FIX: The right edge or the lower edge of an exclusionary clipping region can be drawn in a GDI+ application on a computer that is running Windows XP, Windows Server 2003, or Windows Vista

On a computer that is running Microsoft Windows XP, Microsoft Windows Server 2003, or Windows Vista, you use an exclusionary clipping region in a Graphics Device Interface (GDI+) application. In the application, the right edge or the lower edge of the region can be drawn. However, you expect that these edges cannot be drawn.

This problem occurs if the following conditions are true:

• The Pen class has an alpha component
• The value of the alpha component is less than 255.

This problem does not occur when the value of the alpha component is 255.

Note An exclusionary clipping region is a region that cannot be drawn. You can only draw in the area that is outside this region.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

You must have one of the following operating systems installed to apply this hotfix:

• Microsoft Windows XP Service Pack 2 (SP2)
• Windows Server 2003 Service Pack 2 (SP2)
• Windows Server 2003 Service Pack 1 (SP1)
• Windows Vista

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Microsoft Windows XP Service Pack 2

Microsoft Windows Server 2003 Service Pack 1, x86-based versions

Microsoft Windows Server 2003 Service Pack 1, x64-based versions

Microsoft Windows Server 2003 Service Pack 1, Itanium-based versions

Microsoft Windows Server 2003 Service Pack 2, x86-based versions

Microsoft Windows Server 2003 Service Pack 2, x64-based versions

Microsoft Windows Server 2003 Service Pack 2, Itanium-based versions

Windows Vista, x86-based versions

Windows Vista, x64-based versions

To work around this problem, set the value of the Graphics.SmoothingMode property to AntiAlias.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: