Querying Device Support for MaskBlt

Last reviewed: November 2, 1995
Article ID: Q108929
The information in this article applies to:
  • Microsoft Win32 Application Programming Interface (API) included with:

        - Microsoft Windows NT versions 3.1, 3.5, and 3.51
    

The Win32 documentation for MaskBlt() states:

   Not all devices support the MaskBlt function. An application should call
   the GetDeviceCaps function to determine whether a device supports this
   function.

To query support for MaskBlt(), an application should query the device for BitBlt support by passing RC_BITBLT constant to GetDeviceCaps().

MaskBlt() implements transparent blts in Windows NT. For more information, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q89375
   TITLE     : Transparent Blts in Windows NT

GDI implements this application programming interface (API) by calling BitBlt(). Because BitBlt() is implemented at the driver level, applications that calls MaskBlt() should check for BitBlt() support on the device.


Additional reference words: 3.10 3.50
KBCategory: kbgraphic
KBSubcategory: GdiBmp


THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: November 2, 1995
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.