[Mono-bugs] [Bug 492299] New: Graphics.Clear(Color) doesn't work on clipped Graphics

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun Apr 5 15:50:55 EDT 2009


           Summary: Graphics.Clear(Color) doesn't work on clipped Graphics
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: All
        OS/Version: openSUSE 11.1
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: libgdiplus
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: stifu at free.fr
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

Created an attachment (id=284151)
 --> (http://bugzilla.novell.com/attachment.cgi?id=284151)
Test case

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
rv:1.9.1b4pre) Gecko/20090405 Shiretoko/3.5b4pre (.NET CLR 3.5.30729)

See test case.

We have a panel, we define a region to be excluded from the painting, then we
clear the graphics with black. It should result in a black rectangle, in which
there is a smaller gray rectangle (the part we excluded by setting the clip

With Mono, it doesn't work. The Graphics.Clear() does nothing at all, so we
only see the gray panel, with no black on it. Also, even though it does
nothing, it is extremely slow.

Here are the results for calling the paint function of the test case 100 times,
on my computer:

NET on Windows: 0 second
Mono on openSUSE: over 5 seconds

Reproducible: Always

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