INFO: Tracking Brush Origins in a Win32-based Application

• Microsoft Win32 Application Programming Interface (API), used with:
  • Microsoft Windows NT, versions 3.1, 3.5, 3.51
  • Microsoft Windows versions 95, 4.0

SUMMARY

When writing to the Win32 API on Windows NT, it is no longer necessary to keep track of brush origins yourself. GDI32 keeps track of the brush origins by automatically recognizing when the origin has been changed. In Windows, you have to explicitly tell GDI to recognize the change by calling UnrealizeObject() with a handle to the brush. When a handle to a brush is passed to UnrealizeObject() in Windows NT, the function does nothing, therefore, it is still safe to call this API.

Win32s and Windows 95 require that you track the brush origins yourself, just as Windows 3.x does.

In Windows 3.1, the default brush origin is the screen origin. In Windows NT, the default origin is the client origin.

Additional query words: 3.10 4.00

Keywords          : kbNTOS310 kbNTOS350 kbNTOS351 kbSDKWin32 kbWinOS95 kbDSupport 
Version           : winnt:3.1,3.5,3.51
Platform          : winnt 
Issue type        : kbinfo 

Last Reviewed: July 14, 1999