The SetPixel function fails in specific x-coordinates if Windows Aero is not running on a computer that is running Windows Vista SP1 or Windows Server 2008

Consider the following scenario. You use an application that calls the SetPixel function on a computer that is running Windows Vista Service Pack 1 (SP1) or Windows Server 2008. This function sets a pixel at specified coordinates to a specified color. In this scenario, the SetPixel function fails in specific ranges of x-coordinates. Therefore, the application experiences display issues.

When this issue occurs, the first 255 pixels (0-255) on the x-axis display correctly. However, the next 255 pixels (256-511) on the x-axis do not display. The following 255 pixels (768-1023) display correctly. This pattern repeats across x-axis of the screen.

For example, you use an application that calls the SetPixel function to draw a red horizontal line. The y-coordinate of the horizontal line is 300, and the range of the x-coordinate is from 0 to 768. In this example, the horizontal line is missing in the range of x-coordinates that is between 256 and 511. Therefore, the horizontal line is divided into two parts and is not displayed correctly.

This issue occurs under one of the following conditions:

• The computer is running a Windows Vista SP1 operating system that does not support the Windows Aero feature. For example, the computer is running Windows Vista Home Basic.
• The computer is running a Windows Vista SP1 operating system that supports the Windows Aero feature. However, the feature is manually turned off. This feature may be manually turned off if you select a color scheme that does not support Windows Aero. For example, you select the Windows Vista Basic color scheme.
• The computer has a graphic adapter that does not support the Windows Aero feature.

Notes

• Windows Aero is the desktop experience that is available to computers that use a compatible graphics adapter and are running Windows Vista Home Premium, Windows Vista Business, Windows Vista Ultimate, or Windows Vista Enterprise.
• This issue does not occur on a Virtual PC that is running Windows Vista.

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.

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, submit a request to 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

To apply this hotfix, you must be running one of the following operating systems:

• Windows Vista Service Pack 1 (SP1)
• Windows Server 2008

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

• The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

  Version	Product	SR_Level	Service branch
  6.0.600 1 . 22xxx	Windows Vista and Windows Server 2008	SP1	LDR

• Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

For all supported IA-64-based versions of Windows Server 2008

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about Windows Aero, visit the following Microsoft website:For more information about how to troubleshoot problems with Windows Aero, visit the following Microsoft website:For more information about the SetPixel function, visit the following Microsoft Developer Network (MSDN) website: For more information about this issue that occurs in Windows Vista Service Pack 2 (SP2), click the following article number to view the article in the Microsoft Knowledge Base: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

Additional files for all supported IA-64-based versions of Windows Server 2008