[Mono-bugs] [Bug 449971] New: MeasureCharacterRanges treats empty layout rectangle incorrectly

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=449971


           Summary: MeasureCharacterRanges treats empty layout rectangle
                    incorrectly
           Product: Mono: Class Libraries
           Version: 1.9
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Drawing.
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: stapostol at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=256444)
 --> (https://bugzilla.novell.com/attachment.cgi?id=256444)
Test case

Description of Problem:

When MeasureCharacterRanges is passed an empty layout rectangle
(RectangleF.Empty), it produces incorrect results for the text layout.

Attached is a test case that demonstrates the issue (runs fine under .Net).


Steps to reproduce the problem:
1. Compile the test case with "gmcs Program.cs -r:System.Drawing.dll".
2. Run and compare the output between MeasureCharacterRanges with
RectangleF.Empty and new RectangleF(0, 0, 100, 100).


Actual Results:
Using rectangle {X=0,Y=0,Width=100,Height=100}:
{X=0,Y=0,Width=9,Height=18}
{X=9,Y=0,Width=9,Height=18}
{X=18,Y=0,Width=8,Height=18}

Using rectangle {X=0,Y=0,Width=0,Height=0}:
{X=-4194304,Y=-4194304,Width=8388608,Height=8388608}
{X=-4194304,Y=-4194304,Width=8388608,Height=8388608}
{X=-4194304,Y=-4194304,Width=8388608,Height=8388608}



Expected Results:
Using rectangle {X=0,Y=0,Width=100,Height=100}:
{X=0,Y=0,Width=9,Height=18}
{X=9,Y=0,Width=9,Height=18}
{X=18,Y=0,Width=8,Height=18}

Using rectangle {X=0,Y=0,Width=0,Height=0}:
{X=0,Y=0,Width=9,Height=18}
{X=9,Y=0,Width=9,Height=18}
{X=18,Y=0,Width=8,Height=18}



How often does this happen? 
Always.


Additional Information:
The same program works correctly on .Net. Please note that your actual results
may differ slightly according to your installed fonts.


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