singer@endor.UUCP (10/04/87)
How does one tell how many bits per pixel are set in the Control Panel? I know that it's possible, because I see demos that refuse to run unless 8 bits per pixel (256 colors) are set up -- they display a message saying "8 bits per pixel required" if it isn't set up. I assume I'm missing something from IM 5; can anyone set me straight? --Rich **The opinions stated herein are my own opinions and do not necessarily represent the policies or opinions of my employer (THINK Technologies, Inc). * Richard M. Siegel | {decvax, ucbvax, sun}!harvard!endor!singer * * Customer Support | singer@endor.harvard.edu * * THINK Technologies, Inc. (No snappy quote) *
fry@huma1.UUCP (10/04/87)
In article <2927@husc6.UUCP> singer@endor.UUCP (Richard Siegel) writes: >How does one tell how many bits per pixel are set in the Control Panel? >I know that it's possible, because I see demos that refuse to run >unless 8 bits per pixel (256 colors) are set up -- they display a >message saying "8 bits per pixel required" if it isn't set up. Let screenRect be a rectangle that defines the area you want to know the pixel depth of. If you only have one monitor attached then screenRect can be screenBits.bounds, but you may want to be more specific for multiple monitors. If you just want to know the greatest depth of any monitor attached (which is the normal thing to do) let screenRect be the rectangle enclosing the GrayRgn, the desktop even for multiple screen setups. Once you've got screenRect figured out, call maxdev = GetMaxDevice(&screenRect); /* returns gDevice handle of deepest device */ and then theDepth = (**((**maxdev).gdPMap)).pixelSize; will give you the bits per pixel of that screen.
jww@sdcsvax.UCSD.EDU (Joel West) (10/04/87)
Well, in any PixMap (including global screen) there is a pixelSize value, which is 1,2,4 or 8. If you want to get an exact answer, you have to check each display, which are represented by gDevice's, each of which has a PixMap. -- Joel West (c/o UCSD) Palomar Software, Inc., P.O. Box 2635, Vista, CA 92083 {ucbvax,ihnp4}!sdcsvax!jww jww@sdcsvax.ucsd.edu or ihnp4!crash!palomar!joel joel@palomar.cts.com
stew@endor.harvard.edu (Stew Rubenstein) (10/04/87)
In article <2927@husc6.UUCP> singer@endor.UUCP (Richard Siegel) writes: >How does one tell how many bits per pixel are set in the Control Panel? >I know that it's possible, because I see demos that refuse to run >unless 8 bits per pixel (256 colors) are set up -- they display a >message saying "8 bits per pixel required" if it isn't set up. > >I assume I'm missing something from IM 5; can anyone set me straight? > > --Rich Look at the routine GetMaxDevice, on page 37 of the March APDA draft IM V. You can also look at the pixelSize field in the PixMap for a CGrafPort or GDevice. Stew Rubenstein Cambridge Scientific Computing, Inc. UUCPnet: seismo!harvard!rubenstein CompuServe: 76525,421 Internet: rubenstein@harvard.harvard.edu MCIMail: CSC