diff options
| -rw-r--r-- | camera/CameraParameters.cpp | 2 | ||||
| -rw-r--r-- | include/camera/CameraParameters.h | 38 |
2 files changed, 40 insertions, 0 deletions
diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp index 1e7abae..214cd4d 100644 --- a/camera/CameraParameters.cpp +++ b/camera/CameraParameters.cpp @@ -68,6 +68,8 @@ const char CameraParameters::KEY_EXPOSURE_COMPENSATION[] = "exposure-compensatio const char CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION[] = "max-exposure-compensation"; const char CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION[] = "min-exposure-compensation"; const char CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP[] = "exposure-compensation-step"; +const char CameraParameters::KEY_MAX_NUM_METERING_AREAS[] = "max-num-metering-areas"; +const char CameraParameters::KEY_METERING_AREAS[] = "metering-areas"; const char CameraParameters::KEY_ZOOM[] = "zoom"; const char CameraParameters::KEY_MAX_ZOOM[] = "max-zoom"; const char CameraParameters::KEY_ZOOM_RATIOS[] = "zoom-ratios"; diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h index 7930f47..e272839 100644 --- a/include/camera/CameraParameters.h +++ b/include/camera/CameraParameters.h @@ -308,6 +308,44 @@ public: // 0.3333, EV is -2. // Example value: "0.333333333" or "0.5". Read only. static const char KEY_EXPOSURE_COMPENSATION_STEP[]; + // The maximum number of metering areas supported. This is the maximum + // length of KEY_METERING_AREAS. + // Example value: "0" or "2". Read only. + static const char KEY_MAX_NUM_METERING_AREAS[]; + // Current metering areas. Camera driver uses these areas to decide + // exposure. + // + // Before accessing this parameter, apps should check + // KEY_MAX_NUM_METERING_AREAS first to know the maximum number of metering + // areas first. If the value is 0, metering area is not supported. + // + // Each metering area is a rectangle with specified weight. The direction is + // relative to the sensor orientation, that is, what the sensor sees. The + // direction is not affected by the rotation or mirroring of + // CAMERA_CMD_SET_DISPLAY_ORIENTATION. Coordinates of the rectangle range + // from -1000 to 1000. (-1000, -1000) is the upper left point. (1000, 1000) + // is the lower right point. The length and width of metering areas cannot + // be 0 or negative. + // + // The weight ranges from 1 to 1000. The sum of the weights of all metering + // areas must be 1000. Metering areas can partially overlap and the driver + // will add the weights in the overlap region. But apps should not set two + // metering areas that have identical coordinates. + // + // A special case of all-zero single metering area means driver to decide + // the metering area. For example, the driver may use more signals to decide + // metering areas and change them dynamically. Apps can set all-zero if they + // want the driver to decide metering areas. + // + // Metering areas are relative to the current field of view (KEY_ZOOM). + // No matter what the zoom level is, (-1000,-1000) represents the top of the + // currently visible camera frame. The metering area cannot be set to be + // outside the current field of view, even when using zoom. + // + // No matter what metering areas are, the final exposure are compensated + // by KEY_EXPOSURE_COMPENSATION. + // Example value: "(-10,-10,0,0,300),(0,0,10,10,700)". Read/write. + static const char KEY_METERING_AREAS[]; // Current zoom value. // Example value: "0" or "6". Read/write. static const char KEY_ZOOM[]; |