Re: Contrast in 2-bit gray mode on IIIx's

[Stephen Best]

> So the question is this. Is there something I can do about this annoying
> contrast issue? Is there an API to set it? I know I can bring up the
> slider on the V, but I don't think there's an API to set it in OS 3.x in
> general, correct?

This is the code I use (you'll need the OS 3.1 headers):

Stephen Best
Bitware Australia
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      // Get features by OS version

FtrGet (sysFtrCreator, sysFtrNumROMVersion, &romVersion);

supportGrayscale = ( romVersion >= 0x03000000 ? true : false );
supportContrast  = ( romVersion >= 0x03100000 ? true : false );

      // Turn grayscale on

if ( supportGrayscale )
   {
   if ( supportContrast )
      contrastSave = SysLCDContrast (false, 0);

   setGrayscale = false;

   ScrDisplayMode (scrDisplayModeGet, NULL, NULL, &depth, NULL);

   if ( depth < 2 )
      {
      depth = 2;

      if ( !ScrDisplayMode (scrDisplayModeSet, NULL, NULL, &depth, NULL) )
         setGrayscale = true;
      }

   if ( supportContrast )
      SysLCDContrast (true, contrastSave);
   }

      // Turn grayscale off

if ( supportGrayscale )
   {
   if ( setGrayscale )
      ScrDisplayMode (scrDisplayModeSetToDefaults, NULL, NULL, NULL, NULL);

   if ( supportContrast )
      SysLCDContrast (true, contrastSave);
   }