diff options
| author | David Plowman <david.plowman@raspberrypi.com> | 2020-12-08 20:44:39 +0000 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2020-12-11 23:31:23 +0200 |
| commit | 1a6a7d4a8e2b26caad00d30283ace1f7d2478270 (patch) | |
| tree | 19d7e31a4c790e4e96e689468c4387d58fd1ae08 /src/ipa/raspberrypi/controller/pwl.hpp | |
| parent | dbcf4d82473936ce1cfaac0613fba99fb592c957 (diff) | |
ipa: raspberrypi: Compute inverse of piecewise linear function
Add a method to the piecewise linear function (Pwl) class to compute
the inverse of a given Pwl. If the input function is non-monotonic we
can only produce a best effort "pseudo" inverse, and we signal this to
the caller.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/ipa/raspberrypi/controller/pwl.hpp')
| -rw-r--r-- | src/ipa/raspberrypi/controller/pwl.hpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/controller/pwl.hpp b/src/ipa/raspberrypi/controller/pwl.hpp index 4f168551..484672f6 100644 --- a/src/ipa/raspberrypi/controller/pwl.hpp +++ b/src/ipa/raspberrypi/controller/pwl.hpp @@ -80,6 +80,9 @@ public: }; PerpType Invert(Point const &xy, Point &perp, int &span, const double eps = 1e-6) const; + // Compute the inverse function. Indicate if it is a proper (true) + // inverse, or only a best effort (e.g. input was non-monotonic). + Pwl Inverse(bool *true_inverse = nullptr, const double eps = 1e-6) const; // Compose two Pwls together, doing "this" first and "other" after. Pwl Compose(Pwl const &other, const double eps = 1e-6) const; // Apply function to (x,y) values at every control point. |