression, source, testcase
          Severity: normal
          Priority: P2
         Component: gdiplus
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
                CC: [e-mail]
    Classification: Unclassified
   Regression SHA1: 2c93bf7e4e469b36d3244f5a5f3c3c0ca0e0d897

This is a new failure that came up today when I ran the Mono System.Drawing
tests:

28) MonoTests.System.Drawing.Drawing2D.GraphicsPathTest.AddString_NegativeSize
: System.ArgumentException : A null reference or invalid value was found [GDI+
status: InvalidParameter]
at System.Drawing.GDIPlus.CheckStatus (Status status) [0x00000] in <filename
unknown>:0
at System.Drawing.Drawing2D.GraphicsPath.AddString (System.String s,
System.Drawing.FontFamily family, Int32 style, Single emSize, Rectangle
layoutRect, System.Drawing.StringFormat format) [0x00000] in <filename
unknown>:0
at System.Drawing.Drawing2D.GraphicsPath.AddString (System.String s,
System.Drawing.FontFamily family, Int32 style, Single emSize, Point origin,
System.Drawing.StringFormat format) [0x00000] in <filename unknown>:0
at (wrapper remoting-invoke-with-check)
System.Drawing.Drawing2D.GraphicsPath:AddString
(string,System.Drawing.FontFamily,int,single,System.Drawing.Point,System.Drawing.StringFormat)
at MonoTests.System.Drawing.Drawing2D.GraphicsPathTest.AddString_NegativeSize
() [0x00000] in <filename unknown>:0
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke
(System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags
invokeAttr, System.Reflection.Binder binder, System.Object[] parameters,
System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0

Here's the code for that test:

public void AddString_NegativeSize ()
        {
            GraphicsPath gp = new GraphicsPath ();
            FontFamily ff = GetFontFamily ();
            gp.AddString ("mono", ff, 0, -10, new Point (10, 10),
StringFormat.GenericDefault);
            Assert.IsTrue (gp.PointCount > 0, "PointCount");
        }

Bisecting gave me this:

2c93bf7e4e469b36d3244f5a5f3c3c0ca0e0d897 is the first bad commit
commit 2c93bf7e4e469b36d3244f5a5f3c3c0ca0e0d897
Author: Dmitry Timoshkov 
Date:   Fri May 11 19:19:21 2012 +0900

gdiplus: Retrieve LOGFONT from a GpFont using GdipGetLogFontW instead of
accessing it directly.

It seems it's valid to call GdipAddPathString with a negative font size. This
fails now because GdipCreateFont doesn't accept a negative font size, but I
don't know if it's correct for GdipAddPathString to call GdipCreateFont.

I can provide a compiled version of the System.Drawing tests if that would
help.