nanogui: TRUECOLOR 565
Subject:
Re: [nanogui] TRUECOLOR 565
From:
"Greg Haerr" ####@####.####
Date:
30 Sep 2005 21:37:04 +0100
Message-Id: <12c901c5c5fe$7ef5f320$0300a8c0@RDP>
: My question is when using MWRGB with a TRUECOLOR 565
: setting should I just use the top 5 or 6 bits of the
: color byte?
Yes, you'll have to, since the bottom 2 or 3 bits don't matter.
Inspection of the macros will show that the RGB color
values are shifted right 2 or 3 bits.
: How do I get one shade darker or lighter?
Well, for the 5 bit, you'll step through the G values
in increments of 8-5 = 3 which is 2^3 = 8. For
the R & B values you'll step through in increments
of 8-6=2, 2^2 = 4. Try double or triple increments
in the beginning, your monitor might not display the
differences when small, it seems.
Regards,
Greg
:
:
: --- Greg Haerr ####@####.#### wrote:
:
: > : The system I am working on uses TRUECOLOR565. Is
: > there
: > : a good way that I can directly change the RGB
: > values.
: > : MWRGB Produces some strange effects. I am trying
: > to
: > : smoothly shade a bar.
: >
: > Use the GrOpenClientFramebuffer() api, which will
: > allow
: > you to call GrGetWindowFBInfo to find the
: > memory-mapped
: > address of the current window positions'
: > user-drawable
: > window area. Then, just draw at that address...
: >
: > This routine was added for applications that needed
: > fast,
: > direct access to window interiors, like mpeg
: > players.
: >
: > Regards,
: >
: > Greg
: >
: >
:
:
:
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