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Merge "Allow the dim brightness to be brighter than the minimum." into jb-mr1-dev

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This commit is contained in:
Jeff Brown
2012-10-06 22:53:40 -07:00
committed by Android (Google) Code Review
parent 2ec390d1ea b76eebff47
commit 140cdb7a5d
1 changed files with 63 additions and 20 deletions
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83
services/java/com/android/server/power/DisplayPowerController.java
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@@ -89,6 +89,9 @@ final class DisplayPowerController {
// auto-brightness adjustment setting.
private static final float SCREEN_AUTO_BRIGHTNESS_ADJUSTMENT_MAX_GAMMA = 3.0f;
// The minimum reduction in brightness when dimmed.
private static final int SCREEN_DIM_MINIMUM_REDUCTION = 10;
// If true, enables the use of the current time as an auto-brightness adjustment.
// The basic idea here is to expand the dynamic range of auto-brightness
// when it is especially dark outside. The light sensor tends to perform
@@ -185,6 +188,12 @@ final class DisplayPowerController {
// The dim screen brightness.
private final int mScreenBrightnessDimConfig;
// The minimum allowed brightness.
private final int mScreenBrightnessRangeMinimum;
// The maximum allowed brightness.
private final int mScreenBrightnessRangeMaximum;
// True if auto-brightness should be used.
private boolean mUseSoftwareAutoBrightnessConfig;
@@ -343,8 +352,14 @@ final class DisplayPowerController {
mDisplayManager = (DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);
final Resources resources = context.getResources();
mScreenBrightnessDimConfig = resources.getInteger(
com.android.internal.R.integer.config_screenBrightnessDim);
mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger(
com.android.internal.R.integer.config_screenBrightnessDim));
int screenBrightnessMinimum = Math.min(resources.getInteger(
com.android.internal.R.integer.config_screenBrightnessSettingMinimum),
mScreenBrightnessDimConfig);
mUseSoftwareAutoBrightnessConfig = resources.getBoolean(
com.android.internal.R.bool.config_automatic_brightness_available);
if (mUseSoftwareAutoBrightnessConfig) {
@@ -362,12 +377,19 @@ final class DisplayPowerController {
+ "which must be strictly increasing. "
+ "Auto-brightness will be disabled.");
mUseSoftwareAutoBrightnessConfig = false;
} else {
if (screenBrightness[0] < screenBrightnessMinimum) {
screenBrightnessMinimum = screenBrightness[0];
}
}
mLightSensorWarmUpTimeConfig = resources.getInteger(
com.android.internal.R.integer.config_lightSensorWarmupTime);
}
mScreenBrightnessRangeMinimum = clampAbsoluteBrightness(screenBrightnessMinimum);
mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON;
mElectronBeamAnimatesBacklightConfig = resources.getBoolean(
com.android.internal.R.bool.config_animateScreenLights);
@@ -394,14 +416,14 @@ final class DisplayPowerController {
final int n = brightness.length;
float[] x = new float[n];
float[] y = new float[n];
y[0] = (float)brightness[0] / PowerManager.BRIGHTNESS_ON;
y[0] = normalizeAbsoluteBrightness(brightness[0]);
for (int i = 1; i < n; i++) {
x[i] = lux[i - 1];
y[i] = (float)brightness[i] / PowerManager.BRIGHTNESS_ON;
y[i] = normalizeAbsoluteBrightness(brightness[i]);
}
Spline spline = Spline.createMonotoneCubicSpline(x, y);
if (false) {
if (DEBUG) {
Slog.d(TAG, "Auto-brightness spline: " + spline);
for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) {
Slog.d(TAG, String.format(" %7.1f: %7.1f", v, spline.interpolate(v)));
@@ -602,30 +624,31 @@ final class DisplayPowerController {
}
// Set the screen brightness.
if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM) {
// Screen is dimmed. Overrides everything else.
animateScreenBrightness(
clampScreenBrightness(mScreenBrightnessDimConfig),
BRIGHTNESS_RAMP_RATE_FAST);
mUsingScreenAutoBrightness = false;
} else if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_BRIGHT) {
if (wantScreenOn(mPowerRequest.screenState)) {
int target;
boolean slow;
if (mScreenAutoBrightness >= 0 && mLightSensorEnabled) {
// Use current auto-brightness value.
animateScreenBrightness(
clampScreenBrightness(mScreenAutoBrightness),
mUsingScreenAutoBrightness ? BRIGHTNESS_RAMP_RATE_SLOW :
BRIGHTNESS_RAMP_RATE_FAST);
target = mScreenAutoBrightness;
slow = mUsingScreenAutoBrightness;
mUsingScreenAutoBrightness = true;
} else {
// Light sensor is disabled or not ready yet.
// Use the current brightness setting from the request, which is expected
// provide a nominal default value for the case where auto-brightness
// is not ready yet.
animateScreenBrightness(
clampScreenBrightness(mPowerRequest.screenBrightness),
BRIGHTNESS_RAMP_RATE_FAST);
target = mPowerRequest.screenBrightness;
slow = false;
mUsingScreenAutoBrightness = false;
}
if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM) {
// Screen is dimmed. Sets an upper bound on everything else.
target = Math.min(target - SCREEN_DIM_MINIMUM_REDUCTION,
mScreenBrightnessDimConfig);
slow = false;
}
animateScreenBrightness(clampScreenBrightness(target),
slow ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST);
} else {
// Screen is off. Don't bother changing the brightness.
mUsingScreenAutoBrightness = false;
@@ -729,7 +752,25 @@ final class DisplayPowerController {
}
private int clampScreenBrightness(int value) {
return Math.min(Math.max(Math.max(value, mScreenBrightnessDimConfig), 0), 255);
return clamp(value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum);
}
private static int clampAbsoluteBrightness(int value) {
return clamp(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON);
}
private static int clamp(int value, int min, int max) {
if (value <= min) {
return min;
}
if (value >= max) {
return max;
}
return value;
}
private static float normalizeAbsoluteBrightness(int value) {
return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON;
}
private void animateScreenBrightness(int target, int rate) {
@@ -1055,6 +1096,8 @@ final class DisplayPowerController {
pw.println();
pw.println("Display Controller Configuration:");
pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig);
pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum);
pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum);
pw.println(" mUseSoftwareAutoBrightnessConfig="
+ mUseSoftwareAutoBrightnessConfig);
pw.println(" mScreenAutoBrightnessSpline=" + mScreenAutoBrightnessSpline);