minmax(3G) minmax(3G)
NAME
minmax - modifies pixel transfers to compute the minimum and maximum
pixel values
C SPECIFICATION
void minmax(unsigned long op, unsigned long value)
PARAMETERS
op one of the symbolic constants:
(parameters that affect lrectread, lrectwrite, rectcopy pixel
transfers)
MINMAX_ENABLE enables the computaton of minimum and maximum pixels
in lrectread, lrectwrite and rectcopy pixel transfers. Value is
ignored.
MINMAX_DISABLE disables the collection of minmax data.
MINMAX_INIT initializes the minmax data.
value
is ignored.
DESCRIPTION
gl_minmax allows enabling and disabling of collection of minmax data on a
per component basis during pixel transfer operations (e.g., rectcopy,
lrectread, and lrectwrite). When minmax is enabled, the destination of
the pixel transfer is unaffected. Enabling or disabling minmax do not
reset previously accumulated minmax values, instead, the minmax values
are initialized by MINMAX_INIT by setting the minimum to positive
infinity and maximum by negative infinity.
SEE ALSO
gethistogram histogram getminmax pixeltransfer pixelmap pixmode
NOTES
minmax only works on RealityEngine systems running 5.0.1 or greater.
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