Get screenshot to exclude black cutout

    const sp<const DisplayDevice> device(getDisplayDeviceLocked(display));

    if (CC_UNLIKELY(device == 0)) return BAD_VALUE;

    const Rect& dispScissor = device->getScissor();

    if (!dispScissor.isEmpty()) {

        sourceCrop.set(dispScissor);

        // adb shell screencap will default reqWidth and reqHeight to zeros.

        if (reqWidth == 0 || reqHeight == 0) {

            reqWidth = uint32_t(dispScissor.width());

            reqHeight = uint32_t(dispScissor.height());

        }

    }

    DisplayRenderArea renderArea(device, sourceCrop, reqHeight, reqWidth, rotation);

    auto traverseLayers = std::bind(std::mem_fn(&SurfaceFlinger::traverseLayersInDisplay), this,