Add an auto-exposure lock feature to the Camera API.
Adds a new camera parameter for locking auto-exposure to its current
value. Also adds a function for checking if auto-exposure lock is
supported by the current platform.
Hidden for now.
Change-Id: Id452371191ab220318ce2cb98b8ee91bdde9aab6
diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h
index db81721..513239f 100644
--- a/include/camera/CameraParameters.h
+++ b/include/camera/CameraParameters.h
@@ -309,6 +309,25 @@
// 0.3333, EV is -2.
// Example value: "0.333333333" or "0.5". Read only.
static const char KEY_EXPOSURE_COMPENSATION_STEP[];
+ // The state of the auto-exposure lock. "true" means that auto-exposure is
+ // locked to its current value and will not change. "false" means the
+ // auto-exposure routine is free to change exposure settings. Changing
+ // exposure compensation settings will still affect the exposure settings
+ // while auto-exposure is locked. Stopping preview or taking a still image
+ // will release the lock. However, the lock can be re-enabled prior to
+ // preview being re-started, to keep the exposure values from the previous
+ // lock. In conjunction with exposure compensation, this allows for
+ // capturing multi-exposure brackets with known relative exposure
+ // values. Locking auto-exposure after open but before the first cal to
+ // startPreview may result in severly over- or under-exposed images. The
+ // driver may independently enable the AE lock after auto-focus
+ // completes. If it does so, this key must have its value updated to reflect
+ // the lock's existence. Applications are free to release such a lock, to
+ // re-enable AE without restarting preview.
+ static const char KEY_AUTO_EXPOSURE_LOCK[];
+ // Whether locking the auto-exposure is supported. "true" means it is, and
+ // "false" or this key not existing means it is not supported.
+ static const char KEY_AUTO_EXPOSURE_LOCK_SUPPORTED[];
// The maximum number of metering areas supported. This is the maximum
// length of KEY_METERING_AREAS.
// Example value: "0" or "2". Read only.
@@ -428,6 +447,7 @@
// Value for KEY_ZOOM_SUPPORTED or KEY_SMOOTH_ZOOM_SUPPORTED.
static const char TRUE[];
+ static const char FALSE[];
// Value for KEY_FOCUS_DISTANCES.
static const char FOCUS_DISTANCE_INFINITY[];