Article View: comp.windows.ms.programmer
Article #592Re: WinApps detecting 24-bit Video Drivers
From: Chris GUZAK
Date: Tue, 06 Nov 1990 18:18
Date: Tue, 06 Nov 1990 18:18
17 lines
1100 bytes
1100 bytes
In article <599@nih-csl.nih.gov> bert@helix.nih.gov (Bert Tyler) writes: >How should a WinApp check for the presence of a 24-bit (IE, > 256 colors) >video driver? 24 bit and 16 bit displays will return -1 for NUMCOLORS (since GetDeviceCaps() only returns 16 bits. You can also check NUMPLANES * BITSPIXEL > 8 also indicates a > 256 color device. Palettes will be mapped to nearest colors on these devices so you will get what you expect. People should be careful with the returns from NUMPLANES and BITSPIXEL. Improper use of these parameters are almost always the cause of regular windows programs not running on 24 bit displays. Chris Guzak
Technical Details
Message-ID:
<58843@microsoft.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!microsoft!chrisgReferences:
<599@nih-csl.nih.gov>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!microsoft!chrisg From: chrisg@microsoft.UUCP (Chris GUZAK) Newsgroups: comp.windows.ms.programmer Subject: Re: WinApps detecting 24-bit Video Drivers Message-ID: <58843@microsoft.UUCP> Date: 6 Nov 90 18:18:59 GMT References: <599@nih-csl.nih.gov> Reply-To: chrisg@microsoft.UUCP (Chris GUZAK) Organization: Microsoft Corp., Redmond WA Lines: 17