Clamp to uint8 for alpha

    return -1;

}

static uint8_t to_uint8(float value) {

    int c = (int) (value + .5f);

    return static_cast<uint8_t>( c < 0 ? 0 : c > 255 ? 255 : c );

}

void CanvasPropertyPaintAnimator::setValue(float value) {

    switch (mField) {

    case STROKE_WIDTH:

        mProperty->value.setStrokeWidth(value);

        return;

    case ALPHA:

        mProperty->value.setAlpha(value);

        mProperty->value.setAlpha(to_uint8(value));

        return;

    }

    LOG_ALWAYS_FATAL("Unknown field %d", (int) mField);