[参考译文] processor-SDK-J721E：app_display_module 中的 tivxNodeSendCommand

vx_status app_display_modify(vx_context context , vx_node node, tivx_display_params_t params)
{

    vx_status status = VX_SUCCESS;
    vx_reference refs[1];
    vx_user_data_object crop_obj = NULL;
    crop_obj =vxCreateUserDataObject(context, "tivx_display_crop_params_t", sizeof(tivx_display_crop_params_t), &params.cropPrms);
    
    vxCopyUserDataObject(crop_obj, 0,
                         sizeof(tivx_display_crop_params_t),
                         &params.cropPrms, VX_WRITE_ONLY, VX_MEMORY_TYPE_HOST);

    refs[0] = (vx_reference)crop_obj;

    status = VX_FAILURE;
    while (status == VX_FAILURE)
    {
        status = tivxNodeSendCommand(node, 0, TIVX_DISPLAY_SET_CROP_PARAMS,
                                     refs, 1u);
    }

    vxReleaseUserDataObject(&crop_obj);

    return status;
}

            case 'x':
                obj->stop_task = 1;
                done = 1;
                break;

            case 'r':
                obj->displayObj.disp_right_params.enableCropping = 1;
                obj->displayObj.disp_right_params.cropPrms.width += 100;
                app_display_modify(obj->context, obj->displayObj.disp_right_node, obj->displayObj.disp_right_params);

                printf("obj->displayObj.disp_right_params.cropPrms.width value is %d\n", obj->displayObj.disp_right_params.cropPrms.width);

                break;
            case 'l':
                obj->displayObj.disp_right_params.enableCropping = 1;
                obj->displayObj.disp_right_params.cropPrms.height += 100;
                app_display_modify(obj->context, obj->displayObj.disp_right_node, obj->displayObj.disp_right_params);

                printf("obj->displayObj.disp_right_params.cropPrms.height value is %d\n", obj->displayObj.disp_right_params.cropPrms.height);

                break;