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Test: comparison of code to formula
Change-Id: Ie7c8b3a2a6bc64ea3c837a6674b55c07fe49e12b
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Somehow the change at
https://android-review.googlesource.com/#/c/109481/1/core/java/android/util/Spline.java
isn't in master, which seems to be causing a boot failure.
07-28 07:44:51.338 771 771 E art : No implementation found for float android.util.FloatMath.hypot(float, float) (tried Java_android_util_FloatMath_hypot and Java_android_util_FloatMath_hypot__FF)
07-28 07:44:51.338 771 771 W SystemServer: ***********************************************
07-28 07:44:51.339 771 771 F SystemServer: BOOT FAILURE making Power Manager Service ready
07-28 07:44:51.339 771 771 F SystemServer: java.lang.UnsatisfiedLinkError: No implementation found for float android.util.FloatMath.hypot(float, float) (tried Java_android_util_FloatMath_hypot and Java_android_util_FloatMath_hypot__FF)
07-28 07:44:51.339 771 771 F SystemServer: at android.util.FloatMath.hypot(Native Method)
07-28 07:44:51.339 771 771 F SystemServer: at android.util.Spline$MonotoneCubicSpline.<init>(Spline.java:168)
07-28 07:44:51.339 771 771 F SystemServer: at android.util.Spline.createMonotoneCubicSpline(Spline.java:72)
07-28 07:44:51.339 771 771 F SystemServer: at android.util.Spline.createSpline(Spline.java:47)
07-28 07:44:51.339 771 771 F SystemServer: at com.android.server.display.DisplayPowerController.createAutoBrightnessSpline(DisplayPowerController.java:1100)
Change-Id: Ic6a85d4f9125b921fa4f307e9d5723c09104ca4d
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Some devices may contain things like transflective displays where
they actually want the backlight brightness to decrease in the face
of high ambient light scenarios. In the interest of time, just use a
linear interpolation based on the brightness control points for these
cases but in the future we should consider adding a non-monotonic
cubic spline.
Bug: 15611140
Change-Id: I8fcee061b18c8ae9cc9a1b38d8b850aaec4478ce
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Strictly speaking, this is a change in behavior for all products.
Instead of using discrete zones, they will all now use spline
interpolation. We could make this behavior configurable
but there seems to be little point to it. The range of brightness
values used will be more or less the same as before, it's just
that what used to be the brightness value for all levels within
a particular zone now becomes the brightness value for the
highest level in that zone and lower values are used for lower
levels within the zone.
Change-Id: I39804ee630ba55f018e1e53c0576b28e7bd27931
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