Merge "Clarify the meaning of weight in the focus and metering area HAL."

    // (-1000,-1000) is the upper left point. (1000, 1000) is the lower right

    // point. The length and width of focus areas cannot be 0 or negative.

    //

    // The fifth element is the weight. The weight ranges from 1 to 1000.

    // The sum of the weights of all focus areas must be 1000. Focus areas

    // can partially overlap and the driver will add the weights in the

    // overlap region. But apps should not set two focus areas that have

    // identical coordinates.

    // The fifth element is the weight. Values for weight must range from 1 to

    // 1000.  The weight should be interpreted as a per-pixel weight - all

    // pixels in the area have the specified weight. This means a small area

    // with the same weight as a larger area will have less influence on the

    // focusing than the larger area. Focus areas can partially overlap and the

    // driver will add the weights in the overlap region.

    //

    // A special case of single focus area (0,0,0,0,0) means driver to decide

    // the focus area. For example, the driver may use more signals to decide

    // 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.

    // The fifth element is the weight. Values for weight must range from 1 to

    // 1000.  The weight should be interpreted as a per-pixel weight - all

    // pixels in the area have the specified weight. This means a small area

    // with the same weight as a larger area will have less influence on the

    // metering than the larger area. Metering areas can partially overlap and

    // the driver will add the weights in the overlap region.

    //

    // 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