xrandr: Changes to 'master'

[Aaron Plattner]

 xrandr.c |   63 ++++++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 48 insertions(+), 15 deletions(-)

New commits:
commit b501dd3adfac13e15e619898d4447d83b8301dd3
Author: Andy Ritger <aritger at nvidia.com>
Date:   Fri Aug 24 15:53:09 2012 -0700

    xrandr: compute gamma-correction in [0,2^sigbits)
    
    The gamma-correction lookup table values are 16:16:16 X Colors, where the
    MSBs are programmed into the hardware lookup table.  Rather than compute
    values over the entire range [0,65536) (where values below 2^(16 - sigbits)
    will receive the same hardware value), compute values over the range
    [0,2^sigbits) and left shift by (16 - sigbits) into the MSBs.
    
    Signed-off-by: Andy Ritger <aritger at nvidia.com>
    Reviewed-by: Aaron Plattner <aplattner at nvidia.com>
    Signed-off-by: Aaron Plattner <aplattner at nvidia.com>

commit 90afd01788be7bf19e441a59dca0d8057c5267b1
Author: Andy Ritger <aritger at nvidia.com>
Date:   Fri Aug 24 15:53:08 2012 -0700

    xrandr: fix gamma == 1.0 && sigbits != 8
    
    The gamma-correction lookup table managed through XRR[GS]etCrtcGamma is
    2^n in size, where 'n' is the number of significant bits in the X Color.
    Each element in the gamma-correction lookup table is a 16:16:16 X Color
    (i.e., in the range [0,65536) ).  The significant bits of each component
    of each element in the lookup table are programmed into the hardware
    lookup table.  Meaningful values in the gamma-correction lookup table
    are thus in the range [0,2^sigbits), where all values are shifted into
    the MSBs (i.e., left shifted by (16 - sigificant bits)).
    
    Signed-off-by: Andy Ritger <aritger at nvidia.com>
    Reviewed-by: Aaron Plattner <aplattner at nvidia.com>
    Signed-off-by: Aaron Plattner <aplattner at nvidia.com>

commit 6bf48ae8d8db58ab74182383e54332f120f024c2
Author: Andy Ritger <aritger at nvidia.com>
Date:   Fri Aug 24 15:53:07 2012 -0700

    xrandr: use 1/gamma to compute gamma-correction
    
    To compute a gamma *correction* lookup table, use the specified gamma
    value as the divisor in (1.0/gamma).  This matches the semantics of
    xgamma(1) and the "gamma-value" and "{red,green,blue}-gamma" xorg.conf(5)
    options.
    
    For more details, see:
    http://www.poynton.com/PDFs/TIDV/Gamma.pdf (Gamma in computer graphics, page 17)
    http://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/common/xf86cmap.c:ComputeGamma()
    
    Signed-off-by: Andy Ritger <aritger at nvidia.com>
    Reviewed-by: Aaron Plattner <aplattner at nvidia.com>
    Signed-off-by: Aaron Plattner <aplattner at nvidia.com>